DOI: 10.5194/tc-10-879-2016
Scopus记录号: 2-s2.0-84966283929
论文题名: Analyzing airflow in static ice caves by using the calcFLOW method
作者: Meyer C ; , Meyer U ; , Pflitsch A ; , Maggi V
刊名: Cryosphere
ISSN: 19940416
出版年: 2016
卷: 10, 期: 2 起始页码: 879
结束页码: 894
语种: 英语
英文关键词: air temperature
; airflow
; cave
; ice cover
; mixing
; temperature profile
; time series analysis
; travel time
; wind velocity
英文摘要: In this paper we present a method to detect airflow through ice caves and to quantify the corresponding airflow speeds by the use of temperature loggers. The time series of temperature observations at different loggers are cross-correlated. The time shift of best correlation corresponds to the travel time of the air and is used to derive the airflow speed between the loggers. We apply the method to test data observed inside Schellenberger Eishöhle (ice cave). The successful determination of airflow speeds depends on the existence of distinct temperature variations during the time span of interest. Moreover the airflow speed is assumed to be constant during the period used for the correlation analysis. Both requirements limit the applicability of the correlation analysis to determine instantaneous airflow speeds. Nevertheless the method is very helpful to characterize the general patterns of air movement and their slow temporal variations. The correlation analysis assumes a linear dependency between the correlated data. The good correlation we found for our test data confirms this assumption. We therefore in a second step estimate temperature biases and scale factors for the observed temperature variations by a least-squares adjustment. The observed phenomena, a warming and an attenuation of temperature variations, depending on the distance the air traveled inside the cave, are explained by a mixing of the inflowing air with the air inside the cave. Furthermore we test the significance of the determined parameters by a standard F test and study the sensitivity of the procedure to common manipulations of the original observations like smoothing. In the end we will give an outlook on possible applications and further development of this method. © Author(s) 2016. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75152
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: Universita di Milano-Bicocca, Dipartimento di Scienze Ambiente e Territorio e Scienze della Terra, Piazza della Scienza 1, Milan, Italy; University of Bern, Astronomical Institute, Sidlerstrasse 5, Bern, Switzerland; Ruhr-University Bochum, Geography Department, Working Group Cave- and Subway-Climatology, Universitätsstrasse 150, Bochum, Germany
Recommended Citation:
Meyer C,, Meyer U,, Pflitsch A,et al. Analyzing airflow in static ice caves by using the calcFLOW method[J]. Cryosphere,2016-01-01,10(2)