熱帯降雨観測衛星TRMMを用いたアフリカ大陸熱帯域における雷活動と降水の季節変化

• 内山 真悟

  首都大学東京大学院地理環境科学専攻

• 松本 淳

  首都大学東京大学院地理環境科学域/海洋研究開発機構地球環境変動領域

• 高橋 洋

  首都大学東京大学院地理環境科学域/海洋研究開発機構地球環境変動領域

• 金森 大成

  名古屋大学地球水循環研究センター

書誌事項

タイトル別名

• Seasonal Variations of Lightning Activity and Rainfall over Tropical Africa Based on Tropical Rainfall Measuring Mission (TRMM) Satellite Observations
• ネッタイ コウウ カンソク エイセイ TRMM オ モチイタ アフリカ タイリク ネッタイイキ ニ オケル ライ カツドウ ト コウスイ ノ キセツ ヘンカ

抄録

 We analyzed seasonal variations of lightning activity in continental tropical Africa using 10-day, monthly, and seasonal data observed by the Tropical Rainfall Measuring Mission (TRMM) satellite. The data collected were flash counts obtained with Lightning Imaging Sensor (LIS), and total rainfall, convective rainfall, and stratiform rainfall obtained with Precipitation Radar (PR) for the 10-year period 1998-2007.<br> The overall flash count migrates seasonally and meridionally following the solar angle, while it is abundant throughout the year at low latitudes near the equator. Flash count maximum areas generally occur over mountainous regions and the maximum frequency is observed in the Mitumba Mountains east of the Congo Basin. The flash count is also high in the central Congo Basin regardless of season. In the central region (7.5–12.5°N, along 20–22.5°E) of the African Continent, another maximum flash count area is observed during the period May–October. The maximum zone of total rainfall from May to August occurs between these two maxima of the flash count. The peak region of the flash count from December to March does not coincide with that of total rainfall. The maximum region of the flash count occurs from the equator to 2.5°S, while that of total rainfall occurs between 7.5° and 12.5°S. The maximum region of the flash count and total rainfall in January and March is separated by about 10° of latitude.<br> Along 22.5°E, in the central region of the African Continent, the flash count at 10°N is higher both at the beginning and final stages of the warm season rainfall. In contrast, the flash count is high only at the beginning of the warm season rainfall at 10°S. The beginning of warm season rainfall relative to the solar angle is 2 months earlier at 10°S.

収録刊行物

• 地学雑誌

  地学雑誌 121 (6), 986-997, 2012

  公益社団法人 東京地学協会

キーワード

• 熱帯降雨観測衛星
• 雷活動
• 雷観測装置
• コンゴ盆地
• ミトゥンバ山地

詳細情報

• CRID: 1390001204237593344
• NII論文ID: 130003373628
• NII書誌ID: AN00322536
• DOI: 10.5026/jgeography.121.986
• ISSN: 18840884
• ISSN: 0022135X
• NDL書誌ID: 024188980
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I024188980
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可