Biskaborn, Boris K.

Lanckman, Jean-Pierre

Lantuit, Hugues

Nötzli, Jeanette

Romanowsky, Vladimir E.

Schoeneich, Philippe

Shiklomanov, Nikolay

Smith, Sharon L.

Streletskiy, Dmitry

Vieira, Gonçalo

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Global outlook from the Global Terrestrial Network for Permafrost (GTN-P): Changes in thermal state of permafrost and active layer thickness over the last decadeACKNOWLEDGMENTS: We are grateful to the IPA for continuous support and all members of the GTN-P community for providing the data. To learn more about the network, please visit: http://gtnp.arcticportal.org/The Global Terrestrial Network for Permafrost (GTN-P) providessystematic long-term measurements of permafrost temperature and activelayer thickness (ALT), and is part of the Global Terrestrial ObservingSystem of the Global Climate Observing System. Two major componentsof the GTN-P are long-term monitoring of the thermal state of permafrostin an extensive borehole network, the Thermal State of Permafrost (TSP)and monitoring of the active-layer thickness, the Circumpolar ActiveLayer Monitoring (CALM).Long-term monitoring of permafrost thermal state and active layerthickness generates essential baseline information for assessment ofclimate change impacts in polar and high mountain regions, modeling ofecosystem processes and for many engineering applications in permafrostregions.Dmitry Streletskiy1, Boris K. Biskaborn2, Vladimir E. Romanovsky3, Sharon L. Smith4, Nikolay Shiklomanov1, Jeannette Nötzli5, Gonçalo Vieira6, Philippe Schoeneich7, Jean-Pierre F. Lanckman8, Hugues Lantuit2,91 The George Washington University, Washington, USA; 2 Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam, Germany; 3 Geophysical Institute, University of Alaska Fairbanks, Fairbanks, USA; 4 Geological Survey of Canada, Natural Resources Canada, Ottawa, Canada; 5 WSL Institute for Snow and Avalanche Research SLF, Davos, Switzerland; 6 Instituto de Geografia e Ordenamento do Território, University of Lisbon, Lisbon, Portugal; 7 Institut de Géographie Alpine, Université de Grenoble Alpes, France; 8 Arctic Portal, Akureyri, Iceland, 9 University of Potsdam, Potsdam, GermanyThe results show that ALT exhibits large interannual variability, but hasgenerally increased in the majority of regions, especially in EuropeanArctic where several sites experienced permafrost degradation. At severalsites of the northwest Antarctic Peninsula, ALT has been stable or evendecreased. The detailed analysis of ALT spatial and temporal variability isavailable tomorrow in GC31H-1200 Long-term active-layer dynamics:results of 22 years of field observations in Northern Hemispherepermafrost regions.Permafrost temperature has generally increased across the entirepermafrost domain which is consistent with air temperature trends,however, there is considerable spatial and temporal variability. The greatestincreases in permafrost temperature are found in the High Arctic of Canadaand western Siberia and are generally pronounced in regions with coldcontinuous permafrost such as Russia and North America. In the Subarctic,where permafrost temperatures are relatively high and within 2°C of thefreezing point, there has been little change and permafrost temperature issimilar to that of the IPY snapshot. In Alpine permafrost areas, however,most measurement sites also show significant warming since 2009.This work reveals further need for improved geographic coverage of theobservational network in order to assess changes in permafrost system atglobal scales.Delete trend, make NSIDC different colorGovernance structure and information flow of the  GTN-P The GTN-P launched a sophisticated data management system (DMS, gtnpdatabase.org), which allows automatic data submission,standardization, quality control, processing and data access. Presently 1350 TSP boreholes and 250 active layer sites are registered within theDMS, but the geographic distribution of sites and the length, specifications and quality of observations vary within and between the regions.The front page  of the database and the workflow diagram of the GTN-P Data Management System. The DMS allows data search, queries, visualization and download in common formats (including csv and netCDF among others)http://gtnpdatabase.org/ Using DMS capabilities we selected sites with data available around the last International Polar Year (2005-2009), when major push was madeto improve the permafrost observational network, and in the last five years (2010-2015). The selected sites were used to estimate changes inthermal state of permafrost and active layer thickness between the two reference periods. The preliminary results are outlines below.The map shows permafrost temperature over the 2010-2016.Generally permafrost temperature is increasing following north –south bioclimatic gradient, but difference is site-specific conditions,such as snow depth, vegetation and soil properties complicated thisgeneral geographic trendMap of active layer monitoring sites in the Norther Hemisphere. Note that majority of the sites are grids (100 x 100 m or 1  x  1 km) allowing estimations of spatial variability of ALT.  The graphs showing the number and distribution of permafrost monitoring sites. Majority of the sites were initiated in late 2000s.Recent integration of historic dataset allowed to extend the geographyand length of observations in Russia, but differences in methodologieslimit the integration of these data into GTN-PThe map in the centre shows the changes in permafrost temperature from 2004-2009 to 2010-2015. The quality index shown on the pap isbased on number of years with complete observations, with red markers show low confidence, yellow show medium confidence and greenshowing high confidence of the estimates. The time series of permafrost temperature are chosen from various regions and have variablelengths and temperature scales in order to showcase various examples of changes in permafrost temperature and also with dataavailability.Barrow, AlaskaMackenzie Delta, CanadaAbisko, Sweden Murtal-Corvatsch, SwitzerlandNovyi Urengoy,RussiaMagadan, RussiaYakutsk, RussiaNEED CHINA HERE

Global outlook from the Global Terrestrial Network for Permafrost (GTN-P): 

Changes in thermal state of permafrost and active layer thickness over the last decade

Global outlook from the Global Terrestrial Network for Permafrost (GTN-P): Changes in thermal state of permafrost and active layer thickness over the last decade

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