Preliminary results of the close-off depth and the stable isotopic records along a 109.91 m ice core from Dome A, Antarctica

Hou, Shugui; Li, Yuansheng; Xiao, Cunde; Pang, Hongxi; Xu, Jianzhong

doi:10.1007/s11430-009-0039-6

Cited by 15 publications

(7 citation statements)

References 36 publications

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“…Depth-year series were calculated based on the settled marked layers and the density of each sample. The calculated average snow accumulation rate was 18.2 kg m -2 a -1 from 1965 to 1993 and 22.4 kg m -2 a -1 from 1993 to 2009, respectively, which was consistent with former observations in Dome A [ 2 , 26 ]. Our dating results was supported by previous studies [ 2 , 26 , 27 ].…”

Section: Methodssupporting

confidence: 90%

Uranium record from a 3 m snow pit at Dome Argus, East Antarctica

et al. 2018

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Understanding the distribution and transport of Uranium is important because it can lead to both chemical and radiological toxicity. This study presents the Uranium concentrations time series from 1964 to 2009 obtained from a 3 m deep snow pit at Dome Argus, East Antarctic Plateau. The data shows that Uranium concentrations vary from 0.0067 pg g-1 to 0.12 pg g-1, with a mean concentration of 0.044 pg g-1. Its mean concentration is 2–3 folds lower than at West Antarctica study sites, such as the Antarctic Peninsula (mean 0.12 pg g-1), IC-6 (Ice Core-6) (mean 0.11 pg g-1) and a suite of ice cores from the US ITASE traverse. Before the mid-1980s, the varieties of Uranium concentrations are relatively stable, with a very low mean concentration of 0.016 pg g-1and its main source is sea salt deposition, while a small number of anthropogenic sources are likely to be caused by Uranium mining operations in South Africa. A remarkable increase of Uranium concentrations has occurred since the mid-1980s (by a factor of ~ 9) compared with the amount before the mid-1980s. This increase coincides with the Uranium records at IC-6 and Antarctic Peninsula (DP-07-01) during the same period, and are mostly attributed to Uranium mining operations in Australia as a potential primary anthropogenic Uranium source. Our observations suggest that Uranium pollution in the atmosphere might have already become a global phenomenon.

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Section: Methodssupporting

confidence: 90%

Uranium record from a 3 m snow pit at Dome Argus, East Antarctica

et al. 2018

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“…3a), whereas no significant changes have been apparent at Dome A (Fig. 1) since 1260 (Ding et al, 2011a;Hou et al, 2009; (β40) and Tambora-1960s (β150) with respect to the SMB values of the entire ice core length (βtot); sites with SMBs greater than 300 kg m −2 yr −1 and lower than 300 kg m −2 yr −1 are represented with triangles and filled circles, respectively. Larger symbols indicate sites included in the verified ( ) dataset.…”

Section: Resultsmentioning

confidence: 99%

A synthesis of the Antarctic surface mass balance during the last 800 yr

et al. 2013

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Abstract. Global climate models suggest that Antarctic snowfall should increase in a warming climate and mitigate rises in the sea level. Several processes affect surface mass balance (SMB), introducing large uncertainties in past, present and future ice sheet mass balance. To provide an extended perspective on the past SMB of Antarctica, we used 67 firn/ice core records to reconstruct the temporal variability in the SMB over the past 800 yr and, in greater detail, over the last 200 yr.Our SMB reconstructions indicate that the SMB changes over most of Antarctica are statistically negligible and that the current SMB is not exceptionally high compared to the last 800 yr. High-accumulation periods have occurred in the past, specifically during the 1370s and 1610s. However, a clear increase in accumulation of more than 10 % has occurred in high SMB coastal regions and over the highest part of the East Antarctic ice divide since the 1960s. To explain the differences in behaviour between the coastal/ice divide sites and the rest of Antarctica, we suggest that a higher frequency of blocking anticyclones increases the precipitation at coastal sites, leading to the advection of moist air in the highest areas, whereas blowing snow and/or erosion have significant negative impacts on the SMB at windy sites. Eight hundred years of stacked records of the SMB mimic the total solar irradiance during the 13th and 18th centuries. The link between those two variables is probably indirect and linked to a teleconnection in atmospheric circulation that forces complex feedback between the tropical Pacific and Antarctica via the generation and propagation of a large-scale atmospheric wave train.

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“…No significant trend was found in accumulation rates in cores up to 100 years old before 1996 from Amundsenisen in DML . The Dome C area (Frezzotti et al, 2005;Urbini et al, 2008) has exhibited high accumulation since the 1960s, as observed along the traverse between Dome Fuji and EPICA DML, whereas no significant changes have been apparent at Dome A since 1260 (Ding et al, 2011;Hou et al, 2009). In the Talos Dome area at the border between EAP and VL, century-scale variability shows a slight increase (of a few percent) in accumulation rates over the last 200 years, in particular since the 1960s, compared with the period 1816-1965 (Frezzotti et al, 2007).…”

Section: Drivers Of Regional Precipitation 321 East Antarctic Platementioning

confidence: 89%

Regional Antarctic snow accumulation over the past 1000 years

et al. 2017

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Abstract. Here we present Antarctic snow accumulation variability at the regional scale over the past 1000 years. A total of 79 ice core snow accumulation records were gathered and assigned to seven geographical regions, separating the high-accumulation coastal zones below 2000 m of elevation from the dry central Antarctic Plateau. The regional composites of annual snow accumulation were evaluated against modelled surface mass balance (SMB) from RACMO2.3p2 and precipitation from ERA-Interim reanalysis. With the exception of the Weddell Sea coast, the low-elevation composites capture the regional precipitation and SMB variability as defined by the models. The central Antarctic sites lack coherency and either do not represent regional precipitation or indicate the model inability to capture relevant precipitation processes in the cold, dry central plateau. Our results show that SMB for the total Antarctic Ice Sheet (including ice shelves) has increased at a rate of 7 ± 0.13 Gt decade −1 since 1800 AD, representing a net reduction in sea level of ∼ 0.02 mm decade −1 since 1800 and ∼ 0.04 mm decade −1 since 1900 AD. The largest contribution is from the Antarctic Peninsula (∼ 75 %) where the annual average SMB during the most recent decade (2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)) is 123 ± 44 Gt yr −1 higher than the annual average during the first decade of the 19th century. Only four ice core records cover the full 1000 years, and they suggest a decrease in snow accumulation during this period. However, our study emphasizes the importance of low-elevation coastal zones, which have been under-represented in previous investigations of temporal snow accumulation.

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Preliminary results of the close-off depth and the stable isotopic records along a 109.91 m ice core from Dome A, Antarctica

Cited by 15 publications

References 36 publications

Uranium record from a 3 m snow pit at Dome Argus, East Antarctica

Uranium record from a 3 m snow pit at Dome Argus, East Antarctica

A synthesis of the Antarctic surface mass balance during the last 800 yr

Regional Antarctic snow accumulation over the past 1000 years

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