A Simple Instrument and Technique for Measuring Columnar Water Vapor via Near-IR Differential Solar Transmission Measurements

J. A. Reagan, K. J. Thome, B. M. Herman

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

This paper describes a simple two-channel solar radiometer and data retrieval technique for sensing the columnar content of atmospheric water vapor via differential solar transmission measurements in and adjacent to the 940-nm water vapor absorption band. The instrument features two parallel channels for simultaneous measurements in and out of the absorption band to eliminate temporal variability effects in the differential comparison of the data from the two channels. The water vapor transmittance is determined by a modified Langley plot analysis of the ratio of the two channel signals. A statistical band model which closely follows the square-root law is then used to extract the columnar water vapor amount from the water vapor band transmittance. Error analyses and experimental results indicate that the instrument/technique can be reasonably employed to retrieve water vapor amounts with an error of 10% or less.

Original languageEnglish (US)
Pages (from-to)825-831
Number of pages7
JournalIEEE Transactions on Geoscience and Remote Sensing
Volume30
Issue number4
DOIs
StatePublished - Jul 1992

Keywords

  • Differential Transmission
  • solar radiometry
  • water vapor absorption

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Earth and Planetary Sciences(all)

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