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The long-term effect of increasing the albedo of urban areas

Title:

The long-term effect of increasing the albedo of urban areas

Akbari, Hashem and Matthews, H. Damon and Seto, Donny (2012) The long-term effect of increasing the albedo of urban areas. Environmental Research Letters, 7 (2). 024004. ISSN 1748-9326

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Official URL: http://dx.doi.org/10.1088/1748-9326/7/2/024004

Abstract

Solar reflective urban surfaces (white rooftops and light-colored pavements) can increase the albedo of an urban area by about 0.1. Increasing the albedo of urban and human settlement areas can in turn decrease atmospheric temperature and could potentially offset some of the anticipated temperature increase caused by global warming. We have simulated the long-term (decadal to centennial) effect of increasing urban surface albedos using a spatially explicit global climate model of intermediate complexity. We first carried out two sets of simulations in which we increased the albedo of all land areas between ±20° and ±45° latitude respectively. The results of these simulations indicate a long-term global cooling effect of 3 × 10−15 K for each 1 m2 of a surface with an albedo increase of 0.01. This temperature reduction corresponds to an equivalent CO2 emission reduction of about 7 kg, based on recent estimates of the amount of global warming per unit CO2 emission. In a series of additional simulations, we increased the albedo of urban locations only, on the basis of two independent estimates of the spatial extent of urban areas. In these simulations, global cooling ranged from 0.01 to 0.07 K, which corresponds to a CO2 equivalent emission reduction of 25–150 billion tonnes of CO2.

Divisions:Concordia University > Faculty of Arts and Science > Geography, Planning and Environment
Item Type:Article
Refereed:Yes
Authors:Akbari, Hashem and Matthews, H. Damon and Seto, Donny
Journal or Publication:Environmental Research Letters
Date:2012
Funders:
  • Concordia Open Access Author Fund
Digital Object Identifier (DOI):10.1088/1748-9326/7/2/024004
Keywords:global cooling, CO2-equivalent offset, urban albedo, cool roofs, cool pavement
ID Code:975096
Deposited By: DAVID MACAULAY
Deposited On:09 Jan 2013 15:28
Last Modified:20 Mar 2017 20:29
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