thesis topics prof. c.-p. chang tropical and monsoon meteorology focus on the area of indian...
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Thesis TopicsThesis TopicsProf. C.-P. ChangProf. C.-P. Chang
Tropical and Monsoon MeteorologyTropical and Monsoon Meteorology
Focus on the area of Indian Ocean-Asia-Focus on the area of Indian Ocean-Asia-Australia-PacificAustralia-Pacific
All topics on Weather and Climate in this areaAll topics on Weather and Climate in this area(all spatial and time scales)(all spatial and time scales)
Data Analysis (NWP analysis, satellite data)Data Analysis (NWP analysis, satellite data)
General Circulation Model SimulationGeneral Circulation Model Simulation
Current FocusesCurrent Focuses
East Asian Summer Monsoon (Meiyu weather East Asian Summer Monsoon (Meiyu weather system in China/Japan/Korea and vicinitysystem in China/Japan/Korea and vicinity
East Asian Winter Monsoon, particularly on East Asian Winter Monsoon, particularly on Maritime Continent Rainfall (Local, seasonal Maritime Continent Rainfall (Local, seasonal and climate variations of rainfall over and climate variations of rainfall over Malaysia/Indonesia and vicinity)Malaysia/Indonesia and vicinity)
Equatorial Tropical CyclonesEquatorial Tropical Cyclones
East Asian Summer East Asian Summer MonsoonMonsoon
Convective systems
Onset of phased Monsoon rainbelt
Subtropical High
MJOSCS Monsoon Onset
East Asian Winter East Asian Winter MonsoonMonsoon
MJO
Subtropical High
Convective systems
Cold Surges
EQ
110E
SINGAPORE
KUALA LUMPUR
105E
EQ
5N 5N
BORNEO ISLAND
SUMATRA ISLAND
GMS V 12/27/2001 0232 UTC
Equatorial TC: Typhoon Equatorial TC: Typhoon Vamei 2001Vamei 2001
center at 1.5N, lowest center at 1.5N, lowest latitude record latitude record
Chang et Chang et al 2003, al 2003, See See Poster Poster outside outside R251R251
A classic formation criterion: 5 degrees away A classic formation criterion: 5 degrees away from equator (e.g., Gray, 1968, Anthes, 1982)from equator (e.g., Gray, 1968, Anthes, 1982)
No TC Formation at the No TC Formation at the Equator?Equator?
The lowest latitude of previously recorded The lowest latitude of previously recorded development: Typhoon Sarah in 1956 (3.3°N)development: Typhoon Sarah in 1956 (3.3°N)
Vffdt
d )()(
Reason: Coriolis effect needed for initial spin-Reason: Coriolis effect needed for initial spin-upup
NOGAPSNOGAPS 850hPa Wind and 850hPa Wind and VorticityVorticity
(red +, green -)
+
12N
10N
8N
6N
4N
2N
EQ
2S 102E 104E 106E 108E 110E 112E
12/26/2001 22:32 UTC
BORNEO ISLAND
SUMATRA ISLAND
MALAY
PENNINSULA
QuikSCAT WindsQuikSCAT Winds
Topic on Equatorial Tropical Topic on Equatorial Tropical CycloneCyclone
Will more frequent development be Will more frequent development be observed with increased remote sensing? observed with increased remote sensing?
Can equatorial formation occur Can equatorial formation occur elsewhere? (Surges are strongest in the elsewhere? (Surges are strongest in the South China Sea). South China Sea).
Mechanism of development. Mechanism of development.
ApproachApproach
NWP gridded data: NOGAPS, NCEP, NWP gridded data: NOGAPS, NCEP, ECMWFECMWF
Scatterometer Ocean surface winds: Scatterometer Ocean surface winds: QuikSTATQuikSTAT
Satellite Data: Hourly IR, MODIS images, Satellite Data: Hourly IR, MODIS images, TRMM PR TRMM PR
– – Analyze recently observed Analyze recently observed equatorial vortices:equatorial vortices:
Typhoon Agni 2004Typhoon Agni 2004
Typhoon Agni 2004Typhoon Agni 2004
EQEQ
60E
NOGAP 1000 hPa WindNOGAP 1000 hPa Wind
EQ EQ
70E
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