Monsoon System Study Working Group What progress has been made in the GAME PhaseI and what will be d

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ltMonsoon System Study Working GroupgtWhat
progress has been made in the GAME Phase-I and
what will be done in the GAME Phase-II?
GISP-II meeting, Tokyo, November 6, 2002
By Jun Matsumoto,
Univ. Tokyo

• National Working Group Members
• Jun Matsumoto (Univ. Tokyo),
• Hiroaki Ueda (Univ. Tsukuba),
• Ryuichi Kawamura (Toyama Univ.),
• Yasumasa Kodama (Hirosaki Univ.),
• Masato Shinoda (Tokyo Metrop. Univ.),
• Yukari Takayabu (Univ. Tokyo)
• International Working Group Member
• Johnny C. L. Chan (Hong Kong City Univ.)
• GISP member

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What will be done in the GAME Phase-II?

• Full utilization of the GAME data-sets
  (re-analysis, satellite, upper and surface
  observations)
• Cross-cutting large-scale analysis over several
  intensive observation regions.
• Heating processes in the Asian monsoon seasonal
  transition
• Role of land surface through heat and
  moisture budget analysis
• Quantitative estimation of Asian monsoon
  heat sources
• Interaction between mid- and low- latitude
  systems
• Relationship between Baiu/monsoon activity and
  convection over the Tibetan Plateau
• Relationship between Typhoon activity and SE
  Asian monsoon
• Quantitative estimation of precipitation system
  in the monsoon seasonal cycle

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Plan for Monsoon System Study in GAME-IIBy Prof.
Jun Matsumoto Prof. Johnny C. L. Chan,
GISP-II Nov. 7, 2002

• Main target Pre-monsoon and monsoon onset
  processes
• How Organize national (Japanese) workshop
• in February, 2003
• Organize international workshop (In early
  November, 2003) with GISP meeting and GAME-T2
  Workshop in Thailand co-organized with SCSMEX
  Project Office
• Include satellite and re-analysis related studies
  
• Organize regional studies/collaborations with
  Indochina countries
• Write a review paper on pre-monsoon and monsoon
  onset processes

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Activity of GAME-II Monsoon System Study in 2003
By Prof. Jun Matsumoto GISP-II Nov. 10,
2003

• Organize national (Japanese) workshop February
  5-6 (21 oral presentations)
• Make presentation in the CEOP/GEWEX Workshop on
  the role of the Himalayas and the Tibetan Platesu
  within the Asian monsoon April 7-8, Milan,
  Italy
• Organize special session on Understanding of
  onset mechanizm of tropical Asian monsoon in the
  spring meeting of the Meteorological Society of
  Japan May 24 (5 oral presentations)
• Organize international workshop (November 11)
  after the GISP meeting in conjunction with
  GAME-T2 Symposium in Thailand co-organized with
  SCSMEX Project Office (17 oral 15 posters)

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Summary of GAME-II National Monsoon System
Workshop at Kyoto February 5-6, 2003

• Main topic Monsoon onset
• Findings
• Monsoon onset is a transition from dry (shallow)
  monsoon to wet (deep) monsoon.
• Heating over the surrounding ocean in the
  pre-monsoon period is important for both
  Australian and Indian monsoon onset.
• Process of onset over Indochina and India may be
  different.
• Questions
• What triggers the sudden onset?
• What is the role of the Tibetan Plateau?
• Is the inversion layer over Indochina contribute
  for the onset?
• What is the main factor causing difference of the
  monsoon onset in each continent?
• Is there any the relationship with the
  surrounding dry region?
• Key words for future study
• Land-sea distribution, Role of vegetation, Moist
  process

