Tim Li
• initial hire in March 1999, joint IPRC-MET faculty
• 1 PhD & 1 MS students graduated, 4 current PhD students
• Major research topics
1. Tropical cyclone dynamics and modeling
2. Monsoon climate variability
3. Tropical atmosphere-ocean interactions (ENSO, IOD, TBO)
4. 4DVar data assimilation (satellite data application)
Current research grants as a PI:
ONR, Toward the development of tropical cyclone ensemble forecast and cyclogenesis modeling and forecast for the DOD’s JTWC, 6/1/2003-12/31/2007, $500,000.
UCAR/NCAR, Implementation of multi-increment, adjoint optimization and lateral boundary control in WRF 4D-Var, 11/1/2006-1/31/2008, $106,692.
DoD/PET, Improving the COAMPS atmospheric variational data assimilation system with direct use of satellite radiances. 6/1/2007-5/31/2008, $75,000
ONR, Western Pacific tropical cyclone reanalysis with the NRL NAVDAS. 1/1/2007-12/31/2008, $221,415.
NOAA/PRIDE, High-Resolution Atmospheric and Surface Wind Stress/Thermal Fluxes Products for the Hawaiian Islands and the Surrounding Oceans, $125,000 (7/1/2006-6/30/2008).
NRL, Dynamics of tropical cyclone intensity change, 9/1/2006 – 8/31/2009, $148,933.
Current operational center problem in TC initializationNCEP Official Analysis vs. Observation: Francis (left) and Ivan (right) in 2004
MODIS Image of IVAN (From CIMSS web site) , 200409141635; 931hPa; 60 m/s
NCEP Final Analysis of IVAN, 200409141800; 980hPa; 40 m/s
SLP and Surface Wind Fields from NCEP Analysis; 1002 hPa; 35 m/s
NASA Aqua Image for Hurricane Francis (2004); 945 hPa; 60 m/s
4DVar Data Assimilation for Typhoons with use of latest satellite products
Black line: Observed TC minimum central pressure
Red line: UH 4DVar data assimilation reanalyzed TC intensity
Blue line: NCEP operational model final analysis
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wp7 wp9 wp10 wp12 wp16 wp18 wp19 wp20 wp22 wp25 wp26 wp27
NCEP
TC-RA
Typhoon intensity bias
PRIDE for Hawaii Region
•Domain-1: 250x200x41, 18 km•Domain-2: 160x120x41,6 km
We are using: • WRF + WRFVAR
• Background: 1. NCEP final analysis or NCEP global forecast
• Observations: 1. Radiosondes: TTAA, TTBB, PPBB, etc. 2. Surface obs: SYNOPS, METARS, AWS, ships, buoys, CMAN 3. Profiler: 4. Sat winds: GOES, METSAT, MODIS, AVHRR 5. Satem 6. Aircraft: PIREPS, AIREPS, AMDAR, ACARS 7. Dropsondes and "hurricane hunter" obs 8. Quikscat 9. Ground-based GPS PW 10. COSMIC GPS refractivity
Analysis Domains:
Forcing for HYCOM-Sample 2007081018Forcing for HYCOMQV at 2 M
TEMP at 2 M
U at 10 M
V at 10 M
SEA SURFACE TEMPERATURE
SURFACE SKIN TEMPERATURE
TIME-STEP CUMULUS PRECIPITATION
TIME-STEP NONCONVECTIVE PRECIPITATION
NET SHORT WAVE FLUX AT GROUND SURFACE
NET DOWNWARD LONG WAVE FLUX AT GROUND SURFACE
UPWARD HEAT FLUX AT THE SURFACE
UPWARD MOISTURE FLUX AT THE SURFACE
LATENT HEAT FLUX AT THE SURFACE
Wind Speed at 10 M
Publications in 2006-2007: 17 first-authored and second-authored papers
Chen, W., and T. Li, 2007: Modulation of northern hemisphere wintertime stationary planetary wave activity – East Asia climate relationships by the quasi-biennial oscillation. JGR-Atmosphere, 112, D20120, doi:10.1029/2007JD008611.
Zhang, X, T. Li, F. Weng, C.-C. Wu, and L. Xu, 2007: Reanalysis of western Pacific typhoons in 2004 with multi-satellite observations, Meteor. Atmosp. Phys., Vol. 97, 3-18.
Sui C.-H., P.-H. Chung, and T. Li, 2007: Interannual and interdecadal variability of the summertime western north Pacific subtropical high. GRL.
Fu, B., T. Li, M. Peng, and F. Weng, 2007: Analysis of tropical cyclone genesis in the western North Pacific for 2000 and 2001. Weather Forecasting, in press.
Chen, J.-M., T. Li, and J. Shih, 2007: Fall persistence barrier of sea surface temperature in the South China Sea associated with ENSO. J. Climate, 158-172.
Kug, J.-S., T. Li, S.-I. An, I.-S. Kang, J.-J. Luo, S. Masson, and T. Yamagata, 2006: Role of the ENSO-Indian Ocean Coupling on ENSO variability in a coupled GCM. GRL, Vol. 33, L09710, doi:10.1029/2005GL024916.
Li, T., P. Liu, X. Fu, B. Wang, and G. A. Meehl, 2006: Tempo-Spatial Structures and Mechanisms of the Tropospheric Biennial Oscillation in the Indo-Pacific Warm Ocean Regions. J. Climate, Vol. 19, No. 13, pages 3070–3087.
Peng, M., S., B. Fu, T. F. Hogan, and T. Li, 2006: On Africa easterly waves that impacted two tropical cyclones in 2004. GRL, VOL. 33, L11807, doi:10.1029/2006GL026038.
Oversea Activities and International Collaborations:
Outstanding Oversea Young Scientist Award, 2006, 400,000 RMB for collaborative research with IAP/Chinese Academy of Sciences
Expertise advisor: Chinese Academy of Meteorological Sciences/CMA (supervise 4-5 PhD-level researchers
MOU, Institute of Tropical and Marine Meteorology, Guangzhou, China (supervise the monsoon research group, currently one visitor at UH)
MOU, National Taiwan University - a joint NTU-UH workshop was held on 5-7 November, 6 faculty from SOEST/UH attended, with all travel cost covered by NTU, promote students/faculty exchange
MOU, National Central University (supervising PhD students, student exchange).
2007 Visitors with self support:LOEAN, France (Eric )NCU, Taiwan (Chung)NTU, Taiwan (Hong)ITMM, China (Gu)NUIST, China (Zhu)
