Observation and estimation of photosynthetic photon flux density in Southern China

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• 作者：Zhongmin Zhu ; Lunche Wang ; Wei Gong ; Yu Xiong ; Bo Hu
• 刊名：Theoretical and Applied Climatology
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：120
• 期：3-4
• 页码：701-712
• 全文大小：2,208 KB
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• 作者单位：Zhongmin Zhu (1)
  Lunche Wang (2) (3)
  Wei Gong (2) (3)
  Yu Xiong (4)
  Bo Hu (5)
  
  1. Huazhong University of Science and Technology Wuchang Branch, Wuhan, 430064, China
  2. State Key Laboratory of Information Engineering in Surveying, Mapping, and Remote Sensing, Wuhan University, Wuhan, Hubei, China
  3. International Research Center of Satellite Remote Sensing and Atmospheric Monitoring, Wuhan University, Wuhan, Hubei, 430079, China
  4. Key Laboratory of High-voltage Field-test Technology of State Grid Corporation, Beijing, China
  5. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Meteorology and Climatology
  Atmospheric Protection, Air Quality Control and Air Pollution
  Climate Change
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  
• 出版者：Springer Wien
• ISSN：1434-4483

文摘

Observations of photosynthetically active radiation (PAR) and global solar radiation (G) at Sanya, Southern China during 2005-011 were used for investigating their relationships under various sky conditions. Monthly mean PAR generally increased from 24.73?mol?m??day? in December to 40.97?mol?m??day? in July with annual mean value being about 32.88?mol?m??day?. Monthly mean daily PAR fraction (F _p) changed from 1.82?mol?MJ? in March (or April) to 2.03?mol?MJ? in October with annual mean being 1.90?mol?MJ?. Clearness index (K _t) was used for characterizing sky conditions and partly cloudy skies (41.45?%) were the dominated sky condition in this area. Meanwhile, an efficient PAR model has been introduced by investigating the dependence of PAR on K _t and cosine of solar zenith angle under any sky conditions. The model has been tested at Sanya, Lhasa, and Inner Mongolia, China through the statistical indices: mean bias error (MBE), mean absolute percentage error (MAPE), and root–mean–square error (RMSE), which were generally lower than ?.6, 8.24, and 10.26?%, respectively. PAR values during 1992-012 were then reconstructed and it was discovered that annual mean PAR decreased at the rate of ??mol?m??day? per decade.