The influence of plant water stress on vegetation–atmosphere exchanges: implications for ozone modelling

Abstract CO 2 assimilation. The stress factors depend on either soil moisture or leaf water potential, which act on photosynthetic activity, and mesophyll and stomatal conductance. The new functionalities reduce the initial overestimation of evapotranspiration in the model globally by more than an order of magnitude, which is most important in the Southern Hemisphere. The intensity of simulated warm spells over continents is significantly improved. For ozone, we find that a realistic model representation of plant water stress suppresses uptake by vegetation and enhances photochemical production in the troposphere. These effects lead to an overall increase in simulated ground-level ozone, which is most pronounced in the Southern Hemisphere over the continents. More sophisticated land surface models with multi-layer soil schemes could address the uncertainties in representing plant dynamics representation due to too-shallow roots. In regions with low evaporative loss, the representation of precipitation remains the largest uncertainty.

Object Details

• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch

References and Relationships

• Bibliographic citation: The influence of plant water stress on vegetation–atmosphere exchanges: implications for ozone modelling ; volume:21 ; number:14 ; year:2024 ; pages:3251-3269 ; extent:19 ; Biogeosciences ; 21, Heft 14 (2024), 3251-3269 (gesamt 19)

Contributors, Places and Time

• Creator: Emmerichs, Tamara ; Lu, Yen-Sen ; Taraborrelli, Domenico

Further information

• DOI: 10.5194/bg-21-3251-2024
• URN: urn:nbn:de:101:1-2408061218148.488412457856
• Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 14.08.2025, 10:53 AM CEST