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Use of Sun-Induced Chlorophyll Fluorescence Obtained by OCO-2 and GOME-2 for GPP Estimates of the Heihe River Basin, China.
- Source :
- Remote Sensing; Dec2018, Vol. 10 Issue 12, p2039, 1p
- Publication Year :
- 2018
-
Abstract
- 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 SIF<subscript>757</subscript> had stronger correlations with daily tower GPP than daily SIF<subscript>771</subscript>, and the correlation between daily SIF<subscript>757</subscript> and daily tower GPP was stronger than the correlation between 16-d averaged SIF<subscript>740</subscript> 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_SIF<subscript>757</subscript>, then GPP_SIF<subscript>771</subscript> and GPP_ SIF<subscript>740</subscript>. 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<subscript>scalar</subscript> × W<subscript>scalar</subscript>) can result in differences between OCO-2 SIF and GOME-2 SIF. [ABSTRACT FROM AUTHOR]
- Subjects :
- CHLOROPHYLL spectra
OZONE
CHLOROPHYLL
PHOTOSYNTHESIS
FLUORESCENCE
Subjects
Details
- Language :
- English
- ISSN :
- 20724292
- Volume :
- 10
- Issue :
- 12
- Database :
- Complementary Index
- Journal :
- Remote Sensing
- Publication Type :
- Academic Journal
- Accession number :
- 133722434
- Full Text :
- https://doi.org/10.3390/rs10122039