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Recent Publications

  • Asher E., Hornbrook R.S, Stephens B.B, Kinnison D., Morgan E.J, Keeling RF, Atlas E.L, Schauffler S.M, Tilmes S., Kort E.A et al..  2019.  Novel approaches to improve estimates of short-lived halocarbon emissions during summer from the Southern Ocean using airborne observations. 19:14071-14090.
    Abstract Summary:

    Fluxes of halogenated volatile organic compounds (VOCs) over the Southern Ocean remain poorly understood, and few atmospheric measurements exist to constrain modeled emissions of these compounds. We present observations of CHBr3, CH2Br2, CH3I, CHClBr2, CHBrCl2, and CH3Br during the O-2/N-2 Ratio and CO2 Airborne Southern Ocean (ORCAS) study and the second Atmospheric Tomography mission (ATom-2) in January and February of 2016 and 2017. Good...

  • Costa J.AV, Freitas B.CB, Rosa G.M, Moraes L., Morais M.G, Mitchell B.G.  2019.  Operational and economic aspects of Spirulina-based biorefinery. 292
    Abstract Summary:

    Microalgae biorefinery systems have been extensively studied from the perspective of resources, energy expenditure, biofuel production potential, and high-added value products. The genus Spirulina (Arthrospira) stands out among the microalgae of commercial importance. It accounts for over 30% of biomass produced globally because of high protein concentration and, carotenoid and phycocyanin content. Spirulina cultivation can be used to reduce...

  • Abstract Summary:

    An extensive data set of measurements within the Chukchi and Beaufort Seas is used to characterize the optical properties of seawater associated with different phytoplankton communities. Hierarchical cluster analysis of diagnostic pigment concentrations partitioned stations into four distinct surface phytoplankton communities based on taxonomic composition and average cell size. Concurrent optical measurements of spectral absorption and...

  • Gonzalez-Solis D., Soler-Jimenez L.C, Aguirre-Macedo M.L, McLaughlin J.P, Shaw J.C, James A.K, Hechinger R.E, Kuris A.M, Lafferty K.D, Vidal-Martinez V.M.  2019.  Parasitic nematodes of marine fishes from Palmyra Atoll, East Indo-Pacific, including a new species of Spinitectus (Nematoda, Cystidicolidae). :1-26.
    Abstract Summary:

    Here, we present the results of a taxonomic survey of the nematodes parasitizing fishes from the lagoon flats of Palmyra Atoll, Eastern Indo-Pacific. We performed quantitative parasitological surveys of 653 individual fish from each of the 44 species using the intertidal sand flats that border the atoll's lagoon. We provide morphological descriptions, prevalence, and mean intensities of the recovered seven species of adult nematode (...

  • Abstract Summary:

    Abstract Microplastics (< 5 mm) have long been a concern in marine debris research, but quantifying the smallest microplastics (< 333 μm) has been hampered by appropriate collection methods, like net tows. We modified standard epifluorescence microscopy methods to develop a new technique to enumerate < 333 μm microplastics (mini-microplastics) from filtered surface seawater samples and salp stomach contents. This permitted us to...

  • Meskhidze N., Volker C., Al-Abadleh H.A, Barbeau K., Bressac M., Buck C., Bundy R.M, Croot P., Feng Y., Ito A. et al..  2019.  Perspective on identifying and characterizing the processes controlling iron speciation and residence time at the atmosphere-ocean interface. 217
    Abstract Summary:

    It is well recognized that the atmospheric deposition of iron (Fe) affects ocean productivity, atmospheric CO2 uptake, ecosystem diversity, and overall climate. Despite significant advances in measurement techniques and modeling efforts, discrepancies persist between observations and models that hinder accurate predictions of processes and their global effects. Here, we provide an assessment report on where the current state of knowledge is...

  • Gove JM, Whitney J.L, McManus MA, Lecky J., Carvalho F.C, Lynch J.M, Li J.W, Neubauer P., Smith K.A, Phipps J.E et al..  2019.  Prey-size plastics are invading larval fish nurseries. 116:24143-24149.
    Abstract Summary:

    Life for many of the world's marine fish begins at the ocean surface. Ocean conditions dictate food availability and govern survivorship, yet little is known about the habitat preferences of larval fish during this highly vulnerable life-history stage. Here we show that surface slicks, a ubiquitous coastal ocean convergence feature, are important nurseries for larval fish from many ocean habitats at ecosystem scales. Slicks had higher...

