PRIDE for Hawaii Region

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• Tim Li
• initial hire in March 1999, joint IPRC-MET
  faculty
• 1 PhD 1 MS students graduated, 4 current PhD
  students
• Major research topics
• Tropical cyclone dynamics and modeling
• Monsoon climate variability
• Tropical atmosphere-ocean interactions (ENSO,
  IOD, TBO)
• 4DVar data assimilation (satellite data
  application)

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Current research grants as a PI ONR, Toward the
development of tropical cyclone ensemble forecast
and cyclogenesis modeling and forecast for the
DODs 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.
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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
NASA Aqua Image for Hurricane Francis (2004)
945 hPa 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
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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
Typhoon intensity bias
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PRIDE for Hawaii Region
Analysis Domains

• We are using
• WRF WRFVAR
• Background
• NCEP final analysis or NCEP global forecast
• Observations
• Radiosondes TTAA, TTBB, PPBB, etc.
• Surface obs SYNOPS, METARS, AWS, ships, buoys,
  CMAN
• Profiler
• Sat winds GOES, METSAT, MODIS, AVHRR
• Satem
• Aircraft PIREPS, AIREPS, AMDAR, ACARS
• Dropsondes and "hurricane hunter" obs
• Quikscat
• Ground-based GPS PW
• COSMIC GPS refractivity

• Domain-1 250x200x41, 18 km
• Domain-2 160x120x41,6 km

Forcing for HYCOM-Sample 2007081018
Forcing for HYCOM QV 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-S
TEP 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
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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, doi10.1029/2007JD008611. 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, doi10.1029/2005GL02491
6. 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
30703087. 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, doi10.1029/2006GL026038.
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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)