A study on flow field and heat exchange anomalies on tropical pacific surface in the El Nino and La Nina events
- 33 Downloads
In this paper, based on the 2°×2° grid data COADS from 1950–1987 the flow field and heat exchange anomalies on the (11°S–11°N, 120° E-80°W) tropical Pacific surface (TPS) have been studied in El Nino and La Nina events. During El Nino, the zonal pressure gradient and trade winds decreased on the TPS, the tropical convergence strengthened on TPS, especially on the central TPS, the sensible and latent heat exchange increased, the net longwave radiation and incident solar radiation decreased and the net gain (loss)of heat reduced (increased) on the central and eastern TPS. During La Nina the results were opposite. Finally, two feedback mechanisms which include the dynamic, thermal and hydrological processes during El Nino and La Nina have been summarized and a conceptive model for El Nino-La Nina cycle is given. An estimated period for the El Nino-La Nina cycle is obtained.
KeywordsWaste Water Solar Radiation Flow Field Pressure Gradient Latent Heat
Unable to display preview. Download preview PDF.
- Bai, D. et al., 1990:Heat Budget Atlas of the Pacific Surface. Beijing: Oceanographic Press, (in Chinese).Google Scholar
- Bjerknes, J., 1966: A possible response of the atmospheric Hadley circulation to equatorial anomalies of ocean temperature.Tellus,18, 820–829.Google Scholar
- Bunker, A., 1976: Computation of surface energy flux and annual air-sea interaction cycles of the North Atlantic Ocean.Mon. Wea Rev.,104, 1121–1140.Google Scholar
- Ma, K. et al., 1993: Study on air-sea heat exchange mechanism in El Nino and La Nina events.Acta Meteorologica Sinica,7, 79–89.Google Scholar
- Monitoring Group of ENSO, 1989: Classification and Index of El Nino Events,Meteorological monthly,15, 37–38 (in Chinese).Google Scholar
- Ramage, C. S., Hori, A. M., 1981: Meteorological aspects of El Nino.Mon. Wea. Rev.,109, 1827–1835.Google Scholar
- Rowntree, P. R., 1972: The influence of tropical East Pacific Ocean temperature on the atmosphere.Quart. J. Meteor. Soc.,98, 290–321.Google Scholar
- Wang, S. et al., 1986: The western and central Pacific rainfall and the El Nino events.Acta Meteorological Sinica,44, 403–410 (in Chinese).Google Scholar
- Zhu, Y., Yang, D., 1990: Analysis of air-sea heat exchange during 1983: El Nino.Acta Oceanologica Sinica 12, 167–178 (in Chinese).Google Scholar