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


Contact
Boris.Biskaborn [ at ] awi.de

Abstract

Long-term monitoring permafrost thermal state and active layer thickness (ALT) is critical in providing the baseline for assessment of climate change impacts in polar and high mountain regions, modeling of ecosystem processes and as an input for many engineering applications on permafrost among others. The Global Terrestrial Network for Permafrost (GTN-P) provides systematic long-term measurements of permafrost temperature and ALT, and is part of the Global Terrestrial Observing System (GTOS) of the Global Climate Observing System (GCOS). The GTN-P launched a sophisticated data management system (DMS), which allows automatic data submission, standardization, quality control, and processing. Presently 1250 permafrost boreholes and 250 active layers sites are registered within the DMS (gtnpdatabase.org), but the geographic distribution of sites and length of observations vary considerably among regions. Using DMS capabilities we selected sites with data available during the last International Polar Year (IPY) and in the recent 4 years and estimated changes in thermal state of permafrost and active layer thickness between the two reference periods. The results show that following air temperature trends, permafrost temperature has generally increased across permafrost domain, however, there is considerable spatial variability. The highest increases in permafrost temperature are found in Canadian High Arctic and are pronounced in regions with cold continuous permafrost such as Siberia and North America. In the sub-arctic, where permafrost temperatures are relatively high, the warming trend is less pronounced and permafrost temperature is similar to that of the IPY snapshot. In alpine permafrost areas, however, most measurement sites also show significant warming since 2009. ALT exhibits large interannual variability, but has generally increased in the majority of regions, especially in European Arctic sector where several sites experienced permafrost degradation. In several sites at northwest Antarctic Peninsula, ALT has been stable or even decreased. This work reveals further need for improved geographic coverage of observational network in order to assess changes in permafrost system at global scales.



Item Type
Conference (Poster)
Authors
Divisions
Primary Division
Programs
Primary Topic
Peer revision
Peer-reviewed
Publication Status
Published
Event Details
AGU 2016, 12 Dec 2016 - 16 Dec 2016, San Francisco.
Eprint ID
42848
Cite as
Streletskiy, D. , Biskaborn, B. K. , Romanovsky, V. E. and Smith, S. L. (2016): 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 , AGU 2016, San Francisco, 12 December 2016 - 16 December 2016 .


Share

Research Platforms
N/A

Campaigns


Actions
Edit Item Edit Item