Analyzing airflow in static ice caves by using the calcFLOW method

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 trave...

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Published in:The Cryosphere
Main Authors: Meyer, Christiane, Meyer, Ulrich, Pflitsch, Andreas, Maggi, Valter
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2016
Subjects:
Online Access:https://doi.org/10.5194/tc-10-879-2016
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spelling ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00013540 2023-05-15T18:32:32+02:00 Analyzing airflow in static ice caves by using the calcFLOW method Meyer, Christiane Meyer, Ulrich Pflitsch, Andreas Maggi, Valter 2016-04 electronic https://doi.org/10.5194/tc-10-879-2016 https://noa.gwlb.de/receive/cop_mods_00013540 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00013496/tc-10-879-2016.pdf https://tc.copernicus.org/articles/10/879/2016/tc-10-879-2016.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-10-879-2016 https://noa.gwlb.de/receive/cop_mods_00013540 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00013496/tc-10-879-2016.pdf https://tc.copernicus.org/articles/10/879/2016/tc-10-879-2016.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2016 ftnonlinearchiv https://doi.org/10.5194/tc-10-879-2016 2022-02-08T22:55:33Z 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. Article in Journal/Newspaper The Cryosphere Niedersächsisches Online-Archiv NOA The Cryosphere 10 2 879 894
institution Open Polar
collection Niedersächsisches Online-Archiv NOA
op_collection_id ftnonlinearchiv
language English
topic article
Verlagsveröffentlichung
spellingShingle article
Verlagsveröffentlichung
Meyer, Christiane
Meyer, Ulrich
Pflitsch, Andreas
Maggi, Valter
Analyzing airflow in static ice caves by using the calcFLOW method
topic_facet article
Verlagsveröffentlichung
description 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.
format Article in Journal/Newspaper
author Meyer, Christiane
Meyer, Ulrich
Pflitsch, Andreas
Maggi, Valter
author_facet Meyer, Christiane
Meyer, Ulrich
Pflitsch, Andreas
Maggi, Valter
author_sort Meyer, Christiane
title Analyzing airflow in static ice caves by using the calcFLOW method
title_short Analyzing airflow in static ice caves by using the calcFLOW method
title_full Analyzing airflow in static ice caves by using the calcFLOW method
title_fullStr Analyzing airflow in static ice caves by using the calcFLOW method
title_full_unstemmed Analyzing airflow in static ice caves by using the calcFLOW method
title_sort analyzing airflow in static ice caves by using the calcflow method
publisher Copernicus Publications
publishDate 2016
url https://doi.org/10.5194/tc-10-879-2016
https://noa.gwlb.de/receive/cop_mods_00013540
https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00013496/tc-10-879-2016.pdf
https://tc.copernicus.org/articles/10/879/2016/tc-10-879-2016.pdf
genre The Cryosphere
genre_facet The Cryosphere
op_relation The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424
https://doi.org/10.5194/tc-10-879-2016
https://noa.gwlb.de/receive/cop_mods_00013540
https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00013496/tc-10-879-2016.pdf
https://tc.copernicus.org/articles/10/879/2016/tc-10-879-2016.pdf
op_rights uneingeschränkt
info:eu-repo/semantics/openAccess
op_doi https://doi.org/10.5194/tc-10-879-2016
container_title The Cryosphere
container_volume 10
container_issue 2
container_start_page 879
op_container_end_page 894
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