| Impacts of SST and SST Anomalies on Low-Prequency Oscillation in the Tropical Atmosphere |
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| 作者姓名： | 何金海 宇婧婧 沈新勇 |
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| 作者单位： | Jiangsu Key Laboratory of Meteorological Disaster (KLME) Nanjing University of Information Science and Technology，Jiangsu Key Laboratory of Meteorological Disaster (KLME) Nanjing University of Information Science and Technology，Jiangsu Key Laboratory of Meteorological Disaster (KLME) Nanjing University of Information Science and Technology Nanjing 210044 Institute of Tropical and Marine Meteorology，China Meteorological Administration，Guangzhou 510080，Nanjing 210044 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics，Institute of Atmospheric Physics，Chinese Academic of Sciences，Beijing 100029，Nanjing 210044 |
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| 摘 要： | Considering the multiscale character of LFO (low-frequency oscillation) in the tropical atmosphere, the effects of SST on LFO in the tropical atmosphere are discussed by using an absolute ageostrophic, baroclinic model. Here, SST effects include sea surface heating and forcing of SST anomalies (SSTAs). Studies of the influences of sea surface heating on LFO frequency and stability show that sea surface heating can slow the speed of waves and lower their frequency when SST is comparatively low; while higher SST leads to unstable waves and less periods of LFO. Since the impact of a SSTA on ultra-long waves is more evident than that on kilometer-scale waves, long-wave approximation is used when we continue to study the effect of SSTAs. Results indicate that SSTAs can lead to a longer period of LFO, and make waves unstable. In other words, positive (negative) SSTAs can make waves decay (grow).
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Impacts of SST and SST Anomalies on Low-Prequency Oscillation in the Tropical Atmosphere |
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| HE Jinhai,YU Jingjing,and SHEN Xinyong Jiangsu Key Laboratory of Meteorological Disaster.Impacts of SST and SST Anomalies on Low-Prequency Oscillation in the Tropical Atmosphere[J].Advances in Atmospheric Sciences,2007(3). |
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| Authors: | HE Jinhai YU Jingjing and SHEN Xinyong Jiangsu Key Laboratory of Meteorological Disaster |
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| Abstract: | Considering the multiscale character of LFO (low-frequency oscillation) in the tropical atmosphere, the effects of SST on LFO in the tropical atmosphere are discussed by using an absolute ageostrophic, baroclinic model. Here, SST effects include sea surface heating and forcing of SST anomalies (SSTAs). Studies of the influences of sea surface heating on LFO frequency and stability show that sea surface heating can slow the speed of waves and lower their frequency when SST is comparatively low; while higher SST leads to unstable waves and less periods of LFO. Since the impact of a SSTA on ultra-long waves is more evident than that on kilometer-scale waves, long-wave approximation is used when we continue to study the effect of SSTAs. Results indicate that SSTAs can lead to a longer period of LFO, and make waves unstable. In other words, positive (negative) SSTAs can make waves decay (grow). |
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| Keywords: | Low-Frequency Oscillation (LFO) sea surface heating sea surface temperature anomaly (SSTA) ultra-long wave kilometer-scale precipitation |
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