DOI: 10.5194/cp-9-2013-2013
Scopus记录号: 2-s2.0-84883596154
论文题名: Simulating the temperature and precipitation signal in an Alpine ice core
作者: Brönnimann S. ; Mariani I. ; Schwikowski M. ; Auchmann R. ; Eichler A.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2013
卷: 9, 期: 4 起始页码: 2013
结束页码: 2022
语种: 英语
Scopus关键词: accumulation
; climate modeling
; ice core
; precipitation intensity
; sampling
; temperature anomaly
; Grenz Glacier
; Switzerland
; Valais
英文摘要: Accumulation and δ18O data from Alpine ice cores provide information on past temperature and precipitation. However, their correlation with seasonal or annual mean temperature and precipitation at nearby sites is often low. This is partly due to the irregular sampling of the atmosphere by the ice core (i.e. ice cores almost only record precipitation events and not dry periods) and the possible incongruity between annual layers and calendar years. Using daily meteorological data from a nearby station and reanalyses, we replicate the ice core from the Grenzgletscher (Switzerland, 4200 m a.s.l.) on a sample-by-sample basis by calculating precipitation-weighted temperature (PWT) over short intervals. Over the last 15 yr of the ice core record, accumulation and δ18O variations can be well reproduced on a sub-seasonal scale. This allows a wiggle-matching approach for defining quasi-annual layers, resulting in high correlations between measured quasi-annual δ18O and PWT. Further back in time, the agreement deteriorates. Nevertheless, we find significant correlations over the entire length of the record (1938-1993) of ice core δ18O with PWT, but not with annual mean temperature. This is due to the low correlations between PWT and annual mean temperature, a characteristic which in ERA-Interim reanalysis is also found for many other continental mid-to-high-latitude regions. The fact that meteorologically very different years can lead to similar combinations of PWT and accumulation poses limitations to the use of δ18O from Alpine ice cores for temperature reconstructions. Rather than for reconstructing annual mean temperature, δ18O from Alpine ice cores should be used to reconstruct PWT over quasi-annual periods. This variable is reproducible in reanalysis or climate model data and could thus be assimilated into conventional climate models. © Author(s) 2013. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49394
Appears in Collections: 气候变化与战略
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Recommended Citation:
Brönnimann S.,Mariani I.,Schwikowski M.,et al. Simulating the temperature and precipitation signal in an Alpine ice core[J]. Climate of the Past,2013-01-01,9(4)