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The Atmospheric Response to Arctic S...

Blackport, Russell.

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The Atmospheric Response to Arctic Sea Ice Loss in the Coupled Climate System.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The Atmospheric Response to Arctic Sea Ice Loss in the Coupled Climate System./
Author:	Blackport, Russell.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
Description:	136 p.
Notes:	Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.
Contained By:	Dissertation Abstracts International78-10B(E).
Subject:	Physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10240515
ISBN:	9781369854664

The Atmospheric Response to Arctic Sea Ice Loss in the Coupled Climate System.
Blackport, Russell.

The Atmospheric Response to Arctic Sea Ice Loss in the Coupled Climate System. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 136 p.

Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.

Thesis (Ph.D.)--University of Toronto (Canada), 2017.

Arctic sea ice loss is expected to have a large impact on the atmosphere, both in the Arctic and potentially outside the Arctic, through changing the atmospheric circulation. In this thesis, the impact of sea ice loss in the climate system is studied using multi-century coupled Earth system model simulations that include dynamical coupling between oceans, atmosphere, and sea ice. In these simulations, sea ice is artificially melted by reducing its albedo. This framework allows for adequate sampling of the isolated impacts of sea ice loss when potentially important ocean feedbacks are included. It is shown that in response to sea ice loss, the atmospheric circulation response is weak compared with internal variability. There is a large reduction in temperature variability on all timescales over the Arctic Ocean. Smaller magnitude reductions in variability are also seen in mid-latitude temperature, sea level pressure and mid-tropospheric geopotential height.

ISBN: 9781369854664Subjects--Topical Terms:

516296
Physics.

The Atmospheric Response to Arctic Sea Ice Loss in the Coupled Climate System.
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245 1 4 $a The Atmospheric Response to Arctic Sea Ice Loss in the Coupled Climate System.
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300 $a 136 p.
500 $a Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.
500 $a Adviser: Paul J. Kushner.
502 $a Thesis (Ph.D.)--University of Toronto (Canada), 2017.
520 $a Arctic sea ice loss is expected to have a large impact on the atmosphere, both in the Arctic and potentially outside the Arctic, through changing the atmospheric circulation. In this thesis, the impact of sea ice loss in the climate system is studied using multi-century coupled Earth system model simulations that include dynamical coupling between oceans, atmosphere, and sea ice. In these simulations, sea ice is artificially melted by reducing its albedo. This framework allows for adequate sampling of the isolated impacts of sea ice loss when potentially important ocean feedbacks are included. It is shown that in response to sea ice loss, the atmospheric circulation response is weak compared with internal variability. There is a large reduction in temperature variability on all timescales over the Arctic Ocean. Smaller magnitude reductions in variability are also seen in mid-latitude temperature, sea level pressure and mid-tropospheric geopotential height.
520 $a The impacts of sea ice loss are isolated from the impacts of warming at low-latitudes in the sea ice albedo forced simulations and simulations forced by projected greenhouse-dominated radiative forcing using a pattern scaling method. It is found that many of the wintertime atmospheric circulation responses that occur in response to sea ice loss are opposed and at least partially cancelled out by the impacts of low-latitude warming. However, both sea ice loss and low-latitude surface warming act in concert to reduce subseasonal temperature variability throughout the mid and high latitudes.
520 $a Finally, the cause of the previously documented amplified response to sea ice loss in the coupled climate system is investigated. Atmospheric general circulation modelling (AGCM) experiments are performed that show that ocean warming in the mid-to-high latitudes induced by sea ice loss amplifies the atmospheric circulation response. The impact of the ocean warming that occurs in regions away from the sea ice loss region is similar in magnitude and structure to the impacts of sea ice loss itself, indicating modelling experiments that do not include ocean feedbacks will underestimate the response.
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