Enhanced tropical methane production in response to iceberg discharge in the North Atlantic
The causal mechanisms responsible for the abrupt climate changes of the Last Glacial Period remain unclear. One major difficulty is dating ice-rafted debris deposits associated with Heinrich events: Extensive iceberg influxes into the North Atlantic Ocean linked to global impacts on climate and biog...
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Language: | English |
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ftcdlib:qt8sm2s5cp 2023-05-15T16:28:37+02:00 Enhanced tropical methane production in response to iceberg discharge in the North Atlantic Rhodes, RH Brook, EJ Chiang, JCH Blunier, T Maselli, OJ McConnell, JR Romanini, D Severinghaus, JP 1016 - 1019 2015-05-29 application/pdf http://www.escholarship.org/uc/item/8sm2s5cp english eng eScholarship, University of California qt8sm2s5cp http://www.escholarship.org/uc/item/8sm2s5cp public Rhodes, RH; Brook, EJ; Chiang, JCH; Blunier, T; Maselli, OJ; McConnell, JR; et al.(2015). Enhanced tropical methane production in response to iceberg discharge in the North Atlantic. Science, 348(6238), 1016 - 1019. doi:10.1126/science.1262005. UC Berkeley: Retrieved from: http://www.escholarship.org/uc/item/8sm2s5cp article 2015 ftcdlib https://doi.org/10.1126/science.1262005 2019-04-12T22:51:47Z The causal mechanisms responsible for the abrupt climate changes of the Last Glacial Period remain unclear. One major difficulty is dating ice-rafted debris deposits associated with Heinrich events: Extensive iceberg influxes into the North Atlantic Ocean linked to global impacts on climate and biogeochemistry. In a new ice core record of atmospheric methane with ultrahigh temporal resolution, we find abrupt methane increases within Heinrich stadials 1, 2, 4, and 5 that, uniquely, have no counterparts in Greenland temperature proxies. Using a heuristic model of tropical rainfall distribution, we propose that Hudson Strait Heinrich events caused rainfall intensification over Southern Hemisphere land areas, thereby producing excess methane in tropical wetlands. Our findings suggest that the climatic impacts of Heinrich events persisted for 740 to 1520 years. Article in Journal/Newspaper Greenland Hudson Strait ice core North Atlantic University of California: eScholarship Greenland Hudson Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) Science 348 6238 1016 1019 |
institution |
Open Polar |
collection |
University of California: eScholarship |
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ftcdlib |
language |
English |
description |
The causal mechanisms responsible for the abrupt climate changes of the Last Glacial Period remain unclear. One major difficulty is dating ice-rafted debris deposits associated with Heinrich events: Extensive iceberg influxes into the North Atlantic Ocean linked to global impacts on climate and biogeochemistry. In a new ice core record of atmospheric methane with ultrahigh temporal resolution, we find abrupt methane increases within Heinrich stadials 1, 2, 4, and 5 that, uniquely, have no counterparts in Greenland temperature proxies. Using a heuristic model of tropical rainfall distribution, we propose that Hudson Strait Heinrich events caused rainfall intensification over Southern Hemisphere land areas, thereby producing excess methane in tropical wetlands. Our findings suggest that the climatic impacts of Heinrich events persisted for 740 to 1520 years. |
format |
Article in Journal/Newspaper |
author |
Rhodes, RH Brook, EJ Chiang, JCH Blunier, T Maselli, OJ McConnell, JR Romanini, D Severinghaus, JP |
spellingShingle |
Rhodes, RH Brook, EJ Chiang, JCH Blunier, T Maselli, OJ McConnell, JR Romanini, D Severinghaus, JP Enhanced tropical methane production in response to iceberg discharge in the North Atlantic |
author_facet |
Rhodes, RH Brook, EJ Chiang, JCH Blunier, T Maselli, OJ McConnell, JR Romanini, D Severinghaus, JP |
author_sort |
Rhodes, RH |
title |
Enhanced tropical methane production in response to iceberg discharge in the North Atlantic |
title_short |
Enhanced tropical methane production in response to iceberg discharge in the North Atlantic |
title_full |
Enhanced tropical methane production in response to iceberg discharge in the North Atlantic |
title_fullStr |
Enhanced tropical methane production in response to iceberg discharge in the North Atlantic |
title_full_unstemmed |
Enhanced tropical methane production in response to iceberg discharge in the North Atlantic |
title_sort |
enhanced tropical methane production in response to iceberg discharge in the north atlantic |
publisher |
eScholarship, University of California |
publishDate |
2015 |
url |
http://www.escholarship.org/uc/item/8sm2s5cp |
op_coverage |
1016 - 1019 |
long_lat |
ENVELOPE(-70.000,-70.000,62.000,62.000) |
geographic |
Greenland Hudson Hudson Strait |
geographic_facet |
Greenland Hudson Hudson Strait |
genre |
Greenland Hudson Strait ice core North Atlantic |
genre_facet |
Greenland Hudson Strait ice core North Atlantic |
op_source |
Rhodes, RH; Brook, EJ; Chiang, JCH; Blunier, T; Maselli, OJ; McConnell, JR; et al.(2015). Enhanced tropical methane production in response to iceberg discharge in the North Atlantic. Science, 348(6238), 1016 - 1019. doi:10.1126/science.1262005. UC Berkeley: Retrieved from: http://www.escholarship.org/uc/item/8sm2s5cp |
op_relation |
qt8sm2s5cp http://www.escholarship.org/uc/item/8sm2s5cp |
op_rights |
public |
op_doi |
https://doi.org/10.1126/science.1262005 |
container_title |
Science |
container_volume |
348 |
container_issue |
6238 |
container_start_page |
1016 |
op_container_end_page |
1019 |
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1766018297166299136 |