A simple instrument and technique for measuring columnar water vapor via near-IR differential solar transmission measurements

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

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

A simple two-channel solar radiometer and data retrieval technique is described 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

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Steam
Water vapor
water vapor
transmittance
Absorption spectra
data retrieval
absorption spectra
Radiometers
radiometers
radiometer
retrieval
measuring
plots

ASJC Scopus subject areas

  • Computers in Earth Sciences
  • Geochemistry and Petrology
  • Geophysics
  • Electrical and Electronic Engineering

Cite this

A simple instrument and technique for measuring columnar water vapor via near-IR differential solar transmission measurements. / Reagan, John A; Thome, K. J.; Herman, B. M.

In: IEEE Transactions on Geoscience and Remote Sensing, Vol. 30, No. 4, 07.1992, p. 825-831.

Research output: Contribution to journalArticle

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