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Ice supersaturation in the ECMWF integrated forecast system

Tompkins, Adrian M. und Gierens, Klaus und Rädel, Gaby (2007) Ice supersaturation in the ECMWF integrated forecast system. Quarterly Journal of the Royal Meteorological Society, 133, Seiten 53-63. DOI: 10.1002/qj.14.

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Offizielle URL: http://www.interscience.wiley.com

Kurzfassung

A parametrization for ice supersaturation is introduced into the ECMWF Integrated Forecast System (IFS), compatible with the cloud scheme that allows partial cloud coverage. It is based on the simple, but often justifiable, diagnostic assumption that the ice nucleation and subsequent depositional growth time-scales are short compared to the model time step, thus supersaturation is only permitted in the clear-sky portion of the grid cell. Results from model integrations using the new scheme are presented, which is demonstrated to increase upper-tropospheric humidity, decrease high-level cloud cover and, to a much lesser extent, cloud ice amounts, all as expected from simple arguments. Evaluation of the relative distribution of supersaturated humidity amounts shows good agreement with the observed climatology derived from in situ aircraft observations. With the new scheme, the global distribution of frequency of occurrence of supersaturated regions compares well with remotely sensed microwave limb sounder (MLS) data, with the most marked errors of underprediction occurring in regions where the model is known to underpredict deep convection. Finally, it is also demonstrated that the new scheme leads to improved predictions of permanent contrail cloud over southern England, which indirectly implies upper-tropospheric humidity fields are better represented for this region.

Dokumentart:Zeitschriftenbeitrag
Titel:Ice supersaturation in the ECMWF integrated forecast system
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Tompkins, Adrian M.ECMWF, Reading, UK
Gierens, KlausNICHT SPEZIFIZIERT
Rädel, GabyUniv. Reading, Reading, UK
Datum:22 Februar 2007
Erschienen in:Quarterly Journal of the Royal Meteorological Society
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:133
DOI :10.1002/qj.14
Seitenbereich:Seiten 53-63
Status:veröffentlicht
Stichwörter:cirrus clouds, ice nucleation, microphysics
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Atmosphären- und Klimaforschung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Dynamik der Atmosphäre
Hinterlegt von: Dr.rer.nat. Klaus Martin Gierens
Hinterlegt am:08 Mär 2007
Letzte Änderung:20 Okt 2014 14:31

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