  • Abstract Summary:

    The adverse health impact of high heat is widely documented and can lead to a substantial public health burden. Although heat-related illness in western countries is largely preventable, extreme heat remains the main weather contributor to the burden of disease in the United States. In most US cities, local National Weather Service offices issue heat alerts in advance of forecast periods of high heat. In some locations, additional local heat...

  • Coale T.H, Moosburner M., Horak A., Obornik M., Barbeau K.A, Allen A.E.  2019.  Reduction-dependent siderophore assimilation in a model pennate diatom. 116:23609-23617.
    Abstract Summary:

    Iron uptake by diatoms is a biochemical process with global biogeochemical implications. In large regions of the surface ocean diatoms are both responsible for the majority of primary production and frequently experiencing iron limitation of growth. The strategies used by these phytoplankton to extract iron from seawater constrain carbon flux into higher trophic levels and sequestration into sediments. In this study we use reverse genetic...

  • Abstract Summary:

    Morphological plasticity is a critical mechanism that animals use to cope with variations in resource availability. During periods of food scarcity, sea urchins demonstrate an increase in jaw length relative to test diameter. This trait is thought to be reversible and adaptive by yielding an increase in feeding efficiency. We directly tested the hypotheses that (1) there are reversible shifts in jaw length to test diameter ratios with food...

  • Sandoval J.A, Jadhav S., Quan H.C, Deheyn DD, Tolley M.T.  2019.  Reversible adhesion to rough surfaces both in and out of water, inspired by the clingfish suction disc. 14
    Abstract Summary:

    Adhesion is difficult to achieve on rough surfaces both in air and underwater. In nature, the northern clingfish (Gobiesox maeandricus) has evolved the impressive ability to adhere onto substrates of various shapes and roughnesses, while subject to strong intertidal surges. The suction disc of the clingfish relies on suction and friction to achieve and maintain adhesion. Inspired by this mechanism of attachment, we designed an artificial...

  • Ohishi S., Katsura S., Aiki H..  2019.  Salinity frontogenesis/frontolysis in the northeastern subtropical Pacific region. 53:5927-5943.
    Abstract Summary:

    Detailed mechanisms of reinforcement/relaxation of a sea surface salinity front, i.e. frontogenesis/frontolysis, in the northeastern subtropical Pacific region are investigated using observational datasets. Throughout the year, meridional shears of zonal wind induce meridional ageostrophic convergence around the front. Saltier water is advected on the southern side than the northern side, and thus the convergence contributes to frontogenesis...

  • Meijers A.JS, Cerovecki I, King B.A, Tamsitt V..  2019.  A see-saw in Pacific subantarctic mode water formation driven by atmospheric modes.
    Abstract Summary:

    Subantarctic Mode Water (SAMW) in the Pacific forms in two distinct pools in the south central and southeast Pacific, which subduct into the ocean interior and impact global storage of heat and carbon. Wintertime thickness of the central and eastern SAMW pools vary predominantly out of phase with each other, by up to +/- 150 m between years, resulting in an interannual thickness see-saw. The thickness in the eastern (central) pool is found to...

  • Uchida T., Balwada D., Abernathey R., Prend C.J, Boss E., Gille ST.  2019.  Southern Ocean phytoplankton blooms observed by biogeochemical floats.
    Abstract Summary:

    The spring bloom in the Southern Ocean is the rapid-growth phase of the seasonal cycle in phytoplankton. Many previous studies have characterized the spring bloom using chlorophyll estimates from satellite ocean color observations. Assumptions regarding the chlorophyll-to-carbon ratio within phytoplankton and vertical structure of biogeochemical variables lead to uncertainty in satellite-based estimates of phytoplankton carbon biomass. Here,...

  • Enzminger T.L, Small E.E, Borsa A.A.  2019.  Subsurface water dominates Sierra Nevada seasonal hydrologic storage.
    Abstract Summary:

    Vertical displacements (dz) in permanent Global Positioning System (GPS) station positions enable estimation of water storage changes (Delta S), which historically have been impossible to measure directly. We use dz from 924 GPS stations in the western United States to estimate daily Delta S in California's Sierra Nevada and compare it to seasonal snow accumulation and melt over water years 2008-2017. Seasonal variations in GPS-based Delta S...

