SwePub
Sök i LIBRIS databas

  Extended search

onr:"swepub:oai:DiVA.org:su-187876"
 

Search: onr:"swepub:oai:DiVA.org:su-187876" > A Warm, Stratified,...

  • 1 of 1
  • Previous record
  • Next record
  •    To hitlist
  • Cramwinckel, Margot J. (author)

A Warm, Stratified, and Restricted Labrador Sea Across the Middle Eocene and Its Climatic Optimum

  • Article/chapterEnglish2020

Publisher, publication year, extent ...

  • 2020
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:su-187876
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-187876URI
  • https://doi.org/10.1029/2020PA003932DOI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • Several studies indicate that North Atlantic Deep Water (NADW) formation might have initiated during the globally warm Eocene (56–34 Ma). However, constraints on Eocene surface ocean conditions in source regions presently conducive to deep water formation are sparse. Here we test whether ocean conditions of the middle Eocene Labrador Sea might have allowed for deep water formation by applying (organic) geochemical and palynological techniques, on sediments from Ocean Drilling Program (ODP) Site 647. We reconstruct a long‐term sea surface temperature (SST) drop from ~30°C to ~27°C between 41.5 to 38.5 Ma, based on TEX86. Superimposed on this trend, we record ~2°C warming in SST associated with the Middle Eocene Climatic Optimum (MECO; ~40 Ma), which is the northernmost MECO record as yet, and another, likely regional, warming phase at ~41.1 Ma, associated with low‐latitude planktic foraminifera and dinoflagellate cyst incursions. Dinoflagellate cyst assemblages together with planktonic foraminiferal stable oxygen isotope ratios overall indicate low surface water salinities and strong stratification. Benthic foraminifer stable carbon and oxygen isotope ratios differ from global deep ocean values by 1–2‰ and 2–4‰, respectively, indicating geographic basin isolation. Our multiproxy reconstructions depict a consistent picture of relatively warm and fresh but also highly variable surface ocean conditions in the middle Eocene Labrador Sea. These conditions were unlikely conducive to deep water formation. This implies either NADW did not yet form during the middle Eocene or it formed in a different source region and subsequently bypassed the southern Labrador Sea.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Coxall, Helen K.Stockholms universitet,Institutionen för geologiska vetenskaper(Swepub:su)hcoxa (author)
  • Śliwińska, Kasia K. (author)
  • Polling, Marcel (author)
  • Harper, Dustin T. (author)
  • Bijl, Peter K. (author)
  • Brinkhuis, Henk (author)
  • Eldrett, James S. (author)
  • Houben, Alexander J. P. (author)
  • Peterse, Francien (author)
  • Schouten, Stefan (author)
  • Reichart, Gert-Jan (author)
  • Zachos, James C. (author)
  • Sluijs, Appy (author)
  • Stockholms universitetInstitutionen för geologiska vetenskaper (creator_code:org_t)

Related titles

  • In:Paleoceanography and Paleoclimatology35:102572-45172572-4525

Internet link

Find in a library

To the university's database

  • 1 of 1
  • Previous record
  • Next record
  •    To hitlist

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Close

Copy and save the link in order to return to this view