杭州市主要温室气体浓度变化特征  

Concentration variety characteristics of main greenhouse gases in Hangzhou

作　　者：陈超[1] 杨乐[2] 徐鸿[2] 徐昶[2] 

机构地区：[1]杭州市环境保护科学研究院,浙江杭州310014 [2]杭州市环境监测中心站,浙江杭州310007

出　　处：《环境污染与防治》2014年第1期69-72,96,共5页Environmental Pollution & Control

摘　　要：通过在线观测获得2012年杭州市华家池环境空气测点的两种主要温室气体(CH4和CO2)数据,以研究杭州市CO2、CH4的浓度变化规律及源与汇对其的影响。结果表明:(1)2012年,华家池环境空气测点CO2、CH4年日均值分别为835、1.47mg/m3。(2)CH4和CO2呈现较明显的日变化趋势,7:00左右达到最大值,15:00左右达到最小值。(3)CO2月均值较低的月份为7—9月,较高的月份为11—12月;CH4月均值较低的月份为7—8月,较高的月份为10月。CO2浓度在冬季最高,而CH4浓度在秋季最高,两者浓度在夏季均最低。CO2浓度变化主要受光合作用影响,而CH4浓度变化主要受·OH浓度影响,两者均受大气对流作用影响。(4)Spearman相关性分析表明,CO2和CH4浓度变化趋势较一致;CO2与气温具有显著负相关性,与SO2、NO2、PM10具有显著或极显著的相关性;CH4与风速具有负相关性,与PM10具有显著相关性。Main greenhouse gases （CO2and CH4 ） was continuously measured online during 2012 at Huajiachi ambient air monitoring stations to study the concentration variation,sources and sinks of CO2 and CH4 in Hangzhou. The daily average concentration of CO2 and CH4 at monitoring stations was 835,1.47 mg/m3 respectively. Diurnal variations of C H4 and CO2 were significant,with the highest concentrations observed at 7：00 and the lowest at 15..00. The monthly average CO2 concentration was lower in July-September and higher in November-December, and the monthly average CH4 concentration was lower in July-August and higher in October. CO2 and CH4 concentrations were both lowest in summer,the highest CO2 and CH4 concentrations were observed in winter and autumn respective- ly. Photosynthesis had significant effect on CO2 variation while · OH was key factor that influence the CH4 concentra- tion,both of CO2 and CH4 concentration were affected by air convection. The Spearman correlation analysis showed that the change trend of CO2 and CH4 was consistent, CO2 was negative correlated with temperature, and its correla- tion with SO2 ,CO2 and PM10 was significant ; CH4 had negative correlation with wind speed,it was closely correlated with PM10.

关 键 词：温室气体 CO2 CH4杭州市 

分 类 号：X51[环境科学与工程—环境工程]