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1.
The letter is devoted to the introduction of a new technique to derive the cloud bottom height (CBH) from satellite measurements of the cloud reflectance in the oxygen A-band. The information on the cloud top height needed in the retrieval of the CBH must be obtained from separate measurements to insure small biases in the retrieved CBH. Such measurements can be performed by a space-based lidar. 相似文献
2.
Derives a simple approximate equation for the depth of sunlight penetration in a cloud field. This depth is defined as the cloud optical thickness, which corresponds to the reflection function equal to 90% of the reflection function for a semi-infinite cloudy layer. 相似文献
3.
Kokhanovsky A.A. Rozanov V.V. von Hoyningen-Huene W. Bovensmann H. Burrows J.P. Baltink H.K. 《Geoscience and Remote Sensing Letters, IEEE》2004,1(3):211-214
This letter shows first results for the application of a recently developed semianalytical cloud retrieval algorithm for the determination of cloud top heights from space. The technique is based on the measurements of the top-of-atmosphere reflectance in the oxygen A-band. The depth of the band depends on the cloud top height and its geometrical thickness. The data obtained are compared to ground-based measurements of the cloud top height using a cloud-profiling radar. 相似文献
4.
Kokhanovsky A.A. Jourdan O. Burrows J.P. 《Geoscience and Remote Sensing Letters, IEEE》2006,3(1):103-106
A new technique to identify mixed-phase clouds but also clouds with supercooled water droplets using satellite measurements is proposed. The technique is based on measurements of the backscattered solar light at wavelengths 1.55 and 1.67 /spl mu/m in combination with cloud brightness temperature measurements at 12 /spl mu/m. For the first time, the concept of the phase index-temperature correlation plot (the P-T diagram) is introduced in the cloud remote sensing. Retrievals of cloud temperature and cloud phase index are performed using data from the Advanced Along Track Scanning Radiometer (AATSR) and Scaning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY) both onboard the Envisat platform. 相似文献
5.
Jourdan O. Kokhanovsky A. A. Burrows J. P. 《Geoscience and Remote Sensing Letters, IEEE》2007,4(1):8-12
This letter investigates the synergy between the Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY) and the Advanced Along Track Scanning Radiometer (AATSR) onboard the ENVISAT platform for reflectance calibration purposes. This calibration study was mainly performed over a portion of a hurricane corresponding to fully cloudy SCIAMACHY and AATSR pixels. Results show that SCIAMACHY underestimates the top-of-atmosphere (TOA) reflectance by up to 23% (at 870 nm) as compared to AATSR for a nadir viewing geometry. Specifically, considering AATSR calibration as accurate, which is confirmed by comparison with the Medium Resolution Imaging Spectrometer, the SCIAMACHY TOA reflectances should be multiplied by 1.21, 1.19, 1.23, and 1.10 for wavelengths at 550, 670, 870, and 1600 nm, respectively, ahead of satellite retrieval schemes based on the measurements of TOA reflectance 相似文献
6.
The solution of the vector radiative transfer equation using the discrete ordinates technique: Selected applications 总被引：2，自引：1，他引：1
The paper is devoted to the presentation of a newly developed radiative transfer code SCIAPOL_1.0 for a plane-parallel turbid slab illuminated by the monodirectional wide beam. The SCIAPOL_1.0 is based on the discrete-ordinates solution of the vector radiative transfer equation.The code is applied to a number of problems, including studies of the applicability of the scalar approximation for the calculation of light reflectance from aerosols, clouds, and molecular atmospheres. We also study the accuracy of the single scattering approximation as applied to the calculation of light reflection from molecular and cloudy atmospheres and propose new approximations for the calculation of the reflection function and the degree of light polarization under unpolarized light illumination conditions. 相似文献
7.
The accuracy of the retrieved NO2 vertical columns using satellite observations under cloudy conditions have been studied using the radiative transfer code SCIATRAN. It was found that the tropospheric nitrogen dioxide columns can be retrieved in the case of thin clouds, if their optical properties and the altitude are retrieved from independent observations. The dependence of the retrieval error on the accuracy of the information on cloud top height and cloud optical thickness is studied. 相似文献
8.
Kokhanovsky A.A. Schreier M. von Hoyningen-Huene W. 《Geoscience and Remote Sensing Letters, IEEE》2008,5(1):53-56
The top-of-atmosphere reflectance measurements by advanced along-track scanning radiometer (AATSR), medium-resolution imaging spectrometer (MERIS), and scanning imaging absorption spectrometer for atmospheric chartography (SCIAMACHY) onboard ENVISAT have been compared for collocated scenes. The AATSR and MERIS observations were averaged to the scale of a SCIAMACHY ground scene (30 km times 60 km). The SCIAMACHY reflectances were averaged to account for much coarser spectral resolution of AATSR and MERIS observations. It was found that SCIAMACHY reflectances coincide with those of MERIS within 4% MERIS calibration error. This is also the case for AATSR reflectances, except at the wavelength of 0.865 mum, where SCIAMACHY gives, on average, 6% lower reflectances as compared to those of AATSR. They are 3% too low as compared to MERIS observations at this wavelength. 相似文献
9.
Kokhanovsky A. A. Bramstedt K. von Hoyningen-Huene W. Burrows J. P. 《Geoscience and Remote Sensing Letters, IEEE》2007,4(2):293-296
This letter is aimed at better understanding of Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY) reflectance radiometric calibration errors using the Medium Resolution Imaging Spectrometer (MERIS) onboard ENVISAT. Earlier investigations showed that the SCIAMACHY calibration error can reach 20% in the visible bands, which prevents aerosol retrievals using the SCIAMACHY data. Recent improvements of the SCIAMACHY calibration are discussed. It is found that the differences in reflectances for the wavelengths 443, 560, 665, 754, and 865 nm between MERIS and improved Processor 6 SCIAMACHY data are close to the MERIS radiometric calibration error, which is below 4% 相似文献
10.
A method previously developed by the authors is employed to determine the cloud geometrical thickness from combined measurements of the cloud brightness temperature and the backscattered solar light intensity in the O/sub 2/ A-band. The technique is applied to the analysis of four selected orbits of the European Remote Sensing 2 satellite using measurements performed by the Global Ozone Measurement Experiment spectrometer and the Along Track Scanning Radiometer. Cloud geometrical thicknesses were found to be in the range 0.5-7.5 km with most frequent values of 3 km for the cases studied. 相似文献