In-situ measurement of atmospheric CFC-11 at the Shangdianzi Global Atmosphere Watch(GAW) Regional Station

作     者：ZHANG Fang ZHOU LingXi YAO Bo ZHANG XiaoChun XU Lin ZHANG XiaoLing ZHOU HuaiGang DONG Fan ZHOU LiYan 

作者机构：Key Laboratory for Atmospheric Chemistry Centre for Atmosphere Watch and Services (CA WAS) Chinese Academy of Meteorological Sciences (CAMS) China Meteorological Administration ( CMA ) Beijing 100081 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Institute of Urban Meteorology (IUM) China Meteorological Administration (CMA) Beijing 100089 China Miyun County Meteorological Bureau Beijing 101500 China 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2011年第54卷第2期

页      面：298-304页

核心收录：

学科分类：07[理学] 08[工学] 070602[理学-大气物理学与大气环境] 081601[工学-大地测量学与测量工程] 0816[工学-测绘科学与技术] 0706[理学-大气科学] 

基　　金：supported by Non-profit Research Project to Serve the Public Interest (Grant No. GYHY200806026) International S&T Cooperation Program of MOST (Grant No. 2007DFA20650) Research Fund for Returned Overseas Chinese Scholars of the State Education Ministry (Grant No. 1108) 

主　　题：SDZ background CFC-11 seasonal variation winds 

摘      要：An in-situ GC-ECD system was used to measure halocarbons at Shangdianzi （SDZ） GAW regional station. In this paper, we reported observational results of atmospheric CFC- 11 （CCI3F） mixing ratios from April 2007 to March 2008. The CFC- 11 time series showed large variability. Approximately 62% observed values were filtered as non-background data. The median, 10% and 90% percentiles of CFC-11 background mixing ratios were 245.4 ppt （10-12 mol/mol）, 244.6 ppt and 246.1 ppt, respectively; whereas those of non-background CFC- 11 mixing ratios were 254.7, 246.6 and 272.1 ppt, respectively. Significant differences in background and non-background CFC-11 mixing ratios were observed between summer and autumn, mainly because of the CFC-11 stored in loam being prone to atmospheric release in hot seasons. Comparison of tile SDZ data with the five AGAGE stations suggested agreement with mid-high latitude Northern Hemisphere stations MHD, THD and RPB. The SDZ data were higher than that of Southern Hemisphere stations CGO and SMO. Higher CFC-11 mixing ratios measured in different seasons were always associated with winds from the W-WSW-SW sector, indicating that the airflow coming from this wind sector has a positive contribution to CFC- 11 concentrations. The CFC-11 mixing ratios were higher in autumn and summer than in spring and winter, in which its mixing ratios were very close to the atmospheric background level. This was happened especially when airflow originated from the NNE-NE-ENE-E sector, indicating the air masses coming from these wind directions was relatively clean.