Depth and seasonal variations in the thermal properties of Antarctic Dry Valley permafrost from temperature time series analysis

Pringle, Daniel; Dickinson, Warren W.; Trodahl, H. J.; Pyne, Alex

doi:10.1029/2002jb002364

Cited by 25 publications

(52 citation statements)

References 26 publications

(50 reference statements)

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“…A similar result was found for Australia by Plummer et al [21]. For other significant work, see Derksen and Walker [5], Pringle et al [22], Aliani et al [1], Borges et al [3], Saab et al [25], Bodri and Cermak [2], Holzbecher [10] and Taylor et al [29].…”

Section: Introductionsupporting

confidence: 82%

Modelling Temperature Trends in New Zealand

Withers¹,

Krouse²,

Pearson

et al. 2007

Environ Model Assess

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If global warming is accelerating, then one might expect temperatures for most stations to be accelerating and perhaps variability to be increasing. In this study, we examine 57 New Zealand temperature time series for evidence of non-linearity and changing variability. These correspond to time series for annual minima, annual means and annual maxima for 19 stations. Estimation is by an extended least-squares method. We find a surprising diversity of behaviour of these series -presumably reflecting their different geographic factors as well as series length. We give evidence of regions where temperatures are decreasing. For series where a linear trend is significant, it is downwards in about one third of the cases. This proportion was higher in the South Island, especially for series of minima. Where a non-linear trend is significant, temperatures are decelerating in about one half of the cases. The ratio of downward to upward trends is highest among annual maxima and South Island minima and smallest in annual means. Where a linear trend in the variability is significant, it is decreasing in 13 cases and increasing in 5 cases, although possibly this is partly due to poorer quality data last century. Where a nonlinear trend in the variability is significant, variability is decelerating in about two thirds of the cases. The results are used to project upper and lower return levels of minima, means and maxima for each of the series to the year 2010.

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Section: Introductionsupporting

confidence: 82%

Modelling Temperature Trends in New Zealand

Withers¹,

Krouse²,

Pearson

et al. 2007

Environ Model Assess

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“…Williams and Smith, ), a thermal diffusivity of 6.0 m 2 yr ‐1 was obtained for the mineral dry soil layer above the ice table. This value is within the range of dry soils at Table Mountain and near Lake Fryxell (Pringle et al ., ; Ikard et al ., ). Based on our calculated thermal diffusivity, the damping depth for diurnal temperature variation is approximately 20 cm.…”

Section: Results and Interpretationsmentioning

confidence: 99%

Solar Radiation and Air and Ground Temperature Relations in the Cold and Hyper‐Arid Quartermain Mountains, McMurdo Dry Valleys of Antarctica

Lacelle

Lapalme

Dávila

et al. 2015

Permafrost & Periglacial

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This study compares the relations between solar radiation and air and ground temperatures in the Quartermain Mountains of the McMurdo Dry Valleys of Antarctica with those in ice‐free Victoria Land and Arctic Canada. The surface offset is near 0°C at all sites in the Quartermain Mountains and other sites in coastal Victoria Land, whereas the thermal offset is near 0°C at shallow ice table depths (< 20 cm) and near 1°C for ice tables deeper than the depth of diurnal temperature variation. The surface and thermal offsets in Victoria Land differ markedly from those in Arctic Canada, which are generally characterised by a positive surface offset and a negative thermal offset. These important differences highlight the effects of a lack of vegetation, surface organic layer, snow cover and moisture content in near‐surface soils on the direction and magnitude of surface and thermal offsets. Summer ground surface temperatures in the Quartermain Mountains correlate strongly with incoming solar radiation. Based on measured ground surface temperatures and modelled potential incoming solar radiation, two zones with distinct ground surface temperatures are defined in the Quartermain Mountains: (i) perennially cryotic zones (PCZs) characterised by ground surface temperatures always below 0°C; and (ii) seasonally non‐cryotic zones (NCZs) characterised by ground surface temperatures > 0°C for at least a few hours. Soils in the PCZs experience water exchange through vapour diffusion, whereas soils in the NCZs contain features associated with liquid water activity, such as increased soil moisture and frozen ponds recharged by snow/glacier meltwater. Copyright © 2015 John Wiley & Sons, Ltd.

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“…One string was buried in a wet soil patch (mean soil moisture = 21% by volume), while the second string was buried in a dry soil patch (mean soil moisture = 7% by volume). ATD was determined by the graphical fi nite difference method (Pringle et al, 2003) using temperature data from the thermistor strings, and a moving 48 h calculation window (i.e., the ATD for a given time was calculated using the change of temperature with depth for the preceding and subsequent 24 h relative to a data point). ATD calculations are summarized in Table 2.…”

Section: Water Track Thermal Propertiesmentioning

confidence: 99%

Water tracks and permafrost in Taylor Valley, Antarctica: Extensive and shallow groundwater connectivity in a cold desert ecosystem

Levy

Fountain

Gooseff

et al. 2011

Geological Society of America Bulletin

116

148

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Water tracks are zones of high soil moisture that route water downslope over the ice table in polar environments. We present physical, hydrological, and geochemical evidence collected in Taylor Valley, McMurdo Dry Valleys, Antarctica, which suggests that previously unexplored water tracks are a signifi cant component of this cold desert land system and constitute the major fl ow path in a cryptic hydrological system. Geological, geochemical, and hydrological analyses show that the water tracks are generated by a combination of infi ltration from melting snowpacks, melting of pore ice at the ice table beneath the water tracks, and melting of buried segregation ice formed during winter freezing. The water tracks are enriched in solutes derived from chemical weathering of sediments as well as from dissolution of soil salts. The water tracks empty into icecovered lakes, such as Lake Hoare, resulting in the interfi ngering of shallow groundwater solutions and glacier-derived stream water, adding complexity to the geochemical profi le. Approximately four orders of magnitude less water is delivered to Lake Hoare by any given water track than is delivered by surface runoff from stream fl ow; however, the solute delivery to Lake Hoare by water tracks equals or may exceed the mass of solutes delivered from stream fl ow, making water tracks signifi cant geochemical pathways. Additionally, solute transport is two orders of magnitude faster in water tracks than in adjacent dry or damp soil, making water tracks "salt superhighways" in the Antarctic cold desert. Accordingly, water tracks represent a new geological pathway that distributes water, energy, and nutrients in Antarctic Dry Valley, cold desert, soil ecosystems, providing hydrological and geochemical connectivity at the hillslope scale.

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Depth and seasonal variations in the thermal properties of Antarctic Dry Valley permafrost from temperature time series analysis

Cited by 25 publications

References 26 publications

Modelling Temperature Trends in New Zealand

Modelling Temperature Trends in New Zealand

Solar Radiation and Air and Ground Temperature Relations in the Cold and Hyper‐Arid Quartermain Mountains, McMurdo Dry Valleys of Antarctica

Water tracks and permafrost in Taylor Valley, Antarctica: Extensive and shallow groundwater connectivity in a cold desert ecosystem

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