Derived Over-Ocean Water Vapor Transportfrom Retrieved E-P Data Sets

B.J. Sohn

School of Earth and Environmental SciencesSeoul 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

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).

PEdiv(Q)t

(TPW)

divQ = [E-P] , Q = Qd + Qn

divQ = [E-P] = 2[Qd] = -

0

psqvdpQ

(Prof. T.-C. Chen)

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

GAME/SCSMEX AREA(May - June 1998)

95E 100E 105E 110E 115E 120E 125E

EQ

5N

10N

15N

20N

25N

NESA

SESA

Haikou

Tungkong

Shantou

Kings Park

Laoag

Xisha Island

Songkhla

Singapore Kuching

Brunei Airport

Saigon

RAOB-derived divQ vs. SSM/I E-Pover NSEA and SESA (daily average)

PEdp dl g

divQPs

0

)v(q1

Validation against RAOB-Derived Flux Div.

Latitude

90N 60N 30N EQ 30S 60S 90S

Wat

er V

apor

Flu

x (

kg/s

ec/

m)

-80

-60

-40

-20

0

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 N-S Transport [Ocean]

Longitude60E 80E 100E 120E 140E 160E 180 160W 140W 120W 100W 80W

Wat

er V

apor

Flu

x (

kg/s

ec/

m)

-80

-60

-40

-20

0

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]

DJF Annual

110E 120E 130E 140E 150E15N

20N

25N

30N

35N

40N

45N

50N

52

27

7

27

JJA

110E 120E 130E 140E 150E15N

20N

25N

30N

35N

40N

45N

50N

24

21

26

22

110E 120E 130E 140E 150E15N

20N

25N

30N

35N

40N

45N

50N

19

1

22

14

2.3 mm/dayDivergence

4.2 mm/dayConvergence

1.2 mm/dayConvergence

13 Year Mean Moisture Transport (kg/sec/m)

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