Holocene Black Carbon in Antarctica
Abstract: Black carbon (BC) and other biomass-burning (BB) aerosols are critical components of climate forcing but quantification, predictive climate modeling, and policy decisions have been hampered by limited understanding of the climate drivers of BB and by the lack of long-term records. Prior mo...
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IEDA: US Antarctic Program Data Center
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dataone:http://get.iedadata.org/metadata/iso/601034 2024-06-03T18:46:24+00:00 Holocene Black Carbon in Antarctica Mcconnell, Joseph Arienzo, Monica ENVELOPE(161.41425,162.1406,-77.73489,-77.86467) BEGINDATE: 2010-01-01T00:00:00Z ENDDATE: 2013-09-30T00:00:00Z 2017-06-19T00:00:00Z http://get.iedadata.org/metadata/iso/601034 unknown IEDA: US Antarctic Program Data Center Black Carbon Antarctic Glaciology WAIS Divide Ice Core Chemistry:Ice Glaciology Ice Core Records Antarctica Glaciers/Ice Sheet Atmosphere Cryosphere WAIS divide US Antarctic Program Data Center (USAP-DC) Dataset 2017 dataone:urn:node:IEDA_USAP 2024-06-03T18:11:58Z Abstract: Black carbon (BC) and other biomass-burning (BB) aerosols are critical components of climate forcing but quantification, predictive climate modeling, and policy decisions have been hampered by limited understanding of the climate drivers of BB and by the lack of long-term records. Prior modeling studies suggested that increased Northern Hemisphere anthropogenic BC emissions increased recent temperatures and regional precipitation, including a northward shift in the Inter-Tropical Convergence Zone (ITCZ). Two Antarctic ice cores were analyzed for BC and the longest record shows that the highest BC deposition during the Holocene occurred ~8-6k years before present in a period of relatively high austral burning season and low growing season insolation. Atmospheric transport modeling suggests South America (SA) as the dominant source of modern Antarctic BC and, consistent with the ice-core record, climate model experiments using mid-Holocene and preindustrial insolation simulate comparable increases in carbon loss due to fires in SA during the mid-Holocene. SA climate proxies document a northward shifted ITCZ and weakened SA Summer Monsoon (SASM) during this period, with associated impacts on hydroclimate and burning. A second Antarctic ice core spanning the last 2.5k years documents similar linkages between hydroclimate and BC, with the lowest deposition during the Little Ice Age characterized by a southerly shifted ITCZ and strengthened SASM. These new results indicate that insolation-driven changes in SA hydroclimate and BB, likely linked to the position of the ITCZ, modulated Antarctic BC deposition during most of the Holocene and suggests connections and feedbacks between future BC emissions and hydroclimate. Dataset Antarc* Antarctic Antarctica ice core Ice Sheet IEDA: US Antarctic Program Data Center (via DataONE) Antarctic Austral ENVELOPE(161.41425,162.1406,-77.73489,-77.86467) |
institution |
Open Polar |
collection |
IEDA: US Antarctic Program Data Center (via DataONE) |
op_collection_id |
dataone:urn:node:IEDA_USAP |
language |
unknown |
topic |
Black Carbon Antarctic Glaciology WAIS Divide Ice Core Chemistry:Ice Glaciology Ice Core Records Antarctica Glaciers/Ice Sheet Atmosphere Cryosphere WAIS divide US Antarctic Program Data Center (USAP-DC) |
spellingShingle |
Black Carbon Antarctic Glaciology WAIS Divide Ice Core Chemistry:Ice Glaciology Ice Core Records Antarctica Glaciers/Ice Sheet Atmosphere Cryosphere WAIS divide US Antarctic Program Data Center (USAP-DC) Mcconnell, Joseph Arienzo, Monica Holocene Black Carbon in Antarctica |
topic_facet |
Black Carbon Antarctic Glaciology WAIS Divide Ice Core Chemistry:Ice Glaciology Ice Core Records Antarctica Glaciers/Ice Sheet Atmosphere Cryosphere WAIS divide US Antarctic Program Data Center (USAP-DC) |
description |
Abstract: Black carbon (BC) and other biomass-burning (BB) aerosols are critical components of climate forcing but quantification, predictive climate modeling, and policy decisions have been hampered by limited understanding of the climate drivers of BB and by the lack of long-term records. Prior modeling studies suggested that increased Northern Hemisphere anthropogenic BC emissions increased recent temperatures and regional precipitation, including a northward shift in the Inter-Tropical Convergence Zone (ITCZ). Two Antarctic ice cores were analyzed for BC and the longest record shows that the highest BC deposition during the Holocene occurred ~8-6k years before present in a period of relatively high austral burning season and low growing season insolation. Atmospheric transport modeling suggests South America (SA) as the dominant source of modern Antarctic BC and, consistent with the ice-core record, climate model experiments using mid-Holocene and preindustrial insolation simulate comparable increases in carbon loss due to fires in SA during the mid-Holocene. SA climate proxies document a northward shifted ITCZ and weakened SA Summer Monsoon (SASM) during this period, with associated impacts on hydroclimate and burning. A second Antarctic ice core spanning the last 2.5k years documents similar linkages between hydroclimate and BC, with the lowest deposition during the Little Ice Age characterized by a southerly shifted ITCZ and strengthened SASM. These new results indicate that insolation-driven changes in SA hydroclimate and BB, likely linked to the position of the ITCZ, modulated Antarctic BC deposition during most of the Holocene and suggests connections and feedbacks between future BC emissions and hydroclimate. |
format |
Dataset |
author |
Mcconnell, Joseph Arienzo, Monica |
author_facet |
Mcconnell, Joseph Arienzo, Monica |
author_sort |
Mcconnell, Joseph |
title |
Holocene Black Carbon in Antarctica |
title_short |
Holocene Black Carbon in Antarctica |
title_full |
Holocene Black Carbon in Antarctica |
title_fullStr |
Holocene Black Carbon in Antarctica |
title_full_unstemmed |
Holocene Black Carbon in Antarctica |
title_sort |
holocene black carbon in antarctica |
publisher |
IEDA: US Antarctic Program Data Center |
publishDate |
2017 |
url |
http://get.iedadata.org/metadata/iso/601034 |
op_coverage |
ENVELOPE(161.41425,162.1406,-77.73489,-77.86467) BEGINDATE: 2010-01-01T00:00:00Z ENDDATE: 2013-09-30T00:00:00Z |
long_lat |
ENVELOPE(161.41425,162.1406,-77.73489,-77.86467) |
geographic |
Antarctic Austral |
geographic_facet |
Antarctic Austral |
genre |
Antarc* Antarctic Antarctica ice core Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica ice core Ice Sheet |
_version_ |
1800873260692275200 |