摘要
Using surface and aerological meteorological observations obtained at the Xisha Automatic Weather Station and three moored buoys along the continental slope, characteristics of the synoptic-scale disturbances over the northern South China Sea （NSCS） are extensively studied. The power spectra of surface and aerological observations suggest a synoptic feature with a pronounced energy peak at a period of 5–8 d and a weak peak at 3–4 d. The standard deviation of the synoptic temperature component derived at Xisha Station from 1976 to 2011 indicates that the strongest variability normally exists in August all through the whole troposphere. At the interannual scale, it is found that El Nin o plays an important role in regulating the synoptic disturbances of atmosphere. The vertical synoptic disturbances have a double active peak following El Nin o condition. The first peak usually occurs during the mature phase of El Nin o, and the second one occurs in the summer of decay year. Comparing with the summer of developing years, the summer of the decaying year of El Nin o has more active and stronger synoptic disturbances, especially for the 5–8 d period variations.
Using surface and aerological meteorological observations obtained at the Xisha Automatic Weather Station and three moored buoys along the continental slope, characteristics of the synoptic-scale disturbances over the northern South China Sea （NSCS） are extensively studied. The power spectra of surface and aerological observations suggest a synoptic feature with a pronounced energy peak at a period of 5–8 d and a weak peak at 3–4 d. The standard deviation of the synoptic temperature component derived at Xisha Station from 1976 to 2011 indicates that the strongest variability normally exists in August all through the whole troposphere. At the interannual scale, it is found that El Nin o plays an important role in regulating the synoptic disturbances of atmosphere. The vertical synoptic disturbances have a double active peak following El Nin o condition. The first peak usually occurs during the mature phase of El Nin o, and the second one occurs in the summer of decay year. Comparing with the summer of developing years, the summer of the decaying year of El Nin o has more active and stronger synoptic disturbances, especially for the 5–8 d period variations.
基金
The aerological data of Xisha Station were downloaded from http://weather.uwyo.edu/upperair/sounding.html.by The National Natural Basic Research Program ("973" Program) of China, under contract No. 2011CB403501
the Knowledge Innovation Project for Distinguished Young Scholar of the Chinese Academy of Sciences of China under contract No. KZCX2-EW-QN203
the Knowledge Innovation Program of the Chinese Academy of Sciences of China under contract No. SQ200916
the National Natural Science Foundation of China under contract Nos 41206011 and 41106028
