Applications of spaceborne radar laboratory data to the study of aeolian processes

被引:55
作者
Greeley, R
Blumberg, DG
McHone, JF
Dobrovolskis, A
Iversen, JD
Lancaster, N
Rasmussen, KR
Wall, SD
White, BR
机构
[1] ARIZONA STATE UNIV, DEPT GEOL, TEMPE, AZ 85287 USA
[2] NASA, AMES RES CTR, MOFFETT FIELD, CA 94035 USA
[3] IOWA STATE UNIV, DEPT AEROSP ENGN, AMES, IA 50011 USA
[4] UNIV NEVADA, DESERT RES INST, QUATERNARY SCI CTR, RENO, NV 89506 USA
[5] AARHUS UNIV, INST GEOL, DK-8000 AARHUS C, DENMARK
[6] CALTECH, JET PROP LAB, PASADENA, CA 91109 USA
[7] UNIV CALIF DAVIS, DEPT MECH & AERONAUT ENGN, DAVIS, CA 95616 USA
关键词
D O I
10.1029/97JE00518
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Aerodynamic roughness (z(0)) is an important parameter in studies of sand and dust transport, as well as atmospheric circulation models. Aerodynamic roughness is a function of the size and spacing of surface roughness elements and is typically determined at point locations in the field from wind velocity profiles. Because field measurements require complex logistics, z(0) values have been obtained for very few localities. If radar can be used to map z(0), estimates can be obtained for large areas. In addition, because aerodynamic roughness can change in response to surface processes (e.g., flooding of alluvial surfaces), radar remote sensing could obtain new measurements on short timescales. Both z(0) and the radar backscatter coefficient sigma(0) are dependent on topographic roughness at the submeter scale, and correlation between these two parameters was developed based on radar data obtained from aircraft (AIRSAR). The Spaceborne Radar Laboratory (SRL) afforded the opportunity to test the correlation for data obtained from orbit. SRL data for sites in Death Valley, California; Lunar Lake, Nevada; and Gobabeb, Namibia, were correlated with wind data and compared with previous radar z(0) relations. Correlations between sigma(0) and z(0) for L band (lambda = 24 cm) HV (H, vertically and V, vertically polarized modes) L band HH, and C band (lambda = 5.6 cm) HV compare favorably with previous studies. Based on these results, maps of z(0), values were derived from SRL data for each site, demonstrating the potential to map z(0) for large vegetation-free areas from orbit using radar systems.
引用
收藏
页码:10971 / 10983
页数:13
相关论文
共 47 条
[1]  
[Anonymous], 1982, RADAR REMOTE SENSING
[2]  
Arya S. P, 1982, ENG METEOROLOGY, P233
[3]  
BAGNOLD RA, 1941, PHYSICS BLOWN SAND D
[4]   FIELD STUDIES OF AERODYNAMIC ROUGHNESS LENGTH [J].
BLUMBERG, DG ;
GREELEY, R .
JOURNAL OF ARID ENVIRONMENTS, 1993, 25 (01) :39-48
[5]  
BLUMBERG DG, 1993, THESIS ARIZ STATE U
[6]   MEASURING SOIL-MOISTURE WITH IMAGING RADARS [J].
DUBOIS, PC ;
VANZYL, J ;
ENGMAN, T .
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 1995, 33 (04) :915-926
[7]  
Elachi C, 1988, SPACEBORNE RADAR REM
[8]  
EVANS DL, 1993, EOS T AGU, V74, P145
[9]  
EVANS DL, 1993, EOS, V74, P157
[10]   SIR-C DATA QUALITY AND CALIBRATION RESULTS [J].
FREEMAN, A ;
ALVES, M ;
CHAPMAN, B ;
CRUZ, J ;
KIM, Y ;
SHAFFER, S ;
SUN, J ;
TURNER, E ;
SARABANDI, K .
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 1995, 33 (04) :848-857