BBHRP Assessment Using Ground Measurements and Satellite-based High Spectral Resolution Infrared Observations in Clear Sky Conditions

Henry Revercomb University of Wisconsin, Madison
Robert Holz University of Wisconsin/CIMMS
Robert Knuteson University of Wisconsin
Leslie Moy University of Wisconsin, Madison
David Tobin University of Wisconsin, Madison
David Turner National Oceanic and Atmospheric Administration

Category: Radiation

The overall objective of this research is to support the ARM Broadband Heating Rate Profile (BBHRP) measure-ment-model comparison effort that will couple heating rates based on ARM data more directly into single-column models and GCMs. We are making use of high spectral resolution infrared satellite and ground-based data for as-sessing the model parameterizations that are candidates for relating ARM time sequences to statistical cloud and radiation properties on the GCM grid cell scale. This is expected to contribute toward the ARM Program objec-tive of gathering data and techniques needed to provide refined parameterizations for climate models. This poster presents an extension of the clear-sky BBHRP at the Southern Great Plains (SGP) site covering multiple years. Microwave Radiometer-scaled sondes from the years 2000 through 2005, combined with surface temperatures derived from pyrgeometer measurements provide input for rapid radiative transfer model (RRTM) (Atmosphere and Environmental Research, Inc.) calculations of flux. This large dataset offers a robust statistical analysis of daily, seasonal, and long-term comparisons to assess our ability to compute and measure top-of-the-atmosphere (TOA) and surface fluxes. We also assess BBHRP at Aqua overpass times between the years 2003 and 2004 using the additional information from the Atmospheric Infrared Sounder (AIRS) satellite validation campaign. Atmospheric soundings at the SGP site are interpolated to AIRS overpass times so that clear-sky line-by-line radiative transfer model (LBLRTM)/RRTM flux calculations using derived AIRS surface temperatures and emissivities would be coincident. We are able to use the AIRS high spectral observations to constrain the atmosphere state assumptions. The temperature soundings are also appended with upper-level atmospheric profiles from the Euro-pean Centre for Medium–Range Weather Forecasts (ECMWF) model output to study their impact on TOA net flux.

This poster will be displayed at ARM Science Team Meeting.

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