  • Morgan E.J, Stephens B.B, Long M.C, Keeling RF, Bent J.D, McKain K., Sweeney C, Hoecker-Martinez M.S, Kort E.A.  2019.  Summertime atmospheric boundary layer gradients of O-2 and CO2 over the Southern Ocean.
    Abstract Summary:

    We present airborne observations of the vertical gradient of atmospheric oxygen (delta(O-2/N-2)) and carbon dioxide (CO2) through the atmospheric boundary layer (BL) over the Drake Passage region of the Southern Ocean, during the O-2/N-2 Ratio and CO2 Airborne Southern Ocean Study, from 15 January to 29 February 2016. Gradients were predominately anticorrelated, with excesses of delta(O-2/N-2) and depletions of CO2 found within the boundary...

  • Li K., Dai S.K, Chen Q.R, Zhang Q.J, Zhao D.D, Wang S.G, Ling J.X.  2019.  Three-dimensional modeling of magnetic anomaly integral solution in a mixed space-wavenumber domain. 62:4437-4450.
    Abstract Summary:

    The paper presents a three-dimensional (3D) modeling method, engaged with a mixed space-wavenumber domain, for the magnetic anomaly field. Based on the fact that the 3D space domain integral for magnetic potential is convolution, the 3D integral problem of magnetic potential in space domain can be transformed into one dimensional (1D) integral problems in vertical direction independently to each other using the two-dimensional (2D) Fourier...

  • Johnson A.C, Aarons S.M, Dauphas N., Nie N.X, Zeng H., Helz R.T, Romaniello S.J, Anbar A.D.  2019.  Titanium isotopic fractionation in Kilauea Iki lava lake driven by oxide crystallization. 264:180-190.
    Abstract Summary:

    Recent work has demonstrated that titanium (Ti) isotopes undergo mass-dependent isotope fractionation during magmatic differentiation, leaving evolved silicic melts preferentially enriched in heavy Ti isotopes. Preferential incorporation of light Ti isotopes in crystallizing Fe-Ti oxides is thought to be the mechanism responsible for this fractionation in magmatic rocks. To test this hypothesis, we present Ti isotope measurements of Fe-Ti...

  • Klein E., Bock Y, Xu X.H, Sandwell DT, Golriz D., Fang P., Su L.N.  2019.  Transient deformation in California from two decades of GPS displacements: Implications for a three-dimensional kinematic reference frame. 124:12189-12223.
    Abstract Summary:

    Our understanding of plate boundary deformation has been enhanced by transient signals observed against the backdrop of time-independent secular motions. We make use of a new analysis of displacement time series from about 1,000 continuous Global Positioning System (GPS) stations in California from 1999 to 2018 to distinguish tectonic and nontectonic transients from secular motion. A primary objective is to define a high-resolution three-...

  • Abstract Summary:

    In response to environmental change, organisms rely on both genetic adaptation and phenotypic plasticity to adjust key traits that are necessary for survival and reproduction. Given the accelerating rate of climate change, plasticity may be particularly important. For organisms in warming aquatic habitats, upper thermal tolerance is likely to be a key trait, and many organisms express plasticity in this trait in response to developmental or...

  • Abstract Summary:

    Conductivity-temperature-depth data from instrumented seals of the Marine Mammals Exploring Oceans from Pole to Pole program are analyzed to characterize the water masses and the seasonality of the marginal seas. Bottom temperatures are found to be in a cold regime in Dense Shelf Water (DSW) producing regions, identified in this study as the southern Weddell Sea, Cape Darnley, Prydz Bay, Adelie Coast, and the western Ross Sea. DSW occupies...

  • Chen C.L, Wang G.H, Xie SP, Liu W.  2019.  Why does global warming weaken the Gulf Stream but intensify the Kuroshio? 32:7437-7451.
    Abstract Summary:

    The Kuroshio and Gulf Stream, the subtropical western boundary currents of the North Pacific and North Atlantic, play important roles in meridional heat transport and ocean-atmosphere interaction processes. Using a multimodel ensemble of future projections, we show that a warmer climate intensifies the upper-layer Kuroshio, in contrast to the previously documented slowdown of the Gulf Stream. Our ocean general circulation model experiments...

