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Effects of firn ventilation on isotopic exchange
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| Zeitschriftentitel: | Journal of Glaciology |
|---|---|
| Personen und Körperschaften: | , |
| In: | Journal of Glaciology, 50, 2004, 169, S. 183-194 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
International Glaciological Society
|
| Schlagwörter: |
| author_facet |
Neumann, Thomas A. Waddington, Edwin D. Neumann, Thomas A. Waddington, Edwin D. |
|---|---|
| author |
Neumann, Thomas A. Waddington, Edwin D. |
| spellingShingle |
Neumann, Thomas A. Waddington, Edwin D. Journal of Glaciology Effects of firn ventilation on isotopic exchange Earth-Surface Processes |
| author_sort |
neumann, thomas a. |
| spelling |
Neumann, Thomas A. Waddington, Edwin D. 0022-1430 1727-5652 International Glaciological Society Earth-Surface Processes http://dx.doi.org/10.3189/172756504781830150 <jats:title>Abstract</jats:title><jats:p>A new model of isotopic diffusion in the upper few meters of firn tracks the isotopic composition of both the ice matrix and the pore-space vapor through time in two dimensions. Stable isotopes in the vapor phase move through the firn by diffusion along concentration gradients and by advection. Wind-driven ventilation carries atmospheric water vapor into the firn, where it mixes with existing pore-space vapor. Unlike previous models, our model allows disequilibrium between pore-space vapor and the surrounding snow grains. We also calculate the isotopic effects of ventilation-driven sublimation and condensation in the firn. Model predictions of isotopic diffusion in firn compare favorably with existing diffusion models. Model results quantify what other investigators have suggested: isotopic change in the upper few meters is more rapid than can be explained by the Whillans and Grootes (1985) model; isotopic equilibration with atmospheric vapor is an important component of post-depositional isotopic change; and ventilation enhances isotopic exchange by creating regions of relatively rapid sublimation and condensation in the firn.</jats:p> Effects of firn ventilation on isotopic exchange Journal of Glaciology |
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International Glaciological Society, 2004 |
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International Glaciological Society, 2004 |
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Journal of Glaciology |
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| title |
Effects of firn ventilation on isotopic exchange |
| title_unstemmed |
Effects of firn ventilation on isotopic exchange |
| title_full |
Effects of firn ventilation on isotopic exchange |
| title_fullStr |
Effects of firn ventilation on isotopic exchange |
| title_full_unstemmed |
Effects of firn ventilation on isotopic exchange |
| title_short |
Effects of firn ventilation on isotopic exchange |
| title_sort |
effects of firn ventilation on isotopic exchange |
| topic |
Earth-Surface Processes |
| url |
http://dx.doi.org/10.3189/172756504781830150 |
| publishDate |
2004 |
| physical |
183-194 |
| description |
<jats:title>Abstract</jats:title><jats:p>A new model of isotopic diffusion in the upper few meters of firn tracks the isotopic composition of both the ice matrix and the pore-space vapor through time in two dimensions. Stable isotopes in the vapor phase move through the firn by diffusion along concentration gradients and by advection. Wind-driven ventilation carries atmospheric water vapor into the firn, where it mixes with existing pore-space vapor. Unlike previous models, our model allows disequilibrium between pore-space vapor and the surrounding snow grains. We also calculate the isotopic effects of ventilation-driven sublimation and condensation in the firn. Model predictions of isotopic diffusion in firn compare favorably with existing diffusion models. Model results quantify what other investigators have suggested: isotopic change in the upper few meters is more rapid than can be explained by the Whillans and Grootes (1985) model; isotopic equilibration with atmospheric vapor is an important component of post-depositional isotopic change; and ventilation enhances isotopic exchange by creating regions of relatively rapid sublimation and condensation in the firn.</jats:p> |
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| author | Neumann, Thomas A., Waddington, Edwin D. |
| author_facet | Neumann, Thomas A., Waddington, Edwin D., Neumann, Thomas A., Waddington, Edwin D. |
| author_sort | neumann, thomas a. |
| container_issue | 169 |
| container_start_page | 183 |
| container_title | Journal of Glaciology |
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| description | <jats:title>Abstract</jats:title><jats:p>A new model of isotopic diffusion in the upper few meters of firn tracks the isotopic composition of both the ice matrix and the pore-space vapor through time in two dimensions. Stable isotopes in the vapor phase move through the firn by diffusion along concentration gradients and by advection. Wind-driven ventilation carries atmospheric water vapor into the firn, where it mixes with existing pore-space vapor. Unlike previous models, our model allows disequilibrium between pore-space vapor and the surrounding snow grains. We also calculate the isotopic effects of ventilation-driven sublimation and condensation in the firn. Model predictions of isotopic diffusion in firn compare favorably with existing diffusion models. Model results quantify what other investigators have suggested: isotopic change in the upper few meters is more rapid than can be explained by the Whillans and Grootes (1985) model; isotopic equilibration with atmospheric vapor is an important component of post-depositional isotopic change; and ventilation enhances isotopic exchange by creating regions of relatively rapid sublimation and condensation in the firn.</jats:p> |
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| physical | 183-194 |
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| series | Journal of Glaciology |
| source_id | 49 |
| spelling | Neumann, Thomas A. Waddington, Edwin D. 0022-1430 1727-5652 International Glaciological Society Earth-Surface Processes http://dx.doi.org/10.3189/172756504781830150 <jats:title>Abstract</jats:title><jats:p>A new model of isotopic diffusion in the upper few meters of firn tracks the isotopic composition of both the ice matrix and the pore-space vapor through time in two dimensions. Stable isotopes in the vapor phase move through the firn by diffusion along concentration gradients and by advection. Wind-driven ventilation carries atmospheric water vapor into the firn, where it mixes with existing pore-space vapor. Unlike previous models, our model allows disequilibrium between pore-space vapor and the surrounding snow grains. We also calculate the isotopic effects of ventilation-driven sublimation and condensation in the firn. Model predictions of isotopic diffusion in firn compare favorably with existing diffusion models. Model results quantify what other investigators have suggested: isotopic change in the upper few meters is more rapid than can be explained by the Whillans and Grootes (1985) model; isotopic equilibration with atmospheric vapor is an important component of post-depositional isotopic change; and ventilation enhances isotopic exchange by creating regions of relatively rapid sublimation and condensation in the firn.</jats:p> Effects of firn ventilation on isotopic exchange Journal of Glaciology |
| spellingShingle | Neumann, Thomas A., Waddington, Edwin D., Journal of Glaciology, Effects of firn ventilation on isotopic exchange, Earth-Surface Processes |
| title | Effects of firn ventilation on isotopic exchange |
| title_full | Effects of firn ventilation on isotopic exchange |
| title_fullStr | Effects of firn ventilation on isotopic exchange |
| title_full_unstemmed | Effects of firn ventilation on isotopic exchange |
| title_short | Effects of firn ventilation on isotopic exchange |
| title_sort | effects of firn ventilation on isotopic exchange |
| title_unstemmed | Effects of firn ventilation on isotopic exchange |
| topic | Earth-Surface Processes |
| url | http://dx.doi.org/10.3189/172756504781830150 |