2020
DOI: 10.1029/2020jg005774
|View full text |Cite
|
Sign up to set email alerts
|

The Response of Spectral Vegetation Indices and Solar‐Induced Fluorescence to Changes in Illumination Intensity and Geometry in the Days Surrounding the 2017 North American Solar Eclipse

Abstract: Remote sensing is a key method for advancing our understanding of global photosynthesis and is thus critical to understanding terrestrial carbon uptake and climate change. Increasingly sophisticated spectral indices including solar-induced florescence (SIF) and the photochemical reflectance index (PRI) are considered good proxies of canopy structure, biochemistry, and physiology. However, the relative influences of illumination intensity and angle on these measures are difficult to unravel, particularly at the… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
1
1

Citation Types

0
2
0

Year Published

2021
2021
2022
2022

Publication Types

Select...
3

Relationship

0
3

Authors

Journals

citations
Cited by 3 publications
(2 citation statements)
references
References 78 publications
0
2
0
Order By: Relevance
“…Therefore, the effects of SZA on CI were not considered in this study. Moreover, the solar‐target‐viewing geometry effects on SIF due to varying SZA were also not considered because the angular effects are minimal under the cloudy conditions (Rogers et al., 2020). normalCnormalI=1Rd/Rg $\mathrm{C}\mathrm{I}=1-{R}_{\mathrm{d}}/{R}_{\mathrm{g}}$ …”
Section: Methodsmentioning
confidence: 99%
“…Therefore, the effects of SZA on CI were not considered in this study. Moreover, the solar‐target‐viewing geometry effects on SIF due to varying SZA were also not considered because the angular effects are minimal under the cloudy conditions (Rogers et al., 2020). normalCnormalI=1Rd/Rg $\mathrm{C}\mathrm{I}=1-{R}_{\mathrm{d}}/{R}_{\mathrm{g}}$ …”
Section: Methodsmentioning
confidence: 99%
“…Especially, top‐of‐canopy (TOC) SIF emission only accounts for a fraction of total emitted SIF photons from leaves, due to multiple scattering and reabsorption processes within the canopy (Porcar‐Castell et al, 2014). Consequently, TOC observations of SIF is subject to the pronounced bidirectional anisotropic effects (Biriukova et al, 2020; Liu et al, 2016; Rogers et al, 2020; Tol et al, 2009), which is affected by vegetation biochemistry (e.g., chlorophyll content [Cab]), plant canopy structure (e.g., leaf area index [LAI], leaf angle distribution [LAD]; Dechant et al, 2020; Migliavacca et al, 2017), and illumination‐viewing geometries (i.e., sun and sensor angles; Guanter et al, 2012; Liu et al, 2016). The directional effects of SIF are generally quantified explicitly by an escape ratio f esc , which represents the ratio of observed SIF photons escaping from the canopy to all SIF photons emitted from all leaves.…”
Section: Introductionmentioning
confidence: 99%