| Long Baosen,Li Bocheng,Zou Emei. 1999. Anomalous eastward displacement of the tropical western Pacific warm pool and warming of the tropical eastern Pacific. Acta Oceanologica Sinica, (1):49－58 |
| Anomalous eastward displacement of the tropical western Pacific warm pool and warming of the tropical eastern Pacific |
| Anomalous eastward displacement of the tropical western Pacific warm pool and warming of the tropical eastern Pacific |
| Received:July 07, 1997 Revised:March 02, 1998 |
| DOI： |
| Key words:Warm pool westerly wind burst thermal advection El Niño |
| 中文关键词: Warm pool westerly wind burst thermal advection El Niño |
| 基金项目:This work is supported by the National Key Project Studies on Short-range Climate Prediction System in China under contract No. 96-908-04-02-2. |
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| 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. |
| 中文摘要: |
| 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. |
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