Recent Publications

Weekly Highlighted Publication

Multiple meltwater discharge and ice rafting events recorded in the deglacial sediments along the Beaufort Margin, Arctic Ocean

Impact:
Thick, acoustically transparent Holocene sediment imaged from Barrow Canyon to the Mackenzie Trough indicates that discharge down Barrow Canyon and sediment from the Alaskan continent were important sources during this time period, possibly due to rivers reworking glacial sediment exposed by the retreat of glacier ice on the Brooks Range. Acoustically laminated sediments with coarser grain size and higher magnetic susceptibility underlie the Holocene unit. The acoustic reflectivity and thickness of this unit increases towards the Mackenzie Trough, suggesting that it is the main source of the acoustically laminated sediment, in addition to ice-rafted debris (IRD) from the Amundsen and M'Clure ice streams.

Search Recent Publications

  • Hildebrand JA, Frasier K.E, Baumann-Pickering S., Wiggins SM, Merkens K.P, Garrison L.P, Soklevilla M.S, McDonald M.A.  2019.  Assessing seasonality and density from passive acoustic monitoring of signals presumed to be from pygmy and dwarf sperm whales in the Gulf of Mexico. Frontiers in Marine Science. 6
    Abstract Summary:

    Pygmy sperm whales (Kogia breviceps) and dwarf sperm whales (Kogia sima) are deep diving cetaceans that commonly strand along the coast of the southeast US, but that are difficult to study visually at sea because of their elusive behavior. Conventional visual surveys are thought to significantly underestimate the presence of Kogia and they have proven difficult to approach for tracking and tagging. An approach is presented for density...

  • Dayton PK, Oliver JS, Thrush S.F, Hammerstrom K.  2019.  Bacteria defend carrion from scavengers. Antarctic Science. 31:13-15.
    Abstract Summary:

    Carrion in the form of dead seal pups and algal mats placed on soft bottom habitats at Explorers Cove and Salmon Bay, McMurdo Sound, attract scavenging invertebrates that are driven away by hydrogen sulphide produced by sulphate-reducing bacteria sequestered below a layer of Beggiatoa/Thioploca-like filamentous bacteria. This system is usually found for lipid-rich marine mammal carrion, but also occurred with natural algal mats.


  • Chen S.J, Russell LM, Cappa CD, Zhang X.L, Kleeman M.J, Kumar A., Liu D., Ramanathana V..  2019.  Comparing black and brown carbon absorption from AERONET and surface measurements at wintertime Fresno. Atmospheric Environment. 199:164-176.
    Abstract Summary:

    The radiative impacts of black carbon (BC) and brown carbon (BrC) are widely recognized but remain highly uncertain. The Aerosol Robotic Network (AERONET) provides measurements of aerosol optical depth (AOD), aerosol absorption optical depth (AAOD), and other parameters. AERONET AAOD measurements have been used to estimate the relative contributions of BC and BrC to the total absorption at select sites and have the potential to be used across...

  • Eisenhofer R., Minich J.J, Marotz C., Cooper A., Knight R., Weyrich L.S.  2019.  Contamination in low microbial biomass microbiome studies: Issues and recommendations. Trends in Microbiology. 27:105-117.
    Abstract Summary:

    Next-generation sequencing approaches in microbiome research have allowed surveys of microbial communities, their genomes, and their functions with higher sensitivity than ever before. However, this sensitivity is a double-edged sword because these tools also efficiently detect contaminant DNA and cross-contamination, which can confound the interpretation of microbiome data. Therefore, there is an urgent need to integrate key controls into...

  • Abstract Summary:

    The green microalga, Tetraselmis suecica, is commonly used in scientific, industrial, and aquacultural purposes because of its high stress tolerance and ease of culture in wide spectrums of environments. We hypothesized that carotenoids help to protect Tetraselmis cells from environmental stress by regulating genes in biosynthetic pathways. Here, we determined three major carotenogenic genes, phytoene synthase (PSY), phytoene desaturase (PDS...

  • Abstract Summary:

    Coatings on nanoparticle (NP) surfaces play a key role in dictating their behavior in the environment. For metal oxide NPs, the physicochemical processes of dissolution, aggregation, and reactivity are all impacted by surface coatings. The current study focuses on adsorption and displacement reactions of different molecular and biological species representative of different coatings on TiO2 NP surfaces. These different species include...

