Estimating Eliassen-Palm flux using COSMIC radio occultation

Details Estimating Eliassen-Palm flux using COSMIC radio occultation Estimating Eliassen-Palm flux using COSMIC radio occultation

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3410810l&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 10, CiteID L10810

Statistics

Methodology

Atmospheric Composition And Structure: Middle Atmosphere: Constituent Transport And Chemistry (3334), Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Processes: Remote Sensing, Atmospheric Processes: Tides And Planetary Waves

Scientific paper

We present a methodology for analyzing the Eliassen-Palm (E-P) flux in the troposphere and stratosphere using GPS radio occultation data from the COSMIC project. In this methodology, geopotential height and temperature are mapped on constant pressure surfaces using a Bayesian interpolation scheme with a spherical harmonic basis, and the components of the E-P flux are evaluated using geostrophic winds. We perform a simulation-analysis study using the NCEP/NCAR Reanalysis as truth. E-P fluxes are evaluated daily, and it is found that patterns of E-P flux are estimated faithfully, and extrema in the vertical and horizontal components are underestimated by 5-10% and by 30-40%, respectively. Monthly hemispheric averages of the vertical component of the E-P flux at the tropopause can be estimated to <5%. The error is due to the geostrophic approximation and spatial coverage, mostly the latter: COSMIC GPS radio occultation only resolves atmospheric eddies with scales greater than 1000 km on a daily basis.

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