Seasonal variability of isotopes and chemistry in a coastal firn core from the Amundsen Sea, West Antarctica
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Title
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Seasonal variability of isotopes and chemistry in a coastal firn core from the Amundsen Sea, West Antarctica
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Authors
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Shin, Jinhwa
Han, Yeongcheol
Hong, Sang-Bum
Jung, HyeJin
Chang, Chaewon
Moon, Jangil
Kim, Minjeong
Bong, Hayoung
Yoshimura, Kei
Lee, Jaeseok
Lee, Seungmi
Ro, Seokhyun
Kim, Songyi
Hur, Soon Do
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Keywords
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Antarctica; paleoclimate; ice cores; major ions; water stable isotopes
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Issue Date
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2025
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Publisher
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NEW ZEALAND JOURNAL OF GEOLOGY AND GEOPHYSICS
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Citation
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Shin, Jinhwa, et al. 2025. "Seasonal variability of isotopes and chemistry in a coastal firn core from the Amundsen Sea, West Antarctica". NEW ZEALAND JOURNAL OF GEOLOGY AND GEOPHYSICS, 68(5): 1207-1218.
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Abstract
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The West Antarctic Ice Sheet (WAIS) is undergoing significant ice loss, causing global sea level rise and posing a critical threat to coastal communities worldwide (Shepherd et al. 2018; Rignot et al. 2019). We analyzed stable isotopes, major ions, and hydrogen peroxide (H2O2) in a 10.11 m shallow ice core from Moore Dome, West Antarctica, to provide a basis for future deep ice-core studies. Seasonal peaks in H2O2, methanesulfonic acid (MSA, CH3SO3-), and non-sea-salt sulphate (nss-SO42-) served as annual layer markers, yielding a chronology from austral spring/summer 2012 to 2016 and a mean accumulation rate of 1.25 m w.e. yr(-)(1). The delta D-delta O-1(8) slope of 7.93 closely matches the Global Meteoric Water Line (GMWL, slope = 8; Dansgaard 1964), indicating minimal post-depositional alteration. Comparisons with IsoGSM model output confirm that delta O-1(8) reliably reflects regional climate variability. Variations in sea-salt ions (Na+, Cl-, K+, Mg-2(+), Ca-2(+)) and biogenic sulphate (MSA, nss-SO42-) reflect seasonal marine influences, including winter sea spray and summer phytoplankton blooms. These findings highlight Moore Dome's capacity to preserve high-resolution climate signals and demonstrate the value of integrating observational records with models to improve understanding of long-term WAIS instability.
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URI
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https://repository.kopri.re.kr/handle/201206/16009
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DOI
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http://dx.doi.org/10.1080/00288306.2025.2510383
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Type
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Article
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Station
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Araon
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Indexed
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SCIE
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- 2025-2025, 국제심부빙하시추 네트워크를 활용한 대기-빙상 상호작용의 자연적·인위적 특성 규명 (25-25) / 한영철 (PE25100)
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