Isotope Climatic Record Over The Last 2.5 KA from Dome C, Antarctica, Ice cores

Benoist, Jean-Pierre; Jouzel, Jean; Lorius, C.; Merlivat, Liliane; Pourchet, M.

doi:10.1017/s0260305500002457

Cited by 48 publications

(12 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Edmonson Point glacier retreated in 2 distinct phases, around 920-1020 and 1270-1400, and then advanced at least 150 m after the 15th century. Isotopic thermometry from ice cores at Dome C (74.65°S, 124.17°E, elevation 3240 m) and Law Dome (66.73°S, 112.83°E, elevation 1390 m) both indicate cooler and warmer anomalies for the Little Ice Age and Medieval Warm Period respectively (Benoist et al 1982, Morgan 1985. High-resolution records of magnetic susceptibility from deep sea cores (Domack & Mayewski 1999, Domack et al 2001) drilled near Palmer Deep site (64.86°S, 64.21°W) off the Antarctic Peninsula also show a marked increased, in bioproductivity, hence a decrease in magnetic susceptibility because of dilution of the magnetite, with a peak centered around 1000-1100 yr BP.…”

Section: Antarcticamentioning

confidence: 99%

Proxy climatic and environmental changes of the past 1000 years

Soon

Baliunas²

2003

Clim. Res.

128

View full text Add to dashboard Cite

The 1000 yr climatic and environmental history of the Earth contained in various proxy records is reviewed. As indicators, the proxies duly represent local climate. Because each is of a different nature, the results from the proxy indicators cannot be combined into a hemispheric or global quantitative composite. However, considered as an ensemble of individual expert opinions, the assemblage of local representations of climate establishes both the Little Ice Age and Medieval Warm Period as climatic anomalies with worldwide imprints, extending earlier results by Bryson et al. (1963), Lamb (1965, and numerous intervening research efforts. Furthermore, the individual proxies can be used to address the question of whether the 20th century is the warmest of the 2nd millennium locally. Across the world, many records reveal that the 20th century is probably not the warmest nor a uniquely extreme climatic period of the last millennium.

show abstract

Section: Antarcticamentioning

confidence: 99%

Proxy climatic and environmental changes of the past 1000 years

Soon

Baliunas²

2003

Clim. Res.

128

View full text Add to dashboard Cite

show abstract

“…Local variations in the spatial pattern of snow accumulation lead to short-term differences in the time series of annually averaged parameters at adjacent drilling sites, the so-called "deposition noise" (the uncorrelated variance of two adjacent i!i time series), which has been estimated for several sites in Greenland [Robin, 1983;Fisher et al, 1985] and in Antarctica [Benoist et al, 1982;Peel, 1992], using data from duplicate cores. It is therefore possible to obtain a crude estimate of the length of averaging needed to reduce the deposition noise to a level needed to detect a given magnitude of "climatic" signal.…”

Section: Empirical Estimates Of the •/T• Relationshipsmentioning

confidence: 99%

Validity of the temperature reconstruction from water isotopes in ice cores

Jouzel¹,

Alley²,

Cuffey³

et al. 1997

J. Geophys. Res.

Self Cite

587

445

View full text Add to dashboard Cite

Abstract. Well-documented present-day distributions of stable water isotopes (HDO and H2180) show the existence, in middle and high latitudes, of a linear relationship between the mean annual isotope content of precipitation (/SD and/5•SO) and the mean annual temperature at the precipitation site. Paleoclimatologists have used this relationship, which is particularly well obeyed over Greenland and Antarctica, to infer paleotemperatures from ice core data. There is, however, growing evidence that spatial and temporal isotope/ surface temperature slopes differ, thus complicating the use of stable water isotopes as paleothermometers. In this paper we review empirical estimates of temporal slopes in polar regions and relevant information that can be inferred from isotope models: simple, Rayleigh-type distillation models and (particularly over Greenland) general circulation models (GCMs) fitted with isotope tracer diagnostics. Empirical estimates of temporal slopes appear consistently lower than present-day spatial slopes and are dependent on the timescale considered. This difference is most probably due to changes in the evaporative origins of moisture, changes in the seasonality of the precipitation, changes in the strength of the inversion layer, or some combination of these changes. Isotope models have not yet been used to evaluate the relative influences of these different factors. The apparent disagreement in the temporal and spatial slopes clearly makes calibrating the isotope paleothermometer difficult. Nevertheless, the use of a (calibrated) isotope paleothermometer appears justified; empirical estimates and most (though not all) GCM results support the practice of interpreting ice core isotope records in terms of local temperature changes. •

show abstract

“…The 905-m-long ice core obtained at Dome C, an ice divide region (elevation: 3240 m; annual temperature; -53.5 ° C and mean accumulation: 3.4 g cm -2 y-a) has previously been studied both concerning the full record Lorius et al 1979) and over the last two millenium (Benoist et al 1982). The excellent core recovery has made possible isotopic measurements on a quasi-continuous basis.…”

Section: Fig 2 Map Of Antarctica Showing Location Of the Drilling Smentioning

confidence: 99%