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ChinaSpec: a Network for Long-term Ground-based Measurements of Solar-induced Fluorescence in China
  • +16
  • Yongguang Zhang,
  • Qian Zhang,
  • Liangyun Liu,
  • Wang Shao-qiang,
  • Weimin Ju,
  • Jianwu Tang,
  • Ying Huang,
  • Xudong Zhu,
  • Feng Wang,
  • Jinsong Zhang,
  • Guangsheng Zhou,
  • Li Zhou,
  • Xuguang Tang,
  • Zhaoying Zhang,
  • Bo Qiu,
  • Xiaokang Zhang,
  • Songhan Wang,
  • Yangjian Zhang,
  • Changping Huang
Yongguang Zhang
Nanjing University

Corresponding Author:[email protected]

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Qian Zhang
Nanjing University
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Liangyun Liu
Institute of Remote Sensing and Digital Earth
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Wang Shao-qiang
Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
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Weimin Ju
Internation Institute of Earth Sysmte Science
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Jianwu Tang
Marine Biological Laboratory
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Ying Huang
State Key Laboratory of Estuarine and Coastal Research, East China Normal University
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Xudong Zhu
Xiamen University
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Feng Wang
Institute of Desertification Studies, Chinese Academy of Forestry
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Jinsong Zhang
Research Institute of Forestry, Chinese Academy of Forestry
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Guangsheng Zhou
Chinese Academy of Meteorological Sciences
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Li Zhou
State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Science,
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Xuguang Tang
Southwest University
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Zhaoying Zhang
Nanjing University
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Bo Qiu
Nanjing University
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Xiaokang Zhang
Nanjing University
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Songhan Wang
International Institute for Earth System Sciences,Nanjing University
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Yangjian Zhang
Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences
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Changping Huang
Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences
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Remotely sensed solar-induced fluorescence (SIF) has emerged as a novel and powerful approach for terrestrial vegetation monitoring. Continuous measurements of SIF in synergy with concurrent eddy covariance (EC) flux measurements can provide a new opportunity to advance terrestrial ecosystem science. Here we introduce a network of ground-based continuous SIF observations at flux tower sites across the mainland China referred to as ChinaSpec. The network consists of sixteen tower sites including 6 cropland sites, 4 grassland sites, 4 forest sites and 2 wetland sites. An automated SIF system was deployed at each of these sites to collect continuous high resolution spectra for high-frequency SIF retrievals in synergy with EC flux measurements. The goal of ChinaSpec is to provide long-term ground-based SIF measurements and promote the collaborations between optical remote sensing and EC flux observation communities in China. We present here the details of instrument specifications, data collection and processing procedures, data sharing and utilization protocols, and future plans. Furthermore, we show the examples how ground-based SIF observations can be used to track vegetation photosynthesis from diurnal to seasonal scales, and to assist in the validation of fluorescence models and satellite SIF products (e.g., from OCO-2 and TROPOMI) with the measurements from these sites since 2016. This network of SIF observations could improve our understanding of the controls on the biosphere-atmosphere carbon exchange and enable the improvement of carbon flux predictions. It will also help integrate ground-based SIF measurements with EC flux networks which will advance ecosystem and carbon cycle researches globally.
Mar 2021Published in Journal of Geophysical Research: Biogeosciences volume 126 issue 3. 10.1029/2020JG006042