关键词: 通量贡献区模型, 滨海围垦湿地, 通量贡献区

Abstract: 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 Mmodel (FSAM). Results show that (1) the prevailing wind came from 135°-225° directionduring 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(X_m) 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 X_m 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,X_m  under 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 X_m under unstable atmosphere was at 56.49 m in the prevailing wind direction, 90% of the information about fluxeswas 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 maybe explained by the high σ_v/ u*ratio ( standard deviation of horizontal wind velocity fluctuation vs friction wind velocity) under such conditions.

Key words: FSAM(Flux Source Area model), coastal reclaimed wentlands, Footprint