Understanding the non-linearity between fluorescence and photochemistry in evergreen needleleaf forests

May 04, 2020

Recent advancements in understanding remotely sensed solar‐induced chlorophyll fluorescence often suggest a linear relationship with gross primary productivity at large spatial scales. However, the quantum yields of fluorescence and photochemistry are not linearly related, and this relationship is largely driven by irradiance. This raises questions about the mechanistic basis of observed linearity from complex canopies that experience heterogeneous irradiance regimes at subcanopy scales.

Paper accepted using solar-induced fluorescence to estimate crop productivity

March 17, 2020

● The photosynthetic pathway (C3, C4) impacts the relationship between CO2 uptake and SIF, which helps to interpret satellite signals.

● TROPOMI SIF agrees well with the seasonality of crop gross primary production (GPP) when accounting for C3/C4 fractionation.

● TROPOMI SIF is highly correlated with USDA reported crop productivity at the county scale.

New paper on harmonizing multiple satellite interments for high resolution, long-term solar-induced fluorescence

January 31, 2020

Wen, J., Köhler, P., Duveiller, G., Parazoo, N. C., Magney, T. S., Hooker, G., … Sun, Y. (2020). A framework for harmonizing multiple satellite instruments to generate a long-term global high spatial-resolution solar-induced chlorophyll fluorescence (SIF). Remote Sensing of Environment239(August 2019). https://doi.org/10.1016/j.rse.2020.111644

Mapping tundra vegetation communities provides an ecological baseline for important research areas in a changing Arctic environment

November 21, 2019

 Greaves, H., Eitel, J.U.H., Vierling, L., Boelman, N., Griffin, K., Magney, T.S., Prager, C.M. 2019. 20 cm resolution mapping of tundra vegetation communities provides an ecological baseline for important research areas in a changing Arctic environment. Environmental Research Communications. 1 (10), 105004. 

https://iopscience.iop.org/article/10.1088/2515-7620/ab4a85/pdf

A dry-season increase in photosynthesis as observed from space in the Amazon rainforest

November 21, 2019
A dry-season increase in photosynthesis as observed from space in the Amazon rainforest

 Doughty, R., Kophler, P., Frankenberg, C., Magney, T.S., Xiao, X., Qin, Y. Wu., X., Moore, B. 2019. TROPOMI reveals dry-season increase of solar-induced chlorophyll fluorescence in the Amazon forest. Proceedings of the National Academy of Sciences. 116 (44), 22393-22398. 

https://www.pnas.org/content/116/44/22393