Pentad Precipitation Changes During Recent 40 Years in Inner Mongolia

Pei Hao; Hao Lu; Han Jingwei

Vol.23, NO.5, 2012

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Article Navigation > Journal of Applied Meteorological Science > 2012 > 23(5): 543-550

Pei Hao, Hao Lu, Han Jingwei. Pentad precipitation changes during recent 40 years in Inner Mongolia. J Appl Meteor Sci, 2012, 23(5): 543-550.

Citation:

Pei Hao, Hao Lu, Han Jingwei. Pentad precipitation changes during recent 40 years in Inner Mongolia. J Appl Meteor Sci, 2012, 23(5): 543-550.

Pei Hao, Hao Lu, Han Jingwei. Pentad precipitation changes during recent 40 years in Inner Mongolia. J Appl Meteor Sci, 2012, 23(5): 543-550.

Citation:

Pei Hao, Hao Lu, Han Jingwei. Pentad precipitation changes during recent 40 years in Inner Mongolia. J Appl Meteor Sci, 2012, 23(5): 543-550.

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Pentad Precipitation Changes During Recent 40 Years in Inner Mongolia

Pei Hao¹,
Hao Lu^{2,3
,
,},
Han Jingwei¹

1.
Inner Mongolian Meteorological Service, Hohhot 010051
2.
College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044
3.
Key Laboratory of Agro-meteorological Science of Jiangsu Province, Nanjing 210044

Received Date: 2011-11-25
Rev Recd Date: 2012-06-05
Publish Date: 2012-10-31

Abstract

Abstract

In order to study the characteristics of the pentad precipitation median changes in Inner Mongolia, the daily precipitation records of 44 meteorological stations from 1964 to 2003 in this area are analyzed. These 40 years are divided into two 20-year periods, one is from 1964 to 1983, and the other is from 1984 to 2003. From these daily precipitation data, the pentad (5 d) precipitations in each period are calculated and compared at 5-day interval (pentad), and then the clustering analysis is conducted.First, the optimal clustering number of the pentad precipitation change between the first period and the second period is determined by 4 determining indices, classifying the stations into 4 clusters. Then, based on the pentad precipitation differences between two periods, and k-means method, clustering analysis is conducted, so the spatial pattern of the clustered pentad precipitation differences are obtained. The lower temporal resolution data may mask some of the more subtle changes. Use of different time-resolution data can sometimes lead to different conclusions.The spatial uniformity of 11-day precipitation changes clustering is better than the 5-day result. This is most likely due to the different duration of the temperature and the precipitation process. Therefore, analyzing different climatic factors calls for different time-resolution data.By analyzing the polar plots of the pentad precipitations, it is clear that the patterns of the pentad precipitation change are different in different regions and seasons, and the spatial distribution of pentad precipitation change clusters shows that there is a zonation along the longitude. Meanwhile, medians of annual precipitations of the first period and the second period are compared, indicating that the annual precipitation has increased in the most parts of Inner Mongolia. It can be concluded that the seasonal and regional precipitation difference has increased.These changes reflects the correlation of the distribution and trends of precipitation with the intensity and trends of the East Asian monsoon, as well as the complexity of precipitation characteristics in the different climatic zones in Inner Mongolia.
- pentad precipitation;
- median;
- clustering analysis;
- polar plot;
- pentad maximum precipitation

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References(26)

Figures and Tables

图 1 额尔古纳市候降水极图

(沿圆周方向弧线上的黑色箭头表示候最大中值出现时间提前或推迟, 顺时针表示推迟，逆时针表示提前)

Fig. 1 The precipitation polar plots of Erguna

(arrowheads on radial lines indicate the direction of shift, clockwise means delay, counterclockwise means advance)

DownLoad: Full-Size Img PowerPoint

Fig. 2 The spatial distribution of 5 d precipitation clusters

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Fig. 3 The spatial distribution map of 11 d precipitation clusters

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Fig. 4 5 d (a) and 11 d (b) precipitation polar plots of Tulihe

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Fig. 5 The median differences of annual precipitation between two 20-year periods (unit:mm)

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Table 1 Precipitation change between two 20-year periods

降水量变化	聚类	候的序号
明显增加	P1	1, 4, 6, 12, 16, 17, 20, 28, 35, 36, 43, 44, 48, 54, 55, 57, 58, 61, 68—71
	P2	26, 34, 35, 38, 47, 54, 57, 65, 66
	P3	28, 35, 36, 41, 44, 48, 54, 55, 68, 70
	P4	38
明显减少	P1	7, 8, 10, 14, 18, 21, 24, 26, 29, 37, 46, 53
	P2	24, 39, 44, 56
	P3	10, 18, 25, 29, 32, 37, 49, 53, 62
	P4	30, 37, 49, 59

DownLoad: Download CSV

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