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The representation of tropical upper tropospheric water in EC Earth V2
Chalmers University of Technology.
Chalmers University of Technology.
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Rymdteknik.
SMHI.
Vise andre og tillknytning
2012 (engelsk)Inngår i: Climate Dynamics, ISSN 0930-7575, E-ISSN 1432-0894, Vol. 39, nr 11, s. 2713-2731Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Tropical upper tropospheric humidity, clouds, and ice water content, as well as outgoing longwave radiation (OLR), are evaluated in the climate model EC Earth with the aid of satellite retrievals. The Atmospheric Infrared Sounder and Microwave Limb Sounder together provide good coverage of relative humidity. EC Earth's relative humidity is in fair agreement with these observations. CloudSat and CALIPSO data are combined to provide cloud fractions estimates throughout the altitude region considered (500-100 hPa). EC Earth is found to overestimate the degree of cloud cover above 200 hPa and underestimate it below. Precipitating and non-precipitating EC Earth ice definitions are combined to form a complete ice water content. EC Earth's ice water content is below the uncertainty range of CloudSat above 250 hPa, but can be twice as high as CloudSat's estimate in the melting layer. CERES data show that the model underestimates the impact of clouds on OLR, on average with about 9 W m -2. Regionally, EC Earth's outgoing longwave radiation can be ~20 W m -2 higher than the observation. A comparison to ERA-Interim provides further perspectives on the model's performance. Limitations of the satellite observations are emphasised and their uncertainties are, throughout, considered in the analysis. Evaluating multiple model variables in parallel is a more ambitious approach than is customary.

sted, utgiver, år, opplag, sider
2012. Vol. 39, nr 11, s. 2713-2731
Emneord [en]
Earth sciences - Atmosphere and hydrosphere sciences
Emneord [sv]
humidity, clouds, IWC, tropics, climate, satellite, Geovetenskap - Atmosfärs- och hydrosfärsvetenskap
HSV kategori
Forskningsprogram
Rymdteknik
Identifikatorer
URN: urn:nbn:se:ltu:diva-7816DOI: 10.1007/s00382-012-1511-0ISI: 000310870200007Scopus ID: 2-s2.0-84868686771Lokal ID: 63c205cb-1939-4626-813d-2a599d198b83OAI: oai:DiVA.org:ltu-7816DiVA, id: diva2:980706
Merknad
Validerad; 2012; 20111219 (saleli)Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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Totalt: 71 treff
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