Assessment of Surface Pressure between Zhongshan and Dome a in East Antarctica from Different Meteorological Reanalyses

Abstract. Antarctic ice core nitrate (NO3-) can provide a unique record of the atmospheric reactive nitrogen cycle. However, the factors influencing the deposition and preservation of NO3- at the ice sheet surface must first be understood. Therefore, an intensive program of snow and atmospheric sampling was made on a traverse from the coast to the ice sheet summit, Dome A, East Antarctica. Snow samples in this observation include 120 surface snow samples (top ∼ 3 cm), 20 snow pits with depths of 150 to 300 cm, and 6 crystal ice samples (the topmost needle-like layer on Dome A plateau). The main purpose of this investigation is to characterize the distribution pattern and preservation of NO3- concentrations in the snow in different environments. Results show that an increasing trend of NO3- concentrations with distance inland is present in surface snow, and NO3- is extremely enriched in the topmost crystal ice (with a maximum of 16.1 µeq L−1). NO3- concentration profiles for snow pits vary between coastal and inland sites. On the coast, the deposited NO3- was largely preserved, and the archived NO3- fluxes are dominated by snow accumulation. The relationship between the archived NO3- and snow accumulation rate can be depicted well by a linear model, suggesting a homogeneity of atmospheric NO3- levels. It is estimated that dry deposition contributes 27–44 % of the archived NO3- fluxes, and the dry deposition velocity and scavenging ratio for NO3- were relatively constant near the coast. Compared to the coast, the inland snow shows a relatively weak correlation between archived NO3- and snow accumulation, and the archived NO3- fluxes were more dependent on concentration. The relationship between NO3- and coexisting ions (nssSO42-, Na+ and Cl−) was also investigated, and the results show a correlation between nssSO42- (fine aerosol particles) and NO3- in surface snow, while the correlation between NO3- and Na+ (mainly associated with coarse aerosol particles) is not significant. In inland snow, there were no significant relationships found between NO3- and the coexisting ions, suggesting a dominant role of NO3- recycling in determining the concentrations.

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Identification of multiple natural and anthropogenic sources of dust in snow from Zhongshan Station to Dome A, East Antarctica

Journal of Glaciology ◽

10.1017/jog.2018.72 ◽

2018 ◽

Vol 64 (248) ◽

pp. 855-865 ◽

Cited By ~ 8

Author(s):

ZHIHENG DU ◽

CUNDE XIAO ◽

MINGHU DING ◽

CHUANJIN LI

Keyword(s):

Major Ions ◽

Isotope Composition ◽

Isotopic Signature ◽

East Antarctica ◽

Anthropogenic Sources ◽

Dome A ◽

Long Distance ◽

Anthropogenic Pollutants ◽

Zhongshan Station ◽

Snow Samples

ABSTRACTThe stable oxygen isotope composition, major ions and isotopic compositions of strontium (Sr), neodymium (Nd) and lead (Pb) in insoluble dust from recent surface snow samples along the transect from the Zhongshan and Progress stations (located on the Amery Ice Shelf, East Antarctica) to Dome A (Summit, Antarctica) were analysed. No previous isotopic fingerprinting studies have been conducted for this transect. These data were used to document the dust provenances in Antarctica along the transect up to the highest site, Dome A, for the first time. The insoluble dust in snow samples along the coast displays an overall crust-line isotopic signature that is characterised by highly radiogenic 87Sr/86Sr values and less radiogenic 143Nd/144Nd values. These signatures are comparable with those of samples collected near the ice-free areas of the Zhongshan and Progress stations. Spatial differences are statistically significant along the transect, and the Sr, Nd and Pb isotope components in insoluble dust from two continuous snow samples at Dome A exhibit marked differences, indicating that additional dust reaches the East Antarctic Plateau. The isotopic characteristics of insoluble dust from this transect indicate that the long-distance natural dust and anthropogenic pollutants in these samples primarily originate from Australia.

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A revised inventory of Antarctic subglacial lakes

Antarctic Science ◽

10.1017/s0954102005002889 ◽

2005 ◽

Vol 17 (3) ◽

pp. 453-460 ◽

Cited By ~ 201

Author(s):

MARTIN J. SIEGERT ◽

SASHA CARTER ◽

IGNAZIO TABACCO ◽

SERGEY POPOV ◽

DONALD D. BLANKENSHIP

Keyword(s):

