The impact of ICE‐6G ice sheet topography in the oceanic carbonate system
Abstract During the Last Glacial Maximum (approximately 21 ka BP) the presence of large ice sheets over the Northern Hemisphere (NH) caused significant changes in the ocean–atmosphere interaction. Remarkable changes are noticed in NH both topography and atmospheric CO 2 levels. This paper investigat...
Published in: | International Journal of Climatology |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2023
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/joc.8236 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.8236 |
id |
crwiley:10.1002/joc.8236 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/joc.8236 2024-06-02T08:08:21+00:00 The impact of ICE‐6G ice sheet topography in the oceanic carbonate system Leonardo, Noele Franchi Casagrande, Fernanda Justino, Flavio Barbosa 2023 http://dx.doi.org/10.1002/joc.8236 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.8236 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 43, issue 14, page 6799-6820 ISSN 0899-8418 1097-0088 journal-article 2023 crwiley https://doi.org/10.1002/joc.8236 2024-05-03T10:40:35Z Abstract During the Last Glacial Maximum (approximately 21 ka BP) the presence of large ice sheets over the Northern Hemisphere (NH) caused significant changes in the ocean–atmosphere interaction. Remarkable changes are noticed in NH both topography and atmospheric CO 2 levels. This paper investigates the impact of the most recent paleotopography (ICE6G) in the Earth's climate and the oceanic carbonate system, based on a series of experiments conducted with the oceanic‐atmosphere‐vegetation‐ice‐carbon model, UVic ESCM. Results indicate enhanced cooling in northern North America in the ICE6G compared to the ICE4G simulation due to the lapse rate effect. The decrease of −24°C in the surface temperature in the ICE6G relative to the present day (PD) led to a modification of the atmospheric circulation in the Atlantic and North Pacific regions. Positive and negative anomalies vary widely for the E–P (evaporation–precipitation) flux pattern, but colder and drier atmosphere leads to a reduction in precipitation in the ICE6G experiment. Changes in wind stress between ICE6G and PD induce low temperatures in the Northern Hemisphere. These features are related changes of Ekman's transport and evaporative cooling resulting in positive anomalies of SST. Thus, changes in sea surface temperature and salinity (SST, SSS), and E–P flux led to modifications in the oceanic carbonate system, resulting in an overall increase of total alkalinity and a reduction in the concentrations of total carbon dioxide (TCO 2 ) in the ICE6G with respect to the PD values. This is a consequence of the low concentration of glacial CO 2 and increment in concentrations. The total alkalinity (TA) and TCO 2 do not show a similar response to the SST and SSS, in the sense that larger departures from the PD are found in the Pacific equatorial region, which are affected by changes in water dilution as a result of precipitation and evaporation processes. Article in Journal/Newspaper Ice Sheet Wiley Online Library Pacific International Journal of Climatology |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract During the Last Glacial Maximum (approximately 21 ka BP) the presence of large ice sheets over the Northern Hemisphere (NH) caused significant changes in the ocean–atmosphere interaction. Remarkable changes are noticed in NH both topography and atmospheric CO 2 levels. This paper investigates the impact of the most recent paleotopography (ICE6G) in the Earth's climate and the oceanic carbonate system, based on a series of experiments conducted with the oceanic‐atmosphere‐vegetation‐ice‐carbon model, UVic ESCM. Results indicate enhanced cooling in northern North America in the ICE6G compared to the ICE4G simulation due to the lapse rate effect. The decrease of −24°C in the surface temperature in the ICE6G relative to the present day (PD) led to a modification of the atmospheric circulation in the Atlantic and North Pacific regions. Positive and negative anomalies vary widely for the E–P (evaporation–precipitation) flux pattern, but colder and drier atmosphere leads to a reduction in precipitation in the ICE6G experiment. Changes in wind stress between ICE6G and PD induce low temperatures in the Northern Hemisphere. These features are related changes of Ekman's transport and evaporative cooling resulting in positive anomalies of SST. Thus, changes in sea surface temperature and salinity (SST, SSS), and E–P flux led to modifications in the oceanic carbonate system, resulting in an overall increase of total alkalinity and a reduction in the concentrations of total carbon dioxide (TCO 2 ) in the ICE6G with respect to the PD values. This is a consequence of the low concentration of glacial CO 2 and increment in concentrations. The total alkalinity (TA) and TCO 2 do not show a similar response to the SST and SSS, in the sense that larger departures from the PD are found in the Pacific equatorial region, which are affected by changes in water dilution as a result of precipitation and evaporation processes. |
format |
Article in Journal/Newspaper |
author |
Leonardo, Noele Franchi Casagrande, Fernanda Justino, Flavio Barbosa |
spellingShingle |
Leonardo, Noele Franchi Casagrande, Fernanda Justino, Flavio Barbosa The impact of ICE‐6G ice sheet topography in the oceanic carbonate system |
author_facet |
Leonardo, Noele Franchi Casagrande, Fernanda Justino, Flavio Barbosa |
author_sort |
Leonardo, Noele Franchi |
title |
The impact of ICE‐6G ice sheet topography in the oceanic carbonate system |
title_short |
The impact of ICE‐6G ice sheet topography in the oceanic carbonate system |
title_full |
The impact of ICE‐6G ice sheet topography in the oceanic carbonate system |
title_fullStr |
The impact of ICE‐6G ice sheet topography in the oceanic carbonate system |
title_full_unstemmed |
The impact of ICE‐6G ice sheet topography in the oceanic carbonate system |
title_sort |
impact of ice‐6g ice sheet topography in the oceanic carbonate system |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1002/joc.8236 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.8236 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
International Journal of Climatology volume 43, issue 14, page 6799-6820 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.8236 |
container_title |
International Journal of Climatology |
_version_ |
1800753567878873088 |