TY - JOUR
T1 - Reanalysis of L-band brightness predicted by the LSP/R model for prairie grassland
T2 - Incorporation of rough surface scattering
AU - Liou, Y. A.
AU - Chen, K. S.
AU - Wu, T. D.
N1 - Funding Information:
Manuscript received May 11, 1999; revised November 29, 2000. This work was supported by the National Science Council Grant NSC89-2111-M-008-025-AP3. Y.-A. Liou and K.-S. Chen are with the Center for Space and Remote Sensing Research and the Institute of Space Science National Central University, Chung-Li, Taiwan 320 (e-mail: [email protected]). T.-D. Wu is with the Precision Instrument Development Center National Science Council, Hsinchu, Taiwan 300. Publisher Item Identifier S 0196-2892(01)00479-X.
PY - 2001/1
Y1 - 2001/1
N2 - L-band brightness predicted by the land surface process/radiobrightness (LSP/R) model for prairie grassland appears to be somewhat lower than expected. A crucial reason for the underestimate of the L-band brightness is that the soil surface was treated as smooth. In this paper, surface scattering of the soil determined by the IEM model is incorporated into the LSP/R model to examine its impact on the predicted L-band brightness. Eight sets of surface parameters, two correlation lengths (L) of 3 and 6 cm×4 root mean squared (RMS) heights (σ) of 0.3, 0.6, 0.8, and 1.0 cm, are utilized to characterize the emission of the soil surface. It is found that H-polarized, L-band brightness is expectedly increased by different levels for all of the eight rough surface cases compared to the smooth surface case. The increase in the average of the H-polarized, L-band brightness is by as much as 13.2 K for the case with L = 3 cm and σ = 1.0 cm. In addition, L-band's sensitivity to soil moisture is found to be approximately equal with and without the scattering effects. An increase in H-polarized, L-band brightness by about 12 K at the end of a 14-day simulation by the LSP/R model is in response to a decrease in soil moisture by 7% for all of the nine cases of concern (eight rough plus one smooth soil surfaces).
AB - L-band brightness predicted by the land surface process/radiobrightness (LSP/R) model for prairie grassland appears to be somewhat lower than expected. A crucial reason for the underestimate of the L-band brightness is that the soil surface was treated as smooth. In this paper, surface scattering of the soil determined by the IEM model is incorporated into the LSP/R model to examine its impact on the predicted L-band brightness. Eight sets of surface parameters, two correlation lengths (L) of 3 and 6 cm×4 root mean squared (RMS) heights (σ) of 0.3, 0.6, 0.8, and 1.0 cm, are utilized to characterize the emission of the soil surface. It is found that H-polarized, L-band brightness is expectedly increased by different levels for all of the eight rough surface cases compared to the smooth surface case. The increase in the average of the H-polarized, L-band brightness is by as much as 13.2 K for the case with L = 3 cm and σ = 1.0 cm. In addition, L-band's sensitivity to soil moisture is found to be approximately equal with and without the scattering effects. An increase in H-polarized, L-band brightness by about 12 K at the end of a 14-day simulation by the LSP/R model is in response to a decrease in soil moisture by 7% for all of the nine cases of concern (eight rough plus one smooth soil surfaces).
UR - http://www.scopus.com/inward/record.url?scp=0035114867&partnerID=8YFLogxK
U2 - 10.1109/36.898674
DO - 10.1109/36.898674
M3 - 期刊論文
AN - SCOPUS:0035114867
SN - 0196-2892
VL - 39
SP - 129
EP - 135
JO - IEEE Transactions on Geoscience and Remote Sensing
JF - IEEE Transactions on Geoscience and Remote Sensing
IS - 1
ER -