Atmospheric pre-corrected differential absorption techniques to retrieve columnar water vapor: Application to AVIRIS 91/95 data

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Water vapor is one of the main forces for weather development as well as for mesoscale air transport processes. The monitoring of water vapor is therefore an important aim in remote sensing of the atmosphere. Current operational systems for water vapor detection use primarily the emission in the thermal infrared (AVHRR, GOES, ATSR, Meteosat) or in the microwave radiation bands (DMSP). The disadvantage of current satellite systems is either a coarse spatial (horizontal) resolution ranging from one to tens of kilometers or a limited insight into the lower atmosphere. Imaging spectrometry on the other hand measures total column water vapor ... continued below

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10 p.

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Schlaepfer, D.; Borel, C.C. & Keller, J. March 1, 1996.

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  • Schlaepfer, D. Univ. of Zuerich (Switzerland). Dept. of Geography
  • Borel, C.C. Los Alamos National Lab., NM (United States)
  • Keller, J. Paul Scherrer Institut, Villigen (Switzerland)

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Description

Water vapor is one of the main forces for weather development as well as for mesoscale air transport processes. The monitoring of water vapor is therefore an important aim in remote sensing of the atmosphere. Current operational systems for water vapor detection use primarily the emission in the thermal infrared (AVHRR, GOES, ATSR, Meteosat) or in the microwave radiation bands (DMSP). The disadvantage of current satellite systems is either a coarse spatial (horizontal) resolution ranging from one to tens of kilometers or a limited insight into the lower atmosphere. Imaging spectrometry on the other hand measures total column water vapor contents at a high spatial horizontal resolution and has therefore the potential of filling these gaps. The sensors of the AVIRIS instrument are capable of acquiring hyperspectral data in 224 bands located in the visible and near infrared at 10 run resolution. This data includes information on constituents of the earth`s surface as well as of the atmosphere. The optical measurement of water vapor can be performed using sensor channels located in bands or lines of the absorption spectrum. The AVIRIS sensor has been used to retrieve water vapor and with less accuracy carbon dioxide, oxygen and ozone. To retrieve the water vapor amount, the so called differential absorption technique has been applied. The goal of this technique is to eliminate background factors by taking a ratio between channels within the absorption band and others besides the band. Various rationing methods on the basis of different channels and calculation techniques were developed. The influence of a trace gas of interest on the radiance at the sensor level is usually simulated by using radiative transfer codes. In this study, spectral transmittance and radiance are calculated by MODTRAN3 simulations with the new DISORT option. This work testS the best performing differential absorption techniques for imaging spectrometry of tropospheric water vapor.

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10 p.

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OSTI as DE96007190

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  • 6. annual JPL airborne science workshop, Pasadena, CA (United States), 4-6 Mar 1996

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  • Other: DE96007190
  • Report No.: LA-UR--96-0047
  • Report No.: CONF-9603128--2
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 204207
  • Archival Resource Key: ark:/67531/metadc670441

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  • March 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • Aug. 8, 2016, 8:32 p.m.

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Schlaepfer, D.; Borel, C.C. & Keller, J. Atmospheric pre-corrected differential absorption techniques to retrieve columnar water vapor: Application to AVIRIS 91/95 data, article, March 1, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc670441/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.