Derived Over-Ocean Water Vapor Transport from Retrieved E-P Data Sets

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Presentation transcript:

Derived Over-Ocean Water Vapor Transport from Retrieved E-P Data Sets B.J. Sohn School of Earth and Environmental Sciences Seoul National University, Seoul, Korea E-mail: sohn@snu.ac.kr

How are we going to use satellite-derived water budget quantities to validate hydrological cycles revealed in model reanalysis products, in combination with GAME data sets? Comparison of monthly, vertically integrated water and energy balance components between global 'standard' data sets and CSE data sets (GEWEX WEBS Initiative 1, John Roads)

Water Budget Studies from Reanalysis Data ECMWF NCEP Model analysis approach further needs improvement to reduce the uncertainties in our knowledge of the global hydrological cycle (e.g., atmospheric transport from reanalysis data are short of resolving the water balance inferred from stream flow data over the river basins in United States, Roads et al., 2002).

divQ = [E-P] , Q = Qd + Qn divQ = [E-P] = 2F [Qd] = -F (Prof. T.-C. Chen)

Seven Year (1988-94) JFM Mean Climatology [SSM/I]

RAOB-derived divQ vs. SSM/I E-P over NSEA and SESA (daily average) Validation against RAOB-Derived Flux Div. RAOB-derived divQ vs. SSM/I E-P over NSEA and SESA (daily average)

Water Vapor Flux (kg/sec/m) Seven Year (1988-94) JFM Mean N-S Transport [Ocean] Latitude 90N 60N 30N EQ 30S 60S 90S Water Vapor Flux (kg/sec/m) -80 -60 -40 -20 20 40 ECMWF (P) + HOAPS (E) ECMWF (P) + SSM/I (E) ECMWF (P) + COADS (E) ECMWF (P) + NCEP (E) ECMWF (P) + ECMWF (E) NCEP (P) + HOAPS (E) NCEP (P) + SSM/I (E) NCEP (P) + COADS (E) NCEP (P) + NCEP (E) NCEP (P) + ECMWF (E) SSM/I (P) + HOAPS (E) SSM/I (P) + SSM/I (E) SSM/I (P) + COADS (E) SSM/I (P) + NCEP (E) SSM/I (P) + ECMWF (E) GPCP (P) + HOAPS (E) GPCP (P) + SSM/I (E) GPCP (P) + COADS (E) GPCP (P) + NCEP (E) GPCP (P) + ECMWF (E)

Seven Year (1988-94) JFM Mean E-W Transport [10N-10S] Longitude 60E 80E 100E 120E 140E 160E 180 160W 140W 120W 100W 80W Water Vapor Flux (kg/sec/m) -80 -60 -40 -20 20 40 60 ECMWF (P) + HOAPS (E) ECMWF (P) + SSM/I (E) ECMWF (P) + COADS (E) ECMWF (P) + NCEP (E) ECMWF (P) + ECMWF (E) NCEP (P) + HOAPS (E) NCEP (P) + SSM/I (E) NCEP (P) + COADS (E) NCEP (P) + NCEP (E) NCEP (P) + ECMWF (E) SSM/I (P) + HOAPS (E) SSM/I (P) + SSM/I (E) SSM/I (P) + COADS (E) SSM/I (P) + NCEP (E) SSM/I (P) + ECMWF (E) GPCP (P) + HOAPS (E) GPCP (P) + SSM/I (E) GPCP (P) + COADS (E) GPCP (P) + NCEP (E) GPCP (P) + ECMWF (E) Seven Year (1988-94) JFM Mean E-W Transport [10N-10S]

13 Year Mean Moisture Transport (kg/sec/m) DJF JJA Annual 52 27 7 24 21 26 22 19 1 22 14 2.3 mm/day Divergence 4.2 mm/day Convergence 1.2 mm/day Convergence

Time-Series of Hydrological Variables ( Jan 1988 – Dec 2000)