  • Yarimizu K., Cruz-Lopez R., Garcia-Mendoza E., Edwards M., Carter ML, Carrano C.J.  2019.  Distribution of dissolved iron and bacteria producing the photoactive siderophore, vibrioferrin, in waters off Southern California and Northern Baja. 32:139-154.
    Abstract Summary:

    Phytoplankton blooms can cause acute effects on marine ecosystems due either to their production of endogenous toxins or to their enormous biomass leading to major impacts on local economies and public health. Despite years of effort, the causes of these Harmful Algal Blooms are still not fully understood. Our hypothesis is that bacteria that produce photoactive siderophores may provide a bioavailable source of iron for phytoplankton which...

  • Dhaneesha M., Hasin O., Sivakumar K.C, Ravinesh R., Naman C.B, Carmeli S., Sajeevan T.P.  2019.  DNA binding and molecular dynamic studies of polycyclic tetramate macrolactams (PTM) with potential anticancer activity isolated from a sponge-associated Streptomyces zhaozhouensis subsp. mycale subsp. nov. Marine Biotechnology. 21:124-137.
    Abstract Summary:

    A sponge-associated actinomycete (strain MCCB267) was isolated from a marine sponge Mycale sp. collected in the Indian Ocean off the Southeast coast of India. Phylogenetic studies of this strain using 16S rRNA gene sequencing showed high sequence similarity to Streptomyces zhaozhouensis. However, strain MCCB267 showed distinct physiological and biochemical characteristic features and was thus designated as S. zhaozhouensis subsp. mycale....

  • Murik O., Tirichine L., Prihoda J., Thomas Y., Araujo W.L, Allen A.E, Fernie A.R, Bowler C..  2019.  Downregulation of mitochondrial alternative oxidase affects chloroplast function, redox status and stress response in a marine diatom. New Phytologist. 221:1303-1316.
    Abstract Summary:

    Diatom dominance in contemporary aquatic environments indicates that they have developed unique and effective mechanisms to cope with the rapid and considerable fluctuations that characterize these environments. In view of their evolutionary history from a secondary endosymbiosis, inter-organellar regulation of biochemical activities may be of particular relevance. Diatom mitochondrial alternative oxidase (AOX) is believed to play a...

  • Wang H, Xie SP, Kosaka Y, Liu QY, Du Y..  2019.  Dynamics of Asian summer monsoon response to anthropogenic aerosol forcing. Journal of Climate. 32:843-858.
    Abstract Summary:

    Anthropogenic aerosols partially mask the greenhouse warming and cause the reduction in Asian summer monsoon precipitation and circulation. By decomposing the atmospheric change into the direct atmospheric response to radiative forcing and sea surface temperature (SST)-mediated change, the physical mechanisms for anthropogenic-aerosol-induced changes in the East Asian summer monsoon (EASM) and South Asian summer monsoon (SASM) are diagnosed....

  • Pommier A., Williams Q., Evans RL, Pal I., Zhang Z..  2019.  Electrical investigation of natural lawsonite and application to subduction contexts. Journal of Geophysical Research-Solid Earth. 124:1430-1442.
    Abstract Summary:

    We report an experimental investigation of the electrical properties of natural polycrystalline lawsonite from Reed Station, CA. Lawsonite represents a particularly efficient water reservoir in subduction contexts, as it can carry about 12wt% water and is stable over a wide pressure range. Experiments were performed from 300 to about 1325 degrees C and under pressure from 1 to 10GPa using a multi-anvil apparatus. We observe that temperature...

  • Mullineaux L.S, Metaxas A., Beaulieu S.E, Bright M., Gollner S., Grupe B.M, Herrera S., Kellner J.B, Levin L.A, Mitarai S. et al..  2018.  Exploring the ecology of deep-sea hydrothermal vents in a metacommunity framework. Frontiers in Marine Science. 5
    Abstract Summary:

    Species inhabiting deep-sea hydrothermal vents are strongly influenced by the geological setting, as it provides the chemical-rich fluids supporting the food web, creates the patchwork of seafloor habitat, and generates catastrophic disturbances that can eradicate entire communities. The patches of vent habitat host a network of communities (a metacommunity) connected by dispersal of planktonic larvae. The dynamics of the metacommunity are...

