Glacial warming in the Eastern Pacific Warm Pool
The Eastern Pacific Warm Pool (EPWP) modulates global climate through its connection with tropical Pacific circulation, but sparse paleoceanographic data from this region limits our understanding of its role in past climate variability. We present a 144 kyr alkenone-sea surface temperature (SST) rec...
Published in: | Geophysical Research Letters |
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Language: | English |
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2022
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Online Access: | https://doi.org/10.1029/2022GL098830 |
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ftncar:oai:drupal-site.org:articles_25411 2024-04-28T08:24:56+00:00 Glacial warming in the Eastern Pacific Warm Pool Meegan Kumar, Dervla (author) Tierney, Jessica E. (author) Bhattacharya, Tripti (author) Zhu, Jiang (author) Murray, James W. (author) 2022-05-28 https://doi.org/10.1029/2022GL098830 en eng Geophysical Research Letters--Geophysical Research Letters--0094-8276--1944-8007 articles:25411 doi:10.1029/2022GL098830 ark:/85065/d7280cbj Copyright 2022 American Geophysical Union article Text 2022 ftncar https://doi.org/10.1029/2022GL098830 2024-04-04T17:34:52Z The Eastern Pacific Warm Pool (EPWP) modulates global climate through its connection with tropical Pacific circulation, but sparse paleoceanographic data from this region limits our understanding of its role in past climate variability. We present a 144 kyr alkenone-sea surface temperature (SST) reconstruction from core NH22P, located in the northern EPWP, that shows local warming occurred during periods of global cooling. Climate model simulations of the Last Glacial Maximum indicate that both ice sheet and greenhouse gas forcing slowed wind speeds over the EPWP, which attenuated glacial cooling of local SST via the wind-evaporation-SST feedback. Spectral analysis further suggests precessional pacing of the warming spikes. Vernal equinox insolation could explain this pacing as direct shortwave heating during boreal spring would have contributed to the early seasonal intensification of the EPWP. This work provides crucial constraints on tropical Pacific glacial climate variability and highlights the unique response of the EPWP to global climate forcings. Article in Journal/Newspaper Ice Sheet OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Geophysical Research Letters 49 10 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
The Eastern Pacific Warm Pool (EPWP) modulates global climate through its connection with tropical Pacific circulation, but sparse paleoceanographic data from this region limits our understanding of its role in past climate variability. We present a 144 kyr alkenone-sea surface temperature (SST) reconstruction from core NH22P, located in the northern EPWP, that shows local warming occurred during periods of global cooling. Climate model simulations of the Last Glacial Maximum indicate that both ice sheet and greenhouse gas forcing slowed wind speeds over the EPWP, which attenuated glacial cooling of local SST via the wind-evaporation-SST feedback. Spectral analysis further suggests precessional pacing of the warming spikes. Vernal equinox insolation could explain this pacing as direct shortwave heating during boreal spring would have contributed to the early seasonal intensification of the EPWP. This work provides crucial constraints on tropical Pacific glacial climate variability and highlights the unique response of the EPWP to global climate forcings. |
author2 |
Meegan Kumar, Dervla (author) Tierney, Jessica E. (author) Bhattacharya, Tripti (author) Zhu, Jiang (author) Murray, James W. (author) |
format |
Article in Journal/Newspaper |
title |
Glacial warming in the Eastern Pacific Warm Pool |
spellingShingle |
Glacial warming in the Eastern Pacific Warm Pool |
title_short |
Glacial warming in the Eastern Pacific Warm Pool |
title_full |
Glacial warming in the Eastern Pacific Warm Pool |
title_fullStr |
Glacial warming in the Eastern Pacific Warm Pool |
title_full_unstemmed |
Glacial warming in the Eastern Pacific Warm Pool |
title_sort |
glacial warming in the eastern pacific warm pool |
publishDate |
2022 |
url |
https://doi.org/10.1029/2022GL098830 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
Geophysical Research Letters--Geophysical Research Letters--0094-8276--1944-8007 articles:25411 doi:10.1029/2022GL098830 ark:/85065/d7280cbj |
op_rights |
Copyright 2022 American Geophysical Union |
op_doi |
https://doi.org/10.1029/2022GL098830 |
container_title |
Geophysical Research Letters |
container_volume |
49 |
container_issue |
10 |
_version_ |
1797584926496784384 |