Climatological Calculation and Characteristic Analysis of Global Radiation over Wuxi Region

Zhang Yunlin; Qin Boqiang; Chen Weimin; Hu Weiping

Vol.14, NO.3, 2003

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2003 > 14(3): 339-347

Zhang Yunlin, Qin Boqiang, Chen Weimin, et al. Climatological calculation and characteristic analysis of global radiation over Wuxi region. J Appl Meteor Sci, 2003, 14(3): 339-347.

Citation:

Zhang Yunlin, Qin Boqiang, Chen Weimin, et al. Climatological calculation and characteristic analysis of global radiation over Wuxi region. J Appl Meteor Sci, 2003, 14(3): 339-347.

Zhang Yunlin, Qin Boqiang, Chen Weimin, et al. Climatological calculation and characteristic analysis of global radiation over Wuxi region. J Appl Meteor Sci, 2003, 14(3): 339-347.

Citation:

Zhang Yunlin, Qin Boqiang, Chen Weimin, et al. Climatological calculation and characteristic analysis of global radiation over Wuxi region. J Appl Meteor Sci, 2003, 14(3): 339-347.

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Climatological Calculation and Characteristic Analysis of Global Radiation over Wuxi Region

1.
Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008
2.
School of Graduate, Chinese Academy of Sciences, Beijing 100039

Received Date: 2002-02-05
Rev Recd Date: 2002-05-15
Publish Date: 2003-06-30

Abstract

Abstract

The variation of global solar radiation reaching the surface over the Wuxi region and its calculation are studied for further understanding of the solar transfer on water-air interface and the underwater irradiance. The main methods and formulas for climatological calculation of global radiation are simply discussed. Based on the observation data of global radiation and relative sunshine at Shanhai, Nanjing, Hangzhou stations, the empirical coefficients for these stations are calculated by using the least square method. The coefficient for the Wuxi region is calculated through interpolation from the coefficients of the three stations. The climatological calculation formula, which is suitable for Wuxi region, is brought forward. The global radiation reaching the surface is gained by using the formula and relative sunshine data at Wuxi station in recent 40 years. The formula precision is checked up by use of the observation data from the Taihu Lake ecosystem research station, which is proved to credible. At last, by analyzing the calculation results, the characteristics and causes of global radiation variation are discussed. The results show that the global radiation has decreased in the past 40 years and the decrease mainly attributed to the increase of suspended matter in the atmosphere. The annual variation of global radiation is basically similar to extraterrestrial irradiation except some differences in summer. These differences are caused by Meiyu with greater precipitation, cloud cover and less sunshine.
- Wuxi region;
- Solar global radiation;
- Relative sunshine;
- Climatological calculation

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References(14)

Figures and Tables

图 1 太湖无锡地区太阳总辐射年平均日总量计算值及总云量的多年变化 (1961~2000年)

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图 2 太湖无锡地区1961~2000年总云量、低云量距平值变化曲线

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图 3 天文辐射、总辐射计算值及总云量年内变化

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图 4 太湖无锡地区近40年来日照百分率的逐年变化

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表 1 天文辐射、实际总辐射日总量、日照百分率每月多年平均值 (1961~2000年)

表 2 经验系数a，b每月多年平均值

表 3 经验系数a，b每5年年平均值

表 4 无锡站经验系数a，b每月多年平均值

表 5 太阳总辐射计算值、实测值及相对误差

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