  • Wang Y.F, Day S.M, Denolle M.A.  2019.  Geometric controls on pulse-like rupture in a dynamic model of the 2015 Gorkha earthquake. Journal of Geophysical Research-Solid Earth. 124:1544-1568.
    Abstract Summary:

    The 15 April 2015 M-w 7.8 Nepal Gorkha earthquake occurred on a shallowly dipping portion of the Main Himalayan Thrust (MHT). Notable features of the event include (1) the dominance of a slip pulse of about 6-s duration that unlocked the lower edge of the MHT and (2) the near-horizontal fault geometry, which, combined with proximity of the free surface, allows surface-reflected phases to break the across-fault symmetries of the seismic...

  • Withers K.B, Olsen K.B, Day S.M, Shi Z.Q.  2019.  Ground Motion and Intraevent Variability from 3D Deterministic Broad-band (0-7.5 Hz) Simulations along a Nonplanar Strike-Slip Fault. Bulletin of the Seismological Society of America. 109:229-250.
    Abstract Summary:

    We model deterministic broadband (0-7.5 Hz) ground motion from an M-w 7.1 bilateral strike-slip earthquake scenario with dynamic rupture propagation along a rough-fault topography embedded in a medium including small-scale velocity and density perturbations. Spectral accelerations (SAs) at periods 0.2-3 s and Arias intensity durations show a similar distance decay (at the level of 1-2 interevent standard deviations above the median) when...

  • Abstract Summary:

    The total synthesis of majusculamide D (MJS-D) is described, a lipopentapeptide originally isolated from Lyngbya majuscula and reisolated from a Moorea sp. MJS-D possesses selective and potent cancer cell toxicity. A scalable and convergent strategy with a minimal number of purifications produced significant quantities of MJM-D for in vivo evaluations. The absolute configuration of the 1,3-dimethyl-octanamide motif was determined by synthesis...

  • Webb S.J, Rabsattt T., Erazo N., Bowman J.S.  2019.  Impacts of Zostera eelgrasses on microbial community structure in San Diego coastal waters. 7
    Abstract Summary:

    Marine eelgrasses are influential to their surrounding environments through their many ecosystem services, ranging from the provisioning of food and shelter for marine life to serving as a natural defense against pollution and pathogenic bacteria. In the marine waters of San Diego, CA, USA, eelgrass beds comprised of Zostera spp. are an integral part of the coastal ecosystem. To evaluate the impact of eelgrass on bacterial and archaeal...

  • Abstract Summary:

    Sequential enzymatic reactions on substrates tethered to carrier proteins (CPs) generate thiotemplated building blocks that are then delivered to nonribosomal peptide synthetases (NRPSs) to generate peptidic natural products. The underlying diversity of these thiotemplated building blocks is the principal driver of the chemical diversity of NRPS-derived natural products. Structural insights into recognition of CPs by tailoring enzymes that...

  • Zheng XT, Hui C., Xie SP, Cai W.J, Long S.M.  2019.  Intensification of El Nino Rainfall Variability Over the Tropical Pacific in the Slow Oceanic Response to Global Warming. Geophysical Research Letters. 46:2253-2260.
    Abstract Summary:

    Changes in rainfall variability of El Nino-Southern Oscillation (ENSO) are investigated under scenarios where the greenhouse gases increase and then stabilize. During the period of increasing greenhouse forcing, the ocean mixed layer warms rapidly. After the forcing stabilizes, the deeper ocean continues to warm the surface (the slow response). We show that ENSO rainfall variability over the tropical Pacific intensifies in both periods but...

  • Kuriyama P.T, Branch T.A, Hicks A.C, Harms J.H, Hamel O.S.  2019.  Investigating three sources of bias in hook-and-line surveys: survey design, gear saturation, and multispecies interactions. Canadian Journal of Fisheries and Aquatic Sciences. 76:192-207.
    Abstract Summary:

    Hook-and-line surveys can be used to estimate population trends in fish species where conventional methods such as trawl, acoustic, visual, or pot surveys cannot be applied. Hook-and-line surveys allow for the collection of biological information, but the resultant indices of abundance may be biased. We designed simulations to address concerns around survey design, hook saturation, and competition among species and found that catch per unit...

