DOI: 10.5194/tc-7-303-2013
Scopus记录号: 2-s2.0-84874459227
论文题名: A synthesis of the Antarctic surface mass balance during the last 800 yr
作者: Frezzotti M ; , Scarchilli C ; , Becagli S ; , Proposito M ; , Urbini S
刊名: Cryosphere
ISSN: 19940416
出版年: 2013
卷: 7, 期: 1 起始页码: 303
结束页码: 319
语种: 英语
英文关键词: accumulation
; anticyclone
; atmospheric circulation
; atmospheric wave
; climate modeling
; cryosphere
; global climate
; ice core
; ice sheet
; irradiance
; mass balance
; paleoatmosphere
; reconstruction
; snow cover
; teleconnection
; warming
; wave propagation
; Antarctica
; Pacific Ocean
; Pacific Ocean (Tropical)
英文摘要: Global climate models suggest that Antarctic snowfall should increase in a warming climate and mitigate rises in the sea level. Several processes affect surface mass balance (SMB), introducing large uncertainties in past, present and future ice sheet mass balance. To provide an extended perspective on the past SMB of Antarctica, we used 67 firn/ice core records to reconstruct the temporal variability in the SMB over the past 800 yr and, in greater detail, over the last 200 yr. Our SMB reconstructions indicate that the SMB changes over most of Antarctica are statistically negligible and that the current SMB is not exceptionally high compared to the last 800 yr. High-accumulation periods have occurred in the past, specifically during the 1370s and 1610s. However, a clear increase in accumulation of more than 10% has occurred in high SMB coastal regions and over the highest part of the East Antarctic ice divide since the 1960s. To explain the differences in behaviour between the coastal/ice divide sites and the rest of Antarctica, we suggest that a higher frequency of blocking anticyclones increases the precipitation at coastal sites, leading to the advection of moist air in the highest areas, whereas blowing snow and/or erosion have significant negative impacts on the SMB at windy sites. Eight hundred years of stacked records of the SMB mimic the total solar irradiance during the 13th and 18th centuries. The link between those two variables is probably indirect and linked to a teleconnection in atmospheric circulation that forces complex feedback between the tropical Pacific and Antarctica via the generation and propagation of a large-scale atmospheric wave train. © 2013 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74994
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: ENEA, Agenzia Nazionale per le Nuove Tecnologie, l'Energia e Lo Sviluppo Sostenibile, Rome, Italy; Department of Chemistry, University of Florence, Sesto F.no, Italy; INGV, Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy
Recommended Citation:
Frezzotti M,, Scarchilli C,, Becagli S,et al. A synthesis of the Antarctic surface mass balance during the last 800 yr[J]. Cryosphere,2013-01-01,7(1)