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Journal of Geographical Sciences

, Volume 13, Issue 1, pp 97–104 | Cite as

Analysis of solar radiation variations over Nanjing region in recent 40 years

  • Zhang Yunlin 
  • Qin Boqiang 
  • Chen Weimin 
Natural Resources and Environmental Change

Abstract

The data utilized in this analysis consisted of extraterrestrial radiation, global radiation, diffuse radiation, direct radiation, total cloud cover and relative sunshine. The annual variations and trend were analyzed for monthly mean daily total global, direct, and diffuse radiation on a horizontal surface and for the relations between global, direct, diffuse radiation and relative sunshine, total cloud cover. The climatological calculation equations of global and direct radiation are put forward. The results show that global and direct radiations are characterized by decrease and diffuse radiation by increase. The main causes are due to the increase of concentration of suspended particles and atmospheric turbidities rather than cloud cover variations.

Key words

Nanjing region global radiation direct radiation diffuse radiation relative sunshine 

CLC number

P422.1 

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Copyright information

© Springer 2003

Authors and Affiliations

  1. 1.Nanjing Institute of Geography and LimnologyCASNanjingChina

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