Highlights
Three highly cited papers (top 1% in Web of Science)
Evaluate the relationship between OCO-2 SIF and flux tower based GPP
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A finer-resolution SIF from OCO-2 (GOSIF)
A global, 0.05-degree product of solar-induced chlorophyll fluorescence derived from OCO-2, MODIS, and reanalysis data. Remote Sensing, 2019.
Chlorophyll fluorescence observed by OCO-2 is strongly related to gross
primary productivity estimated from flux towers in temperate forests
Fig. 1. The availability of OCO-2 overpasses and the location of the study sites: (a) the OCO-2 overpasses on July 1, 2015 in Wisconsin, U.S.A; (b) an enlarged image showing the intensive OCO-2 soundings surrounding the two eddy covariance flux sites: Park Falls (US-PFa) and Willow Creek (US-WCr); (c) the location of the two flux sites and the land cover of the surrounding landscape. The black outlines in (a) represent the state boundary of Wisconsin.
Fig. 2. The seasonal cycles of MODIS NDVIBRDF, EVIBRDF, OCO-2 SIF (units: W m-2 μm-1 sr-1), and flux tower GPP (units: g C m-2 d-1) at Park Falls (US-PFa) (a) and Willow Creek (USWCr) (b). The error bars stand for the standard error of the mean SIF. For better visualization purposes, SIF771 was multiplied by 1.5 and NDVIBRDF was divided by 1.5, respectively.
Fig. 3. Relationships between OCO-2 SIF and tower GPP: (a) GPP versus SIF757 at the instantaneous (mid-day) timescale; (b) GPP versus SIF771 at the instantaneous (midday) timescale; (c) GPP versus SIF757 at the daily timescale; (d) GPP versus SIF771 at the daily timescale.
Fig. 7. Relationships of OCO-2 SIF and MODIS EVI with fPAR, APAR, and the product of APAR with two environmental scalars, APAR × fTmin × fVPD: (a) SIF757 versus fPAR; (b) SIF757 versus APAR; (c) SIF757 versus APAR × fTmin × fVPD; (d) EVI versus fPAR; (e) EVI versus APAR; (f) EVI versus APAR × fTmin × fVPD.
Solar-induced chlorophyll fluorescence is strongly correlated with terrestrial photosynthesis for a wide variety of biomes: First global analysis based on OCO-2 and flux tower observations
Fig. 1. OCO-2 overpasses in July, 2015 (a) and the location and distribution of 64 EC flux sites across the globe (b). The triangles stand for EC flux sites. These sites were identified for concurrent availability of OCO-2 SIF and flux tower observations over the period from September 2014 to present after screening over 800 flux sites. The land cover map is from the MODIS Land Cover Type product (MCD12Q1) based on the University of Maryland (UMD) classification scheme.
Fig. 2. The relationships between tower GPP and OCO-2 SIF at 64 flux tower sites encompassing eight major biomes. (a) GPP vs. SIF757 at the midday (or instantaneous) timescale (GPP = 19.97 9 SIF757 1.17); (b) GPP vs. SIF771 at the midday (or instantaneous) timescale (GPP = 26.16 9 SIF771 0.38); (c) GPP vs. SIF757 at the daily timescale (GPP = 21.38 9 SIF757 0.14); (d) GPP vs. SIF771 at the daily timescale (GPP = 28.04 9 SIF771 + 0.28).
Fig. 6. Scatter plots of daily tower GPP and OCO-2 SIF for individual biomes: (a) evergreen needleleaf forests (ENF); (b) evergreen broadleaf forests (EBF); (c) deciduous broadleaf forests (DBF); (d) mixed forests (MF); (e) open shrublands (OSH); (f) savannas (SAV); (g) grasslands (GRA); (h) croplands (CRO). The solid lines represent the fitted regression lines. The relationship between SIF and GPP for croplands was stronger (R2 = 0.79, p < 0.0001) when the two outliers highlighted by the blue circle were removed.
Fig. 10. The seasonal cycles of OCO-2 SIF, flux tower GPP, two environmental scalars (fTmin and fVPD), and APAR at the Hyyti€al€a forest (FI-Hyy, Finland) from September 6, 2014 to July 31, 2017: (a) SIF and GPP; (b) environmental scalars and APAR.
A Global, 0.05-Degree Product of Solar-Induced Chlorophyll Fluorescence Derived from OCO-2, MODIS, and Reanalysis Data
Fig. 1. Examples of producing 1◦, 8-day solar-induced chlorophyll fluorescence (SIF) maps from Orbiting Carbon Observatory-2 (OCO-2) soundings: (a) By Nadir mode in 9–16 January 2015; (b) by all modes in 9–16 January 2015; (c) by Nadir mode in 9–16 July 2015; and (d) by all modes in 9–16 July 2015.
Fig. 4. The validation of the predictive SIF model: Scatterplot of observed OCO-2 SIF versus predicted SIF in 2017. The dashed line is the 1:1 line, and the solid line is the regression line.
Fig. 6. Spatial patterns of 8-day global OCO-2 SIF (GOSIF) from January through December in 2016. The units are W m-2 µm-1 sr-1. For each month, the second 8-day SIF map is shown here.
Fig. 10. Annual mean and maximum SIF of our GOSIF product (0.05◦, 8-day) and comparison with annual or maximum GPP of the Moderate Resolution Imaging Spectroradiometer (MODIS) GPP product and the annual mean/maximum SIF of the 1◦ OCO-2 SIF directly aggregated from discrete OCO-2 SIF soundings in 2015: (a) Annual mean new 0.05◦ SIF, (b) maximum daily new 0.05◦ SIF, (c) annual MODIS GPP, (d) maximum daily MODIS GPP, (e) annual mean 1◦ SIF, and (f) maximum daily 1◦ SIF.
Applications on GOSIF
Applications on GOSIF
A global, fine-resolution dataset of gross primary production
Global climatic controls on interannual variability of ecosystem productivity
The responses of ecosystem productivity to drought
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