Direct measurement of optical properties of glacier ice using a photon-counting diffuse LiDAR
The production of meltwater from glacier ice, which is exposed at the margins of land ice during the summer, is responsible for a large proportion of glacier mass loss. The rate of meltwater production from glacier ice is especially sensitive to its physical structure and chemical composition which...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Cambridge University Press
2022-12-01
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| Series: | Journal of Glaciology |
| Subjects: | |
| Online Access: | https://www.cambridge.org/core/product/identifier/S002214302200034X/type/journal_article |
| _version_ | 1811155727901786112 |
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| author | Markus Allgaier Matthew G. Cooper Anders E. Carlson Sarah W. Cooley Jonathan C. Ryan Brian J. Smith |
| author_facet | Markus Allgaier Matthew G. Cooper Anders E. Carlson Sarah W. Cooley Jonathan C. Ryan Brian J. Smith |
| author_sort | Markus Allgaier |
| collection | DOAJ |
| description | The production of meltwater from glacier ice, which is exposed at the margins of land ice during the summer, is responsible for a large proportion of glacier mass loss. The rate of meltwater production from glacier ice is especially sensitive to its physical structure and chemical composition which combine to determine the albedo of glacier ice. However, the optical properties of near-surface glacier ice are not well known since most prior work has focused on laboratory-grown ice or deep cores. Here, we demonstrate a measurement technique based on diffuse propagation of nanosecond-duration laser pulses in near-surface glacier ice that enables the independent measurement of the scattering and absorption coefficients, allowing for a complete description of the processes governing radiative transfer. We employ a photon-counting detector to overcome the high losses associated with diffuse optics. The instrument is highly portable and rugged, making it optimally suited for deployment in remote regions. A set of measurements taken on Crook and Collier Glaciers, Oregon, serves as a demonstration of the technique. These measurements provide insight into both physical structure and composition of near-surface glacier ice and open new avenues for the analysis of light-absorbing impurities and remote sensing of the cryosphere. |
| first_indexed | 2024-04-10T04:39:25Z |
| format | Article |
| id | doaj.art-3e9b7c6d2fb84b768b365b1252d24010 |
| institution | Directory Open Access Journal |
| issn | 0022-1430 1727-5652 |
| language | English |
| last_indexed | 2024-04-10T04:39:25Z |
| publishDate | 2022-12-01 |
| publisher | Cambridge University Press |
| record_format | Article |
| series | Journal of Glaciology |
| spelling | doaj.art-3e9b7c6d2fb84b768b365b1252d240102023-03-09T12:41:19ZengCambridge University PressJournal of Glaciology0022-14301727-56522022-12-01681210122010.1017/jog.2022.34Direct measurement of optical properties of glacier ice using a photon-counting diffuse LiDARMarkus Allgaier0https://orcid.org/0000-0002-2179-6250Matthew G. Cooper1https://orcid.org/0000-0002-0165-209XAnders E. Carlson2Sarah W. Cooley3Jonathan C. Ryan4Brian J. Smith5Department of Physics and Oregon Center for Optical, Molecular, and Quantum Science, University of Oregon, Eugene, OR 97403, USAPacific Northwest National Laboratory, Richland, WA 99354, USAOregon Glacier Institute, Corvallis, OR 97330, USADepartment of Geography, University of Oregon, Eugene, OR 97403, USADepartment of Geography, University of Oregon, Eugene, OR 97403, USADepartment of Physics and Oregon Center for Optical, Molecular, and Quantum Science, University of Oregon, Eugene, OR 97403, USAThe production of meltwater from glacier ice, which is exposed at the margins of land ice during the summer, is responsible for a large proportion of glacier mass loss. The rate of meltwater production from glacier ice is especially sensitive to its physical structure and chemical composition which combine to determine the albedo of glacier ice. However, the optical properties of near-surface glacier ice are not well known since most prior work has focused on laboratory-grown ice or deep cores. Here, we demonstrate a measurement technique based on diffuse propagation of nanosecond-duration laser pulses in near-surface glacier ice that enables the independent measurement of the scattering and absorption coefficients, allowing for a complete description of the processes governing radiative transfer. We employ a photon-counting detector to overcome the high losses associated with diffuse optics. The instrument is highly portable and rugged, making it optimally suited for deployment in remote regions. A set of measurements taken on Crook and Collier Glaciers, Oregon, serves as a demonstration of the technique. These measurements provide insight into both physical structure and composition of near-surface glacier ice and open new avenues for the analysis of light-absorbing impurities and remote sensing of the cryosphere.https://www.cambridge.org/core/product/identifier/S002214302200034X/type/journal_articleBlue iceglaciological instruments and methodsice physicsremote sensing |
| spellingShingle | Markus Allgaier Matthew G. Cooper Anders E. Carlson Sarah W. Cooley Jonathan C. Ryan Brian J. Smith Direct measurement of optical properties of glacier ice using a photon-counting diffuse LiDAR Journal of Glaciology Blue ice glaciological instruments and methods ice physics remote sensing |
| title | Direct measurement of optical properties of glacier ice using a photon-counting diffuse LiDAR |
| title_full | Direct measurement of optical properties of glacier ice using a photon-counting diffuse LiDAR |
| title_fullStr | Direct measurement of optical properties of glacier ice using a photon-counting diffuse LiDAR |
| title_full_unstemmed | Direct measurement of optical properties of glacier ice using a photon-counting diffuse LiDAR |
| title_short | Direct measurement of optical properties of glacier ice using a photon-counting diffuse LiDAR |
| title_sort | direct measurement of optical properties of glacier ice using a photon counting diffuse lidar |
| topic | Blue ice glaciological instruments and methods ice physics remote sensing |
| url | https://www.cambridge.org/core/product/identifier/S002214302200034X/type/journal_article |
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