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Passive microwave remote sensing contribution to hydrological variables

  • Part I: Observations and Observational Needs
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Abstract

Physical principles governing passive microwave remote sensing of hydrological variables are outlined and illustrated by actual observations by ground-based, air-borne and space-borne microwave radiometers operating at different frequencies. Specific hydrological variables addressed in this paper are soil moisture, seasonal inundation of rivers and swamps, vegetation, snow, and rainfall. Passive remote sensing provides measurements of electromagnetic radiation emitted by the land-atmosphere system, which can be related more directly to the radiative characteristics of the system than to physical or physiological characteristics. Estimation of hydrological variables from microwave observations necessarily involves models relating the radiative to the physical characteristics, and in general more than one physical characteristics determine the microwave observations. This non-uniqueness in the relationship between microwave observations to a particular hydrological variable leads to uncertainties in the estimation of the variable. Notwithstanding this limitation, the principles and the examples given in this paper illustrate the value of passive microwave observations to regional and global hydrology at a temporal resolution of days aggregated to a decade.

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Authors and Affiliations

  1. Hydrological Sciences Branch, NASA/Goddard Space Flight Center, 20771, Greenbelt, MD, U.S.A.

    Bhaskar J. Choudhury

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  1. Bhaskar J. Choudhury
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Choudhury, B.J. Passive microwave remote sensing contribution to hydrological variables. Surv Geophys 12, 63–84 (1991). https://doi.org/10.1007/BF01903412

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