期刊
REMOTE SENSING
卷 10, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/rs10122039
关键词
vegetation photosynthesis model; sun-induced fluorescence; gross primary productivity; eddy covariance; carbon cycle
类别
资金
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA19040504]
- National Natural Science Foundation of China [41771466, 41730752, 41861040]
- National Key Research and Development Program of China [2016YFC0500201]
- Special Fund for Key Program of Science and Technology of Qinghai Province [2017-SF-A6]
Sun-induced chlorophyll fluorescence (SIF) provides a new method for monitoring vegetation photosynthesis from space and has been widely used to estimate gross primary productivity (GPP). However, the ability of SIF obtained from the Orbital Carbon Observatory 2 (OCO-2 SIF) and Global Ozone Monitoring Experiment-2 (GOME-2) to estimate GPP in the cold and arid region of Heihe River Basin remains unclear because previous comparisons were insufficient. Here, we choose maize and alpine meadow to evaluate the performance of SIF obtained by OCO-2 and GOME-2 in GPP estimations. The results of this study show that daily SIF757 had stronger correlations with daily tower GPP than daily SIF771, and the correlation between daily SIF757 and daily tower GPP was stronger than the correlation between 16-d averaged SIF740 and 16-d averaged tower GPP. The 16-d averaged absorbed photosynthetically active radiation (APAR) and reconstructed sun-induced fluorescence (RSIF) had the strongest linear correlations with 16-d averaged tower GPP. GPP_VPM and GPP_RSIF exhibited the best performance in GPP estimation, closely followed by GPP_SIF757, then GPP_SIF771 and GPP_SIF740. We also found that the robustness of the correlation coefficients of OCO-2 SIF with GOME-2 SIF was highly dependent on the size of their spatial footprint overlaps, indicating that the spatial differences between OCO-2 and GOME-2 footprints contribute to the differences in GPP estimates between OCO-2 and GOME-2. In addition, the differences of viewing zenith angle (VZA), cloud contamination, scale effects, and environmental scalars (T-scalar x W-scalar) can result in differences between OCO-2 SIF and GOME-2 SIF.
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