Microclimate temperature variations from boreal forests to the tundra

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Aalto , J , Tyystjärvi , V , Niittynen , P O , Kemppinen , J , Rissanen , T K , Gregow , H & Luoto , M 2022 , ' Microclimate temperature variations from boreal forests to the tundra ' , Agricultural and Forest Meteorology , vol. 323 , 109037 . https://doi.org/10.1016/j.agrformet.2022.109037

Title: Microclimate temperature variations from boreal forests to the tundra
Author: Aalto, Juha; Tyystjärvi, Vilna; Niittynen, Pekka Oskari; Kemppinen, J.; Rissanen, Tuuli Katariina; Gregow, Hilppa; Luoto, Miska
Contributor organization: BioGeoClimate Modelling Lab
Department of Geosciences and Geography
Helsinki Institute of Sustainability Science (HELSUS)
Date: 2022-08-15
Language: eng
Number of pages: 12
Belongs to series: Agricultural and Forest Meteorology
ISSN: 0168-1923
DOI: https://doi.org/10.1016/j.agrformet.2022.109037
URI: http://hdl.handle.net/10138/346136
Abstract: Microclimate varies greatly over short horizontal and vertical distances, and timescales. This multi-level heterogeneity influences terrestrial biodiversity and ecosystem functions by determining the ambient environment where organisms live in. Fine-scale heterogeneity in microclimate temperatures is driven by local topography, land and water cover, snow, and soil characteristics. However, their relative influence over boreal and tundra biomes and in different seasons, has not been comprehensively quantified. Here, we aim to (1) quantify temperature variations measured at three heights: soil (-6 cm), near-surface (15 cm) and air (150 cm), and (2) determine the relative influence of the environmental variables in driving thermal variability. We measured temperature at 446 sites within seven focus areas covering large macroclimatic, topographic, and ecosystem gradients (tundra, mires, forests) of northern Europe. Our data, consisting of over 60 million temperature readings during the study period of 2019/11-2020/10, reveal substantial thermal variability within and across the focus areas. Near-surface temperatures in the tundra showed the greatest instantaneous differences within a given focus area (32.3 degrees C) while the corresponding differences for soil temperatures ranged from 10.0 degrees C (middle boreal forest) to 27.1 degrees C (tundra). Instantaneous differences in wintertime air temperatures were the largest in the tundra (up to 25.6 degrees C, median 4.2 degrees C), while in summer the differences were largest in the southern boreal forest (13.1 degrees C, median 4.8 degrees C). Statistical analyses indicate that monthly-aggregated temperature variations in boreal forests are closely linked to water bodies, wetlands, and canopy cover, whereas in the tundra, variation was linked to elevation, topographic solar radiation, and snow cover. The results provide new understanding on the magnitude of microclimate temperature variability and its seasonal drivers and will help to project local impacts of climate change on boreal forest and tundra ecosystems.
Subject: Surface temperature
Soil temperature
Air temperature
Thermal heterogeneity
1171 Geosciences
1172 Environmental sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion
Funder: Valtion perusrahoitus/hankkeet
Grant number:

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