A practical approach for estimating the escape ratio of near-infrared solar-induced chlorophyll fluorescence

Zeng, Yelu; Badgley, Grayson; Dechant, Benjamin; Ryu, Youngryel; Chen, Min

doi:10.31223/osf.io/3w9nz

Cited by 34 publications

(67 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the directional SIF observed by a satellite sensor (SIF obs ) at the top of a canopy represents only a portion of the total SIF emission from all leaves (SIF total ) within the canopy. As expected based on its definition, SIF total is insensitive to both canopy structural and angular effects (Yang & van der Tol, ; Zeng et al, ). The varying observational directions of the TROPOMI SIF over its wide swath of approximately 2,600 km (Köhler, Frankenberg, et al, ) can introduce uncertainties in the use of SIF obs as a proxy of the whole‐canopy GPP (He et al, ).…”

Section: Introductionsupporting

confidence: 55%

From Canopy‐Leaving to Total Canopy Far‐Red Fluorescence Emission for Remote Sensing of Photosynthesis: First Results From TROPOMI

Zhang

Chen

Guanter

et al. 2019

Geophysical Research Letters

View full text Add to dashboard Cite

Solar‐induced chlorophyll fluorescence (SIF) from the TROPOspheric Monitoring Instrument (TROPOMI), which has substantially improved spatial and temporal resolutions, will improve the global estimations of gross primary production (GPP) than previous satellite SIF data. However, the canopy‐leaving SIF observed by sensors (SIFobs) represents only a portion of the total canopy SIF emission (SIFtotal). This portion is sensitive to the canopy structure and observation direction, resulting in uncertainties in GPP estimations using SIFobs. Here we used the spectral invariant theory to derive global soil‐resistant SIFtotal (SIFtotal‐SR) from TROPOMI SIFobs and evaluated the SIFtotal‐SR performance in estimating GPP. We found that the clear differences in SIFobs between needleleaf forest and crops diminished for SIFtotal‐SR. SIFtotal‐SR increased the coefficient of determination (R2) by 0.09 and 0.11 against the flux tower instantaneous and daily GPP, respectively. This derived SIFtotal‐SR can be used to develop more robust GPP models and better constrain carbon cycle models.

show abstract

Section: Introductionsupporting

confidence: 55%

From Canopy‐Leaving to Total Canopy Far‐Red Fluorescence Emission for Remote Sensing of Photosynthesis: First Results From TROPOMI

Zhang

Chen

Guanter

et al. 2019

Geophysical Research Letters

View full text Add to dashboard Cite

show abstract

“…We have used the remote sensing product of NIRv, which, unlike SIF, is not a direct measure of photosynthetic activity but bears a close relationship to it [ 69 , 70 ]. NIRv has proven previously [ 17 , 33 ] to correlate more strongly with GPP from eddy-covariance data, and does again in our analyses both during the drought and during the climatological period before.…”

Section: Discussionmentioning

confidence: 99%

Spring enhancement and summer reduction in carbon uptake during the 2018 drought in northwestern Europe

Smith

Kooijmans

Koren

et al. 2020

Phil. Trans. R. Soc. B

View full text Add to dashboard Cite

We analysed gross primary productivity (GPP), total ecosystem respiration (TER) and the resulting net ecosystem exchange (NEE) of carbon dioxide (CO 2 ) by the terrestrial biosphere during the summer of 2018 through observed changes across the Integrated Carbon Observation System (ICOS) network, through biosphere and inverse modelling, and through remote sensing. Highly correlated yet independently-derived reductions in productivity from sun-induced fluorescence, vegetative near-infrared reflectance, and GPP simulated by the Simple Biosphere model version 4 (SiB4) suggest a 130–340 TgC GPP reduction in July–August–September (JAS) of 2018. This occurs over an area of 1.6 × 10 6 km 2 with anomalously low precipitation in northwestern and central Europe. In this drought-affected area, reduced GPP, TER, NEE and soil moisture at ICOS ecosystem sites are reproduced satisfactorily by the SiB4 model. We found that, in contrast to the preceding 5 years, low soil moisture is the main stress factor across the affected area. SiB4’s NEE reduction by 57 TgC for JAS coincides with anomalously high atmospheric CO 2 observations in 2018, and this is closely matched by the NEE anomaly derived by CarbonTracker Europe (52 to 83 TgC). Increased NEE during the spring (May–June) of 2018 (SiB4 −52 TgC; CTE −46 to −55 TgC) largely offset this loss, as ecosystems took advantage of favourable growth conditions. This article is part of the theme issue ‘Impacts of the 2018 severe drought and heatwave in Europe: from site to continental scale’.

show abstract

“…Studies will be conducted to further explore how canopy structure, physiology, and environmental conditions interact and drive the variations in LUE, SIF y , and LUE:SIF y relationship. The apparent SIF y contains the escape ratio that is related to canopy structure (Zeng et al, ). LUE, SIF y and the LUE:SIF y relationship could also be affected by canopy structure.…”

Section: Discussionmentioning

confidence: 99%

Varying Contributions of Drivers to the Relationship Between Canopy Photosynthesis and Far‐Red Sun‐Induced Fluorescence for Two Maize Sites at Different Temporal Scales

et al. 2020

View full text Add to dashboard Cite

Sun‐induced fluorescence (SIF) has been found to be strongly correlated with gross primary production (GPP) in a quasi‐linear pattern at the scales beyond leaves. However, the causes of the GPP:SIF relationship deviating from a linear pattern remain unclear. In the current study conducted at two maize sites in Nebraska in 2017 summer growing season, we investigated the relationship between GPP and SIF at 760 nm (F760) at two temporal scales and quantified the contributions of incoming photosynthetically active radiation (PARin), fraction of absorbed PAR (fPAR), light use efficiency (LUE), and F760 yield (F760,y, defined as F760/(PARin×fPAR)) to GPP and F760 variabilities to further understand the linearity and deviations in the GPP:F760 relationship. We found the following: (1) For individual growth stages when canopy structure and chlorophyll content were stable, GPP and F760 were strongly controlled by PARin, while LUE and F760,y had much lower contributions to the GPP:F760 relationship; during this period, LUE and F760,y had either a slightly negative or no clear relationship, which explained some deviations in the GPP:SIF relationship. (2) At the seasonal scale, the contribution of LUE to GPP variability as well as the contribution of F760,y to F760 variability increased and was comparable to the contribution of PARin; the LUE:F760,y relationship showed a strong linear relationship, which strengthened the linear GPP:F760 relationship. Both maize sites showed similar patterns. A framework was applied to estimate LUE at individual stages and as a result, significantly improved the GPP estimation, thus enhancing the SIF potential for inferring photosynthesis.

show abstract

A practical approach for estimating the escape ratio of near-infrared solar-induced chlorophyll fluorescence

Cited by 34 publications

References 34 publications

From Canopy‐Leaving to Total Canopy Far‐Red Fluorescence Emission for Remote Sensing of Photosynthesis: First Results From TROPOMI

From Canopy‐Leaving to Total Canopy Far‐Red Fluorescence Emission for Remote Sensing of Photosynthesis: First Results From TROPOMI

Spring enhancement and summer reduction in carbon uptake during the 2018 drought in northwestern Europe

Varying Contributions of Drivers to the Relationship Between Canopy Photosynthesis and Far‐Red Sun‐Induced Fluorescence for Two Maize Sites at Different Temporal Scales

Contact Info

Product

Resources

About