The Variability of Stable Isotopes and Water Origin of Precipitation over the Maritime Continent

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Author(s)

    • Suwarman Rusmawan
    • Graduate School of Science and Technology, Kumamoto University|Atmospheric Sciences Research Group, Bandung Institute of Technology
    • Ichiyanagi Kimpei
    • Graduate School of Science and Technology, Kumamoto University|Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology
    • Yoshimura Kei
    • Atmospheric and Ocean Research Institute, the University of Tokyo
    • Mori Shuichi
    • Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology
    • Yamanaka Manabu D.
    • Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology
    • Kurita Naoyuki
    • Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology

Abstract

The seasonal water cycle features over the maritime continent were determined using water sources from seven regions produced by global Rayleigh-type circulation model. The model output was validated statistically to reproduce stable isotopes by the observed δ<sup>18</sup>O and δD content of precipitation at eight stations. The model explains the Asian-Australian monsoon circulation well and demonstrates the seasonal changes of the water origin on the basis of three climatic patterns as a signature of rainy and dry season: (1) the semi-annual pattern, seasonal changes are indicated by the raise of water vapor from Indian Ocean for rainy season and southern maritime continent for dry season (2) the anti-monsoonal pattern, represented by the alternating raise and retreat of water vapor from the southwest Pacific Ocean, southern and tropical maritime continent seas, and (3) the monsoonal pattern, characterized by the raise water vapor from the Indian Ocean and northern maritime continent sea for rainy season and southern maritime continent seas for dry season.

Journal

  • SOLA

    SOLA 9(0), 74-78, 2013

    Meteorological Society of Japan

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