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Chronostratigraphy of the Larsen blue-ice area in northern Victoria Land, East Antarctica, and its implications for paleoclimate

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Title
Chronostratigraphy of the Larsen blue-ice area in northern Victoria Land, East Antarctica, and its implications for paleoclimate
Other Titles
동남극 북부 빅토리아랜드 Larsen 청빙지역의 연대층과 고기후의 영향
Authors
Lee, Giyoon
Ahn, Jinho
Ju, Hyeontae
Ritterbusch, Florian
Oyabu, Ikumi
Buizert, Christo
Kim, Songyi
Moon, Jangil
Ghosh, Sambit
Kawamura, Kenji
Lu, Zheng-Tian
Hong, Sangbum
Han, Chang Hee
Hur, Soon Do
Jiang, Wei
Yang, Guo-Min
Subject
Physical GeographyGeology
Keywords
ABRUPT CLIMATE-CHANGECORE WD2014 CHRONOLOGYBIPOLAR SEE-SAWPOLAR ICETAYLOR GLACIERFRONTIER MOUNTAINATMOSPHERIC CO2DOME-CISOTOPIC COMPOSITIONLATE PLEISTOCENE
Issue Date
2022-06-15
Citation
Lee, Giyoon, et al. 2022. "Chronostratigraphy of the Larsen blue-ice area in northern Victoria Land, East Antarctica, and its implications for paleoclimate". CRYOSPHERE, 16(6): 2301-2324.
Abstract
In blue-ice areas (BIAs), deep ice is directly exposed at the surface, allowing for the cost-effective collection of large-sized old-ice samples. However, chronostratigraphic studies on blue-ice areas are challenging owing to fold and fault structures. Here, we report on a surface transect of ice with an undisturbed horizontal stratigraphy from the Larsen BIA, northern Victoria Land, East Antarctica. Ice layers defined by dust bands and ground-penetrating radar (GPR) surveys indicate a monotonic increase in age along the ice flow direction on the downstream side, while the upstream ice exhibits a potential repetition of ages on scales of tens of meters, which result from a complicated fold structure. Stable water isotopes (δ18Oice and δ2Hice) and components of the occluded air (i.e., CO2, N2O, CH4, δ15N-N2, δ18Oatm (= δ18O-O2), δO2/N2, δAr/N2, 81Kr and 85Kr) are analyzed for surface ice and shallow ice core samples. Correlating δ18Oice, δ18Oatm, and CH4 records from the Larsen BIA with ice from previously drilled ice cores indicates that the gas age at various shallow vertical coring sites ranges between 9.2-23.4 kyr BP, while the ice age sampled from the surface ranges from 5.6 to 24.7 kyr BP. Absolute radiometric 81Kr dating for the two vertical cores confirms ages within acceptable levels of analytical uncertainty. A tentative climate reconstruction suggests a large deglacial warming of 15±5℃ (1σ) and an increase in snow accumulation by a factor of 1.7-4.6 (from 24.3 to 10.6 kyr BP). Our study demonstrates that BIAs in northern Victoria Land may help to obtain high quality records for paleoclimate and atmospheric greenhouse gas compositions through the last deglaciation, although in general climatic interpretation is complicated by the need for upstream flow corrections, evidence for strong surface sublimation during the last glacial period, and potential errors in the estimated gas age-ice age difference.
URI
https://repository.kopri.re.kr/handle/201206/13905
DOI
http://dx.doi.org/10.5194/tc-16-2301-2022
Type
Article
Station
Jang Bogo Station
Indexed
SCIE
Appears in Collections  
2021-2021, Investigating anthropogenic and natural characteristics of atmosphere-ice sheet exchanges using the international deep ice coring network (21-21) / Kang, Jung-Ho (PE21100)
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