TY - GEN
T1 - Global microwave land surface emissivity retrieval at the Amsr-E microwave frequencies
AU - Norouzi, Hamidreza
AU - Temimi, Marouane
AU - Khanbilvardi, Reza
PY - 2010
Y1 - 2010
N2 - Land emissivity is a key boundary condition particularly when used in Numerical Weather Prediction (NWP) models. The objective of this study is to develop a global land emissivity product using AMSR-E passive microwave data. This work investigates the impact of the difference in penetration depths between passive microwave and thermal temperatures on the retrieval of land emissivity. AMSR-E frequencies (6.9, 10.7, 18.7, and 36.5 GHz) have been used to retrieve land emissivity. Composite clear sky skin temperature (DX) produced by the International Satellite Cloud Climatology Project (ISCCP) was used. Moreover, information on water vapor and air temperature obtained from the ISCCP database (TOVS data) was used to calculate the upwelling and the downwelling atmospheric brightness temperatures as well as the atmospheric transmission. Instantaneous land emissivity maps have been developed at different AMSR-E frequencies. A monthly composited map was developed for each frequency. The analysis of the obtained maps has shown an acceptable agreement with the global pattern of land use/land cover. Also, a significant difference between ascending and descending overpasses emissivity was found in deserts and high topographyregions.
AB - Land emissivity is a key boundary condition particularly when used in Numerical Weather Prediction (NWP) models. The objective of this study is to develop a global land emissivity product using AMSR-E passive microwave data. This work investigates the impact of the difference in penetration depths between passive microwave and thermal temperatures on the retrieval of land emissivity. AMSR-E frequencies (6.9, 10.7, 18.7, and 36.5 GHz) have been used to retrieve land emissivity. Composite clear sky skin temperature (DX) produced by the International Satellite Cloud Climatology Project (ISCCP) was used. Moreover, information on water vapor and air temperature obtained from the ISCCP database (TOVS data) was used to calculate the upwelling and the downwelling atmospheric brightness temperatures as well as the atmospheric transmission. Instantaneous land emissivity maps have been developed at different AMSR-E frequencies. A monthly composited map was developed for each frequency. The analysis of the obtained maps has shown an acceptable agreement with the global pattern of land use/land cover. Also, a significant difference between ascending and descending overpasses emissivity was found in deserts and high topographyregions.
KW - Brightness temperature
KW - Diurnal cycle
KW - Land surface emissivity
KW - Microwave
UR - http://www.scopus.com/inward/record.url?scp=77958106676&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77958106676&partnerID=8YFLogxK
U2 - 10.1109/MICRORAD.2010.5559582
DO - 10.1109/MICRORAD.2010.5559582
M3 - Conference contribution
AN - SCOPUS:77958106676
SN - 9781424481217
T3 - 11th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment, MicroRad 2010 - Proceedings
SP - 90
EP - 95
BT - 11th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment, MicroRad 2010 - Proceedings
T2 - 11th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment, MicroRad 2010
Y2 - 1 March 2010 through 4 March 2010
ER -