The second Global Soil Wetness Project (GSWP2) is an ongoing scientific activity that aims at primary producing state-of-the-art global datasets of land surface fluxes, state variables and related hydrologic quantities by integrating uncoupled land surface schemes. As of 31st July 2004, 12 institutes have submitted their baseline simulation (Bucket, CLM2-TOP, ISBA, LaD, MOSES2, NOAH, NSIPP-CATCH, ORCHIDEE, SSiB, SiBUC, SWAP and VISA). In this report, preliminary result of their intercomparison is shown using global, 10-year average fluxes and state variables components.
Prior to the analysis, the outputs are closely examined whether energy and water is balanced. First, energy components are well balanced for all models. Water components, however, are not fully balanced for several models. It may be caused by recharge of soil moisture from below the bottom soil layer since most of them increases water amount in their system.
The energy and water balance is shown in Table 1 and Table 2. Even using global, 10-year average, energy and water partitioning has large discrepancy between models. Bowen Ratio (= Sensible Heat / Latent Heat) ranges from 0.473 (SWAP) to 2.767 (NOAH), the average of 12 schemes is 0.948. Runoff Ratio (= Total Runoff / Total Precipitation) ranges from 0.32 (SWAP, NSIPP-CATCH) to 0.70 (NOAH). Table 1 Global energy balance components (unit: W/m3, global, 10-year average)
|
SWnet |
Lwnet |
lE |
H |
G |
Qfusion |
Qsublim |
Qrain |
Balance |
BUCK |
144.7 |
-77.2 |
41.0 |
24.2 |
1.4 |
1.3 |
-0.4 |
0.0 |
-0.1 |
CLM2 |
128.8 |
-66.1 |
35.9 |
26.4 |
0.3 |
1.1 |
0.2 |
0.0 |
-1.3 |
ISBA |
142.8 |
-57.6 |
37.4 |
45.6 |
0.2 |
0.0 |
1.1 |
0.0 |
1.0 |
LaD_ |
141.0 |
-64.9 |
42.0 |
31.5 |
0.0 |
1.2 |
1.3 |
0.0 |
-0.1 |
MOSE |
142.4 |
-68.2 |
37.5 |
35.5 |
0.0 |
1.2 |
0.0 |
0.0 |
0.0 |
NOAH |
143.0 |
-66.7 |
19.0 |
52.6 |
-0.3 |
4.8 |
-3.2 |
0.0 |
3.4 |
NSIP |
143.3 |
-60.4 |
44.1 |
39.6 |
-0.2 |
1.4 |
-0.6 |
-1.2 |
-0.2 |
ORCH |
133.5 |
-64.3 |
30.3 |
37.6 |
0.1 |
0.9 |
-1.3 |
0.0 |
1.5 |
SSiB |
143.7 |
-63.4 |
31.7 |
47.4 |
1.3 |
0.9 |
0.1 |
0.0 |
-1.0 |
SWAP |
141.5 |
-74.4 |
45.5 |
21.5 |
0.0 |
0.8 |
-0.7 |
0.0 |
0.0 |
SiBU |
139.5 |
-67.1 |
36.4 |
25.2 |
8.6 |
0.8 |
0.0 |
0.0 |
1.4 |
VISA |
151.2 |
-69.9 |
44.0 |
34.2 |
2.1 |
0.9 |
0.1 |
0.0 |
0.0 |
Mean |
141.3 |
-66.7 |
37.1 |
35.1 |
1.1 |
1.3 |
-0.3 |
-0.1 |
0.4 |
|
Rainf |
Snowf |
Evap |
Qs |
Qsb |
Balance |
BUCK |
97774 |
14654 |
70865 |
43610 |
0 |
-2047 |
CLM2 |
93766 |
8688 |
62165 |
3842 |
36588 |
-142 |
ISBA |
99921 |
13902 |
66344 |
15060 |
32561 |
-142 |
LaD_ |
99722 |
13909 |
74729 |
0 |
38716 |
186 |
MOSE |
99923 |
13902 |
65066 |
16306 |
32376 |
76 |
NOAH |
97774 |
14654 |
31847 |
2590 |
75840 |
2152 |
NSIP |
96730 |
13244 |
74352 |
20152 |
15339 |
131 |
ORCH |
96865 |
13514 |
51031 |
3746 |
71168 |
-15566 |
SSiB |
105979 |
7967 |
55700 |
37446 |
20926 |
-126 |
SWAP |
104603 |
9220 |
77158 |
10938 |
25654 |
73 |
SiBU |
102621 |
11182 |
65540 |
27761 |
25648 |
-5146 |
VISA |
99921 |
13902 |
76116 |
12380 |
30110 |
-4782 |
Mean |
99633 |
12395 |
64243 |
16153 |
33744 |
-2111 |
In the annual meeting, both regionally and temporally detailed analyses and their background mechanism will be presented.
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