EGU2020-10458, updated on 12 Jun 2020
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Water Constraint is Limiting Global Gross Primary Productivity

Nima Madani1, Nicholas Parazoo1, John Kimball2, Ashley Ballantyne2, Marco Maneta2, Sassan Saatchi1, Paul Palmer3, Zhihua Liu2, and Torbern Tagesson4
Nima Madani et al.
  • 1Jet Propulsion Laboratory, United States of America (
  • 2University of Montana
  • 3University of Edinburgh
  • 4Lund University


We use a light use efficiency model (LUE)  to describe gross primary productivity (GPP) from 1982 to 2016 using the GIMMS-3g FPAR record and NASA MERRA-2 reanalysis, and explore how GPP trends and anomalies can be explained using annual changes in temperature and hydrology. The GPP model uses optimum LUE (LUEopt) inferred from the global FLUXNET network and extrapolated using solar induced chlorophyll fluorescence observations. We find that increasing trends in GPP at mid to high latitudes over the 35-year study period are due to reduced cold temperature of plant growth constraints. Our results suggest a persistent and increasing negative carbon-climate feedback at mid to high latitudes. We also find an increasing atmospheric vapor pressure deficit trends over the tropics, which represents an emerging positive climate feedback that results in a negative trend in GPP after the early 2000s. We expect that further warming, increasing water constraints, and disturbance events will significantly reduce global ecosystem productivity.

How to cite: Madani, N., Parazoo, N., Kimball, J., Ballantyne, A., Maneta, M., Saatchi, S., Palmer, P., Liu, Z., and Tagesson, T.: Water Constraint is Limiting Global Gross Primary Productivity, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-10458,, 2020

This abstract will not be presented.