Prominent features in isotopic, chemical and dust stratigraphies from coastal East Antarctic ice sheet (Eastern Wilkes Land)

Caiazzo, Laura; Baccolo, Giovanni; Barbante, Carlo; Becagli, Silvia; Bertò, Michele; Ciardini, Virginia; Delmonte, Barbara; Dreossi, Giuliano; Frezzotti, Màssimo; Gabrieli, Jacopo; Giardi, Fabio; Han, Yeongcheol; Hong, Sungmin; Hur, Soon Do; Hwang, Heejin; Kang, Jung-Ho; Narcisi, Biancamaria; Proposito, Marco; Scarchilli, Claudio; Selmo, E.; Spolaor, Andrea; Stenni, Barbara; Udisti, Roberto

doi:10.1016/j.chemosphere.2017.02.115

Cited by 27 publications

(23 citation statements)

References 59 publications

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“…Preliminary models based on the snow accumulation rate and the snow density at the site predicted that the upper 500 m may span back in time more than 2000 years. The expected time resolution was about 2 yr m −1 at the surface, 4 yr m −1 at 50 m, and 6 yr m −1 at 500 m [20]. The drilling operations were carried out during the 2013/2014 Antarctic summer using an electromechanical drilling system (Eclipse Ice drill Instrument) which was able to extract a 247.2 m long core from the bottom of a snow pit down to a depth of 250.7 m.…”

Section: Introductionmentioning

confidence: 99%

Volcanic Fluxes Over the Last Millennium as Recorded in the Gv7 Ice Core (Northern Victoria Land, Antarctica)

et al. 2020

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Major explosive volcanic eruptions may significantly alter the global atmosphere for about 2–3 years. During that period, volcanic products (mainly H2SO4) with high residence time, stored in the stratosphere or, for shorter times, in the troposphere are gradually deposited onto polar ice caps. Antarctic snow may thus record acidic signals providing a history of past volcanic events. The high resolution sulphate concentration profile along a 197 m long ice core drilled at GV7 (Northern Victoria land) was obtained by Ion Chromatography on around 3500 discrete samples. The relatively high accumulation rate (241 ± 13 mm we yr −1) and the 5-cm sampling resolution allowed a preliminary counted age scale. The obtained stratigraphy covers roughly the last millennium and 24 major volcanic eruptions were identified, dated, and tentatively ascribed to a source volcano. The deposition flux of volcanic sulphate was calculated for each signature and the results were compared with data from other Antarctic ice cores at regional and continental scale. Our results show that the regional variability is of the same order of magnitude as the continental one.

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Section: Introductionmentioning

confidence: 99%

Volcanic Fluxes Over the Last Millennium as Recorded in the Gv7 Ice Core (Northern Victoria Land, Antarctica)

et al. 2020

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“…2). Although, the high concentration of nssCa 2+ could indicate the spring and summer season due to the mesoscale cyclonic activities (Caiazzo and others, 2017) and generally lithophile elements are influenced by the wind events in the Ross Sea region (Rhodes and others, 2012). Our result shows no distinguishable seasonal pattern for Ca 2+ , which thus cannot be used for age determination of the firn core.…”

Section: Resultsmentioning

confidence: 99%

“…Coupled with high cyclonic activities in the Ross Sea, mineral dusts (partial of K + , Mg 2+ and Ca 2+ ) showed an enhancement in spring and summer in northern Victoria Land (e.g. Caiazzo and others, 2017). This relates to the input from local ice-free areas as well as long-range transport from South America (Kreutz and others, 1999).…”

Section: Temporal Variations Of Ionic Compositionsmentioning

confidence: 99%

Chronological characteristics for snow accumulation on Styx Glacier in northern Victoria Land, Antarctica

et al. 2020

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Under the potential to reconstruct the past climatic and atmospheric conditions from a deep ice core in the coastal Antarctic site (Styx Glacier), an 8.84 m long firn core (73°50.975′ S, 163°41.640′ E; 1623 m a.s.l.) was initially studied to propose a reliable age scale for the local estimation of snow accumulation rate. The seasonal variations of δ18O, methanesulfonic acid (MSA) and non-sea-salt sulfate (nssSO42–) were used for the firn core dating and revealed 25 annual peaks (from 1990 to 2014) with volcanic sulfate signal. The observed declining trend in annual accumulation rate with a mean value of 146 ± 60 kg m–2 a–1 is likely to be linked to the changes of sea-ice extent in the Ross Sea region. Moreover, the temporal variation of the annual mean δ18O, an annual flux of MSA and nssSO42– also likely to be under the influence of ice-covered and open water area. This study suggests a potential to recover past changes in an oceanic environment and will be useful for the interpretation of the long ice core drilled at the same site.

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“…Following Mezgec et al [ 80 ] and Caiazzo et al [ 81 ], the whole domain is divided into a cells grid of 4° × 1° (long/lat) and number of points which each TJ spends within each cell was calculated. In order to consider only TJ able to load and transport aerosols, a threshold was applied counting TJ that spent almost 20% of the time (1 day) at heights between 100 and 1000 m. In Figure 5 , only TJ at heights 500 m, 1000 m, 1500 m, 2000 m were reported since most directly influencing particulate aerosol distribution during the study period.…”

Section: Methodsmentioning

confidence: 99%

Seasonal Evolution of Size-Segregated Particulate Mercury in the Atmospheric Aerosol Over Terra Nova Bay, Antarctica

et al. 2020

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Size-fractionated particulate mercury (PHg) measurements were performed from November 2017 to January 2018 at Terra Nova Bay (Antarctica) for the first time. Samples were collected every 10 days by a six-stage high-volume cascade impactor with size classes between 10 μm and 0.49 μm. Total PHg concentrations were maxima (87 ± 8 pg m−3) in November, then decreased to values ~40% lower and remained almost constant until the end of the sampling period (~30 pg m−3). The trimodal aerosol mass distribution reveals that from 30% to 90% of the total PHg came in the size > 1.0 μm. Hg in the two coarse fractions was probably produced by the adsorption of oxidized Hg species transported by air masses from the Antarctic plateau or produced locally by sea ice edges. PHg in accumulation mode seemed to be related to gas–particle partitioning with sea salt aerosol. Finally, average dry deposition fluxes of PHg were calculated to be 0.36 ± 0.21 ng m−2 d−1 in the accumulation mode, 47 ± 44 ng m−2 d−1 in the first coarse mode, and 37 ± 31 ng m−2 d−1 in the second coarse mode. The present work contributed to the comprehension of the Hg biogeochemical cycle, but further research studies are needed.

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Prominent features in isotopic, chemical and dust stratigraphies from coastal East Antarctic ice sheet (Eastern Wilkes Land)

Cited by 27 publications

References 59 publications

Volcanic Fluxes Over the Last Millennium as Recorded in the Gv7 Ice Core (Northern Victoria Land, Antarctica)

Volcanic Fluxes Over the Last Millennium as Recorded in the Gv7 Ice Core (Northern Victoria Land, Antarctica)

Chronological characteristics for snow accumulation on Styx Glacier in northern Victoria Land, Antarctica

Seasonal Evolution of Size-Segregated Particulate Mercury in the Atmospheric Aerosol Over Terra Nova Bay, Antarctica

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