Assessing the nonlinear response of fine particles to precursor emissions: development and application of an extended response surface modeling technique v1.0
An innovative extended response surface modeling technique (ERSM v1.0) is developed to characterize the nonlinear response of fine particles (PM<sub>2.5</sub>) to large and simultaneous changes of multiple precursor emissions from multiple regions and sectors. The ERSM technique is devel...
Main Authors: | , , , , , , , , , , , |
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Format: | Article |
Language: | English |
Published: |
Copernicus Publications
2015-01-01
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Series: | Geoscientific Model Development |
Online Access: | http://www.geosci-model-dev.net/8/115/2015/gmd-8-115-2015.pdf |
Summary: | An innovative extended response surface modeling technique (ERSM v1.0) is
developed to characterize the nonlinear response of fine particles
(PM<sub>2.5</sub>) to large and simultaneous changes of multiple precursor
emissions from multiple regions and sectors. The ERSM technique is developed
based on the conventional response surface modeling (RSM) technique; it
first quantifies the relationship between PM<sub>2.5</sub> concentrations and the
emissions of gaseous precursors from each single region using the
conventional RSM technique, and then assesses the effects of inter-regional
transport of PM<sub>2.5</sub> and its gaseous precursors on PM<sub>2.5</sub>
concentrations in the target region. We apply this novel technique with a
widely used regional chemical transport model (CTM) over the Yangtze River delta
(YRD) region of China, and evaluate the response of PM<sub>2.5</sub> and its
inorganic components to the emissions of 36 pollutant–region–sector
combinations. The predicted PM<sub>2.5</sub> concentrations agree well with
independent CTM simulations; the correlation
coefficients are larger than 0.98 and 0.99, and the mean normalized errors (MNEs)
are less than 1 and 2% for January and August, respectively. It is also
demonstrated that the ERSM technique could reproduce fairly well the response
of PM<sub>2.5</sub> to continuous changes of precursor emission levels between zero
and 150%. Employing this new technique, we identify the major sources
contributing to PM<sub>2.5</sub> and its inorganic components in the YRD region.
The nonlinearity in the response of PM<sub>2.5</sub> to emission changes is
characterized and the underlying chemical processes are illustrated. |
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ISSN: | 1991-959X 1991-9603 |