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(1/5)
Heat and moisture balance around the Tibetan
Plateau using GAME-Reanalysis ?-coordinate(s-p
hybrid coordinate) data (H. Ueda, H. Kamahori,
N. Yamazaki, 2003, Journal of Climate, 16,
2309-2324)
? Method
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(2/5)
E-W cross section
Positive Q1
PositiveQ2
Imply condensation process
Ueda et al. (2003), Journal of Climate, 16
2309-2324
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Premonsoon circulation anomalies
NCEP/NCAR Reanalysis
850hPa
Enhanced subsidence
Ascending motion over the inland
700hPa
Decreased mixing ratio
Development of thermal high
(Kawamura et al., 2002 JGR)
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A mechanism of the onset of the Australian summer
monsoon
Kawamura et al. (2002 JGR)
?Importance of air-sea feedback processes ?Dry
intrusion into the layer at 700 hPa
level ?Inhibition of convection due to subsidence
(Kawamura et al., 2002 JGR)
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700-hPa mixing ratio and height
Development of thermal high
Low mixing ratio
Increased mixing ratio associated with deep
convection
(Kawamura et al., 2003 JMSJ)
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Method for Colored Moisture Analyses
Tag spatial attribution onto evaporated
waterSea60,Land20
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Temporal variation on Bangkok
?Onset Withdrawal?
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Onset and withdrawal of Asian summer monsoon
using MRI-OAGCMBy Akio Kito K. Rajendran
(Climatological Lab., MRI) Rajendran and Kitoh
(2003) J.Climate (Submitted)

• MRI CGCM2
• AGCM
• MRI/JMA98
• T42 (2.8x2.8), L30 (top at 0.4 hPa)
• Longwave radiation - Shibata and Aoki (1989)
• Shortwave radiation - Shibata and Uchiyama (1992)
• Cumulus - Prognostic Arakawa-Schubert type
• PBL - Mellor and Yamada level 2 (1974)
• Land Surface - L3SiB or MRI/JMA_SiB
• OGCM
• Resolution 2.5x(0.5-2.0), 23layers
• Eddy mixing Isopycnal mixing, GM
• Sea ice Mellor and Kantha (1989)
• Coupling
• Time interval 24hours
• With/without flux adjustment

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Onset Pentad the Julian pentad in which the
relative climatological pentad mean rainfall rate
exceeds 4 mm/day.
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Seasonal Variation of climatological pentad mean
precipitation
70E-90E
110E-120E
120E-140E
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Simulation of 1998 Monsoon Onset over Southeast
Asia with a Regional Climate Model Koji Dairaku
Atmospheric Environment Division National
Institute for Environmental Studies E-mail
dairaku.koji_at_nies.go.jp International
Symposium on the Climate System of Asian Monsoon
and its Iteraction with Society Sofitel Raja
Orchid Hotel, Khon Kaen, Thailand, 11 13
November 2003
07/11/2003
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Simulation of 1998 Monsoon Onset with RAMS
H
Averaged to the 10 by 15 degree area (lat 10-20,
lon 95-100)
07/11/2003
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Seasonal changes of lightning activity observed
by TRMM-LISby Yasumasa Kodama, Akihiro Ohta et
al., 2003
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Pre-monsoon rains in Thailand
Jun MATSUMOTO and Masashi KIGUCHI Dept. of
Earth Planetary Science, University of Tokyo,
JAPAN
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Climatological pentad rainfall
Average onset
Abrupt onset in India
Gradual onset in Thailand

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Rainfall
Monsoon onset
Daily rainfall (March-May, 1998)
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Monsoon onset
Height anomaly at 300 hPa
W
Zonal moisture flux at 925 hPa
E
Moisture conv. at 925 hPa
Precipitable water by GPS
Precipitation
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Comparisons of seasonal changes of sensitive and
latent heat flux over India (red) and Thailand
(blue)
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Plan for Monsoon System Study in GAME-II
GISP-II Nov. 10, 2003 By Prof. Jun Matsumoto

• Main target Pre-monsoon and monsoon onset
  processes
• How Organize national (Japanese) workshop
• February (?), 2004
• Organize international workshop (In November,
  2004, at Kyoto) with GISP and GAME Scientific
  meeting
• Organize regional studies/collaborations with
  Indochina countries
• Write a review paper on pre-monsoon and monsoon
  onset processes