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基于FSAM模型的城市碳通量观测贡献区研究
袁庄鹏, 赵 敏
上海师范大学
摘要:
全球变化背景下,城市二氧化碳排放是全球大气二氧化碳的重要来源.以上海市奉贤区为研究对象,基于涡度相关观测系统所获得的通量观测数据,应用FSAM(the Flux Source Area Model)模型,分析了不同大气条件、不同风向下通量贡献区的分布及时间动态.结果表明:大气稳定度会影响通量贡献区的范围,表现为不稳定大气条件下通量贡献区长度为66~491 m,稳定条件下通量贡献区长度为94~1047 m.风向对通量贡献区的影响表现为在主风风向90°~180°,稳定大气条件下(通量贡献p为0.9时)通量贡献区的范围为94~1047 m,垂直于迎风方向的宽度为335 m;其他风向的通量贡献区分布与主风风向各不相同,分别为103~1146,122~1337,110~1256 m.通量贡献区具有明显的昼夜变化特征,表现为夜间通量区范围大于白天.
关键词:  涡度相关观测  大气稳定度  风向  土地利用  城市生态系统
DOI:
分类号:
基金项目:国家自然科学基金项目(31100354);上海市教委重点学科项目(J50402);上海市科技兴农重点攻关项目(沪农科攻字(2009)第9-6号).
Research of flux footprint of city based on the FSAM model
YUAN Zhuangpeng, ZHAO Min
College of Tourism,Shanghai Normal University
Abstract:
The research of urban ecological system carbon plays a very important role in global climate change area.In this study,based on the eddy covariance system of Shanghai′s peri-urban forest and FSAM model (the Flux-Source Area Model),the distribution of footprint was analyzed in the different atmospheric conditions,wind directions,and the diurnal dynamics of footprint.Results showed that:The footprint in unstable atmospheric conditions was 66-491 m,but in the stable atmospheric conditions was 94-1047 m.The wind directions influenced the footprint,the range of source areas was 94-1047 m in the prevailing wind direction (90°-180°),while it was 335 m in the vertical upwind,and other wind directions of the flux source distributions were different from the above,the range of source areas were 103-1146,122-1337,110-1256 m,respectively.The diurnal variation of footprint appeared a rule that the footprint was larger in night than in the day.
Key words:  eddy covariance system  atmospheric stability  direction of the wind  land utilization  urban ecological system