Impacts of SST and SST Anomalies on Low-Frequency Oscillation in the Tropical Atmosphere

• Published in: Advances in atmospheric sciences Vol. 24; no. 3; pp. 377 - 382
• Main Author: 何金海 宇婧婧 沈新勇
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Nature B.V 01.05.2007; Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510080%Jiangsu Key Laboratory of Meteorological Disaster (KLME),Nanjing University of Information Science and Technology, Nanjing 210044; Jiangsu Key Laboratory of Meteorological Disaster (KLME),Nanjing University of Information Science and Technology, 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%Jiangsu Key Laboratory of Meteorological Disaster (KLME),Nanjing University of Information Science and Technology, Nanjing 210044
• Subjects: Atmosphere; Marine; Oceans; SST异常; Studies; Temperature; Waves; 低频振荡; 南方涛动; 热带大气; kilometer-scale precipitation; sea surface temperature anomaly (SSTA); sea surface heating; ultra-long wave; Low-Frequency Oscillation (LFO)
• ISSN: 0256-1530; 1861-9533
• DOI: 10.1007/s00376-007-0377-2

Considering the multiscale character of LFO effects of SST on LFO in the tropical atmosphere （low-frequency oscillation） in the tropical atmosphere, the 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）.