碩士 / 國立臺灣大學 / 大氣科學研究所 / 99 / The sun is well-known as the fundamental energy source that drives the global climate system. It has been suggested that the 11-year cycle of solar forcing is associated with various phenomena in both atmosphere and ocean from the observation. However, the amplitude of the solar cycle is relatively small, there has always been a question that how this small variation could be amplified to produce significant responses in the earth system. We will use two state-of-the-art fully coupled earth system models, COSMOS (Community system Earth models) and CCSM4 (Community Climate System Model), to investigate the influence of the 11-year solar activity on the global climate system and the two major mechanisms proposed to explain the response of climate system to solar forcing. The sensitivity of including 11-year solar forcing is examined. The results indicate that the atmosphere temperature may indeed response according to the additional solar forcing for both models. Also, the “bottom-up” air-sea coupling mechanism [Meehl et al.,2003; Van Loon et al.,2007] can be reproduced in the COSMOS and CCSM4 model. We find SSTa cooling in the Eastern Pacific equatorial, but the spatial pattern of the response is neither La Niña-like nor El Niño-like. Moreover, there are significant signals in sea level pressure and geopotential heights near Aleutian Low. The Hadley cell is expanded northward and the Ferrel cell is shifted in response of the solar forcing. The position and the strength of Hadley cell may affect the pattern of North Pacific Oscillation (NPO) and Aleutian Low. We suggest that solar may affect the Aleutian Low region through SLP mode 1 (AL) and mode 2 (NPO). Solar forcing could modulate the dynamics of ENSO through NPO via seasonal footprinting mechanism and also affect the SST variation in Western Pacific through NPO via heat flux and oceanic Rossby wave. We will further examine and quantify the possibly amplification resulting from the small solar variation.
| Identifer | oai:union.ndltd.org:TW/099NTU05022032 |
| Date | January 2011 |
| Creators | Pei-Yu Chueh, 闕珮羽 |
| Contributors | 曾于恒 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 90 |
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