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The representation of tropical upper tropospheric water in EC Earth V2
SMHI, Forskningsavdelningen, Atmosfärisk fjärranalys.
SMHI, Forskningsavdelningen, Atmosfärisk fjärranalys.ORCID-id: 0000-0002-1391-961X
SMHI, Forskningsavdelningen, Klimatforskning - Rossby Centre.
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2012 (Engelska)Ingår i: Climate Dynamics, ISSN 0930-7575, E-ISSN 1432-0894, Vol. 39, nr 11, s. 2713-2731Artikel i tidskrift (Refereegranskat) 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 similar to 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.

Ort, förlag, år, upplaga, sidor
2012. Vol. 39, nr 11, s. 2713-2731
Nyckelord [en]
Humidity, Clouds, IWC, Tropics, Climate, Satellite
Nationell ämneskategori
Klimatforskning
Forskningsämne
Klimat
Identifikatorer
URN: urn:nbn:se:smhi:diva-430DOI: 10.1007/s00382-012-1511-0ISI: 000310870200007OAI: oai:DiVA.org:smhi-430DiVA, id: diva2:806641
Tillgänglig från: 2015-04-21 Skapad: 2015-04-14 Senast uppdaterad: 2020-05-14Bibliografiskt granskad

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Sheldon, Johnston, MarstonEliasson, SalomonJones, Colin

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Sheldon, Johnston, MarstonEliasson, SalomonJones, Colin
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Atmosfärisk fjärranalysKlimatforskning - Rossby Centre
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Climate Dynamics
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