Very old firn air linked to strong density layering at Styx Glacier, coastal Victoria Land, East Antarctica
Cited 0 time in
Cited 0 time in
- 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
Seong Jun Joon
Hur, Soon Do
- Issue Date
- 장영준, 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.
- 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.
- Files in This Item
- There are no files associated with this item.
- Can archive pre-print and post-print or publisher's version/PDF
Can archive post-print (ie final draft post-refereeing) or publisher's version/PDF
Can archive pre-print (ie pre-refereeing)
Archiving not formally supported
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.