EcoDrive: Unravel the changing contributions of abiotic vs. biotic drivers of ecosystem gas exchange under weather extremes
Context
Extreme weather events (e.g. droughts, heat waves, very mild winters) and long-term climatic change will substantially affect carbon dioxide (CO2) and water (H2O) exchange of terrestrial ecosystems. Altered interactions and feedbacks at the land-atmosphere interface are the consequence. Process-based models provide coarse insights in ecosystem functioning based on our understanding of its abiotic and biotic drivers. This understanding relies on two complementary techniques: (1) the eddy covariance method which is the only available technique to actually measure CO2 and H2O exchange dynamics at high temporal resolution along with abiotic drivers in situ at ecosystem level; and (2) remote sensing, providing complementary temporal snapshot information on biotic drivers at larger spatial scales.
Our project will contribute to the external page COST Action SENSECO.
Project aims
We hypothesize that analysing extreme events with a multi-data approach will gain mechanistic understanding on spatio-temporal contributions of abiotic vs. biotic drivers for ecosystem gas exchange under changing weather and climate. The evaluation of this hypothesis is based on three questions:
- How does the impact of abiotic vs. biotic drivers on ecosystem gas exchange change under extreme compared to current conditions?
- Does an integrated multi-data approach allow scaling in situ gas exchange measurements and reliably representing ecosystem gas exchange under extreme conditions?
- What are observational requirements and resulting uncertainties of such a multi-data approach?
We address these questions with multi-sensor data at three well-instrumented Swiss ecosystems (i.e. mixed forest (Lägeren), coniferous forest (Davos), arable system (Oensingen)).
Publications
Gharun M, Shekhar A, Hörtnagl L, Krebs L, Arriga N, Migliavacca M, Roland M, Gielen B, Montagnani L, Tomelleri E, Šigut L, Peichl M, Zhao P, Schmidt M, Grünwald T, Korkiakoski M, Lohila A, Buchmann N (2025) Impact of winter warming on CO2 fluxes in evergreen needle-leaf forests. Biogeoscienes (accepted)
Shekhar A, Hörtnagl L, Paul-Limoges E, Etzold S, Zweifel R, Buchmann N, Gharun M (2024) Contrasting impact of extreme soil and atmospheric dryness on the functioning of trees and forests. Science of the Total Environment 916: 169931, doi: external page 10.1016/j.scitotenv.2024.169931
Shekhar A, Buchmann N, Humphrey V, Gharun M (2024) More than three-fold increase in compound soil and air dryness across Europe by the end of 21st century. Weather and Climate Extremes 44: 100666, doi: external page 10.1016/j.wace.2024.100666
Scapucci L, Shekhar A, Aranda-Barranco S, Bolshakova A, Hörtnagl L, Gharun M, Buchmann N (2024) Compound soil and atmospheric drought (CSAD) events and CO2 fluxes of a mixed deciduous forest: the occurrence, impact, and temporal contribution of main drivers. Biogeosciences 21: 3571-3592, doi: external page 10.5194/bg-21-3571-2024
Scapucci L, Shekhar A, Aranda-Barranco S, Bolshakova A, Hörtnagl L, Gharun M, Buchmann N (2024) Compound soil and atmospheric drought events and CO2 fluxes of a mixed deciduous forest: Occurrence, impact, and temporal contribution of main drivers. EGUspere [preprint], doi: external page 10.5194/egusphere-2024-459
Jordan E, Shekhar A, Gharun M (2024) Assessing the volatility of daily maximum temperature across Germany between 1990 and 2022. Atmosphere 15: 838, doi: external page 10.3390/atmos15070838
Gou R, Chi J, Liu J, Luo Y, Shekhar A, Mo L, Lin G (2024) Atmospheric water demand constrains net ecosystem production in subtropical mangrove forests. Journal of Hydrology 630: 130651, doi: external page 10.1016/j.jhydrol.2024.130651
Gharun M, Shekhar A, Hörtnagl L, Krebs L, Arriga N, Migliavacca M, Roland M, Gielen B, Montagnani L, Tomelleri E, Šigut L, Peichl M, Zhao P, Schmidt M, Grünwald T, Korkiakoski M, Lohila A, Buchmann N (2024) Divergent responses of evergreen needle-leaf forests in Europe to the 2020 warm winter. EGUsphere [preprint], doi: external page 10.5194/egusphere-2023-2964
Gharun M, Shekhar A, Xiao J, Li X, Buchmann N (2024) Effect of the 2022 summer drought across forest types in Europe. Biogeosciences 21: 5481-5494, doi: external page 10.5194/bg-21-5481-2024
Gharun M, Shekhar A, Xiao J, Li X, Buchmann N (2024) Effect of the 2022 summer drought across forest types in Europe. EGUspere [preprint], doi: external page 10.5194/egusphere-2024-423
Shekhar A, Hörtnagl L, Buchmann N, Gharun M (2023) Long-term changes in forest response to extreme atmospheric dryness. Global Change Biology 29: 5379-5396, doi: external page 10.1111/gcb.16846
Shekhar A, Buchmann N, Gharun M (2022) How well do recently reconstructed solar-induced fluorescence datasets model gross primary productivity? Remote Sensing of Environment 283: 113282, doi: external page 10.1016/j.rse.2022.113282