Japan Geoscience Union Meeting 2015

Presentation information

International Session (Oral)

Symbol A (Atmospheric and Hydrospheric Sciences) » A-CG Complex & General

[A-CG06] Asian monsoon hydroclimate

Tue. May 26, 2015 11:00 AM - 12:45 PM 101A (1F)

Convener:*Jun Matsumoto(Deaprtment of Geography, Tokyo Metropolitan University), Taikan Oki(Institute of Industrial Science, The University of Tokyo), Atsushi Higuchi(Center for Environmental Remote Sensing (CEReS), Chiba University, Japan), Shinjiro Kanae(School of Engineering, Tokyo Institute of Technology), Hiroshi Takahashi(Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University), Chair:Atsushi Higuchi(Center for Environmental Remote Sensing (CEReS), Chiba University, Japan)

11:20 AM - 11:35 AM

[ACG06-02] MJO role on Intraseasonal variation of stable isotope of Precipitation in Indonesia Maritime Continent

*Halda aditya BELGAMAN1, Kimpei ICHIYANAGI1, Masahiro TANOUE2, Rusmawan SUWARMAN3, Kei YOSHIMURA4, Shuichi MORI5, Naoyuki KURITA6 (1.GSST Kumamoto Univ., 2.School of Engineering, The University of Tokyo, 3.Bandung Institute of Technology, 4.AORI, The Univ. of Tokyo, 5.JAMSTEC, Japan, 6.Nagoya Univ.)

Keywords:asian monsoon disturbance, stable isotope, Madden Julian Oscillation, moisture transport analysis

MJO (Madden-Julian Oscillation) is one of the disturbances for Asian Monsoon in the Maritime Continent Area. Intraseasonal variability of precipitation in the Indonesia Maritime Continent (IMC) is mainly due to The Madden-Julian Oscillation (MJO), cold surge, or other synoptic scale disturbance. This study examined the relationship between MJO and stable isotope in precipitation over the IMC. Observation and simulation model data from isotope circulation model was used. From 2001 - 2009, 10 main MJO events were detected and 6 of the event occurred at Boreal Winter season (Asian Monsoon). Temporal and spatial analysis from simulated stable isotopes model reveals that isotopic variation is correlated to MJO event in different phase for different stations. Generally, δ18O in precipitation became lighter in most observation station at phase 3, 4 and 5 at western part of IMC, and phase 4, 5, and 6 at north east part of IMC. Spatial distribution of δ18O in precipitation for each MJO phase show that mainly MJO governed δ18O variability in intraseasonal timescale for IMC area. Further investigation showed clear signal of MJO in δ18O was observed at Bukit Tinggi (GAW) station only; it is confirmed with result from Isotope Circulation Model (ICM). When MJO is in active phase (enhanced) precipitation in western part of IMC, precipitable water was came from Indian Ocean and South IMC Ocean.