National Working Group Members : Jun Matsumoto* (Univ. Tokyo), Hiroaki Ueda* (Univ. Tsukuba),
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Transcript of National Working Group Members : Jun Matsumoto* (Univ. Tokyo), Hiroaki Ueda* (Univ. Tsukuba),
<Monsoon System Study Working Group>
What 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
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 se
asonal cycle
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
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)
Summary of GAME-II National Monsoon System Workshop at Kyoto February 5-6, 2003
Main topic: Monsoon onsetFindings:• 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
(1/5)
Heat and moisture balance around the Heat and moisture balance around the Tibetan Plateau using GAME-ReanalysisTibetan Plateau using GAME-Reanalysis η-cη-c
oordinateoordinate(( σ-p hybrid coordinateσ-p hybrid coordinate ) ) datadata
((H. Ueda, H. Kamahori, N. Yamazaki, H. Ueda, H. Kamahori, N. Yamazaki, 2003, Journal of Climate, 16, 2309-23242003, Journal of Climate, 16, 2309-2324))● Method
Tt
VT RdCpP
k
dpdt Ý T
Q
1Cp
qt
Vq Ý q
Q2
Lcdpdt
Vk pk1/ 2 l (Vllk
k max
pl) (Vk )pk
2 , (3)
( Ý p
)k 1 2
pk 1 2
t (Vl
lk
k max
pl ), (5)
( Ý T
)
1
2pk
( Ý p
)k 1 2 (Tk 1 Tk ) ( Ý p
)k 1 2 (Tk Tk1 )
(6)
Ueda et al. (2003), Journal of Climate, 16 2309-2324
(2/5)
E-W cross section
PositiveQ2
Positive Q1
Imply condensation process
Premonsoon circulation anomalies NCEP/NCAR Reanalysis
Enhanced subsidence
Ascending motion over the inland
Development of thermal high
Decreased mixing ratio
850hPa
700hPa
(Kawamura et al., 2002; JGR)
A mechanism of the onset of theAustralian summer monsoon
●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)
(Kawamura et al., 2002; JGR)
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)
Tag spatial attribution onto evaporated water
Sea:60, Land:202D grid-plume model (vertical one layer)
Fully mix in a timestep (10 min.)Variables (Q, W, P, E) are
externally given.
EP
QUin QUout
QVout
QVin
W1.25˚x1.25˚
Method for Colored Moisture Analyses
Indian Ocean
Pacific Ocean
IndochinaPen.
BengalGulf
Contents of water on todayare analyzed
Sudden increase of Indian Ocean
May 17
Retrieval of Indian Ocean
Sep. 28
Onset
Withdrawal
Temporal variation on Bangkok
Onset and withdrawal of Asian summer Onset and withdrawal of Asian summer monsoon using MRI-OAGCMmonsoon using MRI-OAGCM
By By Akio Kito & K. Rajendran (Akio Kito & K. Rajendran (Climatological Lab., MRI) Climatological Lab., MRI) Rajendran and Kitoh (2003) J.Climate (Submitted)Rajendran and Kitoh (2003) J.Climate (Submitted)
MRI CGCM2•AGCMAGCM
–MRI/JMA98MRI/JMA98–T42 (2.8x2.8), L30 (top at 0.4 hPa)T42 (2.8x2.8), L30 (top at 0.4 hPa)–Longwave radiation - Shibata and Aoki (1989)Longwave radiation - Shibata and Aoki (1989)–Shortwave radiation - Shibata and Uchiyama (1992)Shortwave radiation - Shibata and Uchiyama (1992)–Cumulus - Prognostic Arakawa-Schubert typeCumulus - Prognostic Arakawa-Schubert type–PBL - Mellor and Yamada level 2 (1974)PBL - Mellor and Yamada level 2 (1974)–Land Surface - L3SiB or MRI/JMA_SiBLand Surface - L3SiB or MRI/JMA_SiB
•OGCMOGCM–Resolution : 2.5x(0.5-2.0), 23layersResolution : 2.5x(0.5-2.0), 23layers–Eddy mixing : Isopycnal mixing, GMEddy mixing : Isopycnal mixing, GM–Sea ice : Mellor and Kantha (1989)Sea ice : Mellor and Kantha (1989)
•CouplingCoupling–Time interval : 24hoursTime interval : 24hours–With/without flux adjustmentWith/without flux adjustment
Onset Pentad: the Julian pentad in which the relative climatological pentad mean Onset Pentad: the Julian pentad in which the relative climatological pentad mean rainfall rate exceeds 4 mm/day.rainfall rate exceeds 4 mm/day.
Seasonal Variation of climatological pentad mean precipitationSeasonal Variation of climatological pentad mean precipitation
70E-90E70E-90E
110E-120E110E-120E
120E-140E120E-140E
07/11/2003
Simulation of 1998 Monsoon Onset over Southeast Asia with a Regional Climate Model
Koji Dairaku
Atmospheric Environment DivisionNational Institute for Environmental Studies
E-mail: [email protected]
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
H
07/11/2003
0
3
6
9
12
15
4/ 1 4/ 11 4/ 21 5/ 1 5/ 11 5/ 21
mm
/day
Obs(GPCP)Obs(CMAP)CTLNOMNT
Simulation of 1998 Monsoon Onset with RAMS
Averaged to the 10 by 15 degree area (lat 10-20, lon 95-100)
Seasonal changes of lightning activity observed by TRMM-LIS
by Yasumasa Kodama, Akihiro Ohta et al., 2003
Pre-monsoon rains in Pre-monsoon rains in ThailandThailand
*Jun MATSUMOTO and Masashi KIGUCHI
Dept. of Earth & Planetary Science, University of Tokyo,
JAPAN
Climatological pentad rainfall
Average onset
•
Average onset
Abrupt onset
in India
Gradual onset
in Thailand
Rainfall
Daily rainfall (March-May, 1998)
Monsoon onset
Height anomaly at 300 hPa
Zonal moisture flux at 925 hPa
Moisture conv. at 925 hPa
Precipitable water by GPS
Precipitation
Monsoon onset
E
W
Comparisons of seasonal changes of sensitive and latent heat flux over India (red) and Thailand (blue)
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