Arid Zone Research ›› 2020, Vol. 37 ›› Issue (6): 1519-1527.doi: 10.13866/j.azr.2020.06.17

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Climate characteristics of day and night precipitation during the growing season in Inner Mongolia from 1961 to 2018

SHEN Lu-ting1,2, ZHANG Fang-min1,2, HUANG Jin1,2, LI Yun-peng3   

  1. (1. College of Applied Meteorology, Nanjing University of Information Science & Technology, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing 210044, Jiangsu, China; 2. Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, Jiangsu, China; 3. Ecology and Agrometeorology Center of Inner Mongolia Autonomous Region, Hohhot 010051, Inner Mongolia, China)
  • Received:2020-03-12 Revised:2020-08-17 Online:2020-11-15 Published:2021-01-24

Abstract: The aim of this study is to provide scientific guidance for agricultural development and ecological restoration projects in Inner Mongolia. The spatial and temporal climate characteristics of day and night precipitation amounts in Inner Mongolia during the growing season from 1961 to 2018 were analyzed based on the daily surface precipitation data collected at 103 meteorological observation stations using trend analysis, Mann- Kendall test, and Morlet wavelet. In the past 58 years, the average annual precipitation amounts in the daytime were more than those at night during the growing season in Inner Mongolia. However, day and night precipitation amounts showed significant monthly variation as well as different oscillation periods. The day and night precipitation amounts did not change obviously, but the number of day and night precipitation days showed decreasing trends. The annual precipitation amount and days had similar spatial distributions, decreasing from the northeast to the southwest. Day precipitation contributed more to the daily total precipitation amount in southcentral and eastern Inner Mongolia, whereas the difference between day and night precipitation amounts (DDNA) and the difference between day and night precipitation days (DDND) were both higher than west Inner Mongolia. The DDNA and DDND were smaller in western Inner Mongolia. In addition, the variation patterns of day and night precipitation were similar, showing decreasing trends in central Inner Mongolia but increasing trends in western and eastern Inner Mongolia. However, the number of day and night precipitation days showed quite different spatial variation patterns. The number of day precipitation days did not change obviously in western Inner Mongolia but decreased in central and northeast Inner Mongolia. The number of night precipitation days increased in western, central, and northeastern Inner Mongolia but decreased from southeast to northeast.

Key words: day and night precipitation, night precipitation rate, change trend, oscillation period, Inner Mongolia