Subglacial Lake Vostok not expected to discharge water

Richter, Andreas; Попов, С. В.; Schröder, Ludwig; Schwabe, Joachim; Ewert, Heiko; Scheinert, Mirko; Horwath, Martin; Dietrich, Reinhard

doi:10.1002/2014gl061433

Cited by 12 publications

(14 citation statements)

References 28 publications

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“…This contradicts the results of this study, but also those of two independent data sets in Richter et al (2014a), i.e. static GNSS observations and kinematic GNSS profiles using snow mobiles (compare Richter et al, 2016). It is interesting to note, however, that the trends implied by our laser campaign biases and those of Zwally et al (2015) differ by 2.11 cm yr −1 .…”

Section: Icesatcontrasting

confidence: 99%

“…Hence this also explains the disparity between their ICESat-derived mass budget and the massbalance estimates of many other studies (e.g. Shepherd et al, 2012;McMillan et al, 2014;Martin-Espanol et al, 2016), especially in East Antarctica as documented in Scambos and Shuman (2016) and Richter et al (2016). Urban et al (2013) (as updated in Scambos andShuman, 2016) obtained significantly smaller biases using the global ocean as a reference surface.…”

Section: Icesatmentioning

confidence: 82%

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Schröder¹

2017

Preprint

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Ice-surface elevation profiles of more than 30 000 km in total length are derived from kinematic GNSS (GPS and the Russian GLONASS) observations on sledge convoy vehicles along traverses between Vostok Station and the East Antarctic coast. These profiles have accuracies between 4 and 9 cm. They are used to validate elevation data sets from both radar and laser satellite altimetry as well as four digital elevation models. A crossover analysis with three different processing versions of Envisat radar altimetry elevation profiles yields a clear preference for the relocation method over the direct method of slope correction and for threshold retrackers over functional fit algorithms. The validation of CryoSat-2 low-resolution mode and SARIn mode data sets documents the progress made from baseline B to C elevation products. ICESat laser altimetry data are demonstrated to be accurate to a few decimetres over a wide range of surface slopes. A crossover adjustment in the region of subglacial Lake Vostok combining ICESat elevation data with our GNSS profiles yields a new set of ICESat laser campaign biases and provides new, independent evidence for the stability of the ice-surface elevation above the lake. The evaluation of the digital elevation models reveals the benefits of combining laser and radar altimetry.Published by Copernicus Publications on behalf of the European Geosciences Union.

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Section: Icesatcontrasting

confidence: 99%

Section: Icesatmentioning

confidence: 82%

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Schröder¹

2017

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“…Over a 6-year period, a system for clean, hot-water drilling and an accompanying miniature remote operating vehicle was developed and tested for the Lake Whillans project 120,122 . Unlike Lake Vostok, which is not expected to discharge water 123 and has a mean water residence time of ~13,000 years 124 , Lake Whillans is connected by active streams 125,126 and has a mean water residence time of ~10 years 122 . Although compounding problems exist for the exploration of Lake Vostok, they have been greatly minimized for the Lake Whillans project.…”

Section: Box 2 | Subglacial Lakesmentioning

confidence: 99%

Microbial ecology of Antarctic aquatic systems

2015

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The Earth's biosphere is dominated by cold environments, and the cold biosphere is dominated by microorganisms. Microorganisms in cold Southern Ocean waters are recognized for having crucial roles in global biogeochemical cycles, including carbon sequestration, whereas microorganisms in other Antarctic aquatic biomes are not as well understood. In this Review, I consider what has been learned about Antarctic aquatic microbial ecology from 'omic' studies. I assess the factors that shape the biogeography of Antarctic microorganisms, reflect on some of the unusual biogeochemical cycles that they are associated with and discuss the important roles that viruses have in controlling ecosystem function.

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“…The spread of the values is very likely a result of the remaining uncertainties of the antenna height reduction in the GNSS profiles. Interannual variations in accumulation (Ekaykin et al, 2004, σ < 5 mm yr −1 ) or a water discharge from Lake Vostok (Richter et al, 2014b) can be ruled out as possible causes. Due to the long temporal base, those data sets nevertheless allow a precise trendḣ of −0.4 ± 0.4 cm yr −1 to be derived.…”

Section: Icesatmentioning

confidence: 99%

Validation of satellite altimetry by kinematic GNSS in central East Antarctica

Schröder

Richter

Fedorov³

et al. 2017

The Cryosphere

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Abstract. Ice-surface elevation profiles of more than 30 000 km in total length are derived from kinematic GNSS (GPS and the Russian GLONASS) observations on sledge convoy vehicles along traverses between Vostok Station and the East Antarctic coast. These profiles have accuracies between 4 and 9 cm. They are used to validate elevation data sets from both radar and laser satellite altimetry as well as four digital elevation models. A crossover analysis with three different processing versions of Envisat radar altimetry elevation profiles yields a clear preference for the relocation method over the direct method of slope correction and for threshold retrackers over functional fit algorithms. The validation of CryoSat-2 low-resolution mode and SARIn mode data sets documents the progress made from baseline B to C elevation products. ICESat laser altimetry data are demonstrated to be accurate to a few decimetres over a wide range of surface slopes. A crossover adjustment in the region of subglacial Lake Vostok combining ICESat elevation data with our GNSS profiles yields a new set of ICESat laser campaign biases and provides new, independent evidence for the stability of the ice-surface elevation above the lake. The evaluation of the digital elevation models reveals the benefits of combining laser and radar altimetry.

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Subglacial Lake Vostok not expected to discharge water

Cited by 12 publications

References 28 publications

Reply to referee comment from reviewer #1

Reply to referee comment from reviewer #1

Microbial ecology of Antarctic aquatic systems

Validation of satellite altimetry by kinematic GNSS in central East Antarctica

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