Variability and drivers of winter near-surface temperatures over boreal and tundra landscapes
Winter near-surface air temperatures have important implications for ecosystem functioning such as vegetation dynamics and carbon cycling. In cold environments, the persistence of seasonal snow cover can exert a strong control on the near-surface temperatures. However, the lack of in situ measuremen...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/573039 2024-04-28T08:40:50+00:00 Variability and drivers of winter near-surface temperatures over boreal and tundra landscapes Tyystjärvi, Vilna Niittynen, Pekka Oskari Kemppinen, Julia Luoto, Miska Rissanen, Tuuli Katariina Aalto, Juha Department of Geosciences and Geography Helsinki Institute of Sustainability Science (HELSUS) BioGeoClimate Modelling Lab Organismal and Evolutionary Biology Research Programme 2024-03-13T07:27:04Z 21 application/pdf http://hdl.handle.net/10138/573039 eng eng COPERNICUS GESELLSCHAFT MBH 10.5194/tc-18-403-2024 This research has been supported by the Academy of Finland (grant nos. 350184, 342890, 347558, 349606,318930 and 337552) and the Helsingin Yliopisto (grant no.7510145). Tyystjärvi , V , Niittynen , P O , Kemppinen , J , Luoto , M , Rissanen , T K & Aalto , J 2024 , ' Variability and drivers of winter near-surface temperatures over boreal and tundra landscapes ' , Cryosphere , vol. 18 , no. 1 , pp. 403-423 . https://doi.org/10.5194/tc-18-403-2024 ORCID: /0000-0002-7290-029X/work/155648860 ORCID: /0000-0001-9912-4676/work/155648874 ORCID: /0000-0001-6819-4911/work/155650514 ORCID: /0000-0001-7521-7229/work/155651233 ORCID: /0000-0001-6203-5143/work/155659545 http://hdl.handle.net/10138/573039 c77c843e-8116-4d88-b165-427bf4b46f3d 85184078463 001168779900001 cc_by info:eu-repo/semantics/openAccess openAccess Accumulation Climate Dynamics Forest Manipulation Respiration Snow cover Soil-moisture Thermal-conductivity Topographic control 1171 Geosciences Article publishedVersion 2024 ftunivhelsihelda 2024-04-03T15:21:21Z Winter near-surface air temperatures have important implications for ecosystem functioning such as vegetation dynamics and carbon cycling. In cold environments, the persistence of seasonal snow cover can exert a strong control on the near-surface temperatures. However, the lack of in situ measurements of both snow cover duration and surface temperatures over high latitudes has made it difficult to estimate the spatio-temporal variability of this relationship. Here, we quantified the fine-scale variability of winter near-surface air temperatures (+2 cm) and snow cover duration (calculated from temperature time series) using a total of 441 microclimate loggers in seven study areas across boreal and tundra landscapes in Finland during 2019--2021. We further examined the drivers behind this variation using a structural equation model and the extent to which near-surface air temperatures are buffered from free-air temperatures during winter. Our results show that while average winter near-surface temperatures stay close to 0 \degree C across the study domain, there are large differences in their fine-scale variability among the study areas. Areas with large topographical variation, as well as areas with shallow snowpacks, showed the greatest variation in near-surface temperatures and in snow cover duration. In the tundra, for example, differences in minimum near-surface temperatures between study sites were close to 30 \degree C and topography was shown to be an important driver of this variability. In contrast, flat topography and long snow cover duration led to little spatial variation, and long periods of decoupling between near-surface and air temperatures. Quantifying and understanding the landscape-wide variation in winter microclimates improves our ability to predict the local effects of climate change in the rapidly warming boreal and tundra regions. Winter near-surface air temperatures have important implications for ecosystem functioning such as vegetation dynamics and carbon cycling. In cold ... Article in Journal/Newspaper Tundra HELDA – University of Helsinki Open Repository |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
Accumulation Climate Dynamics Forest Manipulation Respiration Snow cover Soil-moisture Thermal-conductivity Topographic control 1171 Geosciences |
spellingShingle |
Accumulation Climate Dynamics Forest Manipulation Respiration Snow cover Soil-moisture Thermal-conductivity Topographic control 1171 Geosciences Tyystjärvi, Vilna Niittynen, Pekka Oskari Kemppinen, Julia Luoto, Miska Rissanen, Tuuli Katariina Aalto, Juha Variability and drivers of winter near-surface temperatures over boreal and tundra landscapes |
