Top-of-atmosphere radiative cooling with white roofs: Experimental verification and model-based evaluation

Francisco Salamanca; Shaheen Tonse; Surabi Menon; Vishal Garg; Krishna P. Singh; Manish Naja; Marc L. Fischer

doi:10.1088/1748-9326/7/4/044007

Top-of-atmosphere radiative cooling with white roofs: Experimental verification and model-based evaluation

Francisco Salamanca, Shaheen Tonse, Surabi Menon, Vishal Garg, Krishna P. Singh, Manish Naja, Marc L. Fischer

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

We evaluate differences in clear-sky upwelling shortwave radiation reaching the top of the atmosphere in response to increasing the albedo of roof surfaces in an area of India with moderately high aerosol loading. Treated (painted white) and untreated (unpainted) roofs on two buildings in northeast India were analyzed on five cloudless days using radiometric imagery from the IKONOS satellite. Comparison of a radiative transfer model (RRTMG) and radiometric satellite observations shows good agreement (R²=0.927). Results show a mean increase of 50Wm² outgoing at the top of the atmosphere for each 0.1 increase of the albedo at the time of the observations and a strong dependence on atmospheric transmissivity.

Original language	English (US)
Article number	044007
Journal	Environmental Research Letters
Volume	7
Issue number	4
DOIs	https://doi.org/10.1088/1748-9326/7/4/044007
State	Published - Oct 2012
Externally published	Yes

Keywords

aerosol loading
cool roof
radiation balance
satellite radiometry
surface reflectance
urban systems
white roof

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
General Environmental Science
Public Health, Environmental and Occupational Health

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10.1088/1748-9326/7/4/044007

Cite this

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title = "Top-of-atmosphere radiative cooling with white roofs: Experimental verification and model-based evaluation",

abstract = "We evaluate differences in clear-sky upwelling shortwave radiation reaching the top of the atmosphere in response to increasing the albedo of roof surfaces in an area of India with moderately high aerosol loading. Treated (painted white) and untreated (unpainted) roofs on two buildings in northeast India were analyzed on five cloudless days using radiometric imagery from the IKONOS satellite. Comparison of a radiative transfer model (RRTMG) and radiometric satellite observations shows good agreement (R2=0.927). Results show a mean increase of 50Wm2 outgoing at the top of the atmosphere for each 0.1 increase of the albedo at the time of the observations and a strong dependence on atmospheric transmissivity.",

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T2 - Experimental verification and model-based evaluation

AU - Salamanca, Francisco

AU - Tonse, Shaheen

AU - Menon, Surabi

AU - Garg, Vishal

AU - Singh, Krishna P.

AU - Naja, Manish

AU - Fischer, Marc L.

PY - 2012/10

Y1 - 2012/10

N2 - We evaluate differences in clear-sky upwelling shortwave radiation reaching the top of the atmosphere in response to increasing the albedo of roof surfaces in an area of India with moderately high aerosol loading. Treated (painted white) and untreated (unpainted) roofs on two buildings in northeast India were analyzed on five cloudless days using radiometric imagery from the IKONOS satellite. Comparison of a radiative transfer model (RRTMG) and radiometric satellite observations shows good agreement (R2=0.927). Results show a mean increase of 50Wm2 outgoing at the top of the atmosphere for each 0.1 increase of the albedo at the time of the observations and a strong dependence on atmospheric transmissivity.

AB - We evaluate differences in clear-sky upwelling shortwave radiation reaching the top of the atmosphere in response to increasing the albedo of roof surfaces in an area of India with moderately high aerosol loading. Treated (painted white) and untreated (unpainted) roofs on two buildings in northeast India were analyzed on five cloudless days using radiometric imagery from the IKONOS satellite. Comparison of a radiative transfer model (RRTMG) and radiometric satellite observations shows good agreement (R2=0.927). Results show a mean increase of 50Wm2 outgoing at the top of the atmosphere for each 0.1 increase of the albedo at the time of the observations and a strong dependence on atmospheric transmissivity.

KW - aerosol loading

KW - cool roof

KW - radiation balance

KW - satellite radiometry

KW - surface reflectance

KW - urban systems

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Top-of-atmosphere radiative cooling with white roofs: Experimental verification and model-based evaluation

Abstract

Keywords

ASJC Scopus subject areas

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