  • Cappa CD, Zhang X.L, Russell LM, Collier S., Lee A.KY, Chen C.L, Betha R., Chen S.J, Liu J., Price D.J et al..  2019.  Light absorption by ambient black and brown carbon and its dependence on black carbon coating state for two California, USA, cities in winter and summer. Journal of Geophysical Research-Atmospheres. 124:1550-1577.
    Abstract Summary:

    Observations from a wintertime and summertime field campaign are used to assess the relationship between black and brown carbon (BC and BrC, respectively) optical properties and particle composition and coating state. The wintertime campaign, in Fresno, CA, was impacted by primary emissions from residential wood burning, secondary organic and inorganic particle formation, and BC from motor vehicles. Two major types of BrC were observed in...

  • Olofsson M., Torstensson A., Karlberg M., Steinhoff F.S, Dinasquet J., Riemann L., Chierici M., Wulff A..  2019.  Limited response of a spring bloom community inoculated with filamentous cyanobacteria to elevated temperature and pCO(2). Botanica Marina. 62:3-16.
    Abstract Summary:

    Temperature and CO2 levels are projected to increase in the future, with consequences for carbon and nutrient cycling in brackish environments, such as the Baltic Sea. Moreover, filamentous cyanobacteria are predicted to be favored over other phytoplankton groups under these conditions. Under a 12-day outdoor experiment, we examined the effect on a natural phytoplankton spring bloom community of elevated temperature (from 1 degrees C to 4...

  • Scott R.C, Nicolas J.P, Bromwich D.H, Norris J.R, Lubin D..  2019.  Meteorological drivers and large-scale climate forcing of West Antarctic Surface Melt. Journal of Climate. 32:665-684.
    Abstract Summary:

    Understanding the drivers of surface melting in West Antarctica is crucial for understanding future ice loss and global sea level rise. This study identifies atmospheric drivers of surface melt on West Antarctic ice shelves and ice sheet margins and relationships with tropical Pacific and high-latitude climate forcing using multidecadal reanalysis and satellite datasets. Physical drivers of ice melt are diagnosed by comparing satellite-...

  • Abstract Summary:

    Temperature and light are fundamental environmental variables which regulate phytoplankton growth rates when nutrients are in excess. For polar coastal oceans that are undergoing changes in sea ice cover and warming, light, and temperature are particularly important for bloom dynamics. Using colonial Phaeocystis antarctica cultures grown at steady-state, we assessed the combined effect of these two environmental controls on net growth rate (...

  • Abstract Summary:

    The development of osmoregulatory and gas exchange organs was studied in larval yellowfin tuna (Thunnus albacares) from 2 to 25 days post-hatching (2.9-24.5mm standard length, SL). Cutaneous and branchial ionocytes were identified using Na+/K+-ATPase immunostaining and scanning electron microscopy. Cutaneous ionocyte abundance significantly increased with SL, but a reduction in ionocyte size and density resulted in asignificant decrease in...

  • B. Pan J, Vernet M, Reynolds RA, B. Mitchell G.  2019.  The optical and biological properties of glacial meltwater in an Antarctic fjord. Plos One. 14
    Abstract Summary:

    As the Western Antarctic Peninsula (WAP) region responds to a warmer climate, the impacts of glacial meltwater on the Southern Ocean are expected to intensify. The Antarctic Peninsula fjord system offers an ideal system to understand meltwater’s properties, providing an extreme in the meltwater’s spatial gradient from the glacio-marine boundary to the WAP continental shelf. Glacial meltwater discharge in Arctic and Greenland fjords is...

