Multiyear accumulation and temperature history near the North Greenland Ice Core Project site, north central Greenland

Shuman, C. A.; Bromwich, David H.; Kipfstuhl, J.; Schwager, Matthias

doi:10.1029/2001jd900197

Cited by 27 publications

(24 citation statements)

References 59 publications

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“…Over the past two decades, it has become clear that the isotopeÁtemperature slope used for calibrating ice core derived temperature variations back in time varies in both time and space. Notably, the temporal slope for d 18 O differs from the classical spatially derived Greenland isotopeÁtemperature slope of 0.67/8C (Johnsen et al, 1989), with the temporal slope mostly being found to be lower than the spatial slope on annual, decadal and up to millennial time scales (Cuffey et al, 1992;Shuman et al, 1995Shuman et al, , 2001Johnsen et al, 2001). On glacialÁinterglacial timescales, the isotopeÁtemperature slope is thought to be affected by precipitation weighting, due to limited winter precipitation during cold stages (Werner et al, 2000;Masson-Delmotte et al, 2005).…”

Section: Introductionmentioning

confidence: 92%

Modelling the response of stable water isotopes in Greenland precipitation to orbital configurations of the previous interglacial

Sjolte

Hoffmann

Johnsen

2014

Tellus B: Chemical and Physical Meteorology

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A B S T R A C TThe relation between d 18 O of precipitation and temperature has been used in numerous studies to reconstruct past temperatures at ice core sites in Greenland and Antarctica. During the past two decades, it has become clear that the slope between d 18 O and temperature varies in both space and time. Here, we use a general circulation model driven by changes in orbital parameters to investigate the Greenland d 18 OÁtemperature relation for the previous interglacial, the Eemian. In our analysis, we focus on changes in the moisture source regions, and the results underline the importance of taking the seasonality of climate change into account. The orbitally driven experiments show that continental evaporation over North America increases during summer in the warm parts of the Eemian, while marine evaporation decreases. This likely flattens the Greenland d 18 O response to temperature during summer. Since the main climate change in the experiments occurs during summer this adds to a limited response of d 18 O, which is more strongly tied to temperature during winter than during summer. A southÁwest to northÁeast gradient in the d 18 OÁtemperature slope is also evident for Greenland, with low slopes in the southÁwest and steeper slopes in the northÁeast. This probably reflects the proportion of continental moisture and Arctic moisture arriving in Greenland, with more continental moisture in the southÁwest and less in the northÁeast, and vice versa for the Arctic moisture.

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Section: Introductionmentioning

confidence: 92%

Modelling the response of stable water isotopes in Greenland precipitation to orbital configurations of the previous interglacial

Sjolte

Hoffmann

Johnsen

2014

Tellus B: Chemical and Physical Meteorology

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“…The recent interannual variability of water stable isotopes (δ 18 O, δD) shows similarities with the variability of the Baffin Bay sea-ice extent. Unlike central Greenland where snow falls year round, NW Greenland precipitation occur predominantly in summer according to snow pit studies (Shuman et al, 1995(Shuman et al, , 2001) and model simulations (SteenLarsen et al, 2011;Sjolte et al, 2011;Persson et al, 2011). This specificity of the precipitation seasonality explains the particularly weak fingerprint of the North Atlantic Oscillation in NEEM shallow ice cores (Steen-Larsen et al, 2011) compared to GISP2 (Barlow et al, 1993).…”

Section: Introductionmentioning

confidence: 99%

Spatial gradients of temperature, accumulation and δ<sup>18</sup>O-ice in Greenland over a series of Dansgaard–Oeschger events

et al. 2013

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Abstract. Air and water stable isotope measurements from four Greenland deep ice cores (GRIP, GISP2, NGRIP and NEEM) are investigated over a series of Dansgaard–Oeschger events (DO 8, 9 and 10), which are representative of glacial millennial scale variability. Combined with firn modeling, air isotope data allow us to quantify abrupt temperature increases for each drill site (1σ = 0.6 °C for NEEM, GRIP and GISP2, 1.5 °C for NGRIP). Our data show that the magnitude of stadial–interstadial temperature increase is up to 2 °C larger in central and North Greenland than in northwest Greenland: i.e., for DO 8, a magnitude of +8.8 °C is inferred, which is significantly smaller than the +11.1 °C inferred at GISP2. The same spatial pattern is seen for accumulation increases. This pattern is coherent with climate simulations in response to reduced sea-ice extent in the Nordic seas. The temporal water isotope (δ18O)–temperature relationship varies between 0.3 and 0.6 (±0.08) ‰ °C−1 and is systematically larger at NEEM, possibly due to limited changes in precipitation seasonality compared to GISP2, GRIP or NGRIP. The gas age−ice age difference of warming events represented in water and air isotopes can only be modeled when assuming a 26% (NGRIP) to 40% (GRIP) lower accumulation than that derived from a Dansgaard–Johnsen ice flow model.

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“…that produce an annual cycle in the way snow is deposited on the surface (Shuman et al, 2001). This method is somewhat analogous to dating by counting tree rings.…”

Section: Counting Layers Visuallymentioning

confidence: 99%

“…3.3 from automated weather stations (AWSs) and satellite temperature sensors provide additional support for the linear relationship of d with T (Shuman et al, 2001). The only polar site for which suitable data are available is the South Pole station, where temperatures are available from 1957 to 1978 along with well-dated isotopic pro®les.…”

Section: Processing Ice Core Datamentioning

confidence: 99%

Ice Ages and Interglacials

Rapp

2009

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Multiyear accumulation and temperature history near the North Greenland Ice Core Project site, north central Greenland

Cited by 27 publications

References 59 publications

Modelling the response of stable water isotopes in Greenland precipitation to orbital configurations of the previous interglacial

Modelling the response of stable water isotopes in Greenland precipitation to orbital configurations of the previous interglacial

Spatial gradients of temperature, accumulation and δ<sup>18</sup>O-ice in Greenland over a series of Dansgaard–Oeschger events

Ice Ages and Interglacials

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Multiyear accumulation and temperature history near the North Greenland Ice Core Project site, north central Greenland

Cited by 27 publications

References 59 publications

Modelling the response of stable water isotopes in Greenland precipitation to orbital configurations of the previous interglacial

Modelling the response of stable water isotopes in Greenland precipitation to orbital configurations of the previous interglacial

Spatial gradients of temperature, accumulation and δ&lt;sup&gt;18&lt;/sup&gt;O-ice in Greenland over a series of Dansgaard–Oeschger events

Ice Ages and Interglacials

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Spatial gradients of temperature, accumulation and δ<sup>18</sup>O-ice in Greenland over a series of Dansgaard–Oeschger events