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University of Washington

1. Hahn, Lily. Antarctic Elevation Drives Hemispheric Asymmetry in Polar Lapse Rate Climatology and Feedback.

Degree: 2021, University of Washington

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. Advisors/Committee Members: Battisti, David (advisor), Armour, Kyle (advisor).

Subjects/Keywords: Antarctica; Arctic; atmospheric heat transport; climate change; lapse rate feedback; polar amplification; Climate change; Atmospheric sciences; Atmospheric sciences

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Hahn, L. (2021). Antarctic Elevation Drives Hemispheric Asymmetry in Polar Lapse Rate Climatology and Feedback. (Thesis). University of Washington. Retrieved from http://hdl.handle.net/1773/46729

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Hahn, Lily. “Antarctic Elevation Drives Hemispheric Asymmetry in Polar Lapse Rate Climatology and Feedback.” 2021. Thesis, University of Washington. Accessed April 22, 2021. http://hdl.handle.net/1773/46729.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Hahn, Lily. “Antarctic Elevation Drives Hemispheric Asymmetry in Polar Lapse Rate Climatology and Feedback.” 2021. Web. 22 Apr 2021.

Vancouver:

Hahn L. Antarctic Elevation Drives Hemispheric Asymmetry in Polar Lapse Rate Climatology and Feedback. [Internet] [Thesis]. University of Washington; 2021. [cited 2021 Apr 22]. Available from: http://hdl.handle.net/1773/46729.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hahn L. Antarctic Elevation Drives Hemispheric Asymmetry in Polar Lapse Rate Climatology and Feedback. [Thesis]. University of Washington; 2021. Available from: http://hdl.handle.net/1773/46729

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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