Southern Ocean contributions to the Eastern Equatorial Pacific heat content during the Holocene

TitleSouthern Ocean contributions to the Eastern Equatorial Pacific heat content during the Holocene
Publication TypeJournal Article
Year of Publication2015
AuthorsKalansky J., Rosenthal Y., Herbert T., Bova S., Altabet M.
JournalEarth and Planetary Science Letters
Volume424
Pagination158-167
Date Published2015/08
Type of ArticleArticle
ISBN Number0012-821X
Accession NumberWOS:000357223300015
Keywords13-degrees-c water; Antarctic Peninsula; bp; circulation; climate-change; equatorial pacific; holocene; kyr; ocean heat content; paleoceanography; simulated passive tracer; Southern Ocean; temperature; tropical pacific; younger dryas
Abstract

Temperature reconstructions from a shallow core (375 m) from the Peru Margin are used to test the influence of Subantarctic Mode Water (SAMW) on the eastern equatorial Pacific (EEP) thermostad and thus the effect of southern high latitude climate on interior ocean heat content (OHC). Temperature estimates, based on Mg/Ca measurements of planktonic and benthic foraminifera (Neogloboquadrina dutertrei and Uvigerina spp., respectively) show higher temperatures in the early Holocene, a cooling of similar to 2 degrees by 8 kyr B.P. and after relatively stable temperatures to the present. The temperature signal is similar in direction and timing to a rather robust Holocene climate signal from the southern high latitudes suggesting it originated there and was advected to the core site in the EEP. Based on the N. dutertrei and Uvigerina Mg/Ca temperature and delta C-13 records we conclude that SAMW acted as a conduit transporting the southern high latitude climate to the interior of the equatorial Pacific. We propose that the early Holocene warmth is related to a southward migration of the Subtropical Front, which enhanced the influence of warm subtropical water in the region of SAMW formation and was then transported to the EEP thermostad. The early Holocene warmth recorded in the EEP thermostad has a muted sea surface temperature expression indicating this mechanism is important for sequestering heat in the ocean interior. (C) 2015 Elsevier B.V. All rights reserved.

DOI10.1016/j.epsl.2015.05.013
Short TitleEarth Planet. Sci. Lett.
Student Publication: 
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