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The mechanisms explaining the East A...

Jin, Yan.

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The mechanisms explaining the East Asian Summer Monsoon (EASM) response to global climate change.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The mechanisms explaining the East Asian Summer Monsoon (EASM) response to global climate change./
作者:	Jin, Yan.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
面頁冊數:	145 p.
附註:	Source: Dissertations Abstracts International, Volume: 78-07, Section: B.
Contained By:	Dissertations Abstracts International78-07B.
標題:	Climate Change. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10191667
ISBN:	9781369527391

The mechanisms explaining the East Asian Summer Monsoon (EASM) response to global climate change.
Jin, Yan.

The mechanisms explaining the East Asian Summer Monsoon (EASM) response to global climate change. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 145 p.

Source: Dissertations Abstracts International, Volume: 78-07, Section: B.

Thesis (Ph.D.)--George Mason University, 2016.

This item must not be sold to any third party vendors.

The mechanisms responsible for the East Asian Summer Monsoon (EASM) changes in a global warming scenario are investigated. Previous studies have shown that the EASM response to a warmer climate is primarily caused by the changes in western North Pacific Subtropical High (WNPSH), and the variations of WNPSH is attributed to the mean state of boundary conditions. However, none of these studies analyzed the impact of the remote air-sea interactions over tropical areas on the WNPSH. The main objective of this study is to investigate this remote air-sea interaction mechanism. The EASM simulation under present climate using Super-Parameterized CCSM4 (SP- CCSM4) is firstly evaluated. SP-CCSM4 is a coupled climate model which implements a new representation of cloud-scale processes. It reveals that SP-CCSM4 captures the main features of observed EASM climatology, as well as the mechanisms associated with the northward propagation of the intraseasonal oscillation. Additionally, SP-CCSM4 has a higher model skill in simulating the mean state and annual cycle of the EASM than the conventionally-parameterized CCSM4. The response of the EASM under the global warming scenario is analyzed using SP- CCSM4. In the future warmer climate the mean state of the EASM is intensified, with enhanced precipitation and stronger monsoon circulation. The Mei-yu season has longer duration, and the precipitation over northern EASM domain is intensified and persists longer. The interannual variability of the EASM is amplified, with enhanced precipitation over northern East Asia. Due to the influence of the WNPSH on the EASM, the mechanisms responsible for the changes of WNPSH in the warmer climate are essential to understand the mechanisms explaining the EASM variations. Based on the analysis of the EASM simulation under various warming scenarios, a remote air-sea interaction mechanism is proposed. It reveals that the changes in the WNPSH in the warmer climate are due to two factors: the warming of the boundary conditions, and the convective activities over tropical South China Sea (SCS) and West Pacific Ocean (WP). The warming of the boundary conditions is more important than the atmospheric warming, and it favors the WNPSH extend westward in the warmer climate. At meantime, the weak (strong) convection over tropical SCS and WP favors (inhibits) the westward extension of the WNPSH. In order to test this mechanism, two numerical experiments are designed. The control- type experiment tests how the ocean mean state influences the atmosphere, and the sensitivity- type experiment aims to prove that the weak convection over SCS and adjacent WP leads to the westward extension of the WNPSH. This mechanism is confirmed by analyzing the mean state and the interannual variability of the EASM in these model experiments. The weaker convective activity over tropical SCS and adjacent WP induces an anti-cyclonic cir- culation to its northwest, plus a Rossby wave train from tropical to mid-latitude Pacific Ocean. The westerly anomaly on the northern side of the anti-cyclonic circulation intensi- fies the prevailing westerly/southwesterly flow, amplifying the western edge of the WNPSH and strengthening the monsoon circulation, thus favoring the westward extension of the WNPSH. However, the impact of the convection over tropical area on the WNPSH persists from May to June. During July and August, the changes in the WNPSH are affected by the systems in mid-latitudes.

ISBN: 9781369527391Subjects--Topical Terms:

894284
Climate Change.

The mechanisms explaining the East Asian Summer Monsoon (EASM) response to global climate change.
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