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'Down-to-Earth' modelling of equivalent surface precipitation using multisource data and radar
SMHI, Samhälle och säkerhet.ORCID-id: 0000-0001-7370-8788
SMHI, Forskningsavdelningen, Klimatforskning - Rossby Centre.
SMHI, Forskningsavdelningen, Atmosfärisk fjärranalys.
Vise andre og tillknytning
2005 (engelsk)Inngår i: Quarterly Journal of the Royal Meteorological Society, ISSN 0035-9009, E-ISSN 1477-870X, Vol. 131, nr 607, s. 1093-1112Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The estimation of surface rainfall from reflectivity data derived from weather radar has been much studied over many years. It is now clear that central to this problem is the adjustment of these data for the impacts of vertical variations in the reflectivity. In this paper a new procedure (known as Down-to-Earth, DTE) is proposed and tested for combining radar measurements aloft with information from a numerical weather-prediction (NWP) model and an analysis system. The procedure involves the exploitation of moist cloud physics in an attempt to account for physical processes impacting on precipitation during its descent from the height of radar echo measurements to the surface. The application of DTE leads to increased underestimation in the radar measurements compared to precipitation gauge observations at short and intermediate radar ranges (0-120 km), but is successful at reducing the bias at further ranges. However the application of DTE does not lead to significant decreases in the random error of the surface rain rate estimate. No improvement is made when attempting to account for the precipitation phase measured by radar. It is concluded that further work on radar data quality control, along with improvements to the NWP model, are essential to improve upon results using such a physically based procedure.

sted, utgiver, år, opplag, sider
2005. Vol. 131, nr 607, s. 1093-1112
Emneord [en]
cloud physics, evaporation, vertical reflectivity profile
HSV kategori
Forskningsprogram
Fjärranalys
Identifikatorer
URN: urn:nbn:se:smhi:diva-1279DOI: 10.1256/qj.03.203ISI: 000228964200013OAI: oai:DiVA.org:smhi-1279DiVA, id: diva2:819752
Tilgjengelig fra: 2015-06-11 Laget: 2015-05-26 Sist oppdatert: 2017-12-04bibliografisk kontrollert

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