High-resolution 900 year volcanic and climatic record from the Vostok area, East Antarctica

Osipov, E. Yu.; Ходжер, Т. В.; Голобокова, Л. П.; Онищук, Н. А.; Lipenkov, V. Ya.; Ekaykin, Alexey; Shibaev, Yu. A.; Осипова, О. П.

doi:10.5194/tc-8-843-2014

Cited by 16 publications

(23 citation statements)

References 30 publications

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“…In any case, no comparison with radar data is possible because of corresponding reflectors too close to the upper surface to be detected. More generally, other studies along the East Antarctica Ice Divide (Dome C, Vostok and Dome Fuji) suggest similar increases of surface mass balance during the last century (Urbini et al, 2008;Fujita et al, 2011;Frezzotti et al, 2013;Osipov et al, 2014). If the results proposed here appear consistent with these studies, their associated uncertainties unfortunately remain too large (even after being diminished by the time-independent biases) to serve as incontrovertible evidence of a significant time increase in the accumulation rates.…”

Section: Time Dependency Of Accumulationmentioning

confidence: 43%

Spatial and temporal distributions of surface mass balance between Concordia and Vostok stations, Antarctica, from combined radar and ice core data: first results and detailed error analysis

et al. 2018

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Abstract. Results from ground-penetrating radar (GPR) measurements and shallow ice cores carried out during a scientific traverse between Dome Concordia (DC) and Vostok stations are presented in order to infer both spatial and temporal characteristics of snow accumulation over the East Antarctic Plateau. Spatially continuous accumulation rates along the traverse are computed from the identification of three equally spaced radar reflections spanning about the last 600 years. Accurate dating of these internal reflection horizons (IRHs) is obtained from a depth–age relationship derived from volcanic horizons and bomb testing fallouts on a DC ice core and shows a very good consistency when tested against extra ice cores drilled along the radar profile. Accumulation rates are then inferred by accounting for density profiles down to each IRH. For the latter purpose, a careful error analysis showed that using a single and more accurate density profile along a DC core provided more reliable results than trying to include the potential spatial variability in density from extra (but less accurate) ice cores distributed along the profile. The most striking feature is an accumulation pattern that remains constant through time with persistent gradients such as a marked decrease from 26 mm w.e. yr−1 at DC to 20 mm w.e. yr−1 at the south-west end of the profile over the last 234 years on average (with a similar decrease from 25 to 19 mm w.e. yr−1 over the last 592 years). As for the time dependency, despite an overall consistency with similar measurements carried out along the main East Antarctic divides, interpreting possible trends remains difficult. Indeed, error bars in our measurements are still too large to unambiguously infer an apparent time increase in accumulation rate. For the proposed absolute values, maximum margins of error are in the range 4 mm w.e. yr−1 (last 234 years) to 2 mm w.e. yr−1 (last 592 years), a decrease with depth mainly resulting from the time-averaging when computing accumulation rates.

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Section: Time Dependency Of Accumulationmentioning

confidence: 43%

Spatial and temporal distributions of surface mass balance between Concordia and Vostok stations, Antarctica, from combined radar and ice core data: first results and detailed error analysis

et al. 2018

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“…Again, comparing the time dependency of our results with those from other studies suffers from the lack of correspondence between the averaged periods. Osipov et al (2014) and Fujita et al the Antarctic plateau during the last millennium. More specifically, a correlation between climate and accumulation changes seems to emerge from most studies cited in (Osipov et al, 2014) and according to which the slightly decreased temperatures during the Little Ice Age led to a corresponding decrease in accumulation rate.…”

Section: Interpretation In the Frame Of Remote Studied Areasmentioning

confidence: 94%

“…Osipov et al (2014) and Fujita et al the Antarctic plateau during the last millennium. More specifically, a correlation between climate and accumulation changes seems to emerge from most studies cited in (Osipov et al, 2014) and according to which the slightly decreased temperatures during the Little Ice Age led to a corresponding decrease in accumulation rate. However, not only is the timing significantly different from one lo-725 cation to the other, but some places have undergone inverse trends such as Siple or Vostok where, for example, the CE 1261-1601 lower accumulation period (-12% compared to the CE 1260-2010 average) was followed by a 13% increase between CE 1661 and 1815.…”

Section: Interpretation In the Frame Of Remote Studied Areasmentioning

confidence: 94%

Spatial and temporal distributions of surface mass balance between Concordia and Vostok stations, Antarctica from combined radar and ice core data: First results and detailed error analysis

