δ13C decreases in the upper western South Atlantic during Heinrich Stadials 3 and 2

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 (δ13C), i.e. δ13CO2atm, presumably due to outgassing from the oce...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Campos, M.C., Chiessi, C.M., Voigt, I., Piola, A.R., Kuhnert, H., Mulitza, S.
Formato: JOUR
Materias:
air-sea interaction
atmospheric gas
biological pump
climate variation
deep water ventilation
gas exchange
Heinrich event
isotopic ratio
last deglaciation
planktonic foraminifera
stable isotope
temporal evolution
Atlantic Ocean
Atlantic Ocean (North)
Atlantic Ocean (South)
Southern Ocean
Foraminifera
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_18149324_v13_n4_p345_Campos
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_18149324_v13_n4_p345_Campos
record_format dspace
spelling todo:paper_18149324_v13_n4_p345_Campos2023-10-03T16:33:01Z δ13C decreases in the upper western South Atlantic during Heinrich Stadials 3 and 2 Campos, M.C. Chiessi, C.M. Voigt, I. Piola, A.R. Kuhnert, H. Mulitza, S. air-sea interaction atmospheric gas biological pump climate variation deep water ventilation gas exchange Heinrich event isotopic ratio last deglaciation planktonic foraminifera stable isotope temporal evolution Atlantic Ocean Atlantic Ocean (North) Atlantic Ocean (South) Southern Ocean Foraminifera 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 (δ13C), i.e. δ13CO2atm, presumably due to outgassing from the ocean. However, information on the preceding Heinrich Stadials during the last glacial period is scarce. Here we present δ13C 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 δ13C decreases are most likely related to millennial-scale periods of weakening of the Atlantic meridional overturning circulation and the consequent increase (decrease) in CO2atm (δ13CO2atm). 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 δ13C 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 δ13C 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. © Author(s) 2017. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_18149324_v13_n4_p345_Campos
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic air-sea interaction
atmospheric gas
biological pump
climate variation
deep water ventilation
gas exchange
Heinrich event
isotopic ratio
last deglaciation
planktonic foraminifera
stable isotope
temporal evolution
Atlantic Ocean
Atlantic Ocean (North)
Atlantic Ocean (South)
Southern Ocean
Foraminifera
spellingShingle air-sea interaction
atmospheric gas
biological pump
climate variation
deep water ventilation
gas exchange
Heinrich event
isotopic ratio
last deglaciation
planktonic foraminifera
stable isotope
temporal evolution
Atlantic Ocean
Atlantic Ocean (North)
Atlantic Ocean (South)
Southern Ocean
Foraminifera
Campos, M.C.
Chiessi, C.M.
Voigt, I.
Piola, A.R.
Kuhnert, H.
Mulitza, S.
δ13C decreases in the upper western South Atlantic during Heinrich Stadials 3 and 2
topic_facet air-sea interaction
atmospheric gas
biological pump
climate variation
deep water ventilation
gas exchange
Heinrich event
isotopic ratio
last deglaciation
planktonic foraminifera
stable isotope
temporal evolution
Atlantic Ocean
Atlantic Ocean (North)
Atlantic Ocean (South)
Southern Ocean
Foraminifera
description 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 (δ13C), i.e. δ13CO2atm, presumably due to outgassing from the ocean. However, information on the preceding Heinrich Stadials during the last glacial period is scarce. Here we present δ13C 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 δ13C decreases are most likely related to millennial-scale periods of weakening of the Atlantic meridional overturning circulation and the consequent increase (decrease) in CO2atm (δ13CO2atm). 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 δ13C 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 δ13C 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. © Author(s) 2017.
format JOUR
author Campos, M.C.
Chiessi, C.M.
Voigt, I.
Piola, A.R.
Kuhnert, H.
Mulitza, S.
author_facet Campos, M.C.
Chiessi, C.M.
Voigt, I.
Piola, A.R.
Kuhnert, H.
Mulitza, S.
author_sort Campos, M.C.
title δ13C decreases in the upper western South Atlantic during Heinrich Stadials 3 and 2
title_short δ13C decreases in the upper western South Atlantic during Heinrich Stadials 3 and 2
title_full δ13C decreases in the upper western South Atlantic during Heinrich Stadials 3 and 2
title_fullStr δ13C decreases in the upper western South Atlantic during Heinrich Stadials 3 and 2
title_full_unstemmed δ13C decreases in the upper western South Atlantic during Heinrich Stadials 3 and 2
title_sort δ13c decreases in the upper western south atlantic during heinrich stadials 3 and 2
url http://hdl.handle.net/20.500.12110/paper_18149324_v13_n4_p345_Campos
work_keys_str_mv AT camposmc d13cdecreasesintheupperwesternsouthatlanticduringheinrichstadials3and2
AT chiessicm d13cdecreasesintheupperwesternsouthatlanticduringheinrichstadials3and2
AT voigti d13cdecreasesintheupperwesternsouthatlanticduringheinrichstadials3and2
AT piolaar d13cdecreasesintheupperwesternsouthatlanticduringheinrichstadials3and2
AT kuhnerth d13cdecreasesintheupperwesternsouthatlanticduringheinrichstadials3and2
AT mulitzas d13cdecreasesintheupperwesternsouthatlanticduringheinrichstadials3and2
_version_ 1782024082682806272

Ejemplares similares