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Fine-scale Characteristics of Rainfall in Shanghai Based on
a High-Density AWS Dataset
WANG Ya ,DONG Guangtao ,YANG Chen ,FAN Yunxin 1
2
1
1
(1. Shanghai Meteorological Disaster Prevention Technology Center,Shanghai 200030,China;
2. Shanghai Climate Center,Shanghai 200030,China)
Abstract:The hourly precipitation data of 49 automatic weather stations from 2007 to 2017 in Shanghai isana‐
lyzed. Quality control of automatic weather station data is implemented. The fine-scaled temporal and spatial
characteristics of precipitation is revealed in Shanghai. The result shows that,firstly,data of encrypted observed
automatic weather stations can capture the finer characteristics of precipitation,and the precipitation distribution
is mainly northeast-southwest. There are multi-centers in the rain area,namely high-value center of central city,
southern Songjiang,and the coast of Pudong. Secondly,the spatial consistency of the diurnal changes of precipi‐
tation in spring and summer is strong,and it’s single-peak changes. The peak of daily precipitation in spring ap‐
pears in the early morning,and the peak of in summer is in the evening. In summer,under the combined influ‐
ence of the southwest wind and heat island effect,the sea-land boundary areaand the lower reachof the central ur‐
ban area( Baoshan and Western Pudong)are high-value areas. Most of them are short-duration precipitation.
Thirdly,the trend of short-duration precipitation in urban stations is mainly downward,while the trend in subur‐
ban stations is mainly upward. Among them,the downwind direction of urban area are the areas with the fastest
increase in precipitation,such as Jiading District and the west of Pudong District. Maybe,it’s caused by the in‐
crease of frequency of precipitation. The article further reveals the mechanism of early morning precipitation and
the impact of urbanization on the distribution of seasonal precipitation.
Key words:Precipitation;fine-scale characteristic;multicenter distribution;peak in the early morning;trend
change