Publications by authors named "E Joetzjer"

The year 2022 saw record breaking temperatures in Europe during both summer and fall. Similar to the recent 2018 drought, close to 30% (3.0 million km) of the European continent was under severe summer drought.

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During the last two decades, inventory data show that droughts have reduced biomass carbon sink of the Amazon forest by causing mortality to exceed growth. However, process-based models have struggled to include drought-induced responses of growth and mortality and have not been evaluated against plot data. A process-based model, ORCHIDEE-CAN-NHA, including forest demography with tree cohorts, plant hydraulic architecture and drought-induced tree mortality, was applied over Amazonia rainforests forced by gridded climate fields and rising CO from 1901 to 2019.

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Article Synopsis
  • The 2015/16 El Niño caused severe drought and high temperatures, leading to significant reductions in above-ground biomass (AGB) in over 60% of affected intact forests.
  • In the central Amazon, AGB decline was delayed by one year, and by the end of 2019, only 40% of these forests had fully recovered to pre-drought AGB levels.
  • The study found that AGB loss and recovery were influenced by soil water conditions and forest canopy structure, with forests having a higher canopy ratio showing better recovery potential.
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In Europe, three widespread extreme summer drought and heat (DH) events have occurred in 2003, 2010 and 2018. These events were comparable in magnitude but varied in their geographical distribution and biomes affected. In this study, we perform a comparative analysis of the impact of the DH events on ecosystem CO fluxes over Europe based on an ensemble of 11 dynamic global vegetation models (DGVMs), and the observation-based FLUXCOM product.

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