Warning message

Member access has been temporarily disabled. Please try again later.
The ATom website is undergoing a major upgrade that began Friday, October 11th at 5:00 PM PDT. The new upgraded site will be available no later than Monday, October 21st. Until that time, the current site will be visible but logins are disabled.

Tundra photosynthesis captured by satellite-observed solar-induced chlorophyll...

Luus, K. A., R. Commane, N. Parazoo, J. Benmergui, E. S. Euskirchen, C. Frankenberg, J. Joiner, J. Lindaas, C. E. Miller, W. C. Oechel, D. Zona, S. C. Wofsy, and J. C. Lin (2017), Tundra photosynthesis captured by satellite-observed solar-induced chlorophyll fluorescence, Geophys. Res. Lett., 44, 1564-1573, doi:10.1002/2016GL070842.
Abstract: 

Accurately quantifying the timing and magnitude of respiration and photosynthesis by high-latitude ecosystems is important for understanding how a warming climate influences global carbon cycling. Data-driven estimates of photosynthesis across Arctic regions often rely on satellite-derived enhanced vegetation index (EVI); we find that satellite observations of solar-induced chlorophyll fluorescence (SIF) provide a more direct proxy for photosynthesis. We model Alaskan tundra CO2 cycling (2012–2014) according to temperature and shortwave radiation and alternately input EVI or SIF to prescribe the annual seasonal cycle of photosynthesis. We find that EVI-based seasonality indicates spring “green-up” to occur 9 days prior to SIF-based estimates, and that SIF-based estimates agree with aircraft and tower measurements of CO2 . Adopting SIF, instead of EVI, for modeling the seasonal cycle of tundra photosynthesis can result in more accurate estimates of growing season duration and net carbon uptake by arctic vegetation.

PDF of Publication: 
Download from publisher's website.
Mission: 
Orbiting Carbon Observatory-2 (OCO-2)