Active layer monitoring in Antarctica: an overview of results from 2006 to 2015

ABSTRACT Monitoring of active layer thawing depth and active layer thickness (ALT), using mechanical pronging and continuous temperature data logging, has been undertaken under the Circumpolar Active Layer Monitoring – South (CALM-S) program at a range of sites across Antarctica. The objective of this study was to summarize key data from sites in different Antarctic regions from 2006 to 2015 to review the state of the active layer in Antarctica and the effectiveness of the CALM-S program. The data from 16 sites involving 8 CALM-S and another 8 boreholes across the Antarctic have been used in the study. Probing for thaw depth, while giving information on local spatial variability, often underestimates the maximum ALT of Antarctic soils compared to that determined using continuous temperature monitoring. The differences are likely to be caused by stones limiting probe penetration and the timing of probing not coinciding with the timing of maximum thaw, which varies between seasons. The information on the active layer depth is still sparse in many regions and the monitoring needs to be extended and continued to provide a better understanding of both spatial and temporal variability in Antarctic soil thermal properties.

[1]  Miguel Ramos,et al.  Thermal state of permafrost and active‐layer monitoring in the antarctic: Advances during the international polar year 2007–2009 , 2010 .

[2]  F Navarro,et al.  Recent regional climate cooling on the Antarctic Peninsula and associated impacts on the cryosphere. , 2017, The Science of the total environment.

[3]  M. Guglielmin,et al.  Permafrost thermal regime from two 30‐m deep boreholes in southern victoria land, antarctica , 2011 .

[4]  M. Ramos,et al.  Drilling and installation of boreholes for permafrost thermal monitoring on Livingston Island in the maritime Antarctic , 2009 .

[5]  M. Ramos,et al.  Ground temperature and permafrost distribution in Hurd Peninsula (Livingston Island, Maritime Antarctic): an assessment using freezing indexes and TTOP modelling , 2017 .

[6]  N. Mergelov Soils of wet valleys in the Larsemann Hills and Vestfold Hills oases (Princess Elizabeth Land, East Antarctica) , 2014, Eurasian Soil Science.

[7]  S. Jacobs,et al.  Antarctic climate change and the environment: an update , 2013, Polar Record.

[8]  A. Caselli,et al.  RÉGIMEN TÉRMICO Y VARIABILIDAD ESPACIAL DE LA CAPA ACTIVA EN ISLA DECEPCION, ANTÁRTIDA , 2014 .

[9]  G. Vieira,et al.  Local influences of geothermal anomalies on permafrost distribution in an active volcanic island (Deception Island, Antarctica) , 2014 .

[10]  M. Ramos,et al.  Thermal characterization of the active layer at the Limnopolar Lake CALM-S site on Byers Peninsula (Livingston Island), Antarctica , 2014 .

[11]  P. Convey,et al.  Permafrost and snow monitoring at Rothera Point (Adelaide Island, Maritime Antarctica): Implications for rock weathering in cryotic conditions , 2014 .

[12]  M. Ramos,et al.  Active layer thermal regime in two climatically contrasted sites of the Antarctic Peninsula region , 2016, IEEE Conference on Computational Intelligence and Games.

[13]  B. Stenni,et al.  Isotopic composition and thermal regime of ice wedges in northern Victoria Land, East Antarctica , 2011 .

[14]  D. Nývlt,et al.  Active layer thermal dynamics at two lithologically different sites on James Ross Island, Eastern Antarctic Peninsula , 2017 .

[15]  J. Turner,et al.  Antarctic climate change during the last 50 years , 2005 .

[16]  Miguel Ramos,et al.  Snow cover evolution, on 2009-2014, at the Limnopolar Lake CALM-S site on Byers Peninsula, Livingston Island, Antarctica. , 2017 .

[17]  F. Hrbáček,et al.  Effect of Snow Cover on the Active‐Layer Thermal Regime – A Case Study from James Ross Island, Antarctic Peninsula , 2016 .

[18]  Mauro Guglielmin,et al.  Ground surface temperature (GST), active layer and permafrost monitoring in continental Antarctica , 2006 .

[19]  M. Ramos,et al.  Interannual active layer variability at the Limnopolar Lake CALM site on Byers Peninsula, Livingston Island, Antarctica , 2013, Antarctic Science.

[20]  M. Guglielmin,et al.  A permafrost warming in a cooling Antarctica? , 2012, Climatic Change.

[21]  J. Bockheim The Soils of Antarctica , 2015 .

[22]  Miguel Ramos,et al.  Active layer dynamics in three topographically distinct lake catchments in Byers Peninsula (Livingston Island, Antarctica) , 2017 .

[23]  M. Ramos,et al.  Thermal conductivity and thermal diffusivity of cores from a 26 meter deep borehole drilled in Livingston Island, Maritime Antarctic , 2012 .

[24]  John Turner,et al.  Absence of 21st century warming on Antarctic Peninsula consistent with natural variability , 2016, Nature.

[25]  M. Ramos,et al.  Recent shallowing of the thaw depth at Crater Lake, Deception Island, Antarctica (2006–2014) , 2017 .

[26]  D. Campbell,et al.  Temporal and spatial variation in active layer depth in the McMurdo Sound Region, Antarctica , 2009, Antarctic Science.

[27]  M. Ramos,et al.  Evaluation of the ground surface Enthalpy balance from bedrock temperatures (Livingston Island, Maritime Antarctic) , 2009 .

[28]  F. Nelson,et al.  The circumpolar active layer monitoring (calm) program: Research designs and initial results , 2000 .

[29]  Miguel Ramos,et al.  Climate warming and permafrost dynamics in the Antarctic Peninsula region , 2013 .

[30]  James G. Bockheim,et al.  Permafrost distribution in the southern circumpolar region and its relation to the environment: A review and recommendations for further research , 1995 .

[31]  C. McKay,et al.  Solar Radiation and Air and Ground Temperature Relations in the Cold and Hyper‐Arid Quartermain Mountains, McMurdo Dry Valleys of Antarctica , 2016 .

[32]  Mauro Guglielmin,et al.  Permafrost warming and vegetation changes in continental Antarctica , 2014 .

[33]  I. Meiklejohn,et al.  Temporal variability of ground thermal regimes on the northern buttress of the Vesleskarvet nunatak, western Dronning Maud Land, Antarctica , 2016, Antarctic Science.

[34]  C. Mueller,et al.  Active layer monitoring at CALM-S site near J.G.Mendel Station, James Ross Island, eastern Antarctic Peninsula. , 2017, The Science of the total environment.

[35]  C. Schaefer,et al.  Active layer temperature in two Cryosols from King George Island, Maritime Antarctica , 2012 .

[36]  M. Guglielmin,et al.  Spatial and temporal variability of ground surface temperature and active layer thickness at the margin of maritime Antarctica, Signy Island , 2012 .

[37]  C. Schaefer,et al.  Active layer thermal monitoring of a Dry Valley of the Ellsworth Mountains, Continental Antarctica , 2017 .

[38]  Peter T. Fretwell,et al.  An automated methodology for differentiating rock from snow, clouds and seain Antarctica from Landsat 8 imagery: a new rock outcrop map and areaestimation for the entire Antarctic continent , 2016 .