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Trang 1INFORMATION ON MASTER’THESIS
1 Full name: Truong Ba Kien 2 Sex: Male
3 Date of birth: 10/7/1986 4 Place of birth: Phutho Province
5 Admission decision number: Dated
6 Changes in academic process:
7 Official thesis title:
Study effects of atmospheric-ocean interaction on track and intensity of tropical storms by HWRF model
8 Major: Meteorology and Climatology 9 Code: 60.44.87
10 Supervisors: Dr Hoang Duc Cuong - Institute of Meteorology, Hydrology and Environment - Ministry of Natural Resources and Environment
11 Summary of the finding of the thesis:
Overview the research of atmospheric-ocean interaction on track and intensity of tropical storm on the world and in Viet Nam: Ooyama (1969), Chang and Anthes (1979) showed that a significant weakening of the storm when it moves through the cold water Kerry Emanuel (1986) combinated theory and simple model to stuy atmospheric-ocean interaction on tropical storm He showed that role and effects of heat and moisture flux of ocean on tropical storm Kerry Emanuel and
Lars R.Schade (1998) used coupled atmosphere-ocean model to study storm They
showed that conditions of ocean affect on intensity of storm The SST feedback effect can reduce storm’s intensity with rapid moving typhoon and it is seem that no effect on slow moving storm Wiexing, I.Ginis (2003) studied on effect of heat flux from ocean though SST on changing intensity of tropical storm at shadow water They showed that SST have an strong influence on storm’s intensity Chau-Ron Wu
et al (2008) study intercation of tropical storm Nari with Kuroshio current when it move in to this current They indicated that storm weak when it move though cold water and powerful intensity when it move though warm water during storm’s exist Yalinfan et al (2009) studied on effects of wawes on exchanging flux between atmosphere and ocean when tropical storm happens They showed that interactions between currents and wawes on flux making storm being weaked Liu et al (2010)
Trang 2used coupled atmosphere-ocean-wave model system (WRF-POM-SWAN) to simulate intensity of storm and showed that: the atmosphere-wave relation strengthen intensity, in contrast, dynamical atmosphere-ocean relation weaken storms Total effect on intensity are determinated by postive feedback of wave and negative feedback of SST If storms move through cold water, it will be weaked Storms make areas where they move being colder In Vietnam: Le Dinh Quang
Quang (2000) studied effects of SST on tropical cyclone which being formed or
moved to the EastSea They showed roles and effects of SST on track and intensity
of tropical cyclones In generally, there is a lack of research on effects of atmosphere-ocean interaction on track and intensity of storm and those effects have not been fully understood
A coupled atmosphere-ocean model system which is called WRF-ROMS has built Three tropical storms, which are Mindulle (2010), Nock-ten and Nalgae (2011) with coupled and uncoupled (control case) atmosphere-ocean models, were studied The results show that:
The SST in coupled case are lower than the SST in control case about
2-30C at initial time, increasing by 3-40 C for 24h-term forecast, by 4-50 C for 72h -term forecast
The pressure at sea level of couplde case are higher than one in control case about 2-3 mb for 12h-term forecast, increase by 6-8 mb for 24h-term forecast, increasing rapidly for 48h and 72h-term forecast corresponding approximately
14-15 mb and 22-24 mb
The averaged wind speed at surface of couple case is weaker than one in control case
The heat-moisture flux in couple case is lower than one in control case
In two cases, simulated storms moved faster than observated ones The cross track error of couple case are lower than one in control case In the coupled case, simulated storms is more left than observated ones In the control case, simulated storms is more right than observated ones
Trang 3The Slpmin in the control case is higher than the Slpmin in the observation for 12h-term forecast For other term, slpmin is lower than slpmin in the observation SST is continously updated every ten minutes from ROMS model on the WRF model, causing the SST in the coupled case is lower than the SST in the uncoupled case (SST is automatically used from Global Forecast Model - GFF) Similar to surface wind, air pressure and heat-moisture flux in the coupled case are lower than ones in the control case
In conclusion, storm intensity in the coupled case is lower than storm intensity in the uncoupled case
12 Practical applicability: The study is highly practical and can be applied for storm forecast in Vietnam
13 Further research directions: study on deeply atmospheric-ocean interaction to tropical cyclones
14 Thesis-related publications:
Date: 07 th , June, 2012
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