Scopus记录号: 2-s2.0-85061960539
论文题名: Seasonal Antarctic pressure variability during the twentieth century from spatially complete reconstructions and CAM5 simulations
作者: Fogt R.L. ; Schneider D.P. ; Goergens C.A. ; Jones J.M. ; Clark L.N. ; Garberoglio M.J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2019
语种: 英语
英文摘要: As most permanent observations in Antarctica started in the 1950s, understanding Antarctic climate variations throughout the twentieth century remains a challenge. To address this issue, the non-summer multi-decadal variability in pressure reconstructions poleward of 60°S is evaluated and assessed in conjunction with climate model simulations throughout the twentieth and early twenty-first centuries to understand historical atmospheric circulation variability over Antarctica. Austral autumn and winter seasons show broadly similar patterns, with negative anomalies in the early twentieth century (1905–1934), positive pressure anomalies in the middle twentieth century (1950–1980), and negative pressure anomalies in the most recent period (1984–2013), consistent with concurrent trends in the SAM index. In autumn, the anomalies are significant in the context of estimates of interannual variability and reconstruction uncertainty across most of the Antarctic continent, and the reconstructed patterns agree best with model-generated patterns when the simulation includes the forced response to tropical sea surface temperatures and external radiative forcing. In winter and spring, the reconstructed anomalies are less significant and are consistent with internal atmospheric variability alone. The specific role of tropical SST variability on pressure trends in these seasons is difficult to assess due to low reconstruction skill in the region of strongest tropical teleconnections, the large internal atmospheric variability, and uncertainty in the SST patterns themselves. Indirect estimates of pressure variability, whether through sea ice reconstructions, proxy records, or improved models and data assimilation schemes, will help to further constrain the magnitude of internal variability relative to the forced responses expected from SST trends and external radiative forcing. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature. 资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122526
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Geography and Scalia Laboratory for Atmospheric Analysis, Ohio University, 122 Clippinger Laboratories, Athens, OH 45701, United States; National Center for Atmospheric Research, Boulder, CO, United States; Department of Geography, University of Sheffield, Sheffield, United Kingdom
Recommended Citation:
Fogt R.L.,Schneider D.P.,Goergens C.A.,et al. Seasonal Antarctic pressure variability during the twentieth century from spatially complete reconstructions and CAM5 simulations[J]. Climate Dynamics,2019-01-01