摘要
利用通量贡献区模型（FSAM）对崇明东滩滨海围垦湿地生长季和非生长季的CO2通量贡献区（Footprint）进行分析,结果表明：（1）135°～225°方向为生长季主风向,而315°～45°方向为非生长季主风向.（2）在生长季主风向,大气稳定状态下的Footprint 函数取得最大值时的位置（Xm）为96. 84 m,90%的通量信息来源于迎风向41. 04～378. 20 m、垂直迎风向-79. 73～79. 73 m 范围内;而大气不稳定状态下的Xm 为75. 28 m,90%的通量信息来源于迎风向33. 83～257. 07 m、垂直迎风向-82. 29～82. 29 m 范围内.在非生长季主风向,大气稳定状态下的Xm 为82. 68m,90%的通量信息来源于迎风向36. 73～282. 49 m、垂直迎风向-120. 31～120. 31 m 范围内;而大气不稳定状态下的Xm为56. 49 m,90%的通量信息来源于迎风向25. 90～179. 90 m、垂直迎风向-76. 30～76. 30 m 范围内.（3） 非主风向贡献区分布与主风向有相似的规律.在生长季和非生长季,大气稳定状态下的贡献区面积均要大于大气不稳定状态下的贡献区面积;而在相同的大气稳定状态下,生长季的贡献区面积要大于非生长季.（4）在非生长季,主风向观测的垂直迎风向范围要远大于其他风向,这可能和该条件下的横向风速脉动标准差与摩擦风速的比值（σv / u？）较大有关.
Analysis of CO2 Footprint of coastal polder wetlands in Dongtan of Chongming during the crop growing season and dormant season was done using the flux source area model(FSAM). Results show that(1) the prevailing wind came from 135°- 225° direction during the crop growing season,and from 315°- 45° during the dormant season;(2) During the crop growing season,the location where the footprint function reaches the maximum in vaule(Xm) under stable atmosphere was at 96. 84 m in the direction of the prevailing winds; 90% of the information about fluxes was obtained in the range of 41. 04- 378. 20 m in the upwind direction and of- 79. 73- 79. 73 m in the vertical upwind direction,and Xm under unstable atmosphere was at 75. 28 m,90% of the information about fluxes was obtained in the range of 33. 83-257. 07 m in the upwind direction and of- 82. 29- 82. 29 m in the vertical upwind direction,while during the dormant season,Xmunder stable atmosphere was at 82. 68 m in the prevailing wind direction,90% of the information about fluxes was obtained in the range of 36. 73- 282. 49 m in the upwing direction and of- 120. 31- 120. 31 m in the vertical upwind direction,and Xmunder unstable atmosphere was at 56. 49 m in the prevailing wind direction,90% of the information about fluxes was obtained in the range of 25. 90- 179. 90 m in the upwind direction and of- 76. 30- 76. 30 m in the vertical upwind direction;(3) Similar patterns of footprint distribution were found in the prevailing and non-prevailing wind directions,showing that the source area was much larger under stable atmosphere than under unstable atmosphere,regardless of the season,growing or dormant,and under similar stable atmosphere,the source area was larger in the growing season than in the dormant season;(4) In the dormant season,the range of observed vertical upwind direction was larger in the prevailing wind direction than in the other directions,which may be explained by the high σv/u*ratio( standard deviation of horizontal wind velocity fluctuation vs fricti
出处
《生态与农村环境学报》
CAS
CSCD
北大核心
2014年第5期588-594,共7页
Journal of Ecology and Rural Environment
基金
国家科技支撑计划(2010BAK69B15)
上海市科委科技创新行动计划(11dz1210903)
关键词
通量贡献区模型
滨海围垦湿地
通量贡献区
FSAM(Flux Source Area model)
coastal reclaimed wentland
Footprint
