Tarmo Virtanen
Biographic Data
| ID | 5810878 |
|---|---|
| NAME | Tarmo Virtanen |
| GIVEN NAMES | Tarmo |
| FAMILY NAME | Virtanen |
| SIGNATURE | VIRTANEN T |
| AFFILIATIONS | University of Helsinki |
| ORCID | 0000-0001-8660-2464 |
| VERIFIED | Yes |
| TOTAL WORKS | 8 |
| TOTAL CITATIONS | 15 |
| WORKS AS AUTHOR | 8 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 2002 |
| LATEST PUBLICATION YEAR | 2025 |
| H-INDEX | 3 |
Reconstructing the historical decline of lichen cover across the reindeer fence of the Finnish–Norwegian border
We analysed the history behind the current contrasting lichen covers of two adjacent reindeer herding districts at the Finnish–Norwegian border. We conducted vegetation field inventories across the border fence and reconstructed a lichen cover history from 1959 to 2020 using aerial and satellite images. The oldest images showed only a slight difference in lichen cover between the different sides of the border fence. Since the late 1950s, lichen c…
Spatial variation and seasonal dynamics of leaf-area index in the arctic tundra-implications for linking ground observations and satellite images
Vegetation in the arctic tundra typically consists of a small-scale mosaic of plant communities, with species differing in growth forms, seasonality, and biogeochemical properties. Characterization of this variation is essential for understanding and modeling the functioning of the arctic tundra in global carbon cycling, as well as for evaluating the resolution requirements for remote sensing. Our objective was to quantify the seasonal developmen…
Biomass offsets little or none of permafrost carbon release from soils, streams, and wildfire
As the permafrost region warms, its large organic carbon pool will be increasingly vulnerable to decomposition, combustion, and hydrologic export. Models predict that some portion of this release will be offset by increased production of Arctic and boreal biomass; however, the lack of robust estimates of net carbon balance increases the risk of further overshooting international emissions targets. Precise empirical or model-based assessments of t…
Land cover change on the Isthmus of Karelia 1939–2005
Postglacial spatiotemporal peatland initiation and lateral expansion dynamics in North America and northern Europe
Peatlands are major ecosystems of the Northern Hemisphere and have a significant role in global biogeochemical processes. Consequently, there is growing interest in understanding past, present and future peatland dynamics. However, chronological and geographical data on peatland initiation are scattered, impeding the reliable establishment of postglacial spatiotemporal peatland formation patterns and their possible connection to climate. In order…
Past changes in the Scots pine forest line and climate in Finnish Lapland
Subfossil samples of Scots pine (Pinus sylvestris) and evidence of pine stomata and pollen accumulation rates from previously studied lakes located beyond the present pine forest line in Finnish Lapland were used to reconstruct the extent of the past forest line and the corresponding minimum shift in mean July temperatures, compared with the present. The location of the present pine forest line follows the c. + 12.2C mean July temperature isoline…
Perceived and Measured Levels of Environmental Pollution
Using interdisciplinary field research in the Usa Basin, northeast European Russia, we compared local inhabitants' perception of environmental problems with chemical and remote-sensing signatures of environmental pollution and their local impacts. Extensive coal mining since the 1930s around Inta and Vorkuta has left a legacy of pollution, detected by measuring snowpack, topsoil, and lichen chemistry, together with remote-sensing techniques and a…
Upscaling soil organic carbon estimates for the Usa Basin (Northeast European Russia) using GIS-based landcover and soil classification schemes
This study provides estimates of average soil organic carbon content for the Usa Basin in Northeast European Russia, using two independent databases and two separate upscaling tools. The results are very similar despite differences in sample size and spatial resolution. Based on the merged databases and landcover upscaling, the average carbon content in the Usa Basin is 10,7 Kg Cm−2 for the upper 30 cm soil layer, 25,5 Kg Cm−2 for a reference 1 m…
Postglacial spatiotemporal peatland initiation and lateral expansion dynamics in North America and northern Europe
Peatlands are major ecosystems of the Northern Hemisphere and have a significant role in global biogeochemical processes. Consequently, there is growing interest in understanding past, present and future peatland dynamics. However, chronological and geographical data on peatland initiation are scattered, impeding the reliable establishment of postglacial spatiotemporal peatland formation patterns and their possible connection to climate. In order…
Past changes in the Scots pine forest line and climate in Finnish Lapland
Subfossil samples of Scots pine (Pinus sylvestris) and evidence of pine stomata and pollen accumulation rates from previously studied lakes located beyond the present pine forest line in Finnish Lapland were used to reconstruct the extent of the past forest line and the corresponding minimum shift in mean July temperatures, compared with the present. The location of the present pine forest line follows the c. + 12.2C mean July temperature isoline…
