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Assimilation of Surface No2 and O3 Observations Into the Silam Chemistry Transport Model : Volume 7, Issue 4 (15/08/2014)

By Vira, J.

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Book Id: WPLBN0004009722
Format Type: PDF Article :
File Size: Pages 33
Reproduction Date: 2015

Title: Assimilation of Surface No2 and O3 Observations Into the Silam Chemistry Transport Model : Volume 7, Issue 4 (15/08/2014)  
Author: Vira, J.
Volume: Vol. 7, Issue 4
Language: English
Subject: Science, Geoscientific, Model
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Sofiev, M., & Vira, J. (2014). Assimilation of Surface No2 and O3 Observations Into the Silam Chemistry Transport Model : Volume 7, Issue 4 (15/08/2014). Retrieved from http://worldebookfair.com/


Description
Description: Finnish Meteorological Institute, Helsinki, Finland. This paper describes assimilation of trace gas observations into the chemistry transport model SILAM using the 3D-Var method. Assimilation results for year 2012 are presented for the prominent photochemical pollutants ozone (O3) and nitrogen dioxide (NO2). Both species are covered by the Airbase observation database, which provides the observational dataset used in this study.

Attention is paid to the background and observation error covariance matrices, which are obtained primarily by iterative application of a posteriori diagnostics. The diagnostics are computed separately for two months representing summer and winter conditions, and further disaggregated by time of day. This allows deriving background and observation error covariance definitions which include both seasonal and diurnal variation. The consistency of the obtained covariance matrices is verified using Χ2 diagnostics.

The analysis scores are computed for a control set of observation stations withheld from assimilation. Compared to a free-running model simulation, the correlation coefficient for daily maximum values is improved from 0.8 to 0.9 for O3 and from 0.53 to 0.63 for NO2.


Summary
Assimilation of surface NO2 and O3 observations into the SILAM chemistry transport model

Excerpt
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