CHARACTERISTICS OF AC-ECM SIGNALS OBTAINED BY USE OF THE VESTFONNA ICE CORE, SVALBARD
AC-ECM measurements of the Vestfonna ice core were carried out under the following conditions : at -12,-17,-22 and -27℃ under 1MHz; at -22℃ under frequencies from 300kHz to 1MHz. The relationship between conductance measured with AC-ECM and acidity was linear. It is considered that salt impurities a...
Main Authors: | , , , , , , , , , , , |
---|---|
Format: | Report |
Language: | English |
Published: |
Institute of Low Temperature Science, Hokkaido University
1997
|
Subjects: | |
Online Access: | https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3970 http://id.nii.ac.jp/1291/00003970/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3970&item_no=1&attribute_id=18&file_no=1 |
id |
ftnipr:oai:nipr.repo.nii.ac.jp:00003970 |
---|---|
record_format |
openpolar |
spelling |
ftnipr:oai:nipr.repo.nii.ac.jp:00003970 2023-05-15T16:38:17+02:00 CHARACTERISTICS OF AC-ECM SIGNALS OBTAINED BY USE OF THE VESTFONNA ICE CORE, SVALBARD マツオカ ケンイチ ナリタ ヒデキ スギヤマ ケン マトバ スミト モトヤマ ヒデアキ ワタナベ オキツグ Kenichi MATSUOKA Hideki NARITA Ken SUGIYAMA Sumito MATOBA Hideaki MOTOYAMA Okitsugu WATANABE 1997-11 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3970 http://id.nii.ac.jp/1291/00003970/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3970&item_no=1&attribute_id=18&file_no=1 en eng Institute of Low Temperature Science, Hokkaido University Department of Applied Physics, Faculty of Engineering, Hokkaido University National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3970 http://id.nii.ac.jp/1291/00003970/ AA10756213 Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology, 11, 67-75(1997-11) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3970&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1997 ftnipr 2022-12-31T19:49:35Z AC-ECM measurements of the Vestfonna ice core were carried out under the following conditions : at -12,-17,-22 and -27℃ under 1MHz; at -22℃ under frequencies from 300kHz to 1MHz. The relationship between conductance measured with AC-ECM and acidity was linear. It is considered that salt impurities also affect to the AC-ECM signals. However, we focus on the effect of acidity, because it is known that the effect of acid on the a. c. conductance is 3.6 times as large as that of salt from DEP analysis of the Dolleman ice core. The intercept of the linear regression is coincident with the conductance of pure ice; at -23℃, it is 3.6nS. The gradient, conductance increases raised acid, is 0.70nS l/μmol at -23℃. The gradients at four temperatures were well fitted with the Arrhenius equation and activation energy is 24.8kJ/mol. Activation energy obtained from this study, the Dolleman ice core and acid-doped ice agree with each other within the error range. The conductance at -22℃ increases monotonically from 300kHz to 1MHz. This tendency is not caused by the system but by impurities in the specimen. The ratio between the conductance at 300kHz and at 1MHz is 0.845. This can not explain with one Debye dispersion. These results add basic knowledge for radio-echo soundings, especially at percolation zone in the ice cap. Report Ice cap ice core Polar meteorology and glaciology Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology Svalbard Vestfonna National Institute of Polar Research Repository, Japan Svalbard Vestfonna ENVELOPE(20.761,20.761,79.941,79.941) Dolleman ENVELOPE(-60.733,-60.733,-70.616,-70.616) |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
AC-ECM measurements of the Vestfonna ice core were carried out under the following conditions : at -12,-17,-22 and -27℃ under 1MHz; at -22℃ under frequencies from 300kHz to 1MHz. The relationship between conductance measured with AC-ECM and acidity was linear. It is considered that salt impurities also affect to the AC-ECM signals. However, we focus on the effect of acidity, because it is known that the effect of acid on the a. c. conductance is 3.6 times as large as that of salt from DEP analysis of the Dolleman ice core. The intercept of the linear regression is coincident with the conductance of pure ice; at -23℃, it is 3.6nS. The gradient, conductance increases raised acid, is 0.70nS l/μmol at -23℃. The gradients at four temperatures were well fitted with the Arrhenius equation and activation energy is 24.8kJ/mol. Activation energy obtained from this study, the Dolleman ice core and acid-doped ice agree with each other within the error range. The conductance at -22℃ increases monotonically from 300kHz to 1MHz. This tendency is not caused by the system but by impurities in the specimen. The ratio between the conductance at 300kHz and at 1MHz is 0.845. This can not explain with one Debye dispersion. These results add basic knowledge for radio-echo soundings, especially at percolation zone in the ice cap. |
format |
Report |
author |
マツオカ ケンイチ ナリタ ヒデキ スギヤマ ケン マトバ スミト モトヤマ ヒデアキ ワタナベ オキツグ Kenichi MATSUOKA Hideki NARITA Ken SUGIYAMA Sumito MATOBA Hideaki MOTOYAMA Okitsugu WATANABE |
spellingShingle |
マツオカ ケンイチ ナリタ ヒデキ スギヤマ ケン マトバ スミト モトヤマ ヒデアキ ワタナベ オキツグ Kenichi MATSUOKA Hideki NARITA Ken SUGIYAMA Sumito MATOBA Hideaki MOTOYAMA Okitsugu WATANABE CHARACTERISTICS OF AC-ECM SIGNALS OBTAINED BY USE OF THE VESTFONNA ICE CORE, SVALBARD |
author_facet |
マツオカ ケンイチ ナリタ ヒデキ スギヤマ ケン マトバ スミト モトヤマ ヒデアキ ワタナベ オキツグ Kenichi MATSUOKA Hideki NARITA Ken SUGIYAMA Sumito MATOBA Hideaki MOTOYAMA Okitsugu WATANABE |
author_sort |
マツオカ ケンイチ |
title |
CHARACTERISTICS OF AC-ECM SIGNALS OBTAINED BY USE OF THE VESTFONNA ICE CORE, SVALBARD |
title_short |
CHARACTERISTICS OF AC-ECM SIGNALS OBTAINED BY USE OF THE VESTFONNA ICE CORE, SVALBARD |
title_full |
CHARACTERISTICS OF AC-ECM SIGNALS OBTAINED BY USE OF THE VESTFONNA ICE CORE, SVALBARD |
title_fullStr |
CHARACTERISTICS OF AC-ECM SIGNALS OBTAINED BY USE OF THE VESTFONNA ICE CORE, SVALBARD |
title_full_unstemmed |
CHARACTERISTICS OF AC-ECM SIGNALS OBTAINED BY USE OF THE VESTFONNA ICE CORE, SVALBARD |
title_sort |
characteristics of ac-ecm signals obtained by use of the vestfonna ice core, svalbard |
publisher |
Institute of Low Temperature Science, Hokkaido University |
publishDate |
1997 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3970 http://id.nii.ac.jp/1291/00003970/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3970&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(20.761,20.761,79.941,79.941) ENVELOPE(-60.733,-60.733,-70.616,-70.616) |
geographic |
Svalbard Vestfonna Dolleman |
geographic_facet |
Svalbard Vestfonna Dolleman |
genre |
Ice cap ice core Polar meteorology and glaciology Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology Svalbard Vestfonna |
genre_facet |
Ice cap ice core Polar meteorology and glaciology Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology Svalbard Vestfonna |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3970 http://id.nii.ac.jp/1291/00003970/ AA10756213 Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology, 11, 67-75(1997-11) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3970&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766028569406865408 |