菲律賓海/西北太平洋之海洋動力對海溫年際變化的影響

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Title:	菲律賓海/西北太平洋之海洋動力對海溫年際變化的影響
Authors:	張瓊文周佳許晃雄余嘉裕
Contributors:	大氣系
Keywords:	西北太平洋/菲律賓海表層海溫海洋動力海氣交互作用聖嬰氣候
Date:	2011~2013
Issue Date:	2012-02-22 09:57:18 (UTC+8)
Abstract:	海洋對氣候的影響是目前科學研究的重點。本研究重點在於探討西北太平洋/菲律賓海區域表層海溫變化與其所引發的低層大氣環流之間的海氣交互作用，並且尋找導致這些表層海溫年際變化的可能海洋動力機制。在聖嬰期間，西太平洋/菲律賓海區域表層海溫呈負距平。依據以往多項研究推測，這些地區的海溫年際變化主要歸因為大氣與海洋的熱通量交換及混合層的混流機制。我們發現，這些過程本身無法完全解釋海表面溫度的量變。海洋動力過程發揮了重要作用，但缺乏全面的了解。計畫將利用高解析度的海洋模式資料，分析聖嬰年間西北太平洋/菲律賓海區域的洋流、湧昇區及躍溫層的變化及其對海溫的影響，然後探索大氣與海溫耦合型態的長期變異。海洋對氣候的影響是目前科學研究的重點。本研究重點在於探討西北太平洋/菲律賓海區域表層海溫變化與其所引發的低層大氣環流之間的海氣交互作用，並且尋找導致這些表層海溫年際變化的可能海洋動力機制。在聖嬰期間，西太平洋/菲律賓海區域表層海溫呈負距平。依據以往多項研究推測，這些地區的海溫年際變化主要歸因為大氣與海洋的熱通量交換及混合層的混流機制。我們發現，這些過程本身無法完全解釋海表面溫度的量變。海洋動力過程發揮了重要作用，但缺乏全面的了解。計畫將利用高解析度的海洋模式資料，分析聖嬰年間西北太平洋/菲律賓海區域的洋流、湧昇區及躍溫層的變化及其對海溫的影響，然後探索大氣與海溫耦合型態的長期變異。 Sea surface temperature variation in the western Pacific sector/Philippine Sea has now been found to have significant impacts on the regional climate and have attracted intensive attentions during the last decade. The anomalous sea surface temperatures in these regions tend to be negative during El Niño events. It has been hypothesized in several studies that the interannual fluctuation of sea surface temperature in these regions can be largely attributed to the atmospheric forcing on the heat flux through the ocean surface or the mixing processes. We found that these processes alone cannot explain the quantitative change of sea surface temperature. The oceanic dynamical processes play an important role but are lacking of comprehensive understanding. In this work, the dynamical effect of the ocean during the El Niño will be investigated in depth. Such a study should give insight into the ocean’s participation in climate variability, a useful application for future regional climate prediction in the western North Pacific sector. Also, the study will advance the understanding of the local air-sea interaction process The work we propose is divided into two parts. The first part investigates the dynamics effect of the ocean. The strong El Niño event in 1997-1998 is chosen for the study. In the second stage of the work, mechanisms of long-term modulation as well as generation of the PSAC influencing the climate in the marine East Asia are investigated. Oceanic variations under different El Niño strength, such as the canonical El Niño v.s. El Niño Modoki, are investigated. Because of the scarcity of subsurface observations over ocean, for such a diagnostic study, the researcher intends to deploy model data (OFES and SINTEX-F), cross-examining with reanalysis data (JEDAC) and the buoy observations (TOGA/TAO).
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