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Very old firn air linked to strong density layering at Styx Glacier, coastal Victoria Land, East Antarctica

Cited 3 time in wos
Cited 3 time in scopus
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Title
Very old firn air linked to strong density layering at Styx Glacier, coastal Victoria Land, East Antarctica
Other Titles
동남극 빅토리아랜드 스틱스 빙하에서 고밀도 펀층과 연관된 과거 공기
Authors
Jang, Youngjoon
Hong, Sang-Bum
Buizert, Christo
Lee, Hun-Gyu
Han, Sang-Young
Yang, Ji-Woong
Lizuka, Yoshinori
Hori, Arika
Han, Yeongcheol
Jun, Seong Joon
Tans, Pieter
Choi, Taejin
Kim, Seong-Joong
Hur, Soon Do
Ahn, Jinho
Subject
Physical Geography; Geology
Issue Date
2019-09
Citation
Jang, Youngjoon, et al. 2019. "Very old firn air linked to strong density layering at Styx Glacier, coastal Victoria Land, East Antarctica". CRYOSPHERE, 13(9): 2407-2419.
Abstract
Firn air provides plenty of old air from the near past, and can therefore be useful for understanding human impact on the recent history of the atmospheric composition. Most of the existing firn air records cover only the last several decades (typically 40 to 55 years) and are insufficient to understand the early part of anthropogenic impacts on the atmosphere. In contrast, a few firn air records from inland sites, where temperatures and snow accumulation rates are very low, go back in time about a century. In this study, we report an unusually old firn air effective CO2 age of 93 years from Styx Glacier, near the Ross Sea coast in Antarctica. This is the first report of such an old firn air age (> 55 years) from a warm coastal site. The lock-in zone thickness of 12.4m is larger than at other sites where snow accumulation rates and air temperature are similar. High-resolution X-ray density measurements demonstrate a high variability of the vertical snow density at Styx Glacier. The CH4 mole fraction and total air content of the closed pores also indicate large variations in centimeter-scale depth intervals, indicative of layering. We hypothesize that the large density variations in the firn increase the thickness of the lock-in zone and, consequently, increase the firn air ages because the age of firn air increases more rapidly with depth in the lock-in zone than in the diffusive zone. Our study demonstrates that all else being equal, sites where weather conditions are favorable for the formation of large density variations at the lock-in zone preserve older air within their open porosity, making them ideal places for firn air sampling.
URI
https://repository.kopri.re.kr/handle/201206/10960
DOI
http://dx.doi.org/10.5194/tc-13-2407-2019
Appears in Collections  
2018-2018, Reconstruction of past climate and environmental changes using high resolution ice core records in Victoria Land, Antarctica (18-18) / Hur, Soon Do (PE18040)
2017-2018, Reconstruction of past climate and environmental changes using high resolution ice core records in Victoria Land, Antarctica (17-18) / Hur, Soon Do (PE17040; PE18040)
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