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Title: A Sensitivity Study of the Urban Effect on a Regional-Scale Model: An Idealized Case

Abstract

Urban infrastructure impacts the surface and atmospheric properties, such as wind, temperature, turbulence and radiation budgets. The well-recognized urban heat island phenomenon, characterized by the temperature contrast between the city and the surrounding rural area, is one such impact. Many field experiments have been conducted to study the urban heat island effect, which is typically most intense under clear sky and weak ambient wind conditions at night. In some cases, a cool island may even exist during the day. To consider these urban effects in a numerical model with horizontal grid resolution on the order of kilometers, some sort of parameterization is required to account for the sub-grid building impacts on these effects. To this end, Brown and Williams (1998) have developed an urban parameterization by extending Yamada's (1982) forest canopy scheme to include drag, turbulent production, anthropogenic and rooftop heating effects, and radiation balance in a mesoscale model. In this study, we further modify this urban parameterization by adding the rooftop surface energy equation to eliminate a simplifying assumption that the rooftop is at the same temperature as the air. The objective of this work is to assess the impact of individual process of this modified urban canopy parameterizationmore » for the urban heat island phenomenon.« less

Authors:
; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (US)
Sponsoring Org.:
USDOE Office of Defense Programs (DP) (US)
OSTI Identifier:
791718
Report Number(s):
UCRL-JC-139167
TRN: US200303%%69
DOE Contract Number:  
W-7405-Eng-48
Resource Type:
Conference
Resource Relation:
Conference: 3rd Symposium on the Urban Environment, Davis, CA (US), 08/14/2000--08/18/2000; Other Information: PBD: 30 May 2000
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; FORESTS; HEATING; PRODUCTION; RADIATIONS; RESOLUTION; RURAL AREAS; SENSITIVITY; SURFACE ENERGY; TURBULENCE

Citation Formats

Chin, H N.S., Leach, M J, and Brown, M J. A Sensitivity Study of the Urban Effect on a Regional-Scale Model: An Idealized Case. United States: N. p., 2000. Web.
Chin, H N.S., Leach, M J, & Brown, M J. A Sensitivity Study of the Urban Effect on a Regional-Scale Model: An Idealized Case. United States.
Chin, H N.S., Leach, M J, and Brown, M J. Tue . "A Sensitivity Study of the Urban Effect on a Regional-Scale Model: An Idealized Case". United States. https://www.osti.gov/servlets/purl/791718.
@article{osti_791718,
title = {A Sensitivity Study of the Urban Effect on a Regional-Scale Model: An Idealized Case},
author = {Chin, H N.S. and Leach, M J and Brown, M J},
abstractNote = {Urban infrastructure impacts the surface and atmospheric properties, such as wind, temperature, turbulence and radiation budgets. The well-recognized urban heat island phenomenon, characterized by the temperature contrast between the city and the surrounding rural area, is one such impact. Many field experiments have been conducted to study the urban heat island effect, which is typically most intense under clear sky and weak ambient wind conditions at night. In some cases, a cool island may even exist during the day. To consider these urban effects in a numerical model with horizontal grid resolution on the order of kilometers, some sort of parameterization is required to account for the sub-grid building impacts on these effects. To this end, Brown and Williams (1998) have developed an urban parameterization by extending Yamada's (1982) forest canopy scheme to include drag, turbulent production, anthropogenic and rooftop heating effects, and radiation balance in a mesoscale model. In this study, we further modify this urban parameterization by adding the rooftop surface energy equation to eliminate a simplifying assumption that the rooftop is at the same temperature as the air. The objective of this work is to assess the impact of individual process of this modified urban canopy parameterization for the urban heat island phenomenon.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}

Conference:
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