Daily carbon dioxide fluxes in Arctic tundra and forest-tundra ecosystems in response to temperature and precipitation extremes
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 influence regional biogeochemical cycles, includi...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2025-01-01
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| Series: | Environmental Research Communications |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2515-7620/add85e |
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| Summary: | 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 influence 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 CO _2 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 CO _2 flux data from the global FLUXNET and regional AmeriFlux networks, as well as the ERA5 reanalysis dataset. Analysis of CO _2 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 CO _2 uptake and higher CO _2 emissions under anomalously high temperatures were mostly detected at the southern boundary of the polar region, where heat waves are more frequent. Prevailing CO _2 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 CO _2 emissions. The response of CO _2 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 CO _2 emissions to the atmosphere. The prolonged precipitation deficit is accompanied by a prevailing CO _2 uptake. |
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| ISSN: | 2515-7620 |