Land cover change on the Isthmus of Karelia 1939–2005
Perceived and Measured Levels of Environmental Pollution
Using interdisciplinary field research in the Usa Basin, northeast European Russia, we compared local inhabitants' perception of environmental problems with chemical and remote-sensing signatures of environmental pollution and their local impacts. Extensive coal mining since the 1930s around Inta and Vorkuta has left a legacy of pollution, detected by measuring snowpack, topsoil, and lichen chemistry, together with remote-sensing techniques and a…
Upscaling soil organic carbon estimates for the Usa Basin (Northeast European Russia) using GIS-based landcover and soil classification schemes
This study provides estimates of average soil organic carbon content for the Usa Basin in Northeast European Russia, using two independent databases and two separate upscaling tools. The results are very similar despite differences in sample size and spatial resolution. Based on the merged databases and landcover upscaling, the average carbon content in the Usa Basin is 10,7 Kg Cm−2 for the upper 30 cm soil layer, 25,5 Kg Cm−2 for a reference 1 m…
Upscaling soil organic carbon estimates for the Usa Basin (Northeast European Russia) using GIS-based landcover and soil classification schemes
This study provides estimates of average soil organic carbon content for the Usa Basin in Northeast European Russia, using two independent databases and two separate upscaling tools. The results are very similar despite differences in sample size and spatial resolution. Based on the merged databases and landcover upscaling, the average carbon content in the Usa Basin is 10,7 Kg Cm−2 for the upper 30 cm soil layer, 25,5 Kg Cm−2 for a reference 1 m…
Past changes in the Scots pine forest line and climate in Finnish Lapland
Subfossil samples of Scots pine (Pinus sylvestris) and evidence of pine stomata and pollen accumulation rates from previously studied lakes located beyond the present pine forest line in Finnish Lapland were used to reconstruct the extent of the past forest line and the corresponding minimum shift in mean July temperatures, compared with the present. The location of the present pine forest line follows the c. + 12.2C mean July temperature isoline…
Perceived and Measured Levels of Environmental Pollution
Using interdisciplinary field research in the Usa Basin, northeast European Russia, we compared local inhabitants' perception of environmental problems with chemical and remote-sensing signatures of environmental pollution and their local impacts. Extensive coal mining since the 1930s around Inta and Vorkuta has left a legacy of pollution, detected by measuring snowpack, topsoil, and lichen chemistry, together with remote-sensing techniques and a…
Postglacial spatiotemporal peatland initiation and lateral expansion dynamics in North America and northern Europe
Peatlands are major ecosystems of the Northern Hemisphere and have a significant role in global biogeochemical processes. Consequently, there is growing interest in understanding past, present and future peatland dynamics. However, chronological and geographical data on peatland initiation are scattered, impeding the reliable establishment of postglacial spatiotemporal peatland formation patterns and their possible connection to climate. In order…
Land cover change on the Isthmus of Karelia 1939–2005
Biomass offsets little or none of permafrost carbon release from soils, streams, and wildfire
As the permafrost region warms, its large organic carbon pool will be increasingly vulnerable to decomposition, combustion, and hydrologic export. Models predict that some portion of this release will be offset by increased production of Arctic and boreal biomass; however, the lack of robust estimates of net carbon balance increases the risk of further overshooting international emissions targets. Precise empirical or model-based assessments of t…
Spatial variation and seasonal dynamics of leaf-area index in the arctic tundra-implications for linking ground observations and satellite images
Vegetation in the arctic tundra typically consists of a small-scale mosaic of plant communities, with species differing in growth forms, seasonality, and biogeochemical properties. Characterization of this variation is essential for understanding and modeling the functioning of the arctic tundra in global carbon cycling, as well as for evaluating the resolution requirements for remote sensing. Our objective was to quantify the seasonal developmen…
Reconstructing the historical decline of lichen cover across the reindeer fence of the Finnish–Norwegian border
We analysed the history behind the current contrasting lichen covers of two adjacent reindeer herding districts at the Finnish–Norwegian border. We conducted vegetation field inventories across the border fence and reconstructed a lichen cover history from 1959 to 2020 using aerial and satellite images. The oldest images showed only a slight difference in lichen cover between the different sides of the border fence. Since the late 1950s, lichen c…
Geography (8 works) · Physical geography (7 works) · Climate change and permafrost (6 works) · Ecology (6 works) · Environmental Science (5 works) · Forestry (4 works) · Geology (4 works) · Geology and Paleoclimatology Research (4 works) · Archaeology (3 works) · Ecology (3 works)