Measuring Total Column Water Vapor

Mims, F.M., L. Chambers, and D.R. Brooks (2011), Measuring Total Column Water Vapor, Bull. Am. Meteorol. Soc., 92, 1311-1320, doi:10.1175/2011BAMS3215.1.
Abstract

A $20 infrared thermometer pointed at the cloud-free zenith sky can measure precipitable water vapor about as well as a sun photometer, and it can do so during the day or night.

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