  • Trexler A.W, Knudsen G.A, Nicklisch S.CT, Birnbaum L.S, Cannon R.E.  2019.  2,4,6-tribromophenol exposure decreases p-glycoprotein transport at the blood-brain barrier. 171:463-472.
    Abstract Summary:

    2,4,6-Tribromophenol (TBP, CAS No. 118-79-6) is a brominated chemical used in the production of flame-retardant epoxy resins and as a wood preservative. In marine environments, TBP is incorporated into shellfish and consumed by predatory fish. Food processing and water treatment facilities produce TBP as a byproduct. 2,4,6-Tribromophenol has been detected in human blood and breast milk. Biologically, TBP interferes with estrogen and thyroid...

  • Abstract Summary:

    Background: High ambient temperature has been linked to a number of types of morbidity, such as cardiovascular disease and dehydration. Fewer studies have explored specifically the relationship between ambient temperature and liver, kidney, and urinary system morbidity despite known biological impacts of extreme high temperatures on those systems. Objective: We assessed the relationship between temperature and hospitalizations related to...

  • Fish M.A, Wilson A.M, Ralph FM.  2019.  Atmospheric river families: Definition and associated synoptic conditions. 20:2091-2108.
    Abstract Summary:

    Atmospheric rivers (ARs) can cause flooding when they are strong and stall over an already wet watershed. While earlier studies emphasized the role of individual, long-duration ARs in triggering floods, it is not uncommon for floods to be associated with a series of ARs that strike in close succession. This study uses measurements from an atmospheric river observatory at Bodega Bay (BBY), in Northern California, to identify periods when...

  • Lilly L.E, Send U, Lankhorst M., Martz T.R, Feely R.A, Sutton A.J, Ohman MD.  2019.  Biogeochemical anomalies at two Southern California Current system moorings during the 2014-2016 Warm Anomaly-El Nino Sequence.
    Abstract Summary:

    We analyzed impacts of the 2014-2015 Pacific Warm Anomaly and 2015-2016 El Nino on physical and biogeochemical variables at two southern California Current System moorings (CCE2, nearshore upwelling off Point Conception; CCE1, offshore California Current). Nitrate and Chl-a fluorescence were <1 mu M and <1 Standardized Fluorescence Unit, respectively, at CCE2 for the entire durations of the Warm Anomaly and El Nino, the two longest...

  • Chaix B., Benmarhnia T., Kestens Y., Brondeel R., Perchoux C., Gerber P., Duncan D.T.  2019.  Combining sensor tracking with a GPS-based mobility survey to better measure physical activity in trips: public transport generates walking. 16
    Abstract Summary:

    Background Policymakers need accurate data to develop efficient interventions to promote transport physical activity. Given the imprecise assessment of physical activity in trips, our aim was to illustrate novel advances in the measurement of walking in trips, including in trips incorporating non-walking modes. Methods We used data of 285 participants (RECORD MultiSensor Study, 2013-2015, Paris region) who carried GPS receivers and...

  • Abstract Summary:

    Ground-based remote sensing measurements from the Atmospheric Radiation Measurement Program (ARM) West Antarctic Radiation Experiment (AWARE) campaign at the McMurdo station and the ARM North Slope of Alaska (NSA) Utqia & x121;vik site are used to retrieve and analyze single-layer stratiform mixed-phase cloud macrophysical and microphysical properties for these different polar environments. Single-layer stratiform mixed-phase clouds have...

  • Cordero-Quiros N., Miller AJ, Subramanian AC, Luo J.Y, Capotondi A..  2019.  Composite physical-biological El Nino and La Nina conditions in the California Current System in CESM1-POP2-BEC. 142
    Abstract Summary:

    El Nino-Southern Oscillation (ENSO) is recognized as one of the potentially predictable drivers of California Current System (CCS) variability. In this study, we analyze a 67-year coarse-resolution (similar to 1 degrees) simulation using the ocean model CESM-POP2-BEC forced by NCEP/NCAR reanalysis winds to develop a model composite of the physical-biological response of the CCS during ENSO events. The model results are also compared with...

