FN Archimer Export Format
PT J
TI δ13C decreases in the upper western South Atlantic during Heinrich Stadials 3 and 2
BT 
AF CAMPOS, Marilia C.
   CHIESSI, Cristiano M.
   VOIGT, Ines
   PIOLA, Alberto R.
   KUHNERT, Henning
   MULITZA, Stefan
AS 1:1;2:1;3:2;4:3,4,5;5:2;6:2;
FF 1:;2:;3:;4:;5:;6:;
C1 Univ Sao Paulo, Sch Arts Sci & Humanities, BR-03828000 Sao Paulo, Brazil.
   Univ Bremen, MARUM Ctr Marine Environm Sci, D-28359 Bremen, Germany.
   Serv Hidrog Naval, C1270ABV, Buenos Aires, DF, Argentina.
   Univ Buenos Aires, FCEN, Dept Ciencias Atmosfera & Oceanos, C1428 EHA, Buenos Aires, DF, Argentina.
   Consejo Nacl Invest Cient & Tecn, CNRS, Inst Franco Argentino Estudios Clima & Sus Impact, C1428EGA, Buenos Aires, DF, Argentina.
C2 UNIV SAO PAULO, BRAZIL
   UNIV BREMEN, GERMANY
   SHN, ARGENTINA
   UNIV BUENOS AIRES, ARGENTINA
   CONICET, ARGENTINA
IN DOAJ
IF 3.174
TC 10
UR https://archimer.ifremer.fr/doc/00420/53162/55294.pdf
   https://archimer.ifremer.fr/doc/00420/53162/55295.pdf
LA English
DT Article
CR IMAGES 1-MD101
   IMAGES V LEG 1-MD114
   IMAGES V LEG 4-MD114
   MD 132 / P.I.C.A.S.S.O.-IMAGES11
BO Marion Dufresne
AB Abrupt millennial-scale climate change events of the last deglaciation (i.e. Heinrich Stadial 1 and the Younger Dryas) were accompanied by marked increases in atmospheric CO2 (CO2atm) and decreases in its stable carbon isotopic ratios (delta C-13), i.e. delta(CO2atm)-C-13, presumably due to out-gassing from the ocean. However, information on the preceding Heinrich Stadials during the last glacial period is scarce. Here we present delta C-13 records from two species of planktonic foraminifera from the western South Atlantic that reveal major decreases (up to 1%) during Heinrich Stadials 3 and 2. These delta C-13 decreases are most likely related to millennial-scale periods of weakening of the Atlantic meridional overturning circulation and the consequent increase (decrease) in CO2atm (delta(CO2atm)-C-13). We hypothesise two mechanisms that could account for the decreases observed in our records, namely strengthening of Southern Ocean deep-water ventilation and weakening of the biological pump. Additionally, we suggest that air-sea gas exchange could have contributed to the observed delta C-13 decreases. Together with other lines of evidence, our data are consistent with the hypothesis that the CO2 added to the atmosphere during abrupt millennial-scale climate change events of the last glacial period also originated in the ocean and reached the atmosphere by outgassing. The temporal evolution of delta C-13 during Heinrich Stadials 3 and 2 in our records is characterized by two relative minima separated by a relative maximum. This "w structure" is also found in North Atlantic and South American records, further suggesting that such a structure is a pervasive feature of Heinrich Stadial 2 and, possibly, also Heinrich Stadial 3. 
PY 2017
PD APR
SO Climate Of The Past
SN 1814-9324
PU Copernicus Gesellschaft Mbh
VL 13
IS 4
UT 000399752700001
BP 345
EP 358
DI 10.5194/cp-13-345-2017
ID 53162
ER

EF