DOI: 10.1007/s00382-016-3347-5
Scopus记录号: 2-s2.0-84988733930
论文题名: Temperature reconstruction from the length fluctuations of small glaciers in the eastern Alps (northeastern Italy)
作者: Zecchetto S. ; Serandrei-Barbero R. ; Donnici S.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 49, 期: 2017-01-02 起始页码: 363
结束页码: 374
语种: 英语
英文关键词: Air temperatures
; Climate sensitivity
; Eastern Alps
; Glacier fluctuations
英文摘要: In this study, a linear model computing the air temperature fluctuations from the measured glacier snout fluctuations has been applied, for the first time, to three small glaciers in the western Tauern Alps (eastern Alps) in the period 1929–2011. The considered glaciers, with areas between 0.2 and 1.3km2, are characterized by relevant time variations of their morphology, length and slope. The model requires the knowledge of two parameters: the glacier climate sensitivity Cs and the glacier response time τ, both depending on the glacier morphological characteristics and on the precipitation. Applied to the glaciers assuming Cs and τ as in the original formulation, it underestimates the temperature increase of ≈1.8∘C derived over the whole period from the in situ data. Given the characteristics of these small glaciers, these parameters have been recalibrated by means of a non-linear least-square regression using an independent set of glaciers. Their mean value is of about 210 m/K and 3.8 years respectively. With the recalibrated values of the new glacier climate sensitivity Cs∗ and response time τ∗, the temperature fluctuations derived by the model reproduce well those obtained from the observed temperatures computed over the hydrological year, with linear correlations between 0.8 and 0.9. The increase of the modeled mean temperature over the whole period fits in with that derived from observed temperature. Considering that the length fluctuations of these small glaciers affect significantly their slope and length, we tested the impact in the model of a time dependent formulation of Cs and τ: the results indicate slight improvements both in the values of the correlation between the reconstructed and the observed temperature fluctuations and in the global temperature increase. Given the above value of climate sensitivity, the large retreat of the small alpine glaciers threatens their survival within a few decades, but the morphological changes in progress may counteract the glacier disappearance. © 2016, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53147
Appears in Collections: 过去全球变化的重建
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作者单位: ISAC-Istituto di Scienze dell’ Atmosfera e del Clima, Consiglio Nazionale delle Ricerche, Padova, Italy; ISMAR-Istituto di Scienze Marine, Consiglio Nazionale delle Ricerche, Venice, Italy; Comitato Glaciologico Italiano, Torino, Italy
Recommended Citation:
Zecchetto S.,Serandrei-Barbero R.,Donnici S.. Temperature reconstruction from the length fluctuations of small glaciers in the eastern Alps (northeastern Italy)[J]. Climate Dynamics,2017-01-01,49(2017-01-02)