| Titre | Impacts of snow on soil temperature observed across the circumpolar north |
| Auteur | Zhang, Y; Sherstiukov, A B; Qian, B; Kokelj, S V; Lantz, T C |
| Source | Environmental Research Letters vol. 13, no. 4, 044012, 2018 p. 1-10, https://doi.org/10.1088/1748-9326/aab1e7 (Accès ouvert) |
| Année | 2018 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20181042 |
| Éditeur | IOP Publishing |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1088/1748-9326/aab1e7 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Province | Canada; Colombie-Britannique; Alberta; Saskatchewan; Manitoba; Ontario; Québec; Nouveau-Brunswick; Nouvelle-Écosse; Île-du-Prince-Édouard; Terre-Neuve-et-Labrador; Territoires du Nord-Ouest; Yukon;
Nunavut |
| SNRC | 1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65;
66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560 |
| Lat/Long OENS | -180.0000 180.0000 90.0000 40.0000 |
| Sujets | températures au sol; neige; effets climatiques; météorologie; temperature; pergélisol; glace fossile; trous de mine; sols; carbone organique; changement climatique; études nordiques; infrastructure;
effets cumulatifs; dégel du pergélisol; traitement des données; géologie des dépôts meubles/géomorphologie; pédologie; Nature et environnement; Sciences et technologie |
| Illustrations | sketch maps; plots; tables |
| Programme | Science de la télédétection spatiale, Caractérisation de la surface terrestre |
| Diffusé | 2018 04 03 |
| Résumé | (disponible en anglais seulement)
Climate warming has significant impacts on permafrost, infrastructure and soil organic carbon at the northern high latitudes. These impacts are mainly driven by
changes in soil temperature (TS). Snow insulation can cause significant differences between TS and air temperature (TA), and our understanding about this effect through space and time is currently limited. In this study, we compiled soil and air
temperature observations (measured at about 0.2 m depth and 2 m height, respectively) at 588 sites from climate stations and boreholes across the northern high latitudes. Analysis of this circumpolar dataset demonstrates the large offset between mean
TS and TA in the low arctic and northern boreal regions. The offset decreases both northward and southward due to changes in snow conditions. Correlation analysis shows that the coupling between annual TS and TA is weaker, and the response of annual
TS to changes in TA is smaller in boreal regions than in the arctic and the northern temperate regions. Consequently, the inter-annual variation and the increasing trends of annual TS are smaller than that of TA in boreal regions. The systematic and
significant differences in the relationship between TS and TA across the circumpolar north is important for understanding and assessing the impacts of climate change and for reconstruction of historical climate based on ground temperature profiles
for the northern high latitudes. |
| Résumé | (Résumé en langage clair et simple, non publié et disponible en anglais seulement)
Air temperature in the northern high latitudes is increasing twice as fast as the global average, which could
have significant impacts on permafrost, infrastructure, and the huge amount of organic carbon stored in frozen soils. However, these impacts are mainly through changes in soil temperature. Soil temperature in this region is strongly mediated by snow
cover, and our understanding about this effect is limited at local and regional scales. In this study, we report a large offset between mean soil and air temperatures in low arctic and northern boreal regions across the circumpolar based on
observations at 587 sites across the northern high latitudes. The offset decreases both northward and southward. Thick and relatively long period of snow cover in boreal regions decouples soil and air temperatures, and reduces the response of soil
temperature. These results are important for assessing the impacts of climate warming and for reconstruction of historical climate based on deep ground temperatures. |
| GEOSCAN ID | 311396 |
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