Altmetric

Characterizing energy budget variability at a Sahelian site: a test of NWP model behaviour

File Description SizeFormat 
acp-17-15095-2017.pdfPublished version6.1 MBAdobe PDFView/Open
Title: Characterizing energy budget variability at a Sahelian site: a test of NWP model behaviour
Authors: Mackie, A
Palmer, PI
Brindley, H
Item Type: Journal Article
Abstract: We use observations of surface and top-of-theatmosphere (TOA) broadband radiation fluxes determined from the Atmospheric Radiation Measurement programme mobile facility, the Geostationary Earth Radiation Budget (GERB) and Spinning Enhanced Visible and Infrared Imager (SEVIRI) instruments and a range of meteorological variables at a site in the Sahel to test the ability of the ECMWF Integrated Forecasting System cycle 43r1 to describe energy budget variability. The model has daily average biases of −12 and 18 W m−2 for outgoing longwave and reflected shortwave TOA radiation fluxes, respectively. At the surface, the daily average bias is 12(13) W m−2 for the longwave downwelling (upwelling) radiation flux and −21(−13) W m−2 for the shortwave downwelling (upwelling) radiation flux. Using multivariate linear models of observation–model differences, we attribute radiation flux discrepancies to physical processes, and link surface and TOA fluxes. We find that model biases in surface radiation fluxes are mainly due to a low bias in ice water path (IWP), poor description of surface albedo and model–observation differences in surface temperature. We also attribute observed discrepancies in the radiation fluxes, particularly during the dry season, to the misrepresentation of aerosol fields in the model from use of a climatology instead of a dynamic approach. At the TOA, the low IWP impacts the amount of reflected shortwave radiation while biases in outgoing longwave radiation are additionally coupled to discrepancies in the surface upwelling longwave flux and atmospheric humidity
Issue Date: 21-Dec-2017
Date of Acceptance: 4-Nov-2017
URI: http://hdl.handle.net/10044/1/55809
DOI: https://dx.doi.org/10.5194/acp-17-15095-2017
ISSN: 1680-7316
Publisher: Copernicus Publications
Start Page: 15095
End Page: 15119
Journal / Book Title: Atmospheric Chemistry and Physics
Volume: 17
Issue: 24
Copyright Statement: © Author(s) 2017. This work is distributed under the Creative Commons Attribution 4.0 License.
Sponsor/Funder: Natural Environment Research Council (NERC)
Funder's Grant Number: JJR/NCEO/ContFP1
Keywords: Science & Technology
Physical Sciences
Meteorology & Atmospheric Sciences
OPTICAL DEPTH
CLIMATE
DUST
REANALYSIS
CAMPAIGN
FACILITY
Science & Technology
Physical Sciences
Meteorology & Atmospheric Sciences
OPTICAL DEPTH
CLIMATE
DUST
REANALYSIS
CAMPAIGN
FACILITY
0401 Atmospheric Sciences
0201 Astronomical And Space Sciences
Meteorology & Atmospheric Sciences
Publication Status: Published
Open Access location: https://www.atmos-chem-phys.net/17/15095/2017/acp-17-15095-2017.html
Appears in Collections:Space and Atmospheric Physics
Physics



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Creative Commonsx