FN Archimer Export Format
PT J
TI Postglacial paleoceanography of the western Barents Sea: Implications for alkenone-based sea surface temperatures and primary productivity
BT 
AF Łącka, Magdalena
   Cao, Min
   Rosell-Melé, Antoni
   Pawłowska, Joanna
   Kucharska, Małgorzata
   Forwick, Matthias
   Zajączkowski, Marek
AS 1:1;2:2,3;3:3,4;4:1;5:1;6:5;7:1;
FF 1:;2:;3:;4:;5:;6:;7:;
C1 Institute of Oceanology, Polish Academy of Sciences, Powstańców Warszawy 55, 81-712, Sopot, Poland
   Key Laboratory of Karst Environment, School of Geographical Sciences, Southwest University, Chongqing, 400715, China
   Institute of Environmental Science and Technology (ICTA-UAB), Universitat Autònoma de Barcelona, 08193, Bellaterra, Spain
   Institució Catalana de Recerca i Estudis Avançats, 08010 Barcelona, Spain
   Department of Geosciences, UiT The Arctic University of Norway in Tromsø, N-9037, Tromsø, Norway
C2 POLISH ACAD SCI, POLAND
   UNIV SOUTHWEST, CHINA
   UNIV AUTONOMA BARCELONA, SPAIN
   ICREA, SPAIN
   UNIV TROMSO, NORWAY
IF 3.803
TC 12
UR https://archimer.ifremer.fr/doc/00585/69740/67629.pdf
   https://archimer.ifremer.fr/doc/00585/69740/67630.xml
LA English
DT Article
CR IMAGES 1-MD101
BO Marion Dufresne
DE ;Alkenones;Stratification;Holocene;Sea ice decrease;Global warming;North Atlantic Current;Arctic
AB The increasing influence of Atlantic Water (AW) in the Barents Sea, a process known as “Atlantification”, is gradually decreasing sea ice cover in the region. Ongoing global climate warming is likely to be one of its drivers, but to further understand the role of natural variability and the biogeochemical impacts of the inflow of AW into the western Barents Sea, we reconstructed sea surface temperatures (SSTs) and primary productivity in Storfjordrenna, a climatically sensitive area south of Spitsbergen, between approximately 13,950 cal yr BP and 1300 cal yr BP. The alkenone proxy has been applied to reconstruct SSTs, and the alkenone accumulation rate in marine sediments has been used to infer changes in primary productivity. Our data show that the SST increase was concomitant with the progressive loss of sea ice cover and an increase in primary productivity in the western Barents Sea. We interpret these changes as reflecting the increasing influence of AW in the area as the ice sheets retreated in Svalbard. The transition from the Arctic to the Atlantic domain first occurred after 11,500 cal yr BP, as the Arctic Front moved eastward of the study site but with considerable variability in surface ocean conditions. High SSTs at approximately 6400 cal yr BP may have led to limited winter surface cooling, likely inhibiting convective mixing and the return of nutrients to the euphotic zone and/or enhanced organic matter consumption by zooplankton due to an earlier light signal in the ice-free Storfjordrenna. During the late Holocene (3600-1300 cal yr BP), low insolation facilitated sea ice formation and thus brine production. The former may have launched convective water mixing and increased nutrient resupply to the sea surface, consequently enhancing primary productivity in Storfjordrenna. We propose that, on the basis of the paleoceanographic evidence, the modern increasing inflow of warm AW and the disappearance of pack ice on the Eurasian continental shelf are likely to weaken convective water mixing and decrease primary production in the region. 
PY 2019
PD NOV
SO Quaternary Science Reviews
SN 0277-3791
PU Elsevier BV
VL 224
UT 000495488200007
DI 10.1016/j.quascirev.2019.105973
ID 69740
ER

EF