TY - JOUR
T1 - Inference of surface and air temperature, atmospheric precipitable water and vapor pressure deficit using advanced very high-resolution radiometer satellite observations
T2 - Comparison with field observations
AU - Prince, S. D.
AU - Goetz, S. J.
AU - Dubayah, R. O.
AU - Czajkowski, K. P.
AU - Thawley, M.
N1 - Funding Information:
Data for the FIFE, BOREAS and Hapex-Sahel field campaigns were obtained from the respective information systems (FIS, BORIS, HSIS). Statistical advice was provided by Jeff Bissette (University of Maryland). This work was funded by NASA grants NAGW 1967 to SDP, NAGW 2928 and NAGW 4554 to ROD, and NAGW 4188 for the support of K.C.
PY - 1998/12
Y1 - 1998/12
N2 - Surface temperature (T(s)), air temperature (T(a)), atmospheric precipitable water (U), and vapor pressure deficit (D) have been derived from algorithms that use satellite observations of visible, near infrared and thermal infrared radiation in order to obtain higher spatial resolution data than is possible from meteorological station observations. The inferences of these four variables are compared with field instrument observations for sites with contrasted climates and vegetation including boreal forest (BOREAS), tropical bush savanna (HAPEX-Sahel), tall-grass prairie (FIFE) and a region with mountain, prairie and intensive agriculture (Red- and Arkansas-river catchments). The results showed that T(s) could be retrieved with RMS errors of 3.5°C for a range of 48°C; Ta with 3.9°C over a range of 36°C; U with 0.6 cm over a range of 3.6 cm; and D with 10.9 mb over a range of 58 mb. Although the results had low absolute accuracies, the field data themselves are not without error-not least because, although the inferences were for a > 1 km2 area made instantaneously, they were compared with point field values generally not measured at exactly the same times in the day. Maps of retrieved variables had good relative accuracy and possibly better absolute accuracy than the comparisons with point measurements suggest.
AB - Surface temperature (T(s)), air temperature (T(a)), atmospheric precipitable water (U), and vapor pressure deficit (D) have been derived from algorithms that use satellite observations of visible, near infrared and thermal infrared radiation in order to obtain higher spatial resolution data than is possible from meteorological station observations. The inferences of these four variables are compared with field instrument observations for sites with contrasted climates and vegetation including boreal forest (BOREAS), tropical bush savanna (HAPEX-Sahel), tall-grass prairie (FIFE) and a region with mountain, prairie and intensive agriculture (Red- and Arkansas-river catchments). The results showed that T(s) could be retrieved with RMS errors of 3.5°C for a range of 48°C; Ta with 3.9°C over a range of 36°C; U with 0.6 cm over a range of 3.6 cm; and D with 10.9 mb over a range of 58 mb. Although the results had low absolute accuracies, the field data themselves are not without error-not least because, although the inferences were for a > 1 km2 area made instantaneously, they were compared with point field values generally not measured at exactly the same times in the day. Maps of retrieved variables had good relative accuracy and possibly better absolute accuracy than the comparisons with point measurements suggest.
KW - Air temperature
KW - AVHRR satellite
KW - Land surface climatology
KW - Precipitable water
KW - Surface temperature
KW - Vapor pressure deficit
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U2 - 10.1016/S0022-1694(98)00210-8
DO - 10.1016/S0022-1694(98)00210-8
M3 - Article
AN - SCOPUS:0032419838
SN - 0022-1694
VL - 212-213
SP - 230
EP - 249
JO - Journal of Hydrology
JF - Journal of Hydrology
IS - 1-4
ER -