日本地球惑星科学連合2016年大会

講演情報

インターナショナルセッション(口頭発表)

セッション記号 A (大気水圏科学) » A-CG 大気水圏科学複合領域・一般

[A-CG08] Continental-Oceanic Mutual Interaction: Global-scale Material Circulation through River Runoff

2016年5月23日(月) 09:00 〜 10:30 A04 (アパホテル&リゾート 東京ベイ幕張)

コンビーナ:*山敷 庸亮(京都大学大学院総合生存学館)、升本 順夫(東京大学大学院理学系研究科)、宮澤 泰正(独立行政法人海洋研究開発機構)、Behera Swadhin(Climate Variation Predictability and Applicability Research Group, Application Laboratory, JAMSTEC, 3173-25 Showa-machi, Yokohama 236-0001)、山形 俊男(海洋研究開発機構 アプリケーションラボ)、寶 馨(京都大学防災研究所)、座長:升本 順夫(東京大学大学院理学系研究科)、Behera Swadhin(Japan Agency for Marine-Earth Science and Technology)、山形 俊男(海洋研究開発機構 アプリケーションラボ)

10:15 〜 10:30

[ACG08-06] 熱帯域における沿岸降水気候学

*荻野 慎也1山中 大学1森 修一1松本 淳1,2 (1.海洋研究開発機構大気海洋相互作用研究分野、2.首都大学東京都市環境学部)

キーワード:降水、熱帯、沿岸域

Motivated by observational evidence of rainfall concentration near tropical coastlines with diurnal cycle, we quantified annual mean precipitation amount in the tropics (latitudes lower than 37º) obtained as a function of coastal distance, and compared them between land and ocean sides (Ogino et al., 2016). The data is from the Tropical Precipitation Measurement Mission (TRMM). Precipitation amount peaks at the coastline and decreases rapidly over a distance of 300 km from the coastline on both sides of the coastline (Fig. 1). The precipitation inside the “coastal region” (defined by distance <300 km from the coastline) accounts for approximately 34% of the total over the whole tropics, while that outside the coastal region accounts for 52% and 14% on the ocean and land sides, respectively. Since the coastal regions are about 29% of the total tropical areas, the precipitation per unit area inside the coastal regions is higher than that outside. Examining the grid number variation in the coastal regions with respect to the annual precipitation amount resulted in the finding that more than 90% of the annual precipitation with the amount of 3500 mm/yr or more occurs exclusively in the coastal regions, indicating that precipitation systems unique to coastal regions are needed for producing the highest annual precipitation on the Earth. The results above were obtained from the precipitation data over the whole tropics. The regional difference will be discussed in the presentation.
References
Ogino, S.-Y., M. D. Yamanaka, S. Mori, and J. Matsumoto (2016), How much is the precipitation amount over the tropical coastal region?, J. Clim., 29(3), 1231–1236, doi:10.1175/JCLI-D-15-0484.1., http://journals.ametsoc.org/doi/abs/10.1175/JCLI-D-15-0484.1