Effects of Long- and Short-Term Atmospheric Water Cycles on the Water Balance over the Maritime Continent

Hironari Kanamori Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan

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Tomo’omi Kumagai Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo, and Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan

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Hatsuki Fujinami Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan

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Tetsuya Hiyama Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan

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Tetsuzo Yasunari Research Institute for Humanity and Nature, Kyoto, Japan

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Abstract

This study investigated atmospheric water cycles over several time scales to understand the maintenance processes that control heavy precipitation over the islands of the Maritime Continent. Large island regions can be divided into land, coastal, and ocean areas based on the characteristics of both the hydrologic cycle and the diurnal variation in precipitation. Within the Maritime Continent, the major islands of Borneo and New Guinea exhibit different hydrologic cycles. Large-scale circulation variations, such as the seasonal cycle and the Madden–Julian oscillation, have a lesser effect on the hydrologic cycle over Borneo than over New Guinea because the effects depend on their shapes and locations. The impact of diurnal variations on both regional-scale circulation and water exchange between land and coastal regions is pronounced over both islands. The recycling ratio of precipitation, which can be related to stronger diurnal variation in the atmospheric water cycle that results from enhanced evapotranspiration over tropical rain forests, is higher over Borneo than over New Guinea.

© 2018 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).

Corresponding author: Hironari Kanamori, kanamori@isee.nagoya-u.ac.jp

Abstract

This study investigated atmospheric water cycles over several time scales to understand the maintenance processes that control heavy precipitation over the islands of the Maritime Continent. Large island regions can be divided into land, coastal, and ocean areas based on the characteristics of both the hydrologic cycle and the diurnal variation in precipitation. Within the Maritime Continent, the major islands of Borneo and New Guinea exhibit different hydrologic cycles. Large-scale circulation variations, such as the seasonal cycle and the Madden–Julian oscillation, have a lesser effect on the hydrologic cycle over Borneo than over New Guinea because the effects depend on their shapes and locations. The impact of diurnal variations on both regional-scale circulation and water exchange between land and coastal regions is pronounced over both islands. The recycling ratio of precipitation, which can be related to stronger diurnal variation in the atmospheric water cycle that results from enhanced evapotranspiration over tropical rain forests, is higher over Borneo than over New Guinea.

© 2018 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).

Corresponding author: Hironari Kanamori, kanamori@isee.nagoya-u.ac.jp
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