ISSN 1002-1027　　CN 11-2952/G2

### Adjoint Model of Atmospheric Chemistry Transport Model CAMx: Construction and Application

LIU Feng1ZHANG Yuanhang,SU Hang,HU Jianlin

1. College of Environmental Sciences and Engineering, Peking University, Beijing，100871； 1Institute of Chemical Defense, Beijing，102205, E-mail:fliu_pku@sina.com
• Received:2006-09-10 Online:2007-11-20 Published:2007-11-20

Abstract: Based on the atmospheric chemistry transport model CAMx, its adjoint model is constructed. The adjoint model code is hand-generated and numerical experiments are designed to test and validate the code. CAMx and its adjoint model are applied for simulation and sensitivity analysis of air pollution in the Pearl River Delta. The sensitivities of high ground level sulfur dioxide and ozone respect to pollutant sources are calculated, and the applicability of linear sensitivity coefficients is discussed through numerical experiments, which provide important information for extensive analysis of pollution mechanisms and control strategies. Using the adjoint model, the sensitivities of an object function respect to thousands of input variables can be calculated efficiently. With the introduction of the adjoint method, the function of CAMx is considerably extended, and provides a powerful tool for inverse problems on emission parameters as well as for management of atmospheric environment.