DOI: 10.1002/jgrd.50217
论文题名: Production rate and climate influences on the variability of 10Be deposition simulated by ECHAM5-HAM: Globally, in Greenland, and in Antarctica
作者: Heikkilä U. ; Smith A.M.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 6 起始页码: 2506
结束页码: 2520
语种: 英语
Scopus关键词: Atmospheric pressure
; Clouds
; Deposition
; Glacial geology
; Solar energy
; Solar radiation
; Atmospheric transport
; Climatic conditions
; Ice core records
; North Atlantic oscillations
; Precipitation rates
; Production rates
; Snow accumulation
; Southern Annular Mode
; Climatology
; atmospheric deposition
; atmospheric transport
; beryllium isotope
; climate effect
; climate modeling
; climatology
; concentration (composition)
; El Nino-Southern Oscillation
; glacial environment
; Holocene
; ice core
; North Atlantic Oscillation
; seasonal variation
; snow accumulation
; solar activity
; tropopause
; Antarctica
; Arctic
; Greenland
英文摘要: [1] Ice core concentrations of 10Be are used as a proxy for solar activity, but they might be affected by atmospheric transport and deposition and their changes. During the Holocene, the influence is likely to be small, but during glacials it has to be accounted for. First, the climate influence has to be understood during the present climate. This study uses an ECHAM5-HAM 30-year climatological simulation of 10Be to investigate the production and climate-related influences on 10Be deposition with focus on Greenland and Antarctica. We examine the climate modes driving snow accumulation and hence potentially 10Be deposition over a climatologically relevant period. The North Atlantic Oscillation (NAO) is found to be the main driver of changes in precipitation and 10Be deposition in Greenland, in agreement with previous studies. In Antarctica, the picture is more complex as precipitation and 10Be deposition are only weakly correlated with the Southern Annular Mode (SAM), El Niño-Southern Oscillation (ENSO), or Zonal Wave 3 pattern (ZW3). The results suggest that on seasonal scale, 10Be deposition is linked with both precipitation rate and tropopause height, mainly due to the similar seasonal cycle. However, the correlation with tropopause height persists on the annual time scale. All in all, 10Be variability in Antarctica is an interplay of several processes whose contribution varies in time and space. When interpreting 10Be ice core records for solar activity, the time scale is essentially important. On seasonal scale, the 10Be signal is dominated by weather influences, but on multiannual scales, the production rate is the main driver. On multidecadal scale, large long-term trends in climatic factors have the potential to distort the signal again as is seen in 10Be records during glacials. This study shows how climate modes connect to 10Be variability and how this connection could be used to correct for the climate impact. The established connections during present climatic conditions can be used as a basis to investigate these connections during glacial climate in a glacial model simulation. © 2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63863
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Australian Nuclear Science and Technology Organisation (ANSTO), Locked bag 2001, Kirrawee DC, 2232 NSW, Australia
Recommended Citation:
Heikkilä U.,Smith A.M.. Production rate and climate influences on the variability of 10Be deposition simulated by ECHAM5-HAM: Globally, in Greenland, and in Antarctica[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(6)