Abruptly attenuated carbon sequestration with Weddell Sea dense waters towards the end of the 21st century
Antarctic Bottom Water formation, such as in the Weddell Sea, is an efficient vector for carbon sequestration on time scales of centuries. Yet, possible changes in carbon sequestration under changing environmental conditions are unquantified to date, mainly due to difficulties in simulating the rele...
Main Authors: | , , , , |
---|---|
Format: | Conference Object |
Language: | unknown |
Published: |
2022
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/55772/ https://hdl.handle.net/10013/epic.c82345d0-4576-42f9-b79d-435e7f19ac46 |
id |
ftawi:oai:epic.awi.de:55772 |
---|---|
record_format |
openpolar |
spelling |
ftawi:oai:epic.awi.de:55772 2023-05-15T13:45:22+02:00 Abruptly attenuated carbon sequestration with Weddell Sea dense waters towards the end of the 21st century Nissen, Cara Timmermann, Ralph Hoppema, Mario Gurses, Ozgur Hauck, Judith 2022-03-04 https://epic.awi.de/id/eprint/55772/ https://hdl.handle.net/10013/epic.c82345d0-4576-42f9-b79d-435e7f19ac46 unknown Nissen, C. orcid:0000-0001-5804-3191 , Timmermann, R. , Hoppema, M. orcid:0000-0002-2326-619X , Gurses, O. orcid:0000-0002-0646-5760 and Hauck, J. orcid:0000-0003-4723-9652 (2022) Abruptly attenuated carbon sequestration with Weddell Sea dense waters towards the end of the 21st century , Ocean Sciences Meeting, 28 Feb 2022 - 04 March 2022 (online) . hdl:10013/epic.c82345d0-4576-42f9-b79d-435e7f19ac46 EPIC3Ocean Sciences Meeting, 28 Feb 2022 - 04 March 2022 (online) Conference notRev 2022 ftawi 2022-03-14T00:09:43Z Antarctic Bottom Water formation, such as in the Weddell Sea, is an efficient vector for carbon sequestration on time scales of centuries. Yet, possible changes in carbon sequestration under changing environmental conditions are unquantified to date, mainly due to difficulties in simulating the relevant processes on high-latitude continental shelves. Using a model setup including both ice-shelf cavities and oceanic carbon cycling, we demonstrate that by 2100, deep-ocean carbon accumulation in the southern Weddell Sea is abruptly attenuated to only 40% of the rate in the 1990s in a high-emission scenario, while still being 4-fold higher in the 2080s. By assessing deep-ocean carbon budgets and water mass transformations, we show that this decline can be attributed to an increased presence of Warm Deep Water on the southern Weddell Sea continental shelf, a 16% reduction in sea-ice formation, and a 79% increase in ice-shelf basal melt. Altogether, these changes lower the density and volume of newly formed bottom waters and reduce the associated carbon transport to the abyss. Conference Object Antarc* Antarctic Ice Shelf Sea ice Weddell Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Weddell Weddell Sea |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Antarctic Bottom Water formation, such as in the Weddell Sea, is an efficient vector for carbon sequestration on time scales of centuries. Yet, possible changes in carbon sequestration under changing environmental conditions are unquantified to date, mainly due to difficulties in simulating the relevant processes on high-latitude continental shelves. Using a model setup including both ice-shelf cavities and oceanic carbon cycling, we demonstrate that by 2100, deep-ocean carbon accumulation in the southern Weddell Sea is abruptly attenuated to only 40% of the rate in the 1990s in a high-emission scenario, while still being 4-fold higher in the 2080s. By assessing deep-ocean carbon budgets and water mass transformations, we show that this decline can be attributed to an increased presence of Warm Deep Water on the southern Weddell Sea continental shelf, a 16% reduction in sea-ice formation, and a 79% increase in ice-shelf basal melt. Altogether, these changes lower the density and volume of newly formed bottom waters and reduce the associated carbon transport to the abyss. |
format |
Conference Object |
author |
Nissen, Cara Timmermann, Ralph Hoppema, Mario Gurses, Ozgur Hauck, Judith |
spellingShingle |
Nissen, Cara Timmermann, Ralph Hoppema, Mario Gurses, Ozgur Hauck, Judith Abruptly attenuated carbon sequestration with Weddell Sea dense waters towards the end of the 21st century |
author_facet |
Nissen, Cara Timmermann, Ralph Hoppema, Mario Gurses, Ozgur Hauck, Judith |
author_sort |
Nissen, Cara |
title |
Abruptly attenuated carbon sequestration with Weddell Sea dense waters towards the end of the 21st century |
title_short |
Abruptly attenuated carbon sequestration with Weddell Sea dense waters towards the end of the 21st century |
title_full |
Abruptly attenuated carbon sequestration with Weddell Sea dense waters towards the end of the 21st century |
title_fullStr |
Abruptly attenuated carbon sequestration with Weddell Sea dense waters towards the end of the 21st century |
title_full_unstemmed |
Abruptly attenuated carbon sequestration with Weddell Sea dense waters towards the end of the 21st century |
title_sort |
abruptly attenuated carbon sequestration with weddell sea dense waters towards the end of the 21st century |
publishDate |
2022 |
url |
https://epic.awi.de/id/eprint/55772/ https://hdl.handle.net/10013/epic.c82345d0-4576-42f9-b79d-435e7f19ac46 |
geographic |
Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Ice Shelf Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctic Ice Shelf Sea ice Weddell Sea |
op_source |
EPIC3Ocean Sciences Meeting, 28 Feb 2022 - 04 March 2022 (online) |
op_relation |
Nissen, C. orcid:0000-0001-5804-3191 , Timmermann, R. , Hoppema, M. orcid:0000-0002-2326-619X , Gurses, O. orcid:0000-0002-0646-5760 and Hauck, J. orcid:0000-0003-4723-9652 (2022) Abruptly attenuated carbon sequestration with Weddell Sea dense waters towards the end of the 21st century , Ocean Sciences Meeting, 28 Feb 2022 - 04 March 2022 (online) . hdl:10013/epic.c82345d0-4576-42f9-b79d-435e7f19ac46 |
_version_ |
1766222773583085568 |