  • Abbatt J.PD, Leaitch WR, Aliabadi A.A, Bertram A.K, Blanchet J.P, Boivin-Rioux A., Bozem H., Burkart J., Chang R.YW, Charette J. et al..  2019.  Overview paper: New insights into aerosol and climate in the Arctic. Atmospheric Chemistry and Physics. 19:2527-2560.
    Abstract Summary:

    Motivated by the need to predict how the Arctic atmosphere will change in a warming world, this article summarizes recent advances made by the research consortium NETCARE (Network on Climate and Aerosols: Addressing Key Uncertainties in Remote Canadian Environments) that contribute to our fundamental understanding of Arctic aerosol particles as they relate to climate forcing. The overall goal of NETCARE research has been to use an...

  • Fang X.K, Park S., Saito T., Tunnicliffe R., Ganesan A.L, Rigby M, Li S.L, Yokouchi Y., Fraser PJ, Harth CM et al..  2019.  Rapid increase in ozone-depleting chloroform emissions from China. Nature Geoscience. 12:89-+.
    Abstract Summary:

    Chloroform contributes to the depletion of the stratospheric ozone layer. However, due to its short lifetime and predominantly natural sources, it is not included in the Montreal Protocol that regulates the production and uses of ozone-depleting substances. Atmospheric chloroform mole fractions were relatively stable or slowly decreased during 1990-2010. Here we show that global chloroform mole fractions increased after 2010, based on in situ...

  • Bradley J.M, Svistunenko D.A, Pullin J., Hill N., Stuart RK, Palenik B, Wilson M.T, Hemmings A.M, Moore G.R, Le Brun N.E.  2019.  Reaction of O-2 with a diiron protein generates a mixed-valent Fe2+/Fe3+ center and peroxide. Proceedings of the National Academy of Sciences of the United States of America. 116:2058-2067.
    Abstract Summary:

    The gene encoding the cyanobacterial ferritin SynFtn is up-regulated in response to copper stress. Here, we show that, while SynFtn does not interact directly with copper, it is highly unusual in several ways. First, its catalytic diiron ferroxidase center is unlike those of all other characterized prokaryotic ferritins and instead resembles an animal H-chain ferritin center. Second, as demonstrated by kinetic, spectro-scopic, and high-...

  • Crosby S.C, Kumar N., O'Reilly W.C, Guza RT.  2019.  Regional swell transformation by backward ray tracing and SWAN. Journal of Atmospheric and Oceanic Technology. 36:217-229.
    Abstract Summary:

    Beach erosion and wave-induced flooding models are often initialized in O(10)-m depth, seaward of the surfzone, with wave conditions estimated from regional nonlinear spectral wave models [e.g., Simulating Waves Nearshore (SWAN)]. These models are computationally expensive for high-resolution, long-term regional O(100)-km hindcasts, and they limit examination of the effect of different climate scenarios on nearshore processes. Alternatively,...

  • Zhang Z.H, Ralph FM, Zheng M.H.  2019.  The relationship between extratropical cyclone strength and atmospheric river intensity and position. Geophysical Research Letters. 46:1814-1823.
    Abstract Summary:

    Extratropical cyclones (ECs) and atmospheric rivers (ARs) impact precipitation over the U.S. West Coast and other analogous regions globally. This study investigates the relationship between ECs and ARs by exploring the connections between EC strength and AR intensity and position using a new AR intensity scale. While 82% of ARs are associated with an EC, only 45% of ECs have a paired AR and the distance between the AR and EC varies greatly....

  • Rowell T.J, Aburto-Oropeza O, Cota-Nieto J.J, Steele M.A, Erisman B.E.  2019.  Reproductive behaviour and concurrent sound production of Gulf grouper Mycteroperca jordani (Epinephelidae) at a spawning aggregation site. Journal of Fish Biology. 94:277-296.
    Abstract Summary:

    The reproductive and acoustic behaviours of Gulf grouper Mycteroperca jordani were studied at a spawning aggregation site in the southern Gulf of California, Mexico. In May 2015-2017, divers located and surveyed a spawning aggregation site within Cabo Pulmo National Park. Adult M. jordani conformed to a lek mating system in which large males formed territories over sand adjacent to a rocky reef that were spatially segregated from smaller...

