| Pu Shuzhen,Yu Fei,Hu Xiaomin,Chen Xingrong. 2003. Spatial and temporal variability of heat content above the thermocline in the tropical Pacific Ocean. Acta Oceanologica Sinica, (2):179－190 |
| Spatial and temporal variability of heat content above the thermocline in the tropical Pacific Ocean |
| Spatial and temporal variability of heat content above the thermocline in the tropical Pacific Ocean |
| Received:April 12, 2002 Revised:January 24, 2003 |
| DOI： |
| Key words:Heat content ENSO tropical Pacific Ocean |
| 中文关键词: Heat content ENSO tropical Pacific Ocean |
| 基金项目:This study was supported by the National Key Progamme for Developing Basic Sciences of China under contract No. G1998040900(Part 1). |
| Author Name | Affiliation | | Pu Shuzhen | First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | Yu Fei | First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | Hu Xiaomin | First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | Chen Xingrong | First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China |
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| Abstract: |
| Heat content of the upper layer above the 20℃ isotherm in the tropical Pacific Ocean is estimated by using the sea temperature data set with a resolution 2°latitude×5°longitude (1980~1993) for the water depths (every 10 m) from 0 m to 400 m, and its temporal and spatial variabilities are analyzed. (1) The temporal variability indicates that the total heat in the upper layer of the equatorial Pacific Ocean is charcterized by the interannual variability. The time series of the equatorial heat anomaly 5 months lead that of the El Nino index at the best positive lag correlation between the two, and the former 13 months lag behind the latter at their best negative lag correlation. Therefore the equatorial heat content can be used as a better predictor than the El Nino index for a warm or cold event. In addition, it is also found that less heat anomaly in the equator corresponds to the stronger warm events in the period (1980~1993) and much more heat was accumulated in the 4 years including 1992/11993 ENSO (1989~1993) than the 4 years including 1982/1983 ENSO (1980~1983); (2) The spatial variability indicates that the area with the highest lag correlation among the grids moves in an anti-clockwise circle in the northern tropical Pacific Ocean within 4 years period and in a clockwise circle in the southern tropical Pacific Ocean. This result provides scientific evidence for the quasi-cycle theory of El Nino events. |
| 中文摘要: |
| Heat content of the upper layer above the 20℃ isotherm in the tropical Pacific Ocean is estimated by using the sea temperature data set with a resolution 2°latitude×5°longitude (1980~1993) for the water depths (every 10 m) from 0 m to 400 m, and its temporal and spatial variabilities are analyzed. (1) The temporal variability indicates that the total heat in the upper layer of the equatorial Pacific Ocean is charcterized by the interannual variability. The time series of the equatorial heat anomaly 5 months lead that of the El Nino index at the best positive lag correlation between the two, and the former 13 months lag behind the latter at their best negative lag correlation. Therefore the equatorial heat content can be used as a better predictor than the El Nino index for a warm or cold event. In addition, it is also found that less heat anomaly in the equator corresponds to the stronger warm events in the period (1980~1993) and much more heat was accumulated in the 4 years including 1992/11993 ENSO (1989~1993) than the 4 years including 1982/1983 ENSO (1980~1983); (2) The spatial variability indicates that the area with the highest lag correlation among the grids moves in an anti-clockwise circle in the northern tropical Pacific Ocean within 4 years period and in a clockwise circle in the southern tropical Pacific Ocean. This result provides scientific evidence for the quasi-cycle theory of El Nino events. |
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