Importance of longwave emissions from adjacent terrain on patterns of tropical glacier melt and recession
Tropical glaciers constitute an important source of water for downstream populations. However, our understanding of glacial melt processes is still limited. One observed process that has not yet been quantified for tropical glaciers is the enhanced melt caused by the longwave emission transfer. Here...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Cambridge University Press
2018-02-01
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| Series: | Journal of Glaciology |
| Subjects: | |
| Online Access: | https://www.cambridge.org/core/product/identifier/S0022143017000855/type/journal_article |
| _version_ | 1811155852894142464 |
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| author | CAROLINE AUBRY-WAKE DORIAN ZÉPHIR MICHEL BARAER JEFFREY M. McKENZIE BRYAN G. MARK |
| author_facet | CAROLINE AUBRY-WAKE DORIAN ZÉPHIR MICHEL BARAER JEFFREY M. McKENZIE BRYAN G. MARK |
| author_sort | CAROLINE AUBRY-WAKE |
| collection | DOAJ |
| description | Tropical glaciers constitute an important source of water for downstream populations. However, our understanding of glacial melt processes is still limited. One observed process that has not yet been quantified for tropical glaciers is the enhanced melt caused by the longwave emission transfer. Here, we use high-resolution surface temperatures obtained from the thermal infrared imagery of the Cuchillacocha Glacier, in the Cordillera Blanca, Peru in June 2014 to calculate a margin longwave flux. This longwave flux, reaching the glacier margin from the adjacent exposed rock, varies between 81 and 120 W m−2 daily. This flux is incorporated into a physically-based melt model to assess the net radiation budget at the modeled glacier margin. The simulation results show an increase in the energy available for melt by an average of 106 W m−2 during the day when compared with the simulation where the LW
margin
flux is not accounted for. This value represents an increase in ablation of ~1.7 m at the glacier margin for the duration of the dry season. This study suggests that including the quantification of the glacier margin longwave flux in physically-based melt models results in an improved assessment of tropical glacier energy budget and meltwater generation. |
| first_indexed | 2024-04-10T04:40:35Z |
| format | Article |
| id | doaj.art-421b4468270a47b69f877aba0facc634 |
| institution | Directory Open Access Journal |
| issn | 0022-1430 1727-5652 |
| language | English |
| last_indexed | 2024-04-10T04:40:35Z |
| publishDate | 2018-02-01 |
| publisher | Cambridge University Press |
| record_format | Article |
| series | Journal of Glaciology |
| spelling | doaj.art-421b4468270a47b69f877aba0facc6342023-03-09T12:40:29ZengCambridge University PressJournal of Glaciology0022-14301727-56522018-02-0164496010.1017/jog.2017.85Importance of longwave emissions from adjacent terrain on patterns of tropical glacier melt and recessionCAROLINE AUBRY-WAKE0DORIAN ZÉPHIR1MICHEL BARAER2JEFFREY M. McKENZIE3BRYAN G. MARK4https://orcid.org/0000-0002-4500-7957Department of Earth and Planetary Sciences, McGill University, Montréal, Québec, Canada Centre for Hydrology, University of Saskatchewan, Saskatoon, Saskatchewan, CanadaDépartement de génie de la construction, École de Technologie Supérieure, Montréal, Québec, CanadaDépartement de génie de la construction, École de Technologie Supérieure, Montréal, Québec, CanadaDepartment of Earth and Planetary Sciences, McGill University, Montréal, Québec, CanadaDepartment of Geography, The Ohio State University, Columbus, OH, USATropical glaciers constitute an important source of water for downstream populations. However, our understanding of glacial melt processes is still limited. One observed process that has not yet been quantified for tropical glaciers is the enhanced melt caused by the longwave emission transfer. Here, we use high-resolution surface temperatures obtained from the thermal infrared imagery of the Cuchillacocha Glacier, in the Cordillera Blanca, Peru in June 2014 to calculate a margin longwave flux. This longwave flux, reaching the glacier margin from the adjacent exposed rock, varies between 81 and 120 W m−2 daily. This flux is incorporated into a physically-based melt model to assess the net radiation budget at the modeled glacier margin. The simulation results show an increase in the energy available for melt by an average of 106 W m−2 during the day when compared with the simulation where the LW margin flux is not accounted for. This value represents an increase in ablation of ~1.7 m at the glacier margin for the duration of the dry season. This study suggests that including the quantification of the glacier margin longwave flux in physically-based melt models results in an improved assessment of tropical glacier energy budget and meltwater generation.https://www.cambridge.org/core/product/identifier/S0022143017000855/type/journal_articleenergy balancemelt – surfacemountain glacierstropical glaciology |
| spellingShingle | CAROLINE AUBRY-WAKE DORIAN ZÉPHIR MICHEL BARAER JEFFREY M. McKENZIE BRYAN G. MARK Importance of longwave emissions from adjacent terrain on patterns of tropical glacier melt and recession Journal of Glaciology energy balance melt – surface mountain glaciers tropical glaciology |
| title | Importance of longwave emissions from adjacent terrain on patterns of tropical glacier melt and recession |
| title_full | Importance of longwave emissions from adjacent terrain on patterns of tropical glacier melt and recession |
| title_fullStr | Importance of longwave emissions from adjacent terrain on patterns of tropical glacier melt and recession |
| title_full_unstemmed | Importance of longwave emissions from adjacent terrain on patterns of tropical glacier melt and recession |
| title_short | Importance of longwave emissions from adjacent terrain on patterns of tropical glacier melt and recession |
| title_sort | importance of longwave emissions from adjacent terrain on patterns of tropical glacier melt and recession |
| topic | energy balance melt – surface mountain glaciers tropical glaciology |
| url | https://www.cambridge.org/core/product/identifier/S0022143017000855/type/journal_article |
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