East Antarctica ◽

Large Lake ◽

Dome A ◽

Lake Vostok ◽

The Third ◽

The Us ◽

Radio Echo Sounding ◽

Subglacial Lakes ◽

Lake Type ◽

Echo Sounding

The locations and details of 145 Antarctic subglacial lakes are presented. The inventory is based on a former catalogue of lake-type features, which has been subsequently reanalysed, and on the results from three additional datasets. The first is from Italian radio-echo sounding (RES) of the Dome C region of East Antarctica, from which 14 new lakes are identified. These data also show that, in a number of occasions, multiple lake-type reflectors thought previously to be individual lakes are in fact reflections from the same relatively large lake. This reduces the former total of lake-type reflectors by six, but also adds a significant level of information to these particular lakes. The second dataset is from a Russian survey of the Dome A and Dome F regions of East Antarctica, which provides evidence of 18 new lakes and extends the coverage of the inventory considerably. The third dataset comprises three airborne RES surveys undertaken by the US in East Antarctica over the last five years, from which forty three new lakes have been identified. Reference to information on Lake Vostok, from Italian and US surveys taken in the last few years, is now included.

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Culturable bacteria isolated from snow cores along the 1300 km traverse from Zhongshan Station to Dome A, East Antarctica

Extremophiles ◽

10.1007/s00792-012-0434-3 ◽

2012 ◽

Vol 16 (2) ◽

pp. 345-354 ◽

Cited By ~ 9

Author(s):

Peiying Yan ◽

Shugui Hou ◽

Tuo Chen ◽

Xiaojun Ma ◽

Shuhong Zhang

Keyword(s):

East Antarctica ◽

Culturable Bacteria ◽

Dome A ◽

Zhongshan Station

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Structure of the internal isochronous layers at Dome A, East Antarctica

Science China Earth Sciences ◽

10.1007/s11430-010-4065-1 ◽

2010 ◽

Vol 54 (3) ◽

pp. 445-450 ◽

Cited By ~ 5

Author(s):

XueYuan Tang ◽

Bo Sun ◽

ZhanHai Zhang ◽

XiangPei Zhang ◽

XiangBin Cui ◽

...

Keyword(s):

East Antarctica ◽

Dome A

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Supplementary material to "Spatial and temporal variations in snow chemistry along a traverse from coastal East Antarctica to the ice sheet summit (Dome A)"

10.5194/tc-2020-255-supplement ◽

2020 ◽

Author(s):

Guitao Shi ◽

Hongmei Ma ◽

Zhengyi Hu ◽

Zhenlou Chen ◽

Chunlei An ◽

...

Keyword(s):

Ice Sheet ◽

Temporal Variations ◽

East Antarctica ◽

Spatial And Temporal Variations ◽

Dome A ◽

Snow Chemistry ◽

Supplementary Material

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Internal layering structure and subglacial conditions along a traverse line from Zhongshan Station to Dome A, East Antarctica, revealed by ground-based radar sounding

Applied Geophysics ◽

10.1007/s11770-020-0866-y ◽

2020 ◽

Vol 17 (5-6) ◽

pp. 870-878

Author(s):

Xue-Yuan Tang ◽

Bo Sun ◽

Tian-Tian Wang

Keyword(s):

East Antarctica ◽

Dome A ◽

Zhongshan Station

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Spatio-temporal variability of past accumulation rates inferred from isochronous layers at Dome A, East Antarctica

Annals of Glaciology ◽

10.1017/aog.2016.28 ◽

2016 ◽

Vol 57 (73) ◽

pp. 87-93 ◽

Cited By ~ 1

Author(s):

Tiantian Wang ◽

Bo Sun ◽

Xueyuan Tang ◽

Xiaoping Pang ◽

Xiangbin Cui ◽

...

Keyword(s):

Ice Core ◽

Temporal Variations ◽

East Antarctica ◽

Accumulation Rates ◽

Dome A ◽

High Accumulation ◽

The Past ◽

Ice Accumulation ◽

Radio Echo Sounding ◽

Spatio Temporal

ABSTRACTStudies of palaeo-accumulation rates at Dome A, East Antarctica, are entirely absent. Here, spatio-temporal variations in ice accumulation rates for the past ~161 ka are calculated from isochronous internal layering, traced from radio-echo sounding (RES) data collected by the Polar Research Institute of China (PRIC) during the 21st CHINARE. The layers are dated by linking them to the site of Vostok ice core along an RES profile, which was flown by the Alfred-Wegener-Institut (AWI) in the Dome Connection East Antarctica (DoCo) project. The Dansgaard-Johnsen model is used to determine the spatial and temporal pattern of ice accumulation in Dome A region. The results show that there is a slight increasing pattern of ice accumulation from south to north along the 216 km radar profile at Dome A. The lowest ice accumulation rates were calculated around the Dome A zone. In the past ~90 ka, there were relatively high accumulation rates during the time period 34–47 ka (Marine Isotope Stage 3) at Dome A.

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