topic_facet |
Accumulation Climate Dynamics Forest Manipulation Respiration Snow cover Soil-moisture Thermal-conductivity Topographic control 1171 Geosciences |
description |
Winter near-surface air temperatures have important implications for ecosystem functioning such as vegetation dynamics and carbon cycling. In cold environments, the persistence of seasonal snow cover can exert a strong control on the near-surface temperatures. However, the lack of in situ measurements of both snow cover duration and surface temperatures over high latitudes has made it difficult to estimate the spatio-temporal variability of this relationship. Here, we quantified the fine-scale variability of winter near-surface air temperatures (+2 cm) and snow cover duration (calculated from temperature time series) using a total of 441 microclimate loggers in seven study areas across boreal and tundra landscapes in Finland during 2019--2021. We further examined the drivers behind this variation using a structural equation model and the extent to which near-surface air temperatures are buffered from free-air temperatures during winter. Our results show that while average winter near-surface temperatures stay close to 0 \degree C across the study domain, there are large differences in their fine-scale variability among the study areas. Areas with large topographical variation, as well as areas with shallow snowpacks, showed the greatest variation in near-surface temperatures and in snow cover duration. In the tundra, for example, differences in minimum near-surface temperatures between study sites were close to 30 \degree C and topography was shown to be an important driver of this variability. In contrast, flat topography and long snow cover duration led to little spatial variation, and long periods of decoupling between near-surface and air temperatures. Quantifying and understanding the landscape-wide variation in winter microclimates improves our ability to predict the local effects of climate change in the rapidly warming boreal and tundra regions. Winter near-surface air temperatures have important implications for ecosystem functioning such as vegetation dynamics and carbon cycling. In cold ... |
author2 |
Department of Geosciences and Geography Helsinki Institute of Sustainability Science (HELSUS) BioGeoClimate Modelling Lab Organismal and Evolutionary Biology Research Programme |
format |
Article in Journal/Newspaper |
author |
Tyystjärvi, Vilna Niittynen, Pekka Oskari Kemppinen, Julia Luoto, Miska Rissanen, Tuuli Katariina Aalto, Juha |
author_facet |
Tyystjärvi, Vilna Niittynen, Pekka Oskari Kemppinen, Julia Luoto, Miska Rissanen, Tuuli Katariina Aalto, Juha |
author_sort |
Tyystjärvi, Vilna |
title |
Variability and drivers of winter near-surface temperatures over boreal and tundra landscapes |
title_short |
Variability and drivers of winter near-surface temperatures over boreal and tundra landscapes |
title_full |
Variability and drivers of winter near-surface temperatures over boreal and tundra landscapes |
title_fullStr |
Variability and drivers of winter near-surface temperatures over boreal and tundra landscapes |
title_full_unstemmed |
Variability and drivers of winter near-surface temperatures over boreal and tundra landscapes |
title_sort |
variability and drivers of winter near-surface temperatures over boreal and tundra landscapes |
publisher |
COPERNICUS GESELLSCHAFT MBH |
publishDate |
2024 |
url |
http://hdl.handle.net/10138/573039 |
genre |
Tundra |
genre_facet |
Tundra |
op_relation |
10.5194/tc-18-403-2024 This research has been supported by the Academy of Finland (grant nos. 350184, 342890, 347558, 349606,318930 and 337552) and the Helsingin Yliopisto (grant no.7510145). Tyystjärvi , V , Niittynen , P O , Kemppinen , J , Luoto , M , Rissanen , T K & Aalto , J 2024 , ' Variability and drivers of winter near-surface temperatures over boreal and tundra landscapes ' , Cryosphere , vol. 18 , no. 1 , pp. 403-423 . https://doi.org/10.5194/tc-18-403-2024 ORCID: /0000-0002-7290-029X/work/155648860 ORCID: /0000-0001-9912-4676/work/155648874 ORCID: /0000-0001-6819-4911/work/155650514 ORCID: /0000-0001-7521-7229/work/155651233 ORCID: /0000-0001-6203-5143/work/155659545 http://hdl.handle.net/10138/573039 c77c843e-8116-4d88-b165-427bf4b46f3d 85184078463 001168779900001 |
op_rights |
cc_by info:eu-repo/semantics/openAccess openAccess |
_version_ |
1797571341788905472 |