Isotopic Evidence for Lateral Flow and Diffusive Transport, but Not Sublimation, in a Sloped Seasonal Snowpack, Idaho, USA
Oxygen and hydrogen isotopes in snow were measured in weekly profiles during the growth and decline of a sloped subalpine snowpack, southern Idaho, 2011–2012. Isotopic steps (10‰, δ18O; 80‰, δD) were preserved relative to physical markers throughout the season, albeit with some diffusive smoothing....
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ftboisestateu:oai:scholarworks.boisestate.edu:geo_facpubs-1306 2023-10-29T02:37:03+01:00 Isotopic Evidence for Lateral Flow and Diffusive Transport, but Not Sublimation, in a Sloped Seasonal Snowpack, Idaho, USA Evans, Samantha L. Flores, Alejandro N. Heilig, Achim Kohn, Matthew J. Marshall, Hans-Peter McNamara, James P. 2016-04-16T07:00:00Z application/pdf https://scholarworks.boisestate.edu/geo_facpubs/305 https://scholarworks.boisestate.edu/context/geo_facpubs/article/1306/viewcontent/Evans___Isotopic_evidence_for_lateral.pdf unknown ScholarWorks https://scholarworks.boisestate.edu/geo_facpubs/305 https://scholarworks.boisestate.edu/context/geo_facpubs/article/1306/viewcontent/Evans___Isotopic_evidence_for_lateral.pdf This document was originally published in Geophysical Research Letters by Wiley on behalf of the American Geophysical Union. Copyright restrictions may apply. doi: 10.1002/2015GL067605 Geosciences Faculty Publications and Presentations stable isotope snow ice core hydrograph Earth Sciences Geophysics and Seismology text 2016 ftboisestateu 2023-09-29T15:14:51Z Oxygen and hydrogen isotopes in snow were measured in weekly profiles during the growth and decline of a sloped subalpine snowpack, southern Idaho, 2011–2012. Isotopic steps (10‰, δ18O; 80‰, δD) were preserved relative to physical markers throughout the season, albeit with some diffusive smoothing. Melting stripped off upper layers without shifting isotopes within the snowpack. Meltwater is in isotopic equilibrium with snow at the top but not with snow at each respective collection height. Transport of meltwater occurred primarily along pipes and lateral flow paths allowing the snowpack to melt initially in reverse stratigraphic order. Isotope diffusivities are ~2 orders of magnitude faster than estimated from experiments but can be explained by higher temperature and porosity. A better understanding of how snowmelt isotopes change during meltout improves hydrograph separation methods, whereas constraints on isotope diffusivities under warm conditions improve models of ice core records in low-latitude settings. Text ice core Boise State University: Scholar Works |
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Boise State University: Scholar Works |
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ftboisestateu |
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unknown |
topic |
stable isotope snow ice core hydrograph Earth Sciences Geophysics and Seismology |
spellingShingle |
stable isotope snow ice core hydrograph Earth Sciences Geophysics and Seismology Evans, Samantha L. Flores, Alejandro N. Heilig, Achim Kohn, Matthew J. Marshall, Hans-Peter McNamara, James P. Isotopic Evidence for Lateral Flow and Diffusive Transport, but Not Sublimation, in a Sloped Seasonal Snowpack, Idaho, USA |
topic_facet |
stable isotope snow ice core hydrograph Earth Sciences Geophysics and Seismology |
description |
Oxygen and hydrogen isotopes in snow were measured in weekly profiles during the growth and decline of a sloped subalpine snowpack, southern Idaho, 2011–2012. Isotopic steps (10‰, δ18O; 80‰, δD) were preserved relative to physical markers throughout the season, albeit with some diffusive smoothing. Melting stripped off upper layers without shifting isotopes within the snowpack. Meltwater is in isotopic equilibrium with snow at the top but not with snow at each respective collection height. Transport of meltwater occurred primarily along pipes and lateral flow paths allowing the snowpack to melt initially in reverse stratigraphic order. Isotope diffusivities are ~2 orders of magnitude faster than estimated from experiments but can be explained by higher temperature and porosity. A better understanding of how snowmelt isotopes change during meltout improves hydrograph separation methods, whereas constraints on isotope diffusivities under warm conditions improve models of ice core records in low-latitude settings. |
format |
Text |
author |
Evans, Samantha L. Flores, Alejandro N. Heilig, Achim Kohn, Matthew J. Marshall, Hans-Peter McNamara, James P. |
author_facet |
Evans, Samantha L. Flores, Alejandro N. Heilig, Achim Kohn, Matthew J. Marshall, Hans-Peter McNamara, James P. |
author_sort |
Evans, Samantha L. |
title |
Isotopic Evidence for Lateral Flow and Diffusive Transport, but Not Sublimation, in a Sloped Seasonal Snowpack, Idaho, USA |
title_short |
Isotopic Evidence for Lateral Flow and Diffusive Transport, but Not Sublimation, in a Sloped Seasonal Snowpack, Idaho, USA |
title_full |
Isotopic Evidence for Lateral Flow and Diffusive Transport, but Not Sublimation, in a Sloped Seasonal Snowpack, Idaho, USA |
title_fullStr |
Isotopic Evidence for Lateral Flow and Diffusive Transport, but Not Sublimation, in a Sloped Seasonal Snowpack, Idaho, USA |
title_full_unstemmed |
Isotopic Evidence for Lateral Flow and Diffusive Transport, but Not Sublimation, in a Sloped Seasonal Snowpack, Idaho, USA |
title_sort |
isotopic evidence for lateral flow and diffusive transport, but not sublimation, in a sloped seasonal snowpack, idaho, usa |
publisher |
ScholarWorks |
publishDate |
2016 |
url |
https://scholarworks.boisestate.edu/geo_facpubs/305 https://scholarworks.boisestate.edu/context/geo_facpubs/article/1306/viewcontent/Evans___Isotopic_evidence_for_lateral.pdf |
genre |
ice core |
genre_facet |
ice core |
op_source |
Geosciences Faculty Publications and Presentations |
op_relation |
https://scholarworks.boisestate.edu/geo_facpubs/305 https://scholarworks.boisestate.edu/context/geo_facpubs/article/1306/viewcontent/Evans___Isotopic_evidence_for_lateral.pdf |
op_rights |
This document was originally published in Geophysical Research Letters by Wiley on behalf of the American Geophysical Union. Copyright restrictions may apply. doi: 10.1002/2015GL067605 |
_version_ |
1781061386359537664 |