DOI: 10.5194/tc-12-1069-2018
Scopus记录号: 2-s2.0-85044422420
论文题名: New insights into the use of stable water isotopes at the northern Antarctic Peninsula as a tool for regional climate studies
作者: Fernandoy F ; , Tetzner D ; , Meyer H ; , Gacitúa G ; , Hoffmann K ; , Falk U ; , Lambert F ; , MacDonell S
刊名: Cryosphere
ISSN: 19940416
出版年: 2018
卷: 12, 期: 3 起始页码: 1069
结束页码: 1090
语种: 英语
英文摘要: Due to recent atmospheric and oceanic warming, the Antarctic Peninsula is one of the most challenging regions of Antarctica to understand in terms of both local-and regional-scale climate signals. Steep topography and a lack of long-term and in situ meteorological observations complicate the extrapolation of existing climate models to the sub-regional scale. Therefore, new techniques must be developed to better understand processes operating in the region. Isotope signals are traditionally related mainly to atmospheric conditions, but a detailed analysis of individual components can give new insight into oceanic and atmospheric processes. This paper aims to use new isotopic records collected from snow and firn cores in conjunction with existing meteorological and oceanic datasets to determine changes at the climatic scale in the northern extent of the Antarctic Peninsula. In particular, a discernible effect of sea ice cover on local temperatures and the expression of climatic modes, especially the Southern Annular Mode (SAM), is demonstrated. In years with a large sea ice extension in winter (negative SAM anomaly), an inversion layer in the lower troposphere develops at the coastal zone. Therefore, an isotope-temperature relationship (δ-T) valid for all periods cannot be obtained, and instead the δ-T depends on the seasonal variability of oceanic conditions. Comparatively, transitional seasons (autumn and spring) have a consistent isotope-temperature gradient of +0.69 °C-1. As shown by firn core analysis, the near-surface temperature in the northern-most portion of the Antarctic Peninsula shows a decreasing trend (-0.33°Cyear-1) between 2008 and 2014. In addition, the deuterium excess (dexcess) is demonstrated to be a reliable indicator of seasonal oceanic conditions, and therefore suitable to improve a firn age model based on seasonal dexcess variability. The annual accumulation rate in this region is highly variable, ranging between 1060 and 2470kgm-2year-1 from 2008 to 2014. The combination of isotopic and meteorological data in areas where data exist is key to reconstruct climatic conditions with a high temporal resolution in polar regions where no direct observations exist. © 2018 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75392
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Facultad de Ingenieria, Universidad Andres Bello, Viña del Mar, Chile; Center for Climate and Resilience Research, Universidad de Chile, Santiago, Chile; Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Research Unit Potsdam, Telegrafenberg A43, Potsdam, Germany; Programa GAIA-Antártica, Universidad de Magallanes, Punta Arenas, Chile; Climate Lab, Geography Department, University Bremen, Bremen, Germany; Department of Physical Geography, Pontificia Universidad Católica de Chile, Santiago, Chile; Centro de Estudios Avanzados en Zonas Áridas (CEAZA), La Serena, Chile
Recommended Citation:
Fernandoy F,, Tetzner D,, Meyer H,et al. New insights into the use of stable water isotopes at the northern Antarctic Peninsula as a tool for regional climate studies[J]. Cryosphere,2018-01-01,12(3)