Exceptionally high biosphere productivity at the beginning of Marine Isotopic Stage 11
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Exceptionally high biosphere productivity at the beginning of Marine Isotopic Stage 11. / Brandon, Margaux; Landais, Amaelle; Duchamp-Alphonse, Stephanie; Favre, Violaine; Schmitz, Lea; Abrial, Heloise; Prie, Frederic; Extier, Thomas; Blunier, Thomas.
I: Nature Communications, Bind 11, Nr. 1, 2112, 30.04.2020.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Exceptionally high biosphere productivity at the beginning of Marine Isotopic Stage 11
AU - Brandon, Margaux
AU - Landais, Amaelle
AU - Duchamp-Alphonse, Stephanie
AU - Favre, Violaine
AU - Schmitz, Lea
AU - Abrial, Heloise
AU - Prie, Frederic
AU - Extier, Thomas
AU - Blunier, Thomas
PY - 2020/4/30
Y1 - 2020/4/30
N2 - Significant changes in atmospheric CO2 over glacial-interglacial cycles have mainly been attributed to the Southern Ocean through physical and biological processes. However, little is known about the contribution of global biosphere productivity, associated with important CO2 fluxes. Here we present the first high resolution record of Delta O-17 of O-2 in the Antarctic EPICA Dome C ice core over Termination V and Marine Isotopic Stage (MIS) 11 and reconstruct the global oxygen biosphere productivity over the last 445 ka. Our data show that compared to the younger terminations, biosphere productivity at the end of Termination V is 10 to 30 % higher. Comparisons with local palaeo observations suggest that strong terrestrial productivity in a context of low eccentricity might explain this pattern. We propose that higher biosphere productivity could have maintained low atmospheric CO2 at the beginning of MIS 11, thus highlighting its control on the global climate during Termination V. Biosphere productivity is an important component of the CO2 cycle, but how it has varied over past glacial-interglacial cycles is not well known. Here, the authors present new data that shows that global biosphere productivity was 10 to 30% higher during Termination V compared to younger deglaciations.
AB - Significant changes in atmospheric CO2 over glacial-interglacial cycles have mainly been attributed to the Southern Ocean through physical and biological processes. However, little is known about the contribution of global biosphere productivity, associated with important CO2 fluxes. Here we present the first high resolution record of Delta O-17 of O-2 in the Antarctic EPICA Dome C ice core over Termination V and Marine Isotopic Stage (MIS) 11 and reconstruct the global oxygen biosphere productivity over the last 445 ka. Our data show that compared to the younger terminations, biosphere productivity at the end of Termination V is 10 to 30 % higher. Comparisons with local palaeo observations suggest that strong terrestrial productivity in a context of low eccentricity might explain this pattern. We propose that higher biosphere productivity could have maintained low atmospheric CO2 at the beginning of MIS 11, thus highlighting its control on the global climate during Termination V. Biosphere productivity is an important component of the CO2 cycle, but how it has varied over past glacial-interglacial cycles is not well known. Here, the authors present new data that shows that global biosphere productivity was 10 to 30% higher during Termination V compared to younger deglaciations.
KW - BUBBLE CLOSE-OFF
KW - ICE CORE
KW - ANTARCTIC ICE
KW - CHRONOLOGY AICC2012
KW - ATMOSPHERIC OXYGEN
KW - CARBON-DIOXIDE
KW - CLIMATE-CHANGE
KW - TRAPPED GASES
KW - O-2
KW - CO2
U2 - 10.1038/s41467-020-15739-2
DO - 10.1038/s41467-020-15739-2
M3 - Journal article
C2 - 32355168
VL - 11
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
IS - 1
M1 - 2112
ER -
ID: 247542312