scholarly journals Supplementary material to "Brief communication: Organochlorine pesticides in an archived firn core from Law Dome, East Antarctica"

2016 ◽  
Author(s):  
Marie Bigot ◽  
Mark A. J. Curran ◽  
Andrew D. Moy ◽  
Derek C. G. Muir ◽  
Darryl W. Hawker ◽  
...  
Keyword(s):  
Organochlorine Pesticides ◽  
East Antarctica ◽  
Supplementary Material ◽  
Firn Core

scholarly journals Brief communication: Organochlorine pesticides in an archived firn core from Law Dome, East Antarctica

2016 ◽  
Vol 10 (5) ◽  
pp. 2533-2539 ◽  
Author(s):  
Marie Bigot ◽  
Mark A. J. Curran ◽  
Andrew D. Moy ◽  
Derek C. G. Muir ◽  
Darryl W. Hawker ◽  
...  
Keyword(s):  
Organochlorine Pesticides ◽  
Nitrogen Atmosphere ◽  
East Antarctica ◽  
Polar Regions ◽  
Deposition Rates ◽  
The Core ◽  
Arctic Regions ◽  
First Time ◽  
Trace Organic ◽  
Firn Core

Abstract. Organochlorine pesticides (OCPs) were, for the first time, quantified in archived firn cores from East Antarctica representative of 1945–1957 and 1958–1967 (current era, C.E.). The core sections were melted under high-purity nitrogen atmosphere, and the meltwater was analysed. Methods allowed quantification of hexachlorocyclohexanes, heptachlor, trans-chlordane, dieldrin and endrin. While the core presented evidence of nominal contamination by modern-use chemicals, indicating handling and/or storage contamination, legacy OCP concentrations and deposition rates reported are orders of magnitude lower than those from Arctic regions, lending support for their validity. The study further provides a description of equipment used and suggests methods to overcome logistical challenges associated with trace organic contaminant detection in polar regions.

First glaciological investigations at Ridge B, central East Antarctica

2021 ◽  
pp. 1-10
Author(s):  
Alexey A. Ekaykin ◽  
Alexey V. Bolshunov ◽  
Vladimir Ya. Lipenkov ◽  
Mirko Scheinert ◽  
Lutz Eberlein ◽  
...  
Keyword(s):  
East Antarctica ◽  
Snow Density ◽  
Deep Drilling ◽  
Surface Mass ◽  
Annual Variations ◽  
First Results ◽  
Vostok Station ◽  
Water Stable Isotope ◽  
Isotope Content ◽  
Firn Core

Abstract The region of Ridge B in central East Antarctica is one of the last unexplored parts of the continent and, at the same time, ranks among the most promising places to search for Earth's oldest ice. In January 2020, we carried out the first scientific traverse from Russia's Vostok Station to the topographical dome of Ridge B (Dome B, 3807 m above sea level, 79.02°S, 93.69°E). The glaciological programme included continuous snow-radar profiling and geodetic positioning along the traverse's route, installation of snow stakes, measurements of snow density, collection of samples for stable water isotope and chemical analyses and drilling of a 20 m firn core. The first results of the traverse show that the surface mass balance at Dome B (2.28 g cm−2 year−1) is among the lowest in Antarctica. The firn temperature below the layer of annual variations is −58.1 ± 0.2°C. A very low value of heavy water stable isotope content (-58.2‰ for oxygen-18) was discovered at a distance of 170 km from Vostok Station. This work is the first step towards a comprehensive reconnaissance study of the Ridge B area aimed at locating the best site for future deep drilling for the oldest Antarctic ice.

