Evaluation of model-simulated upper troposphere humidity using 6.7 μm satellite observations

Douglas A. Spangenberg, Gerald G. Mace, Thomas P. Ackerman, Nelson L. Seaman, Brian J Soden

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Use of mesoscale models to simulate details of upper tropospheric relative humidity (UTRH) fields represents an important step toward understanding the evolution of small-scale water vapor structures that are responsible for cirrus growth and dissipation. Because mesoscale model UTRH simulations require initialization and verification and since radiosonde measurements of relative humidity are unreliable in the upper troposphere, we use GOES 6.7 μm water vapor observations to validate the Pennsylvania State University/National Center for Atmospheric Research nonhydrostatic mesoscale model (MM5) simulations of UTRH. To accomplish this task, MM5 temperature and moisture profiles are used in a forward calculation of the clear-sky 6.7 μm brightness temperature (T6.7), which is converted into UTRH. A statistical analysis is done to evaluate MM5 simulations of T6.7 and UTRH against the GOES 7 observations. For the simulations, an average correlation coefficient of 0.80 was found with a dry bias of 1.6 K. In terms of UTRH, the average correlation coefficient was 0.65 with a dry bias of 3.3%. We also found that MM5 fails to simulate accurately extrema in the UTRH field.

Original languageEnglish (US)
JournalJournal of Geophysical Research C: Oceans
Volume102
Issue number22
StatePublished - Nov 27 1997
Externally publishedYes

Fingerprint

Troposphere
satellite observation
troposphere
humidity
relative humidity
Atmospheric humidity
Satellites
evaluation
Steam
GOES
correlation coefficients
simulation
water vapor
GOES 7
Radiosondes
radiosondes
observation satellite
brightness temperature
cirrus
range (extremes)

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Atmospheric Science
  • Astronomy and Astrophysics
  • Oceanography

Cite this

Evaluation of model-simulated upper troposphere humidity using 6.7 μm satellite observations. / Spangenberg, Douglas A.; Mace, Gerald G.; Ackerman, Thomas P.; Seaman, Nelson L.; Soden, Brian J.

In: Journal of Geophysical Research C: Oceans, Vol. 102, No. 22, 27.11.1997.

Research output: Contribution to journalArticle

Spangenberg, Douglas A. ; Mace, Gerald G. ; Ackerman, Thomas P. ; Seaman, Nelson L. ; Soden, Brian J. / Evaluation of model-simulated upper troposphere humidity using 6.7 μm satellite observations. In: Journal of Geophysical Research C: Oceans. 1997 ; Vol. 102, No. 22.
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