Journal of East China Normal University(Natural Science) ›› 2021, Vol. 2021 ›› Issue (2): 42-53.doi: 10.3969/j.issn.1000-5641.2021.02.005

• Estuary and Coastal Research • Previous Articles     Next Articles

Flux footprint analysis of a salt marsh ecosystem in the Jiuduansha Shoals of the Changjiang Estuary

Zihan CHEN1, Ying HUANG1,2,*(), Jianwu TANG1,2,3, Bo TIAN1,2, Fang SHEN1, Pengfei WU4, Qing YUAN1, Cheng ZHOU1, Jiangtao WANG2,3   

  1. 1. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China
    2. Yangtze Delta Estuarine Wetland Ecosystem Observation and Research Station, Ministry of Education & Shanghai Science and Technology Committee, Shanghai 200241, China
    3. Institute of Eco-Chongming, Shanghai 202162, China
    4. Shanghai Jiuduansha Wetland Nature Reserve Administration, Shanghai 200136, China
  • Received:2019-10-25 Online:2021-03-25 Published:2021-04-01
  • Contact: Ying HUANG


Flux footprint analysis is an important step in studying the carbon, water vapor, and heat flux exchange of land-atmosphere interactions based on the eddy covariance (EC) method. In this research, we used the flux source area model (FSAM) to investigate seasonal flux footprints with different wind directions and atmospheric conditions on the basis of half-hourly EC measurements throughout 2018. The results showed that: ① The flux footprint area changes with the seasons. The largest flux footprint area, ordered highest to lowest, was found in autumn, summer, spring, and winter under stable stratification; meanwhile, under unstable stratification, the flux footprint area did not change significantly between seasons. The daily variation in the footprint, moreover, was obvious and the footprint was found to be larger comparatively at nighttime than that observed during the daytime. ② The flux source area under non-prevailing wind conditions was larger than that under the prevailing wind condition. ③ The flux source area was much larger under stable stratification. The distance between the location of the maximum value of the flux footprint and the station was also found to be much larger under stable stratification.

Key words: Jiuduansha Shoals, eddy covariance technique, FSAM, footprint analysis

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