Daily carbon dioxide fluxes in Arctic tundra and forest-tundra ecosystems in response to temperature and precipitation extremes

Gorbarenko, E.; Gushchina, D.; Tarasova, M.; Zheleznova, I.; Emelianova, E.; Gibadullin, R.; Osipov, A.; Olchev, A.

Авторы: Gorbarenko Elizaveta, Gushchina Daria, Tarasova Maria, Zheleznova Irina, Emelianova Ekaterina, Gibadullin Ravil, Osipov Alexander, Olchev Alexander
Журнал: Environmental Research Communications
Том: 7
Номер: 5
Год издания: 2025
Издательство: IOP Publishing
Местоположение издательства: [Bristol, UK], England
Номер статьи: 055022
DOI: 10.1088/2515-7620/add85e
Аннотация: The development and functioning of landscapes in different regions of the world, especially at polar latitudes, may be significantly affected by the increased frequency of extreme weather events associated with modern climate change. These events can affect regional biogeochemical cycles, including water, carbon and nitrogen cycles, with serious implications for ecosystem functioning and canopy production. The main objective of this study is to assess the spatial variability in the response of daily net ecosystem CO2 exchange (NEE) of Northern Hemisphere tundra and forest-tundra landscapes to anomalous temperature and precipitation events during the growing season. These landscape types are considered to be among the most vulnerable to changes in environmental conditions under a changing climate. For our data analysis, we use meteorological and CO2 flux data from the global FLUXNET and regional AmeriFlux networks, as well as the ERA5 reanalysis dataset. Analysis of CO2 flux anomalies in tundra and forest-tundra ecosystems revealed a wide range of observed NEE responses to anomalous temperature and precipitation events during the growing season, depending on geographic location and landscape type. In contrast to most previous studies, the stressed CO2 uptake and higher CO2 emissions under anomalously high temperatures were mostly detected at the southern boundary of the polar region, where heat waves are more frequent. Prevailing CO2 uptake during anomalously high temperature days was found in deciduous broadleaf forests and open shrublands. The effect of anomalously low temperature is manifested by an increase in CO2 emissions. The response of CO2 fluxes to anomalously high and low precipitation is quite similar regardless of the time scale (short-term or long-term response). In most tundra and forest-tundra ecosystems, heavy precipitation typically results in increased CO2 emissions to the atmosphere. The prolonged precipitation deficit is accompanied by a prevailing CO2 uptake.
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Daily carbon dioxide fluxes in Arctic tundra and forest-tundra ecosystems in response to temperature and precipitation extremesстатья

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