  • Le T.C, Lee E.J, Lee J., Hong A., Yim C.Y, Yang I., Choi H., Chin J., Cho S.J, Ko J. et al..  2019.  Saccharoquinoline, a cytotoxic alkaloidal meroterpenoid from marine-derived bacterium Saccharomonospora sp. Marine Drugs. 17
    Abstract Summary:

    A cytotoxic alkaloidal meroterpenoid, saccharoquinoline (1), has been isolated from the fermentation broth of the marine-derived bacterium Saccharomonospora sp. CNQ-490. The planar structure of 1 was elucidated by 1D, 2D NMR, and MS spectroscopic data analyzes, while the relative configuration of 1 was defined through the interpretation of NOE spectroscopic data. Saccharoquinoline (1) is composed of a drimane-type sesquiterpene unit in...

  • Frouin R., Ramon D., Boss E., Jolivet D., Compiegne M., Tan J., Bouman H., Jackson T., Franz B., Plett T. et al..  2018.  Satellite radiation products for ocean biology and biogeochemistry: Needs, state-of-the-art, gaps, development priorities, and opportunities. Frontiers in Marine Science. 5
    Abstract Summary:

    Knowing the spatial and temporal distribution of the underwater light field, i.e., the spectral and angular structure of the radiant intensity at any point in the water column, is essential to understanding the biogeochemical processes that control the composition and evolution of aquatic ecosystems and their impact on climate and reaction to climate change. At present, only a few properties are reliably retrieved from space, either directly...

  • Ralph FM, Rutz J.J, Cordeira JM, Dettinger M, Anderson M., Reynolds D., Schick L.I, Smallcomb C..  2019.  A scale to characterize the strength and impacts of atmospheric rivers. Bulletin of the American Meteorological Society. 100:269-290.
    Abstract Summary:

    Atmospheric rivers (ARs) play vital roles in the western United States and related regions globally, not only producing heavy precipitation and flooding, but also providing beneficial water supply. This paper introduces a scale for the intensity and impacts of ARs. Its utility may be greatest where ARs are the most impactful storm type and hurricanes, nor'easters, and tornadoes are nearly nonexistent. Two parameters dominate the hydrologic...

  • Lozier M.S, Li F., Bacon S., Bahr F., Bower A.S, Cunningham S.A, de Jong M.F, de Steur L., Deyoung B., Fischer J. et al..  2019.  A sea change in our view of overturning in the subpolar North Atlantic. Science. 363:516-+.
    Abstract Summary:

    To provide an observational basis for the Intergovernmental Panel on Climate Change projections of a slowing Atlantic meridional overturning circulation (MOC) in the 21st century, the Overturning in the Subpolar North Atlantic Program (OSNAP) observing system was launched in the summer of 2014. The first 21-month record reveals a highly variable overturning circulation responsible for the majority of the heat and freshwater transport across...

  • Wang Q., Benmarhnia T., Li C.C, Knibbs L.D, Bao J.Z, Ren M., Zhang H.H, Wang S.H, Zhang Y.W, Zhao Q.G et al..  2019.  Seasonal analyses of the association between prenatal ambient air pollution exposure and birth weight for gestational age in Guangzhou, China. Science of the Total Environment. 649:526-534.
    Abstract Summary:

    Ambient air pollution has been linked to small for gestational age (SGA); however, the relationship with large for gestational age (ILA) is unclear and very few studies have investigated seasonal effects on the association between air pollution and SGA or LGA. Using birth registry data of 506,000 singleton live births from 11 districts in Guangzhou, China between January 2015 and July 2017, we examined associations between ambient air...

  • Doran A.K, Laske G..  2019.  Seismic structure of marine sediments and upper oceanic crust surrounding Hawaii. Journal of Geophysical Research-Solid Earth. 124:2038-2056.
    Abstract Summary:

    We present models of compressional and shear velocity structure of the oceanic sediments and upper crust surrounding the Hawaiian islands. The models were derived from analysis of seafloor compliance data and measurements of Ps converted phases originating at the sediment-bedrock interface. These data were estimated from continuous broadband ocean bottom seismometer acceleration and pressure records collected during the Plume-Lithosphere...

