Increase in Global Solar Radiation with Total Cloud Amount from 33 Years Observations in Japan

• TSUTSUMI Yukitomo

  Kumamoto Local Meteorological Observatory

• MURAKAMI Seiichi

  Sendai Aviation Weather Station

抄録

In general, a change in the total cloud amount (TCA) affects the solar irradiance at the surface as a result of on-the-way reflection of solar radiation. The amount of global solar radiation (GSR) increased globally after c.a. 1990, and this increase resulted from a decreases in the TCA and an increases in atmospheric transparency. Here we present the TCA and GSR trends categorized by the TCA for 33 years in Japan (from 1974 through 2006) on the basis of simultaneous observation from 53 weather stations. These trends are calculated using data obtained on a daily basis. The results averaged across Japan show that both GSR and TCA are increasing at the rate of 2.2% and 1.5% per decade, respectively. In most of Japan (regions further north than Kyushu), a high GSR increase rate mostly appears with a large TCA. This fact cannot be accounted for by the increase in the atmospheric transparency alone. There are two possible causes for increases in GSR and TCA in Japan: a change in cloud appearance frequency against the solar zenith angle and a decrease in cloud optical thickness.

収録刊行物

• 気象集誌. 第2輯

  気象集誌. 第2輯 90 (4), 575-581, 2012

  公益社団法人 日本気象学会

キーワード

• Atmospheric Science

詳細情報

• CRID: 1390282681480017408
• NII論文ID: 130004435168
• NII論文ID: 40019394909
• NII書誌ID: AA00702524
• DOI: 10.2151/jmsj.2012-409
• ISSN: 21869057
• ISSN: 00261165
• NDL書誌ID: 023907081
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I023907081
• Web Site: https://www.jstage.jst.go.jp/article/jmsj/90/4/90_2012-409/_pdf
• 本文言語コード: en
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