Meur¹,

Magand²,

Arnaud³

et al. 2017

Preprint

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Abstract. Results from Ground Penetrating Radar (GPR) measurements and shallow ice cores carried out during a scientific traverse between Dome Concordia (DC) and Vostok stations are presented in order to infer both spatial and temporal characteristics of snow accumulation over the East Antarctic plateau. Spatially continuous accumulation rates along the traverse are computed from the identification of three equally spaced radar reflections spanning about the last 600 yr. Accurate dating of these Internal Reflection Horizons (IRHs) is obtained from a depth-age relationship derived from volcanic horizons and bomb testing fallout on a DC ice core and shows a very good consistency when tested against extra ice cores drilled along the radar profile. Accumulation rates are then inferred by accounting for density profiles down to each IRH. For this latter purpose, a careful error analysis showed that using a single and more accurate density profile along a DC core provided more reliable results than trying to include the potential spatial variability in density from extra (but less accurate) ice cores distributed along the profile. The most striking feature is an accumulation pattern that remains constant through time with persistent gradients such as a marked decrease from 26 mm w.e. yr−1 at DC to 20 mm w.e. yr−1 at the South West end of the profile over the last 234 yr average (with a similar decrease from 25 mm w.e. yr−1 to 19 mm w.e. yr−1 over the last 592 yr). Insights into the time-dependency reveal a steady increase of accumulation on the East Antarctic plateau during the last 600 yr and more particularly since about 200 yr as already suggested by previous studies relying on GPR and/or time markers in ice cores. Maximum margins of error are in the range 4 mm w.e. yr−1 (last 234 yr) to 2 mm w.e. yr−1 (last 592 yr), a decrease with depth mainly resulting from the time-averaging when computing accumulation rates. The gradients proposed in this study remain however significant since only the reduced non systematic component (with regard to space or time) of these error terms has to be considered when interpreting spatial or temporal trends.

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“…Концентрацию главных ионов измеряли методом ионной хроматогра фии . Методика подготовки проб и аналитиче ских измерений изложена в наших исследова ниях [6][7][8] . В настоящей работе использованы только данные по Na + .…”

Section: Location Of Sampling Sites (Cores and Snow Pits) In East Aunclassified

“…В качестве вул канических сигналов мы использовали пики неморского сульфата . Методика выявления сульфатных пиков, соответствующих вулканиче ским событиям, детально изложена в работе [8] . Продолжительность исследованных времен ных рядов (Na + ) составляет от 26 (SW42) до 374 лет (сводный ряд V st ) .…”

Section: Location Of Sampling Sites (Cores and Snow Pits) In East Aunclassified

Atmospheric circulation in the Indian Ocean sector of East Antarctica over the last 200 years according to chemical studies of snow‑firn cover

Осипов¹,

Осипова²,

Голобокова³

et al. 2017

Lëd i sneg

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SummarySpatial and temporal variability of a sea-salt aerosol (Na + ) concentration was investigated in snow-firn cores and snow pits taken at four sites of the Indian Ocean sector of the East Antarctica (along a profile between stations Progress and Vostok: PV-10, NVFL-1, SW-42, and the Vostok point). In long annually resolved Na + records, we had revealed the following periodicities: 17 to 95-year (Vostok) and 29 to 52-year (NVFL-1), while the shorter records are characterized by 8-year periodicity. The Na + concentrations decrease as the snow accumulation increases (especially, at the Vostok station), and this is evidence for a presence of «dilution effect» in the sites with the great part of «dry precipitation». The closest relationship was revealed between changes in flows of Na + at points SW-42, and PV-10. Variability of the Na + fluxes had been linked to the circulation indices (AAO, PDO, SOI, MEI, SPO) and the sea level pressure in the Southern Hemisphere, as well as to occurrence of Elementary Circulation Mechanisms (ECM). The revealed irregularity of the Na + precipitation over the area under investigation is caused by different atmospheric circulation patterns as well as by influence of basic Action Centers of the Atmosphere (ACA) in the Southern Hemisphere. The closest relationship is found to take place with South Pacific ACA (Vostok, 1976(Vostok, -2009 and with the South Indian ACA (SW-42 and PV-10). A presence of distant atmospheric relations (including one with El Nino) had been revealed for the inland areas. Changes in features of the atmospheric circulation in the South Indian Ocean over the last 200-year period have been reconstructed on the basis of summarized Na + records from the Vostok station area. Distinctive feature of the atmospheric circulation is the 40-year periodicity with its increasing intensity during the following periods: 1805-1820, 1830-1860, 1890-1900, 1940-1950, and 1980-2000. In addition, we had revealed that changes in the atmospheric circulation in the Indian Ocean (Southern Hemisphere) were synchronous with similar variability of the circulation in the Siberian (Northern Hemisphere) sector. Ключевые слова: Антарктида, атмосферная циркуляция, натрий, реконструкция климата, снежно-фирновые керны. По данным изучения химического состава снежно-фирнового покрова в индоокеанском секторе Восточной Антарктиды установлены пространственно-временные изменения аккумуляции мор-ского аэрозоля (Na + ). Исследованы корреляционные связи аккумуляции Na + с индексами цирку-ляции и полем давления Южного полушария, а также элементарными циркуляционными меха-низмами. Впервые выполнена реконструкция интенсивности региональной циркуляции за последние 200 лет. В статье используются следующие сокращения:САК -СевероАтлантическое колебание ЦДА -центр действия атмосферы ЦПВ -циркумполярный вихрь ЭЦМ -элементарные циркуляционные механизмы ЮПК -ЮжноПолярное колебание

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High-resolution 900 year volcanic and climatic record from the Vostok area, East Antarctica

Cited by 16 publications

References 30 publications

Spatial and temporal distributions of surface mass balance between Concordia and Vostok stations, Antarctica, from combined radar and ice core data: first results and detailed error analysis

Spatial and temporal distributions of surface mass balance between Concordia and Vostok stations, Antarctica, from combined radar and ice core data: first results and detailed error analysis

Spatial and temporal distributions of surface mass balance between Concordia and Vostok stations, Antarctica from combined radar and ice core data: First results and detailed error analysis

Atmospheric circulation in the Indian Ocean sector of East Antarctica over the last 200 years according to chemical studies of snow‑firn cover

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