  • Nagy L., Williams W., Tauxe L, Muxworthy A.R, Ferreira I..  2019.  Thermomagnetic recording fidelity of nanometer-sized iron and implications for planetary magnetism. Proceedings of the National Academy of Sciences of the United States of America. 116:1984-1991.
    Abstract Summary:

    Paleomagnetic observations provide valuable evidence of the strength of magnetic fields present during evolution of the Solar System. Such information provides important constraints on physical processes responsible for rapid accretion of the protoplanetesimal disk. For this purpose, magnetic recordings must be stable and resist magnetic overprints from thermal events and viscous acquisition over many billions of years. A lack of...

  • Smith N., Kessler W.S, Cravatte S., Sprintall J, Wijffels S., Cronin MF, Sutton A., Serra Y.L, Dewitte B., Strutton P.G et al..  2019.  Tropical Pacific Observing System. Frontiers in Marine Science. 6
    Abstract Summary:

    This paper reviews the design of the Tropical Pacific Observing System (TPOS) and its governance and takes a forward look at prospective change. The initial findings of the TPOS 2020 Project embrace new strategic approaches and technologies in a user-driven design and the variable focus of the Framework for Ocean Observing. User requirements arise from climate prediction and research, climate change and the climate record, and coupled...

  • Withers K.B, Olsen K.B, Shi Z.Q, Day S.M.  2019.  Validation of deterministic broadband ground motion and variability from dynamic rupture simulations of buried thrust earthquakes. Bulletin of the Seismological Society of America. 109:212-228.
    Abstract Summary:

    We numerically model broadband ground motion (up to 5-7: 5 Hz) from blind-thrust scenario earthquakes matching the fault geometry of the 1994 M-w 6.7 Northridge earthquake. Several realizations are modeled (by varying the hypocenter location in the dynamic rupture simulation) in a 1D-layered velocity profile. In addition, we include Q(f), nonlinear effects from Drucker-Prager plasticity, and superimpose small-scale medium complexity in both a...

  • Fang Y., Riahi S., McDonald A.T, Shrestha M., Tobias D.J, Grassian VH.  2019.  What is the driving force behind the adsorption of hydrophobic molecules on hydrophilic surfaces? Journal of Physical Chemistry Letters. 10:468-473.
    Abstract Summary:

    The adsorption of limonene, a common organic compound found in indoor air, on hydrophilic surfaces such as glass (SiO2), a prevalent surface in the indoor environment, is poorly understood. In this study, we have investigated the interaction of limonene and three other cyclic hydrocarbons (cyclohexane, cyclohexene, and benzene) on hydroxylated SiO2 using infrared spectroscopy and ab initio molecular dynamics (AIMD) simulations. Experimental...

  • Chen H.M, Yang R., Chen J.J, Luo Q.J, Cui X.S, Yan X.J, Gerwick WH.  2019.  1-Octen-3-ol, a self-stimulating oxylipin messenger, can prime and induce defense of marine alga. 19
    Abstract Summary:

    Short chain oxylipins in plants as the main volatile organic carbon have been speculated to playing an important role for plant innate immunity, however, not yet intensively studied and far away established as the fully recognized algae defense signals.ResultsThe production of 1-octen-3-ol is self-amplified via the fatty acid-oxylipin metabolic cycle through positive feedback loop. Production of 1-octen-3-ol may act as a messenger that...

  • Hartmann A.C, Marhaver KL, Klueter A., Lovci M.T, Closek C.J, Diaz E., Chamberland V.F, Archer FI, Deheyn DD, Vermeij MJA et al..  2019.  Acquisition of obligate mutualist symbionts during the larval stage is not beneficial for a coral host. Molecular Ecology. 28:141-155.
    Abstract Summary:

    Theory suggests that the direct transmission of beneficial endosymbionts (mutualists) from parents to offspring (vertical transmission) in animal hosts is advantageous and evolutionarily stable, yet many host species instead acquire their symbionts from the environment (horizontal acquisition). An outstanding question in marine biology is why some scleractinian corals do not provision their eggs and larvae with the endosymbiotic...

