| CLIMATIC CHARACTERISTICS OF THE ONSET OF SOUTH CHINA SEA SUMMER MONSOON II. INTER-DECADAL VARIATION |
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| 作者姓名： | 王安宇 冯瑞权 吴池胜 侯尔滨 林建恒 罗会邦 |
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| 作者单位： | 王安宇,吴池胜,罗会邦(Department of Atmospheric Sciences,Guangzhou,510275 China);冯瑞权,侯尔滨,林建恒(Macao Meteorological and Geophysical Bureau,Macao,China)
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| 基金项目： | National Scaling Project A — The Scientific Experiment on South China Sea Monsoon; Part I
from the fund for the Development Planning of Key National Fundamental Research (G1998040900) |
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| 摘 要： | By using the 40-year NCEP (1958-1997) grid point reanalysis meteorological data, we analyzed the
inter-decadal variation on the climatic characteristics of the onset of South China Sea summer monsoon. The
results are as follows. (1) There was great difference on the onset date of the SCS summer monsoon between the
first two decades and the last two decades. It was late on the 6th pentad of May for the first two decades and was
on the 4th and 5th pentad of May for the next two decades. (2) Except for the third decade (1978-1987), the
establishment of the monsoon rainfall was one to two pentads earlier than the onset of the summer monsoon in all
other three decades. (3) The onset of the SCS monsoon is the result of the abrupt development and eastward
advancement of the southwesterly monsoon over the Bay of Bengal. The four-decade analysis shows that there
were abrupt development of the southwesterly monsoon over the Bay of Bengal between the 3rd and 4th pentad of
May, but there was great difference between its eastward movement and its onset intensity. These may have
important effect to the earlier or later onset of the SCS summer monsoon. (4) During the onset of the SCS summer
monsoon, there were great difference in the upper and lower circulation feature between the first two and the next
two decades. At the lower troposphere of the first two decades, the Indian-Burma trough was stronger and the
center of the subtropical high was located more eastward. At the upper troposphere, the northward movement of
the center of subtropical high was large and located more northward after it landed on the Indo-China Peninsula.
After comparison, we can see that the circulation feature of the last two decades was favorable to the establishment and development of the SCS summer monsoon.
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| 关 键 词： | South China Sea summer monsoon onset climate characteristics inter-decadal variation |
CLIMATIC CHARACTERISTICS OF THE ONSET OF SOUTH CHINA SEA SUMMER MONSOON II. INTER-DECADAL VARIATION |
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| WANG An-yu,FONG Soi-kun,WU Chi-sheng,HAN I-pan,LAM Kin-hang and LUO Hui-bang.CLIMATIC CHARACTERISTICS OF THE ONSET OF SOUTH CHINA SEA SUMMER MONSOON II. INTER-DECADAL VARIATION[J].Journal of Tropical Meteorology,2002,8(1):27-36. |
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| Authors: | WANG An-yu FONG Soi-kun WU Chi-sheng HAN I-pan LAM Kin-hang and LUO Hui-bang |
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| Institution: | Department of Atmospheric Sciences,Zhongshan University |
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| Abstract: | By using the 40-year NCEP (1958-1997) grid point reanalysis meteorological data,we analyzed the inter-decadal variation on the climatic characteristics of the onset of South China Sea summer monsoon.The results are as follows.(1) There was great difference on the onset date of the SCS summer monsoon between the first two decades and the last two decades.It was late on the 6th pentad of May for the first two decades and was on the 4th and 5th pentad of May for the next two decades.(2) Except for the third decade (1978-1987),the establishment of the monsoon rainfall was one to two pentads earlier than the onset of the summer monsoon in all other three decades.(3) The onset of the SCS monsoon is the result of the abrupt development and eastward advancement of the southwesterly monsoon over the Bay of Bengal.The four-decade analysis shows that there were abrupt development of the southwesterly monsoon over the Bay of Bengal between the 3rd and 4th pentad of May,but there was great difference between its eastward movement and its onset intensity.These may have important effect to the earlier or later onset of the SCS summer monsoon.(4) During the onset of the SCS summer monsoon,there were great difference in the upper and lower circulation feature between the first two and the next two decades.At the lower troposphere of the first two decades,the Indian-Burma trough was stronger and the center of the subtropical high was located more eastward.At the upper troposphere,the northward movement of the center of subtropical high was large and located more northward after it landed on the Indo-China Peninsula.After comparison,we can see that the circulation feature of the last two decades was favorable to the establishment and development of the SCS summer monsoon. |
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| Keywords: | South China Sea summer monsoon onset climate characteristics inter-decadal variation |
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