Climatic Features of Asian Upper Westerly Jet Activities and Their Relationship with Summer Precipitation in Partly Areas of China

WEI Lin-Bo;ZHOU Gan-Lin;WANG Shi-Gong;SHANG Ke-Zheng;MA Yu-Xia

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Plateau Meteorology
Plateau Meteorology ›› 2012, Vol. 31 ›› Issue (1) : 87-93.

Climatic Features of Asian Upper Westerly Jet Activities and Their Relationship with Summer Precipitation in Partly Areas of China

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Abstract

To better explore and understand the activity features of Asian Upper Westerly Jet (AUWJ) and their application to the weather forecast, the climatic features of pentad-to-pentad activities of AUWJ and their relationship with precipitation in partly areas of China were analyzed utilizing the 200  hPa wind speed of the NCEP/NCAR reanalyzed data from 1948 to 2008. The main conclusions are as follows:  (1) The AUWJ moves northward from 30°N to 45°N from winter to summer; then southward back to  30°N again after summer. When moving northward, there are two fast-moving periods especially at the longitude about 90°E, one is from mid-April through the end of May, and the other is from June to July. The latter period corresponds to the Meiyu period in Changjiang-Huaihe River (CHR). (2) The center of AUWJ usually stays at about 140°E for majority time of the whole year, while it moves quickly westward in mid-June; it moves to the upper of CHR in late June and Tianshan region of Xinjiang in the end of July, and then it moves eastward quickly back to  140°E again. It stays at the Asian continent just for about two months every year. (3) There is certain relationship between the AUWJ center latitude position and precipitation in CHR during the Meiyu period. Averagely, when the AUWJ center position is more westerly than normal in January, and the AUWJ axis is more southerly from April to May, it may be heavy Meiyu in CHR; vice versa. (4) There is also certain relationship between the strength and latitude position of AUWJ and the precipitation in Xinjiang in summer. When the AUWJ axis over Xinjiang is more northerly from mid-April to late May, and the axis is more southerly and AUWJ is stronger than normal in summer, the precipitation of Xinjiang in summer will be more than normal; vice versa.

Key words

Asia / Upper westerly jet o / Meiyu in Changjiang- / Xinjiang precipitati

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WEI Lin-Bo , ZHOU Gan-Lin , WANG Shi-Gong , SHANG Ke-Zheng , MA Yu-Xia. Climatic Features of Asian Upper Westerly Jet Activities and Their Relationship with Summer Precipitation in Partly Areas of China. Plateau Meteorology. 2012, 31(1): 87-93

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