Raman spectroscopic and statistical studies on natural clathrates from the Greenland Ice Core Project ice core, and neutron diffraction studies on synthetic nitrogen clathrates
We present the results of Raman spectroscopic experiments on air clathrates in the GReenland Ice Core Project (GRIP) deep ice core, which differ markedly from previous measurements on the Dye 3 ice core. The N-2/O-2 ratio we observe is much closer to the atmospheric value. This has new implications...
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ftawi:oai:epic.awi.de:2360 2023-09-05T13:19:08+02:00 Raman spectroscopic and statistical studies on natural clathrates from the Greenland Ice Core Project ice core, and neutron diffraction studies on synthetic nitrogen clathrates Pauer, F. Kipfstuhl, J. Kuhs, W. F. 1997 https://epic.awi.de/id/eprint/2360/ https://hdl.handle.net/10013/epic.12948 unknown Pauer, F. , Kipfstuhl, J. and Kuhs, W. F. (1997) Raman spectroscopic and statistical studies on natural clathrates from the Greenland Ice Core Project ice core, and neutron diffraction studies on synthetic nitrogen clathrates , Journal of Geophysical Research-Oceans, Vol. 102, No C12, pp. 26519-26526 . hdl:10013/epic.12948 EPIC3Journal of Geophysical Research-Oceans, Vol. 102, No C12, pp. 26519-26526 Article isiRev 1997 ftawi 2023-08-22T19:43:17Z We present the results of Raman spectroscopic experiments on air clathrates in the GReenland Ice Core Project (GRIP) deep ice core, which differ markedly from previous measurements on the Dye 3 ice core. The N-2/O-2 ratio we observe is much closer to the atmospheric value. This has new implications for the interpretation of gas distributions in ice sheets. Raman spectroscopic scans to determine the N-2/O-2 ratios on different planes through a clathrate, in which the two axes of the scans are perpendicular to each other, give no indication of fractionation effects on the N-2/O-2 concentrations within a clathrate specimen. The frequency shift of the N-2 and O-2 peaks due to decomposition of a clathrate to an air bubble is shown qualitatively. From their peak integrals there is no indication of different retransformation rates to air bubbles between the oxygen and the nitrogen contents of clathrates. In air bubbles resulting from clathrate decomposition, the N-2/O-2 ratio shows similar values to those observed in clathrates and present atmospheric values. Statistical studies on the size, shape, and number concentration of clathrates are intended to give an estimate of the total amount of gas occluded in the clathrates. We present preliminary results obtained from 27 samples in a depth range between 1100 and 3000 m. The first neutron powder diffraction experiments reveal an overall degree of filling of 96.4% for a clathrate at a pressure of 449 bars and the existence of a type I phase at 1311 bars with an overall degree of filling of 107.5%. Article in Journal/Newspaper Dye 3 Dye-3 Greenland Greenland ice core Greenland Ice core Project GRIP ice core Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Greenland |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
We present the results of Raman spectroscopic experiments on air clathrates in the GReenland Ice Core Project (GRIP) deep ice core, which differ markedly from previous measurements on the Dye 3 ice core. The N-2/O-2 ratio we observe is much closer to the atmospheric value. This has new implications for the interpretation of gas distributions in ice sheets. Raman spectroscopic scans to determine the N-2/O-2 ratios on different planes through a clathrate, in which the two axes of the scans are perpendicular to each other, give no indication of fractionation effects on the N-2/O-2 concentrations within a clathrate specimen. The frequency shift of the N-2 and O-2 peaks due to decomposition of a clathrate to an air bubble is shown qualitatively. From their peak integrals there is no indication of different retransformation rates to air bubbles between the oxygen and the nitrogen contents of clathrates. In air bubbles resulting from clathrate decomposition, the N-2/O-2 ratio shows similar values to those observed in clathrates and present atmospheric values. Statistical studies on the size, shape, and number concentration of clathrates are intended to give an estimate of the total amount of gas occluded in the clathrates. We present preliminary results obtained from 27 samples in a depth range between 1100 and 3000 m. The first neutron powder diffraction experiments reveal an overall degree of filling of 96.4% for a clathrate at a pressure of 449 bars and the existence of a type I phase at 1311 bars with an overall degree of filling of 107.5%. |
format |
Article in Journal/Newspaper |
author |
Pauer, F. Kipfstuhl, J. Kuhs, W. F. |
spellingShingle |
Pauer, F. Kipfstuhl, J. Kuhs, W. F. Raman spectroscopic and statistical studies on natural clathrates from the Greenland Ice Core Project ice core, and neutron diffraction studies on synthetic nitrogen clathrates |
author_facet |
Pauer, F. Kipfstuhl, J. Kuhs, W. F. |
author_sort |
Pauer, F. |
title |
Raman spectroscopic and statistical studies on natural clathrates from the Greenland Ice Core Project ice core, and neutron diffraction studies on synthetic nitrogen clathrates |
title_short |
Raman spectroscopic and statistical studies on natural clathrates from the Greenland Ice Core Project ice core, and neutron diffraction studies on synthetic nitrogen clathrates |
title_full |
Raman spectroscopic and statistical studies on natural clathrates from the Greenland Ice Core Project ice core, and neutron diffraction studies on synthetic nitrogen clathrates |
title_fullStr |
Raman spectroscopic and statistical studies on natural clathrates from the Greenland Ice Core Project ice core, and neutron diffraction studies on synthetic nitrogen clathrates |
title_full_unstemmed |
Raman spectroscopic and statistical studies on natural clathrates from the Greenland Ice Core Project ice core, and neutron diffraction studies on synthetic nitrogen clathrates |
title_sort |
raman spectroscopic and statistical studies on natural clathrates from the greenland ice core project ice core, and neutron diffraction studies on synthetic nitrogen clathrates |
publishDate |
1997 |
url |
https://epic.awi.de/id/eprint/2360/ https://hdl.handle.net/10013/epic.12948 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Dye 3 Dye-3 Greenland Greenland ice core Greenland Ice core Project GRIP ice core |
genre_facet |
Dye 3 Dye-3 Greenland Greenland ice core Greenland Ice core Project GRIP ice core |
op_source |
EPIC3Journal of Geophysical Research-Oceans, Vol. 102, No C12, pp. 26519-26526 |
op_relation |
Pauer, F. , Kipfstuhl, J. and Kuhs, W. F. (1997) Raman spectroscopic and statistical studies on natural clathrates from the Greenland Ice Core Project ice core, and neutron diffraction studies on synthetic nitrogen clathrates , Journal of Geophysical Research-Oceans, Vol. 102, No C12, pp. 26519-26526 . hdl:10013/epic.12948 |
_version_ |
1776199951919874048 |