Supplementary material to "Retention time of lakes in the Larsemann Hills oasis, East Antarctica"

2020 ◽  
Author(s):  
Elena Shevnina ◽  
Ekaterina Kourzeneva ◽  
Yury Dvornikov ◽  
Irina Fedorova
Keyword(s):  
Retention Time ◽  
East Antarctica ◽  
Larsemann Hills ◽  
Supplementary Material

scholarly journals 60 years record of biogenic sulfur from Lambert Glacier basin firn core, East Antarctica

2002 ◽  
Vol 35 ◽  
pp. 362-367 ◽  
Author(s):  
Sun Junying ◽  
Ren Jiawen ◽  
Qin Dahe
Keyword(s):  
Sampling Site ◽  
East Antarctica ◽  
Bottom Part ◽  
South Indian ◽  
Indian Ocean Sector ◽  
Western Side ◽  
Ocean Sector ◽  
Lambert Glacier ◽  
Firn Core ◽  
Lambert Glacier Basin

AbstractA 15.2 m deep firn core and a 2.7 m snow pit were drilled in the western side of Lambert Glacier basin, East Antarctica, in January 1993. the sampling site LGB16 (72.8˚ S, 57.3˚ E) is located about 650 km from the coast, at approximately 2690ma.s.l. the concentration of methanesulfonate (MSA) was determined in the firn core and snow pit. the continuous MSA record from LGB16, spanning about 60 years from 1933 to 1992, displays a decreasing trend in general, and sharp differences between the upper 10.2 m (corresponding to AD 1952) and the bottom part from 10.2 to 15.2 m. the mean MSA concentration for the whole core is 11.3±14.5 ng g–1; for the upper 10.2 m it is 9.3 ±6.3 ng g–1, compared to 15.4±23.0 ng g–1 for the bottom part. the bottom part has a greater number of high MSA peaks, which is consistent with the Cl– and, to a lesser extent, Na+ records for this core. A negative correlation was observed between sea-ice area for the South Indian Ocean sector (40–90˚E) and MSA concentration in LGB16. No significant link was observed between the high MSA concentration and El Niño events at this location.

250 years of accumulation, oxygen isotope and chemical records in a firn core from Princess Elizabeth Land, East Antarctica

2006 ◽  
Vol 16 (1) ◽  
pp. 23-33 ◽  
Author(s):  
Mingjun Zhang ◽  
Zhongqin Li ◽  
Jiawen Ren ◽  
Cunde Xiao ◽  
Dahe Qin ◽  
...  
Keyword(s):  
Oxygen Isotope ◽  
East Antarctica ◽  
Firn Core

scholarly journals Sea ice-related halogen enrichment at Law Dome, coastal East Antarctica

2016 ◽  
Author(s):  
Paul Vallelonga ◽  
Niccolo Maffezzoli ◽  
Andrew D. Moy ◽  
Mark A. J. Curran ◽  
Tessa R. Vance ◽  
...  
Keyword(s):  
Sea Ice ◽  
20Th Century ◽  
East Antarctica ◽  
Austral Spring ◽  
High Accumulation ◽  
Low Levels ◽  
The Law ◽  
Western Side ◽  
The Antarctic ◽  
Firn Core

Abstract. The Law Dome site is ideal for the evaluation of sea ice proxies due to its location near to the Antarctic coast, regular and high accumulation throughout the year, an absence of surface melting or remobilization, and minimal multiyear sea ice. We present records of bromine and iodine concentrations and their enrichment beyond seawater compositions, arguing that halogen enrichment is indicative of the local sea ice area, particularly the 90–110° E sector of the Wilkes coast. Our findings support the results of previous studies of sea ice variability from Law Dome, indicating that Wilkes coast sea ice area is currently at its lowest level since the start of the 20th century. From the Law Dome DSS1213 firn core, 26 years of monthly deposition data indicate that the period of peak bromine enrichment is during Austral spring-summer, from November to February. Results from a traverse along the lee (Western) side of Law Dome show low levels of sodium and bromine deposition, with the greatest fluxes in the vicinity of the Law Dome summit. Finally, iodine enrichment is well correlated to that of bromine, indicating a common, sea ice source for their enrichment.

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