  • Highlighted Publication Zonal–vertical distribution of (a) vertical velocity and wind vectors, (b) zonal wind and wind vectors, and (c) meridional wind  averaged between 138 and 158N for November from ERA-Interim. (d)–(f) The corresponding biases from the AMIP simulation.
    Song X.L, Zhang GJ.  2019.  Culprit of the Eastern Pacific Double-ITCZ Bias in the NCAR CESM1.2. 32:6349-6364.
    Abstract Summary:

    The eastern Pacific double-ITCZ bias has long been attributed to the warm bias of SST in the southeastern Pacific and associated local air-sea interaction. In this study, we conducted two simulations using the NCAR CESM1.2.1 to demonstrate that significant double-ITCZ bias can still form in the eastern Pacific through air-sea coupled feedback even when there is cold SST bias in the southeastern Pacific, indicating that other nonlocal culprits...

  • Adusumilli S., Borsa A.A, Fish M.A, McMillan H.K, Silverii F..  2019.  A decade of water storage changes across the contiguous United States From GPS and satellite gravity.
    Abstract Summary:

    Increased climate variability is driving changes in water storage across the contiguous United States (CONUS). Observational estimates of these storage changes are important for validation of hydrological models and predicting future water availability. We estimate CONUS terrestrial water storage anomalies (TWSA) from 2007-2017 using Global Positioning System (GPS) displacements, constrained by lower-resolution TWSA observations from Gravity...

  • Roemmich D., Sherman J.T, Davis R.E, Grindley K., McClune M., Parker C.J, Black D.N, Zilberman N., Purkey S.G, Sutton P.JH et al..  2019.  Deep SOLO: A full-depth profiling float for the Argo Program. 36:1967-1981.
    Abstract Summary:

    Deployment of Deep Argo regional pilot arrays is underway as a step toward a global array of 1250 surface-to-bottom profiling floats embedded in the upper-ocean (2000 m) Argo Program. Of the 80 active Deep Argo floats as of July 2019, 55 are Deep Sounding Oceanographic Lagrangian Observer (SOLO) 6000-m instruments, and the rest are composed of three additional models profiling to either 4000 or 6000 m. Early success of the Deep SOLO is owed...

  • Wang W.B, Ni H.Y, Su L., Hu T., Ren Q.Y, Gerstoft P, Ma L..  2019.  Deep transfer learning for source ranging: Deep-sea experiment results. 146:EL317-EL322.
    Abstract Summary:

    A deep transfer learning for underwater source ranging is proposed, which migrates the predictive ability obtained from synthetic environment (source domain) into an experimental sea area (target domain). A deep neural network is first trained on large synthetic datasets generated from historical environmental data, and then part of the neural network is refined on collected data set for source ranging. Its performance is tested on a deep-sea...

  • Boudreau P.D, Miller B.W, McCall L.I, Almaliti J., Reher R., Hirata K., Le T., Siqueira-Neto J.L, Hook V., Gerwick WH.  2019.  Design of Gallinamide A analogs as potent inhibitors of the cysteine proteases human Cathepsin L and Trypanosoma cruzi Cruzain. 62:9026-9044.
    Abstract Summary:

    Gallinamide A, originally isolated with a modest antimalarial activity, was subsequently reisolated and characterized as a potent, selective, and irreversible inhibitor of the human cysteine protease cathepsin L. Molecular docking identified potential modifications to improve binding, which were synthesized as a suite of analogs. Resultingly, this current study produced the most potent gallinamide analog yet tested against cathepsin L (10, K-...

  • Cornwell G.C, McCluskey C.S, Levin E.JT, Suski KJ, DeMott PJ, Kreidenweis S.M, Prather KA.  2019.  Direct online mass spectrometry measurements of ice nucleating particles at a California coastal site.
    Abstract Summary:

    The formation of ice in clouds can strongly impact cloud properties and precipitation processes during storms, including atmospheric rivers. Sea spray aerosol (SSA) particles are relatively inefficient as ice nucleating particles (INPs) compared to mineral dust. However, due to the vast coverage of the Earth's surface by the oceans, a number of recent studies have focused on identifying sources of marine INPs, particularly in regions lacking...

