A new approach to retrieving cirrus cloud height with a combination of MODIS 1.24- and 1.38-μm channels
نویسندگان
چکیده
[1] An approach is developed for inferring cloud top height (CTH) by using two shortwave infrared (SWIR) channels (i.e., 1.24and 1.38-mm) with similar cloud scattering and absorption properties but very different water vapor absorption properties. This channel combination is used to accurately infer the column water vapor amount above the clouds, from which the CTH can be retrieved. The approach performs best for ice clouds located in the upper troposphere. For those clouds, our approach performs as well or better than the current operational cloud height retrieval algorithm adopted by the MODIS science team. Citation: Wang, C., S. Ding, P. Yang, B. Baum, andA. E. Dessler (2012), A new approach to retrieving cirrus cloud height with a combination of MODIS 1.24and 1.38-mm channels, Geophys. Res. Lett., 39, L24806, doi:10.1029/2012GL053854.
منابع مشابه
Retrieval of aerosol optical depth under thin cirrus from MODIS: Application to an ocean algorithm
[1] A strategy for retrieving aerosol optical depth (AOD) under conditions of thin cirrus coverage from the Moderate Resolution Imaging Spectroradiometer (MODIS) is presented. We adopt an empirical method that derives the cirrus contribution to measured reflectance in seven bands from the visible to shortwave infrared (0.47, 0.55, 0.65, 0.86, 1.24, 1.63, and 2.12 μm, commonly used for AOD retri...
متن کاملA New Method for Detection of Cirrus Overlapping Water Clouds and Determination of Their Optical Properties
The frequent occurrence of high cirrus overlapping low water cloud poses a major challenge in retrieving their optical properties from spaceborne sensors. This paper presents a novel retrieval method that takes full advantage of the satellite data from the Moderate Resolution Imaging Spectroradiometer (MODIS). The main objectives are identification of overlapped high cirrus and low water clouds...
متن کاملAn algorithm using visible and 1.38-μm channels to retrieve cirrus cloud reflectances from aircraft and satellite data
The Moderate Resolution Imaging SpectroRadiometer (MODIS) on the Terra Spacecraft has a channel near 1.38 m for remote sensing of high clouds from space. The implementation of this channel on MODIS was primarily based on previous analysis of hyperspectral imaging data collected with the Airborne Visible Infrared Imaging Spectrometer (AVIRIS). In this paper, we describe an algorithm to retrieve ...
متن کاملDistinguishing tropospheric aerosols from thin cirrus clouds for improved aerosol retrievals using the ratio of 1.38-Mm and 1.24-Mm channels
[1] The scattering of solar radiation by cirrus clouds often contaminates aerosol products retrieved from satellite-based measurements using channels located in the visible and near-IR spectral region. Previously, it was demonstrated that a narrow satellite channel located near 1.38 mm is very effective in detecting the high level thin cirrus clouds. In this paper, we describe a ratio technique...
متن کاملDetecting Cirrus-Overlapping-Water Clouds and Retrieving their Optical Properties Using MODIS Data
Different methods have been proposed to detect multilayer clouds using passive remote sensing data. Baum et al. (1995) used the CO2-slicing technique applied to the High Resolution Infrared Radiation Sounder (HIRS) data to determine cirrus cloud heights. The spatial coherence technique (Coakley and Bretherton 1982) was applied to the advanced very high resolution radiometer (AVHRR) data to dete...
متن کامل