Quantifying the Spatial Representativeness of Carbon Flux Footprints of a Grassland Ecosystem in the Semi-Arid Region

Gong, Haixing1,2; Wang, Yanyu1,3; Wang, Guoyin1,2,4; Gao, Yuqiu5; Li, Guo6; Kuang, Zexing6; Zhuo, Xianwang1,2; Bi, Jianrong4; Wang, Peng1,7; Wang, Weijie8; Cheng, Tiantao1,7,9,10,11

2023-04-16

10.1029/2022JD038269

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   Impact Factor & Quartile

2169-897X

2169-8996

Quantifying the single-site representativeness of carbon flux footprints plays a crucial role in land-atmosphere interaction, especially in semi-arid regions with high-frequency turbulence. In this study, we used multi-platform datasets, including observational data derived from the eddy covariance flux monitoring systems of the Semi-Arid Climate and Environment Observatory of Lanzhou University (SACOL) and multivariate satellite remote sensing, to explore the distribution characteristics of carbon flux footprints during 2007-2016, using a Flux Footprint Prediction model. The relative importance of atmospheric boundary layer factors and vegetation factors on the area of carbon flux footprints was quantified by correlation analysis, multiple stepwise regression, and random forest. Physical mechanisms affecting the differences in the spatial distribution of carbon flux footprints were also analyzed. The results show that the carbon flux footprints are usually distributed on the prevailing wind side of the station, whose main contributing source area is the relatively flat grassland at the summit range of SACOL, with a spatial representativeness of 67.4-507.2 m in length and 54,982-105,329 m(2) in area. Mechanism studies have shown that the frictional velocity, vegetation Index, atmospheric instability parameters, and wind speed have significant importance on the area of carbon flux footprints due to dynamic and thermal forcing, with frictional velocity being dominant, while wind direction has a major effect on the profile shape. This study provides references for the representativeness of site fluxes for semi-arid regions dominated by grassland ecosystems where observations are often scarce.

SCI

English

Others

National Science Foundation of China["41975075","42175179","41775129"] ; Natural Science Foundation of Shanghai[22ZR1404000]

Meteorology & Atmospheric Sciences

Meteorology & Atmospheric Sciences

WOS:000962565600001

AMER GEOPHYSICAL UNION

GEOSCIENCES

Web of Science

1.Fudan Univ, Inst Atmospher Sci, Dept Atmospher & Ocean Sci, Shanghai, Peoples R China
2.Shanghai Frontiers Sci Ctr Atmosphere Ocean Intera, Shanghai, Peoples R China
3.Shanghai Acad Environm Sci, State Environm Protect Key Lab Format & Prevent Ur, Shanghai, Peoples R China
4.Lanzhou Univ, Coll Atmospher Sci, Lanzhou, Peoples R China
5.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China
6.Fudan Univ, Dept Environm Sci & Engn, Shanghai, Peoples R China
7.Fudan Univ, IRDR ICoE Risk Interconnect & Governance Weather C, Shanghai, Peoples R China
8.Duke Kunshan Univ, Environm Res Ctr, Kunshan, Peoples R China
9.Shanghai Qi Zhi Inst, Shanghai, Peoples R China
10.Zhuhai Fudan Innovat Res Inst, Innovat Ctr Ocean & Atmosphere Syst, Zhuhai, Peoples R China
11.Inst Ecochongming, Shanghai, Peoples R China

Gong, Haixing,Wang, Yanyu,Wang, Guoyin,et al. Quantifying the Spatial Representativeness of Carbon Flux Footprints of a Grassland Ecosystem in the Semi-Arid Region[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2023,128(7).

Gong, Haixing.,Wang, Yanyu.,Wang, Guoyin.,Gao, Yuqiu.,Li, Guo.,...&Cheng, Tiantao.(2023).Quantifying the Spatial Representativeness of Carbon Flux Footprints of a Grassland Ecosystem in the Semi-Arid Region.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,128(7).

Gong, Haixing,et al."Quantifying the Spatial Representativeness of Carbon Flux Footprints of a Grassland Ecosystem in the Semi-Arid Region".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 128.7(2023).