Anomalous eastward displacement of the tropical western Pacific warm pool and warming of the tropical eastern Pacific |
| |
Authors: | Long Baosen Li Bocheng and Zou Emei |
| |
Institution: | First Institute of Oceanography, State Oceanic Administration, Qingdao 266003, China |
| |
Abstract: | Based on the data from the Climate Diagnostics Bulletin, Oceanographic Monthly Summary, UH Sea Level Center and TOGA-COARE IOP, the response of warm pool in the tropical western Pacific and the tropical eastern Pacific SST to the anomalous wind field during 1992/1993 El Niño has been analyzed. The results show that the eastward transport of warm water of the tropical western Pacific due to the westerly wind burst leads not only to a drop of sea level but also to a raise of thermocline in the tropical western Pacific. Consequently the heat content in upper layer water decreases especially in the thermocline. Contrary to this, the positive anomalies of heat content and thermocline depth appear in the tropical eastern Pacific. The positive anomalies in the eastern Pacific lag the negative ones in the western Pacific by two months; The anomalous eastward shift of warm pool (28℃ isotherm) is a direct respouse of ocean current to westerly wind anomalies in low-level atmosphere; quantitative calculations show that the thermal advection caused by anomalous ocean current is the main force of anomalous eastward displacement of the warm pool (28℃ isotherm) and the one of main causes for anomalous warming of the tropical eastern Pacific. |
| |
Keywords: | Warm pool westerly wind burst thermal advection EI Nino |
本文献已被 CNKI 等数据库收录! |
| 点击此处可从《海洋学报(英文版)》浏览原始摘要信息 |
| 点击此处可从《海洋学报(英文版)》下载免费的PDF全文 |