  • Abstract Summary:

    The Southern Ocean and coastal Antarctica provide a variety of ecosystem services with benefits for humankind that are of regional and global importance. Despite being nearly uninhabited, increasing exploitation of natural resources, a growing human presence, and environmental change threaten the sustained provisioning of these services. Ecosystem service assessments have proven as a suitable tool to understand the relevance of ecosystems for...

  • Lu R., Stern L.A, Frane W.LDu, Pinkston J.C, Roberts J.J, Constable S.  2019.  The effect of brine on the electrical properties of methane hydrate.
    Abstract Summary:

    Gas hydrates possess lower electrical conductivity (inverse of resistivity) than either seawater or ice, but higher than clastic silts and sands, such that electromagnetic methods can be employed to help identify their natural formation in marine and permafrost environments. Controlled laboratory studies offer a means to isolate and quantify the effects of changing individual components within gas-hydrate-bearing systems, in turn yielding...

  • Abstract Summary:

    The North Pacific subtropical mode water (STMW) often displays a "multicore structure" with more than one minimum in the vertical potential vorticity profile. Anticyclonic eddies (AEs) play an important role in STMW formation and transport, but their effect on the multicore structure of the STMW has not been fully studied. Here, we investigated the formation and evolution of STMW multicore structures in AEs using Argo profiles, which followed...

  • Abstract Summary:

    Objectively determining the level of ecosystem model complexity necessary to achieve meaningful representations of biogeochemical cycles at different spatial and temporal scales is an outstanding issue in marine ecosystem modeling. As part of the development of a three-dimensional (3D) Regional Ocean Modelling System (ROMS) application for the northwest North Atlantic Ocean, we compare model results from three alternative ecosystem model...

  • Courtney T.A, Andersson AJ.  2019.  Evaluating measurements of coral reef net ecosystem calcification rates. 38:997-1006.
    Abstract Summary:

    Monitoring the rates and drivers of coral reef net ecosystem calcification (NEC) under anthropogenic environmental change is critical for predicting associated changes in reef structures and ecosystem services. However, NEC studies to date show weak agreement between studies and notably reveal no relationship between NEC and benthic calcifier cover. In this study, we tested for the sensitivity of calculated NEC to uncertainties in seawater...

  • Smith SR, Dupont CL, McCarthy JK, Broddrick JT, Oborník M, Horák A, Füssy Z, Cihlář J, Kleessen S, Zheng H et al..  2019.  Evolution and regulation of nitrogen flux through compartmentalized metabolic networks in a marine diatom. 10:4552.
    Abstract Summary:

    Diatoms outcompete other phytoplankton for nitrate, yet little is known about the mechanisms underpinning this ability. Genomes and genome-enabled studies have shown that diatoms possess unique features of nitrogen metabolism however, the implications for nutrient utilization and growth are poorly understood. Using a combination of transcriptomics, proteomics, metabolomics, fluxomics, and flux balance analysis to examine short-term shifts in...

  • Prenni A.J, Hand J.L, Malm W.C, Copeland S., Luo G, Yu F, Taylor N., Russell LM, Schichtel B.A.  2019.  An examination of the algorithm for estimating light extinction from IMPROVE particle speciation data. 214
    Abstract Summary:

    The Interagency Monitoring of Protected Visual Environments (IMPROVE) network is the basis for monitoring visibility in Class I Areas throughout the United States. Monitoring is conducted by collecting PM2.5 and PM10 samples every third day at over 150 remote and rural sites nationwide, with PM2.5 samples being analyzed for chemical composition. Light extinction is reconstructed using an algorithm that relates speciated mass to light...

  • Wang J.A, Sulla-Menashe D., Woodcock C.E, Sonnentag O., Keeling RF, Friedl M.A.  2019.  Extensive land cover change across Arctic-Boreal Northwestern North America from disturbance and climate forcing.
    Abstract Summary:

    A multitude of disturbance agents, such as wildfires, land use, and climate-driven expansion of woody shrubs, is transforming the distribution of plant functional types across Arctic-Boreal ecosystems, which has significant implications for interactions and feedbacks between terrestrial ecosystems and climate in the northern high-latitude. However, because the spatial resolution of existing land cover datasets is too coarse, large-scale land...

