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Last updated
30/06/2007
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Microwave Land Emissivity Calculation
The method
Sensors and frequencies
The land emissivities have been calculated using:
- Observations from AMSU-A and AMSU-B window channels:
- 23.8, 31.4, 50.3, 89 GHz for AMSU-A
- 89 and 150 GHz for AMSU-B
- All scan positions (this corresponds to +/- 58° of zenith angle change)
- The polarization varies with the zenith angle
- Observations from SSM/I channels:
- 19V, 19H, 22H, 37V, 37H, 85V, 85H
- For this sensor the zenith angle is close to 53° and the polarization is V (for Vertical) or H (for Horizontal)
- Observations from SSMI/S window channels:
- This work has been done at ECMWF and partly funded by the NWPSAF
- 19.35V, 19.35H, 22.2V, 37V, 37H, 91.6V, 91.6H, 150H GHz
- For this sensor the zenith angle is close to 53° and the polarization is V (for Vertical) or H (for Horizontal)
- Observations from TMI channels:
- This work has been done at ECMWF and partly funded by the NWPSAF
- 10.65 (V&H), 19.35 (V&H), 21.3 V, 37 (V&H), 85.5 (V&H) GHz
- For this sensor the zenith angle is close to 53° and the polarization is V (for Vertical) or H (for Horizontal)
- Observations from AMSR-E channels:
- This work has been done at ECMWF and partly funded by the NWPSAF
- 6.9 (V&H),10.64 (V&H), 18.7 (V&H), 23.8 (V&H), 36.5 (V&H), 89 (V&H) GHz
- For this sensor the zenith angle is close to 53° and the polarization is V (for Vertical) or H (for Horizontal)
References
- Jones, A. S., and T. H. Vonder Haar, 1997, Retrieval of microwave
surface emittance over land using coincident microwave and infrared
satellite measurements, J. Geophys. Res., vol. 102, NO. D12, pp
13,609-13,626, Jun 1997.
- Karbou, F., C. Prigent, L. Eymard and J. Pardo, 2005, Microwave
land emissivity calculations using AMSU-A and AMSU-B measurements. IEEE
Trans. on Geoscience and Remote Sensing, 43, 5, 948-959
- Karbou, F. and C. Prigent,2005,Calculation of microwave land
surface emissivities from satellite observations: validity of the
specular approximation over snow-free surfaces ? . IEEE Trans. Geosci. Remote Sensing Letters, 2, 3, 311-314
- Matzler, C.,2005, On the determination of surface emissivity from
satellite observations, IEEE Geoscience and remote sensing letters,.
IEEE Geosci. remote sensing letters,2, 2, 160-163
- Prigent, C., W. B. Rossow, and E. Matthews, 1997, Microwave land
surface emissivities estimated from SSM/I observations, J. Geophys.
Res., 102, 21867-21890
- Weng, F., B. Yan and N. Grody, 2001, A microwave land emissivity model, J. Geophys. Res., vol. 106, NO. D17, pp 20,115-20,123
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