Abstract
In January 2018, a high record of monthly total precipitation in northern China drew our attention. The precipitation amount is 4 times more than that in normal winters over the past 30 years. Up to now, many researches over the world focus on the intensity of precipitations or the number of intense precipitations, however, no sufficient study is investigated in the continuous moderate precipitations. The abnormal precipitation in January 2018 in northern China is a typical case of the continuous moderate precipitation. The research region is composed by the northern part of the farming-pastoral zone and the Hulunbuir Grassland. The main method in this study consists of analyzing the abnormal precipitation month by identifying the precipitation types and locations, and exploring the atmospheric circulations at the moment of typical precipitations. The research found that the continuity is the key point for high precipitation amount in January 2018 in Northern China. Besides, this continuity is caused by frequent appearance of cyclones in the vicinity.
Highlights
Northern China is always considered as a dry region comparing to the southern China
Despite studies on heavy winter precipitations are done at a global scale, no studies have focused on inland winter precipitations in the areas in northern China where the cold days can even expand up to half of a year
To see where the value of the maximum precipitation in January 2018 situates through the 30 winters, we draw in Figure 2 Region-averaged and maximum monthly total precipitation using GEV distribution
Summary
Northern China is always considered as a dry region comparing to the southern China. Especially in winter, a dry lasting cold weather dominates in the north. Over the past 30 years from 1988 to 2018, the maximum winter precipitation amount of the Region is no more than 100 mm, in January 2018 that exceeds 400 mm. In Romania, positive North Atlantic Oscillation and blocking phenomenon over the Atlantic-European sector can cause winter precipitations to decrease [19]. Global warming is another key contributor to extratropical cyclones, leading to the increase of the precipitation intensity [20]. We focus on typical individual heavy precipitation event in January 2018, and use dynamical analyses to investigate in the atmospheric circulations during those precipitations
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