  • Saliba G., Chen C.L, Lewis S., Russell LM, Rivellini L.H, Lee A.KY, Quinn P.K, Bates T.S, Haentjens N., Boss E.S et al..  2019.  Factors driving the seasonal and hourly variability of sea-spray aerosol number in the North Atlantic. 116:20309-20314.
    Abstract Summary:

    Four North Atlantic Aerosol and Marine Ecosystems Study (NAAMES) field campaigns from winter 2015 through spring 2018 sampled an extensive set of oceanographic and atmospheric parameters during the annual phytoplankton bloom cycle. This unique dataset provides four seasons of open-ocean observations of wind speed, sea surface temperature (SST), seawater particle attenuation at 660 nm (c(p,660), a measure of ocean particulate organic carbon),...

  • Zgliczynski B.J, Williams GJ, Hamilton S.L, Cordner E.G, Fox M.D, Eynaud Y., Michener R.H, Kaufman L.S, Sandin SA.  2019.  Foraging consistency of coral reef fishes across environmental gradients in the central Pacific. 191:433-445.
    Abstract Summary:

    We take advantage of a natural gradient of human exploitation and oceanic primary production across five central Pacific coral reefs to examine foraging patterns in common coral reef fishes. Using stomach content and stable isotope (delta N-15 and delta C-13) analyses, we examined consistency across islands in estimated foraging patterns. Surprisingly, species within the piscivore-invertivore group exhibited the clearest pattern of foraging...

  • Hormann V., Centurioni LR, Gordon A.L.  2019.  Freshwater export pathways from the Bay of Bengal. 168
    Abstract Summary:

    Observations from surface drifters and Argo floats elucidate details of two upper-ocean pathways through which freshwater from the Bay of Bengal (BoB) is advected into the tropical Indian Ocean and Arabian Sea (AS). The western route is located along the east coast of India and feeds into the westward Northeast Monsoon Current (NMC) south of Sri Lanka during the winter monsoon, whereas the eastern path is located along the western margin of...

  • Hennon T.D, Alford MH, Zhao Z.X.  2019.  Global assessment of semidiurnal internal tide aliasing in Argo profiles. 49:2523-2533.
    Abstract Summary:

    Though unresolved by Argo floats, internal waves still impart an aliased signal onto their profile measurements. Recent studies have yielded nearly global characterization of several constituents of the stationary internal tides. Using this new information in conjunction with thousands of floats, we quantify the influence of the stationary, mode-1 M-2 and S-2 internal tides on Argo-observed temperature. We calculate the in situ temperature...

  • Tozer B., Sandwell DT, Smith W.HF, Olson C., Beale J.R, Wessel P..  2019.  Global bathymetry and topography at 15 arc sec: SRTM15+. 6:1847-1864.
    Abstract Summary:

    An updated global bathymetry and topography grid is presented using a spatial sampling interval of 15 arc sec. The bathymetry is produced using a combination of shipboard soundings and depths predicted using satellite altimetry. New data consists of >33.6 million multibeam and singlebeam measurements collated by several institutions, namely, the National Geospatial-Intelligence Agency, Japan Agency for Marine-Earth Science and Technology,...

  • Asselin O., Young W.R.  2019.  An improved model of near-inertial wave dynamics. 876:428-448.
    Abstract Summary:

    The YBJ equation (Young & Ben Jelloul, J. Marine Res., vol. 55, 1997, pp. 735-766) provides a phase-averaged description of the propagation of near-inertial waves (NIWs) through a geostrophic flow. YBJ is obtained via an asymptotic expansion based on the limit , where is the Burger number of the NIWs. Here we develop an improved version, the YBJ(+) equation. In common with an earlier improvement proposed by Thomas, Smith & Buhler (J....

  • Chapman W.E, Subramanian AC, L. Monache D, Xie SP, Ralph FM.  2019.  Improving atmospheric river forecasts with machine learning.
    Abstract Summary:

    This study tests the utility of convolutional neural networks as a postprocessing framework for improving the National Center for Environmental Prediction's Global Forecast System's integrated vapor transport forecast field in the Eastern Pacific and western United States. Integrated vapor transport is the characteristic field of atmospheric rivers, which provide over 65% of yearly precipitation at some western U.S. locations. The method...

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