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Climatic Characteristics of Different Time Scales of Meiyu Precipitation in Shanghai

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DOI: 10.23977/erej.2023.070305 | Downloads: 12 | Views: 513

Author(s)

Mavlan Kader 1, Zhang Xin 2, Liu Min 1, Sun Shaoming 3

Affiliation(s)

1 Xinjiang Airport Group Co., Ltd, Urumqi, 830000, China
2 Shanghai Central Meteorological Observatory, Shanghai, 200030, China
3 Xinjiang ATMB CAAC, Urumqi, 830000, China

Corresponding Author

Zhang Xin

ABSTRACT

Based on the daily precipitation data of 10 national stations and regional stations in Shanghai from 1960 to 2020, the temporal and spatial distribution characteristics of Meiyu season precipitation in Shanghai and the climatic characteristics of Meiyu season precipitation in Shanghai were analyzed. The first mode PC of EOF was used to correlate with 500hPa, 850hPa height field, 850 specific humidity field and wind field to analyze the temporal and spatial distribution characteristics of Meiyu season precipitation in Shanghai and the physical quantity field variation law of climatic state change. The results show that the temporal variation trends of annual precipitation and accumulated precipitation in Meiyu season in Shanghai are similar, and there are interannual and interdecadal variations. The inter-decadal precipitation showed an obvious upward trend.  The regional distribution of average precipitation during Meiyu period in Shanghai is complex and variable, but at the same time, the distribution shows a certain difference between the north and the south.  There are interdecadal and interannual trends in the maximum cumulative precipitation per day, the number of rainy days in the Meiyu season, the maximum cumulative rainfall for five consecutive days at a single station, and the longest continuous rainfall days at a single station. From the perspective of interdecadal changes, except for individual interdecadal changes, the overall trend is upward, there are mainly 2-8 years of periodic oscillations. The subtropical high maintains between South China and the middle and lower reaches of the Yangtze River. The high-latitude low-pressure system is active. The conditions of high specific humidity in the southeast coastal area and low specific humidity in the inland, high relative humidity in the coastal area and low relative humidity in the inland are conducive to the increase of Meiyu season precipitation in Shanghai. The most favorable zonal wind condition for the precipitation in Shanghai during the Meiyu season is that Shanghai is located on the north side of the subtropical high, and the westerly jet strengthens. The reason for the increase of precipitation in Shanghai in July and August is not only the Meiyu precipitation, but also some interference under extreme circulation conditions. The southerly wind to the south of Shanghai and the northerly wind to the north strengthened, and the north-south cold and warm air converged in Shanghai, which directly increased the precipitation in the Meiyu season in Shanghai.

KEYWORDS

Precipitation in Meiyu season in Shanghai; temporal and spatial distribution law; climatic characteristics; circulation form; physical quantity

CITE THIS PAPER

Mavlan Kader, Zhang Xin, Liu Min, Sun Shaoming, Climatic Characteristics of Different Time Scales of Meiyu Precipitation in Shanghai. Environment, Resource and Ecology Journal (2023) Vol. 7: 33-47. DOI: http://dx.doi.org/10.23977/erej.2023.070305.

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