Retrieving liquid water path and precipitable water vapor from the atmospheric radiation measurement (ARM) microwave radiometers

David D. Turner, Sliepard A. Clough, James C. Liljegren, Eugene E. Clothiaux, Karen E. Cady-Pereira, Krista L. Gaustad

Research output: Contribution to journalArticle

198 Citations (Scopus)

Abstract

Ground-based two-channel microwave radiometers (MWRs) have been used for over 15 years by the Atmospheric Radiation Measurement (ARM) program to provide observations of downwelling emitted radiance from which precipitable water vapor (PWV) and liquid water path (LWP)-two geophysical parameters critical for many areas of atmospheric research-are retrieved. An algorithm that incorporates output from two advanced retrieval techniques, namely, a physical-iterative approach and a computationally efficient statistical method, has been developed to retrieve these parameters. The forward model used in both methods is the monochromatic radiative transfer model MonoRTM. An important component of this MWR RETrieval (MWRRET) algorithm is the determination of small (< 1 K) offsets that are subtracted from the observed brightness temperatures before the retrievals are performed. Accounting for these offsets removes systematic biases from the observations and/or the model spectroscopy necessary for the retrieval, significantly reducing the systematic biases in the retrieved LWP. The MWRRET algorithm significantly provides more accurate retrievals than the original ARM statistical retrieval, which uses monthly retrieval coefficients. By combining the two retrieval methods with the application of brightness temperature offsets to reduce the spurious LWP bias in clear skies, the MWRRET algorithm significantly provides better retrievals of PWV and LWP from the ARM two-channel MWRs compared to the original ARM product.

Original languageEnglish (US)
Pages (from-to)3680-3689
Number of pages10
JournalIEEE Transactions on Geoscience and Remote Sensing
Volume45
Issue number11
DOIs
StatePublished - Nov 1 2007

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Atmospheric radiation
Microwave measurement
precipitable water
microwave radiometer
Radiometers
Water vapor
water vapor
liquid
Microwaves
Liquids
brightness temperature
Water
Luminance
water
Radiative transfer
downwelling
clear sky
radiance
radiative transfer
Statistical methods

All Science Journal Classification (ASJC) codes

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

Cite this

Turner, David D. ; Clough, Sliepard A. ; Liljegren, James C. ; Clothiaux, Eugene E. ; Cady-Pereira, Karen E. ; Gaustad, Krista L. / Retrieving liquid water path and precipitable water vapor from the atmospheric radiation measurement (ARM) microwave radiometers. In: IEEE Transactions on Geoscience and Remote Sensing. 2007 ; Vol. 45, No. 11. pp. 3680-3689.
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Retrieving liquid water path and precipitable water vapor from the atmospheric radiation measurement (ARM) microwave radiometers. / Turner, David D.; Clough, Sliepard A.; Liljegren, James C.; Clothiaux, Eugene E.; Cady-Pereira, Karen E.; Gaustad, Krista L.

In: IEEE Transactions on Geoscience and Remote Sensing, Vol. 45, No. 11, 01.11.2007, p. 3680-3689.

Research output: Contribution to journalArticle

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