Characteristics of Wind Direction Change in China During Recent 50 Years

Jiang Ying; Luo Yong; Zhao Zongci

Vol.19, NO.6, 2008

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2008 > 19(6): 666-672

Jiang Ying, Luo Yong, Zhao Zongci. Characteristics of wind direction change in China during recent 50 years. J Appl Meteor Sci, 2008, 19(6): 666-672.

Citation:

Jiang Ying, Luo Yong, Zhao Zongci. Characteristics of wind direction change in China during recent 50 years. J Appl Meteor Sci, 2008, 19(6): 666-672.

Jiang Ying, Luo Yong, Zhao Zongci. Characteristics of wind direction change in China during recent 50 years. J Appl Meteor Sci, 2008, 19(6): 666-672.

Citation:

Jiang Ying, Luo Yong, Zhao Zongci. Characteristics of wind direction change in China during recent 50 years. J Appl Meteor Sci, 2008, 19(6): 666-672.

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Characteristics of Wind Direction Change in China During Recent 50 Years

1.
Nanjing University of In formation Science & Technology, Nanjing 210044
2.
National Climate Center, Beijing 100081

Received Date: 2008-03-03
Rev Recd Date: 2008-05-28
Publish Date: 2008-12-31

Abstract

Abstract

With the development of wind power industries, much attention is paid to the issues of the wind power's sustainable utilization against the global warming background. The stability of wind directions is very important to the effective availability of wind energy resources. The stability of the prevailing wind directions is not only able to enhance the availability rate of the wind energy, but also the life of wind turbogenerators can be prolonged. Therefore, the characteristics of the wind direction changes for the last 50 years in China are focused on. Based on the observation data sets of both wind speed and wind direction in the baseline and standard stations of China of four times per day, the wind data of 488 stations during 1956--2005 are chosen, the changes of wind directions in China for the last 50 years are analyzed. 16 wind directions are used. The statistic methods are employed to analyze the characteristics of the seasonal and annual wind directions, maximum wind directions and prevailing wind directions at each station in 12 sub-regions in China.It is found that the frequencies of the annual prevailing wind directions have decreasing trends, especially in North China, northwestern and southwestern China. There are slightly increasing trends in a few areas in West China. The wind speeds corresponding to the annual prevailing wind directions in most regions of China decrease much more obviously than the decreasing trends of the annual mean wind speeds. It indicates that the reducing annual mean wind speeds are mainly caused by the decreasing annual prevailing wind speeds. Both northerly wind (winter) and southerly (summer) prevailing winds in China decrease significantly. The reducing prevailing wind in China is lead to by the decreasing Asian winter and summer monsoon.
- wind direction;
- wind speed;
- climate change

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References(21)

Figures and Tables

图 1 1956-2005年我国年最大风向频率 (单位:%) (a) 及其对应的平均风速 (单位:m/s) (b) 分布图

Fig. 1 The mean distributions of the annual maximum wind direction frequency (unit :%)(a) and its wind speeds (unit :m/ s)(b) during 1956-2005

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图 2 1956-1965年与1996-2005年我国年最大风向频率差值 (单位:%)(a) 及其对应的平均风速差值 (单位:m/ s; 阴影区域为通过90%信度t检验区域) (b) 分布图

Fig. 2 The difference distributions between 1956-1965 and 1996-2005 of the annual maximum wind direction frequency (unit :%) (a) and its wind speeds (unit:m/ s; shadow regions denote pas sing 90% level test) (b)

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图 3 分区示意图

Fig. 3 Sub-regions' sketch map

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图 4 1956-2005年我国各区域年最大风向频率演变图

Fig. 4 Evolutions of the annual maximum wind directions frequency for sub-regions in China during 1956-2005

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表 1 1956-2005年全国各区域年最大频率风向日数及其对应平均风速变化趋势

Table 1 Linear trends of the annual maximum wind direction frequency and its mean wind speeds in sub-regions during 1956-2005

表 2 1956-2005年我国各区域季节最大风向频率日数变化趋势 (单位:d/10a)

Table 2 Linear trends of the seasonal maximum wind direction frequency in sub-regions in China during 1956-2005 (unit:d/10a)

表 3 1956-2005年我国各区域季节最大风向频率对应平均风速变化趋势 (单位:m·s^-1/10a)

Table 3 Linear trends of seasonal maximum wind direction frequency in sub-regions in China during 1956-2005(unit:m · s ^-1/ 10a)

表 4 1956-2005年各区域冬季偏北风和夏季偏南风日数变化趋势 (单位:d/10a)

Table 4 Linear trends of winter and summer prevailing wind days during 1956-2005(unit :d/10a)

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