  • Scott S.R, Sims K.WW, Reagan M.K, Ball L., Schwieters J.B, Bouman C., Lloyd N.S, Waters C.L, Standish J.J, Tollstrup D.L.  2019.  The application of abundance sensitivity filters to the precise and accurate measurement of uranium series nuclides by plasma mass spectrometry. International Journal of Mass Spectrometry. 435:321-332.
    Abstract Summary:

    Application of retardation filters has revolutionized the use of multi-collector inductively coupled plasma mass spectrometry (MC-ICPMS) for the measurement of U-series disequilibria. Here, we present an evaluation of the application of retardation energy filters coupled with ion counting detectors for the measurement of U-series disequilibria by MC-ICPMS. We show that: 1) The RPQ minimizes backgrounds caused by ions experiencing irregular...

  • Abstract Summary:

    We present consistent annual mean atmospheric histories and growth rates for the mainly anthropogenic halogenated compounds HCFC-22, HCFC-141b, HCFC-142b, HFC-134a, HFC-125, HFC-23, PFC-14 and PFC-116, which are all potentially useful oceanic transient tracers (tracers of water transport within the ocean), for the Northern and Southern Hemisphere with the aim of providing input histories of these compounds for the equilibrium between the...

  • Rabille H., Billoud B., Tesson B, Le Panse S., Rolland E., Charrier B..  2019.  The brown algal mode of tip growth: Keeping stress under control. Plos Biology. 17
    Abstract Summary:

    Tip growth has been studied in pollen tubes, root hairs, and fungal and oomycete hyphae and is the most widely distributed unidirectional growth process on the planet. It ensures spatial colonization, nutrient predation, fertilization, and symbiosis with growth speeds of up to 800 mu m h(-1). Although turgor-driven growth is intuitively conceivable, a closer examination of the physical processes at work in tip growth raises a paradox: growth...

  • Oliver M.J, Kohut J.T, Bernard K., Fraser W., Winsor P., Statscewich H., Fredj E., Cimino M., Patterson-Fraser D., Carvalho F..  2019.  Central place foragers select ocean surface convergent features despite differing foraging strategies. Scientific Reports. 9
    Abstract Summary:

    Discovering the predictors of foraging locations can be challenging, and is often the critical missing piece for interpreting the ecological significance of observed movement patterns of predators. This is especially true in dynamic coastal marine systems, where planktonic food resources are diffuse and must be either physically or biologically concentrated to support upper trophic levels. In the Western Antarctic Peninsula, recent climate...

  • Roche J.W, Rice R., Meng X.D, Cayan DR, Dettinger MD, Alden D., Patel S.C, Mason M.A, Conklin M.H, Bales R.C.  2019.  Climate, snow, and soil moisture data set for the Tuolumne and Merced river watersheds, California, USA. Earth System Science Data. 11:101-110.
    Abstract Summary:

    We present hourly climate data to force land surface process models and assessments over the Merced and Tuolumne watersheds in the Sierra Nevada, California, for the water year 2010-2014 period. Climate data (38 stations) include temperature and humidity (23), precipitation (13), solar radiation (8), and wind speed and direction (8), spanning an elevation range of 333 to 2987 m. Each data set contains raw data as obtained from the source (...

  • Olive J.A, Parnell-Turner R., Escartin J., Smith D.K, Petersen S..  2019.  Controls on the seafloor exposure of detachment fault surfaces. Earth and Planetary Science Letters. 506:381-387.
    Abstract Summary:

    While oceanic detachment faults have been proposed to account for the accretion of similar to 40% of new seafloor in the North Atlantic ocean, clear exposures of large-offset, often-corrugated fault surfaces remain scarce and spatially limited. To help resolve this paradox, we examine the conditions under which detachment fault growth may or may not lead to extensive exposure of corrugated fault planes at the seafloor. Using high-resolution...

  • Fisher A., Wangpraseurt D., Larkum A.WD, Johnson M., Kuhl M., Chen M., Wong H.L, Burns B.P.  2019.  Correlation of bio-optical properties with photosynthetic pigment and microorganism distribution in microbial mats from Hamelin Pool, Australia. Fems Microbiology Ecology. 95
    Abstract Summary:

    Microbial mats and stromatolites are widespread in Hamelin Pool, Shark Bay, however the phototrophic capacity of these systems is unknown. This study has determined the optical properties and light-harvesting potential of these mats with light microsensors. These characteristics were linked via a combination of 16S rDNA sequencing, pigment analyses and hyperspectral imaging. Local scalar irradiance was elevated over the incident downwelling...

sharknado