Afforestation for improving valley urban air quality
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Authors
Chu, Peter C.
Chen, Yuchun
Lu, Shihua
Subjects
Advisors
Date of Issue
2005
Date
2005
Publisher
Language
Abstract
Lanzhou is one of the major cities in northwest China and the capital of Gansu Province
and located at a narrow (2-8 km width), long (40-km), NW-SE oriented valley basin
(elevation: 1,500- 1,600-m) with the Tibetan plateau in the west, Baita mountain (above
1,700-m elevation) in the north, and the Gaolan mountain in the south. Due to
topographic and meteorological characteristics, Lanzhou is one of the most polluted
cities in China. Meteorological conditions (low winds, stable stratification especially
inversion), pollutant sources and sinks affect the air quality. Afforestation changes the
mountain-valley local circulation system, destabilizes the atmosphere, and weakens the
inversion. Besides, it may absorb some pollutants (sink). Lanzhou local government carried out afforestation and pollutant-source reduction (closing several heavy industrial factories) to improve the air-quality for the past two decades. Numerical model (RAMS-HYPACT) simulates the effect of afforestation on the air pollution control.
Type
Conference Proceedings
Description
Air Quality Management at Urban, Regional, and Global Scales, Third International Symposium on Air Quality Management
Series/Report No
Department
Department of Oceanography
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Citation
Chu, P.C., Y.C. Chen, and S.H. Lu, Afforestation for improving valley urban air quality. Air Quality Management at Urban, Regional, and Global Scales, Third International Symposium on Air Quality Management, 1379-1388
Distribution Statement
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.