Temperature, accumulation, and ice sheet elevation in central Greenland through the last deglacial transition

Cuffey, Kurt M.; Clow, Gary D.

doi:10.1029/96jc03981

Cited by 526 publications

(428 citation statements)

References 44 publications

(11 reference statements)

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“…Such an approach of using both a forward model and a method of optimising surface temperature histories has been used previously (see, for example Johnsen, 1977;MacAyeal et al, 1991;Johnsen et al, 1995;Cuffey et al, 1995;Cuffey and Clow, 1997;Dahl-Jensen et al, 1998Barrett et al, 2009;Muto et al, 2011;Orsi et al, 2012). The forward models used in these studies all included the heating associated with firn densification with the exceptions of MacAyeal et al (1991);Johnsen et al (1995); Barrett et al (2009) and Muto et al (2011).…”

Section: Numerical Modelmentioning

confidence: 99%

“…However, the methods of generating possible surface temperature histories (to select from) differ and fall into three broad categories (Orsi et al, 2012): (i) optimisations based on relationships between surface temperature and stable water isotope ratios (e.g. Johnsen, 1977;Cuffey et al, 1995;Cuffey and Clow, 1997;Johnsen et al, 1995); (ii) Monte Carlo based approaches (e.g. Dahl-Jensen et al, 1998Barrett et al, 2009); and (iii) generalised least-squares solution of a linearised version of the problem (e.g.…”

Section: Numerical Modelmentioning

confidence: 99%

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Borehole temperatures reveal a changed energy budget at Mill Island, East Antarctica, over recent decades

et al. 2013

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Abstract.A borehole temperature record from the Mill Island (East Antarctica) icecap reveals a large surface warming signal manifested as a 0.75 K temperature difference over the approximate 100 m depth in the zone of zero annual amplitude below the seasonally varying zone. The temperature profile shows a break in gradient around 49 m depth, which we model with inverse numerical simulations, indicating that surface warming started around the austral summer of 1980/81 AD ±5 yr. This warming of approximately 0.37 K per decade is consistent with trends seen in both instrumental and other reconstructions for Antarctica and, therefore, suggests that regional-rather than local-scale processes are largely responsible. Alteration of the surface energy budget arising from changes in radiation balances due to local cloud, the amount of liquid deposition and local air temperatures associated with altered air/sea exchanges also potentially plays a role at this location due to the proximity of the Shackleton Ice Shelf and sea-ice zone.

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Section: Numerical Modelmentioning

confidence: 99%

Section: Numerical Modelmentioning

confidence: 99%

Borehole temperatures reveal a changed energy budget at Mill Island, East Antarctica, over recent decades

et al. 2013

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“…We use a multiple proxy network for our reconstruction, which consists of several ice core proxies from Greenland (annual accumulation rates and annual isotopic concentrations of ␦ 18 O) and tree-ring-width chronologies from Europe (Clausen et al 1988;Cuffey and Clow 1997;Cross 1997; and additional data available online, see http://www.ngdc.noaa.gov/paleo/ icecore/icecore-varlist.html for ice core information and for the tree ring archive see ftp://ftp.ngdc.noaa.gov/ paleo/treering). In order to compromise between the statistical constraint of an appropriate proxy number and the desire for a long extension of the NAOI we restrict our analysis to the reconstruction period of 1700-1978.…”

Section: B Spatial Differences In the Proxy-nao Relationshipsmentioning

confidence: 99%

Scale-Dependent Reconstruction of the NAO Index

Timm¹,

Ruprecht²,

Kleppek³

2004

J. Climate

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A method is presented to reconstruct decadal variations of the North Atlantic Oscillation (NAO). The spectral characteristics of the NAO on time scales of decades and longer are of particular interest for the understanding of North Atlantic ocean-atmosphere interactions. The reconstruction is based on a transfer model calibration that uses bandpass-filtered time series. The maximum overlap discrete wavelet transform (MODWT) is applied for decomposing the time series variance into different time scales. A total of 43 proxies, including Greenland ice cores and European tree-ring chronologies, are selected and regionally grouped providing four independent reconstructions for the period 1700-1978. The mean reconstruction agrees well with two recently published reconstructions during most of the time period. However, there are considerable differences in the earliest part before 1750. Running correlations between the reconstructions indicate that time-dependent relations exist among the different NAO reconstructions. The results suggest that the geographical distribution of proxies strongly affects the reconstruction and could explain some of the apparent discrepancies among the reconstructions recently published in literature. In the early eighteenth century, external forcing (solar, volcanic) seems to mask the NAO signature within the proxies.

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“…The calculated fractional thickness of any layer in the ice core relative to its initial thickness (in ice equivalent units) is often called the 'thinning function'. Cutler and others (1995) and Cuffey and Clow (1997) used modelled thinning functions to infer accumulation rate histories from the measured spacing of annual layers in the Greenland Ice Sheet Project 2 (GISP2) ice core.…”

Section: Introductionmentioning

confidence: 99%

Ice deformation in the vicinity of the ice-core site at Taylor Dome, Antarctica, and a derived accumulation rate history

2007

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ABSTRACT. Knowledge of ice flow and strain rate in the vicinity of the Taylor Dome (East Antarctica) ice-core site enhances interpretation of the paleoclimate information from the ice core. We measured surface ice motion by repeated optical and GPS surveys of a network of 253 markers. We developed a robust data reduction method that uses least squares based on singular value decomposition, to simultaneously calculate positions and velocities of these markers in a geocentric coordinate system. Constrained by these surface velocities, we used a finite-element model to compute the modern ice velocity field at depth. As the geometry of Taylor Dome appears to have been steady through the Holocene, we used particle paths from a steady-state model to track ice particles to the ice core from their points of origin on the surface. By removing the effects of path-dependent vertical strain, we derived past accumulation rates at the origin points of those particle paths from measured layer thicknesses in the ice core. Comparison with accumulation rates estimated from concentrations of 10 Be and SO 4 in the core suggests that significant amounts of snow were lost by wind scouring during the Last Glacial Maximum and at $ $50 kyr BP.

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Temperature, accumulation, and ice sheet elevation in central Greenland through the last deglacial transition

Abstract: Abstract.We present a combined heat-and ice-flow model, constrained by measurements of temperature in the Greenland Ice Sheet Project 2 (GISP2) borehole and by the GISP2 51so record and depth-age scale, which determines a

Cited by 526 publications

References 44 publications

Borehole temperatures reveal a changed energy budget at Mill Island, East Antarctica, over recent decades

Borehole temperatures reveal a changed energy budget at Mill Island, East Antarctica, over recent decades

Scale-Dependent Reconstruction of the NAO Index

Ice deformation in the vicinity of the ice-core site at Taylor Dome, Antarctica, and a derived accumulation rate history

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