Antarctic Elevation Drives Hemispheric Asymmetry in Polar Lapse Rate Climatology and Feedback
Thesis (Master's)--University of Washington, 2020 The lapse-rate feedback is the dominant driver of stronger warming in the Arctic than the Antarctic in simulations with increased CO2. While Antarctic surface elevation has been implicated in promoting a weaker Antarctic lapse-rate feedback, the...
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ftunivwashington:oai:digital.lib.washington.edu:1773/46729 2023-05-15T13:56:55+02:00 Antarctic Elevation Drives Hemispheric Asymmetry in Polar Lapse Rate Climatology and Feedback Hahn, Lily Battisti, David Armour, Kyle 2020 application/pdf http://hdl.handle.net/1773/46729 en_US eng Hahn_washington_0250O_22379.pdf http://hdl.handle.net/1773/46729 CC BY Antarctica Arctic atmospheric heat transport climate change lapse rate feedback polar amplification Atmospheric sciences Thesis 2020 ftunivwashington 2023-03-12T19:00:37Z Thesis (Master's)--University of Washington, 2020 The lapse-rate feedback is the dominant driver of stronger warming in the Arctic than the Antarctic in simulations with increased CO2. While Antarctic surface elevation has been implicated in promoting a weaker Antarctic lapse-rate feedback, the mechanisms in which elevation impacts the lapse-rate feedback are still unclear. Here we suggest that weaker Antarctic warming under CO2 forcing stems from shallower, less intense climatological inversions due to limited atmospheric heat transport above the ice sheet elevation and elevation-induced katabatic winds. In slab ocean model experiments with flattened Antarctic topography, stronger climatological inversions support a stronger lapse-rate feedback and annual-mean Antarctic warming comparable to the Arctic under CO2 doubling. Unlike the Arctic, seasonality in warming over flat Antarctica is mainly driven by a negative shortwave cloud feedback which exclusively dampens summer warming, with a smaller contribution from the winter-enhanced lapse-rate feedback. Thesis Antarc* Antarctic Antarctica Arctic Climate change Ice Sheet University of Washington, Seattle: ResearchWorks Antarctic Arctic The Antarctic |
institution |
Open Polar |
collection |
University of Washington, Seattle: ResearchWorks |
op_collection_id |
ftunivwashington |
language |
English |
topic |
Antarctica Arctic atmospheric heat transport climate change lapse rate feedback polar amplification Atmospheric sciences |
spellingShingle |
Antarctica Arctic atmospheric heat transport climate change lapse rate feedback polar amplification Atmospheric sciences Hahn, Lily Antarctic Elevation Drives Hemispheric Asymmetry in Polar Lapse Rate Climatology and Feedback |
topic_facet |
Antarctica Arctic atmospheric heat transport climate change lapse rate feedback polar amplification Atmospheric sciences |
description |
Thesis (Master's)--University of Washington, 2020 The lapse-rate feedback is the dominant driver of stronger warming in the Arctic than the Antarctic in simulations with increased CO2. While Antarctic surface elevation has been implicated in promoting a weaker Antarctic lapse-rate feedback, the mechanisms in which elevation impacts the lapse-rate feedback are still unclear. Here we suggest that weaker Antarctic warming under CO2 forcing stems from shallower, less intense climatological inversions due to limited atmospheric heat transport above the ice sheet elevation and elevation-induced katabatic winds. In slab ocean model experiments with flattened Antarctic topography, stronger climatological inversions support a stronger lapse-rate feedback and annual-mean Antarctic warming comparable to the Arctic under CO2 doubling. Unlike the Arctic, seasonality in warming over flat Antarctica is mainly driven by a negative shortwave cloud feedback which exclusively dampens summer warming, with a smaller contribution from the winter-enhanced lapse-rate feedback. |
author2 |
Battisti, David Armour, Kyle |
format |
Thesis |
author |
Hahn, Lily |
author_facet |
Hahn, Lily |
author_sort |
Hahn, Lily |
title |
Antarctic Elevation Drives Hemispheric Asymmetry in Polar Lapse Rate Climatology and Feedback |
title_short |
Antarctic Elevation Drives Hemispheric Asymmetry in Polar Lapse Rate Climatology and Feedback |
title_full |
Antarctic Elevation Drives Hemispheric Asymmetry in Polar Lapse Rate Climatology and Feedback |
title_fullStr |
Antarctic Elevation Drives Hemispheric Asymmetry in Polar Lapse Rate Climatology and Feedback |
title_full_unstemmed |
Antarctic Elevation Drives Hemispheric Asymmetry in Polar Lapse Rate Climatology and Feedback |
title_sort |
antarctic elevation drives hemispheric asymmetry in polar lapse rate climatology and feedback |
publishDate |
2020 |
url |
http://hdl.handle.net/1773/46729 |
geographic |
Antarctic Arctic The Antarctic |
geographic_facet |
Antarctic Arctic The Antarctic |
genre |
Antarc* Antarctic Antarctica Arctic Climate change Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Arctic Climate change Ice Sheet |
op_relation |
Hahn_washington_0250O_22379.pdf http://hdl.handle.net/1773/46729 |
op_rights |
CC BY |
_version_ |
1766264527175811072 |