Determination of temperature roughness length for built environment with high resolution wireless meteorological stations

Daniel F. Nadeau, E. Bou-Zeid, M. B. Parlange, G. Barrenetxea, M. Vetterli

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

In this study, the scalar roughness for sensible heat in the temperature profile (z0,h) is determined based on direct skin temperature measurements and profiles of wind and temperature in a complex urban environment. Typically, skin temperatures are inferred from remotely sensed data (e.g. satellite). However, in complex environments like cities, strong heterogeneities exist in the temperature fields at scales that cannot be resolved by remote sensing. Because they are more precise, in situ measurements, when available, offer a more reliable alternative than remote sensing measurements for measuring temperature. In this study, 91 wireless weather stations spread over a complex urban area of 300 x 450 m offer high temporal and spatial resolution meteorological measurements from December 2006 to April 2007. The study site is the campus of the Ecole Polytechnique Federale de Lausanne. The objective here is to calculate the temperature roughness length in order to estimate the sensible heat flux between the ground and the atmospheric surface layer. Calculations are based on the Monin-Obukhov similarity model for temperature in the surface layer. Wind and temperature profiles are measured using a Sound Detection and Ranging System (SODAR) and a Radio Acoustic Sound System (RASS).
Original languageEnglish
Title of host publication18th Symposium on Boundary Layers and Turbulence
PublisherAmerican Meteorological Society
Number of pages4
Publication statusPublished - 2008
Externally publishedYes
Event18th Symposium on Boundary Layers and Turbulence - Stockholm, Sweden
Duration: 9 Jul 200813 Jul 2008
Conference number: 18th

Conference

Conference18th Symposium on Boundary Layers and Turbulence
CountrySweden
CityStockholm
Period9/07/0813/07/08

Cite this