2015
DOI: 10.22456/1807-9806.78122
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Variações na composição isotópica de oxigênio na neve superficial ao longo de uma travessia antártica

Abstract: Este trabalho apresenta a variabilidade das razões de isótopos de oxigênio na neve superficial ao longo de uma travessia do manto de gelo da Antártida ocidental realizada no verão austral de 2004/2005 por uma expedição conjunta entre pesquisadores chilenos e brasileiros. A travessia foi realizada entre a estação chilena Tenente Parodi, em Patriot Hills (80°18’S, 081°21’W) e o Polo Sul geográfico, cobrindo uma distância de mais de 1.205 km. Foram coletadas amostras de neve superficial (entre 0,05 a 0,2 m de pro… Show more

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Cited by 3 publications
(9 citation statements)
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“…Katich et al (2017) managed to obtain nebulization efficiencies near 100 % with their equipment setup. We calculated the CWU Marin-5 nebulization efficiency to be 68.3±5.9 % (1σ ) based on the external calibration carried out every working day using Aquadag standards (Marquetto et al, 2020). We found a decrease in nebulization efficiency during the laboratory work period (−0.31 % per working day or −13.3 % over the 43 working days), but we assume the nebulization efficiency to remain stable between the measurement of the standard and the samples measured for the day, following Katich et al (2017).…”
Section: Rbc Analytical Methodsmentioning
confidence: 99%
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“…Katich et al (2017) managed to obtain nebulization efficiencies near 100 % with their equipment setup. We calculated the CWU Marin-5 nebulization efficiency to be 68.3±5.9 % (1σ ) based on the external calibration carried out every working day using Aquadag standards (Marquetto et al, 2020). We found a decrease in nebulization efficiency during the laboratory work period (−0.31 % per working day or −13.3 % over the 43 working days), but we assume the nebulization efficiency to remain stable between the measurement of the standard and the samples measured for the day, following Katich et al (2017).…”
Section: Rbc Analytical Methodsmentioning
confidence: 99%
“…Samples were melted at room temperature or in a tepid bath not exceeding 25 • C, sonicated for 15 min and then analyzed (in less than 1 h after melting). The resulting rBC concentrations using this subsampling method were compared to subsampling using a continuous melter system for the first 8 m of the core, and results for both methods were statistically the same (Marquetto et al, 2020).…”
Section: Sample Preparationmentioning
confidence: 99%
“…Durante a travessia, outros cinco testemunhos de gelo foram obtidos ( Fig. 1) os quais foram analisados por Bayer da Silva (2011), Hammes (2011), Marques (2012), Schwanck (2012), Marquetto (2013), Lindau (2014), Marques et al (2014), Schwanck et al (2014), Marquetto et al (2015) e Lindau et al (2016).…”
Section: 200mentioning
confidence: 99%
“…Marquetto et al (2015) analisaram a composição isotópica de oxigênio na neve superficial coletada ao longo da mesma travessia antártica em que se obteve o testemunho IC-02. O valor médio de ẟ 18 O do IC-02 é de -46,42‰, o qual se encontra no mesmo sítio de amostragem da neve superficial analisada por Marquetto et al (2015) que obteviram -49,1‰, valor relativo ao inverno de 2004.…”
Section: Fatores Geográficosunclassified
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