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Local-Scale Urban Meteorological Parameterization Scheme (LUMPS): longwave radiation parameterization and seasonality related developments

Journal article
Authors Thomas Lordian
C.S.B. Grimmond
Brian Offerle
Duick Young
Thomas EL Smith
Leena Järvi
Fredrik Lindberg
Published in Journal of Applied Meteorology and Climatology
Volume 50
Pages 185–202
ISSN 1558-8424
Publication year 2011
Published at
Pages 185–202
Language en
Keywords Urban Parameterization Scheme, Urban Energy Balance, Longwave Radiation Model, Ceilometer
Subject categories Climate Research, Meteorology and Atmospheric Sciences

Abstract

Recent developments to the Local-scale Urban Meteorological Parameterization Scheme (LUMPS), a simple model able to simulate the urban energy balance are presented. The major development is the coupling of LUMPS to the Net All-Wave Radiation Parameterization (NARP). Others include that the model now accounts for: changing availability of water at the surface; seasonal variations of active vegetation; and the anthropogenic heat flux; while maintaining the need for only commonly available meteorological observations and basic surface characteristics. The incoming component of the longwave radiation (L↓) in NARP is improved through a simple relation derived using cloud cover observations from a ceilometer collected in central London. The new L↓ formulation is evaluated with two independent multi-year datasets (Łódź, Poland and Baltimore, USA) and compared to alternatives that include: the original NARP and a simpler one using the U. S. National Climatic Data Center cloud observation database as input. The performance for the surface energy balance fluxes is assessed using a two year dataset (Łódź). Results have an overall RMSE < 34W m-2 for all surface energy balance fluxes over the two year period when using L↓ as forcing, and RMSE < 43 W m-2 for all seasons in 2002 with all other options implemented to model L↓.

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