Examinando por Autor "Hirabayashi, Motohiro"

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    Black carbon effects and seasonal isotope records in the Godwin‑Austen snowpack and K2 high-altitude camps
    (Cambridge University Press, 0025) González-Santacruz, Nicolás; Fernandoy, Francisco; Goto-Azuma, Kumiko; Hirabayashi, Motohiro; Cordero, Raúl; Feron, Sarah; Faria, Sérgio Henrique
    This study investigates black carbon (BC) concentrations in the seasonal snowpack on the Godwin-Austen Glacier and in surface snow at K2 Camps 1 and 2 (Karakoram Range), assessing their impact on snowmelt during the 2019 ablation season. Potential BC and moisture sources were identified through back-trajectory analysis and atmospheric reanalyses. Variations in water stable isotopes (δ18O and δ2H) in the snowpack were analysed to confirm its representativeness as a climatic record for the 2018–19 accumulation season. The average BC concentration in the snowpits (12 ng g-1) generated 66 mm w.e. (or 53 mm w.e. excluding the basal zone) of meltwater. Surface snow at K2 Camp 1 showed BC concentrations of 7 ng g-1, consistent with those on the snowpack surface, suggesting it may reflect local BC levels in late February 2019. In contrast, higher concentrations at K2 Camp 2 (26 ng g-1) were potentially linked to expedition activities. © 2025 Cambridge University Press. All rights reserved.
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    Black carbon effects and seasonal isotope records in the Godwin‑Austen snowpack and K2 high-altitude camps
    (Journal of Glaciology, 2025, 2025) González-Santacruz, Nicolás; Fernandoy, Francisco b; Goto-Azuma, Kumiko; Hirabayashi, Motohiro; Cordero, Raúl; Feron, Sarah; Faria, Sérgio Henrique
    This study investigates black carbon (BC) concentrations in the seasonal snowpack on the Godwin-Austen Glacier and in surface snow at K2 Camps 1 and 2 (Karakoram Range), assessing their impact on snowmelt during the 2019 ablation season. Potential BC and moisture sources were identified through back-trajectory analysis and atmospheric reanalyses. Variations in water stable isotopes (δ18O and δ2H) in the snowpack were analysed to confirm its representativeness as a climatic record for the 2018–19 accumulation season. The average BC concentration in the snowpits (12 ng g-1) generated 66 mm w.e. (or 53 mm w.e. excluding the basal zone) of meltwater. Surface snow at K2 Camp 1 showed BC concentrations of 7 ng g-1, consistent with those on the snowpack surface, suggesting it may reflect local BC levels in late February 2019. In contrast, higher concentrations at K2 Camp 2 (26 ng g-1) were potentially linked to expedition activities. © 2025 Cambridge University Press. All rights reserved.