Monte Carlo modeling and measurements of actinic flux levels in Summit, Greenland snowpack
Knowledge of actinic flux levels in snowpack is needed to find the influence of snowpack photochemical processes on atmospheric composition. Measurements show that while < 0.2% of direct UV and visible light is transmitted through 0.7cm of snowpack, downwelling actinic flux levels are at least 10...
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ftmichigantuniv:oai:digitalcommons.mtu.edu:michigantech-p-26969 2023-05-15T16:28:00+02:00 Monte Carlo modeling and measurements of actinic flux levels in Summit, Greenland snowpack Peterson, Matthew Barber, Douglas Green, Sarah 2002-06-24T07:00:00Z https://digitalcommons.mtu.edu/michigantech-p/7667 https://doi.org/10.1016/S1352-2310(02)00133-4 unknown Digital Commons @ Michigan Tech https://digitalcommons.mtu.edu/michigantech-p/7667 https://doi.org/10.1016/S1352-2310(02)00133-4 Michigan Tech Publications Ice Photochemistry Radiative transfer Radiometer Snow text 2002 ftmichigantuniv https://doi.org/10.1016/S1352-2310(02)00133-4 2022-01-23T10:15:39Z Knowledge of actinic flux levels in snowpack is needed to find the influence of snowpack photochemical processes on atmospheric composition. Measurements show that while < 0.2% of direct UV and visible light is transmitted through 0.7cm of snowpack, downwelling actinic flux levels are at least 10% of incident levels at a depth of 10cm within the snowpack. This results from the highly forward-scattering nature of the snowgrains within the snowpack. A 1-D Monte Carlo model of photon scattering from, and absorption in, snowgrains accurately simulates relative actinic flux levels in a horizontally homogeneous, vertically layered representation of the upper meter of Summit, Greenland snowpack. The resulting relative actinic flux levels may be used with other measurements, or with other radiative transfer models, to estimate absolute actinic flux levels within the snowpack at Summit. Results from the 1-D Monte Carlo model also demonstrate that buried radiometers which completely block upward scattered light from lower layers observe e-folding depths that may be more than an order of magnitude lower than actual values. Additional simulations with a 2- or 3-D Monte Carlo model are needed to quantify the magnitude of this effect for partial blocking of scattered light. © 2002 Elsevier Science Ltd. All rights reserved. Text Greenland Michigan Technological University: Digital Commons @ Michigan Tech Greenland Atmospheric Environment 36 15-16 2545 2551 |
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Open Polar |
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Michigan Technological University: Digital Commons @ Michigan Tech |
op_collection_id |
ftmichigantuniv |
language |
unknown |
topic |
Ice Photochemistry Radiative transfer Radiometer Snow |
spellingShingle |
Ice Photochemistry Radiative transfer Radiometer Snow Peterson, Matthew Barber, Douglas Green, Sarah Monte Carlo modeling and measurements of actinic flux levels in Summit, Greenland snowpack |
topic_facet |
Ice Photochemistry Radiative transfer Radiometer Snow |
description |
Knowledge of actinic flux levels in snowpack is needed to find the influence of snowpack photochemical processes on atmospheric composition. Measurements show that while < 0.2% of direct UV and visible light is transmitted through 0.7cm of snowpack, downwelling actinic flux levels are at least 10% of incident levels at a depth of 10cm within the snowpack. This results from the highly forward-scattering nature of the snowgrains within the snowpack. A 1-D Monte Carlo model of photon scattering from, and absorption in, snowgrains accurately simulates relative actinic flux levels in a horizontally homogeneous, vertically layered representation of the upper meter of Summit, Greenland snowpack. The resulting relative actinic flux levels may be used with other measurements, or with other radiative transfer models, to estimate absolute actinic flux levels within the snowpack at Summit. Results from the 1-D Monte Carlo model also demonstrate that buried radiometers which completely block upward scattered light from lower layers observe e-folding depths that may be more than an order of magnitude lower than actual values. Additional simulations with a 2- or 3-D Monte Carlo model are needed to quantify the magnitude of this effect for partial blocking of scattered light. © 2002 Elsevier Science Ltd. All rights reserved. |
format |
Text |
author |
Peterson, Matthew Barber, Douglas Green, Sarah |
author_facet |
Peterson, Matthew Barber, Douglas Green, Sarah |
author_sort |
Peterson, Matthew |
title |
Monte Carlo modeling and measurements of actinic flux levels in Summit, Greenland snowpack |
title_short |
Monte Carlo modeling and measurements of actinic flux levels in Summit, Greenland snowpack |
title_full |
Monte Carlo modeling and measurements of actinic flux levels in Summit, Greenland snowpack |
title_fullStr |
Monte Carlo modeling and measurements of actinic flux levels in Summit, Greenland snowpack |
title_full_unstemmed |
Monte Carlo modeling and measurements of actinic flux levels in Summit, Greenland snowpack |
title_sort |
monte carlo modeling and measurements of actinic flux levels in summit, greenland snowpack |
publisher |
Digital Commons @ Michigan Tech |
publishDate |
2002 |
url |
https://digitalcommons.mtu.edu/michigantech-p/7667 https://doi.org/10.1016/S1352-2310(02)00133-4 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Michigan Tech Publications |
op_relation |
https://digitalcommons.mtu.edu/michigantech-p/7667 https://doi.org/10.1016/S1352-2310(02)00133-4 |
op_doi |
https://doi.org/10.1016/S1352-2310(02)00133-4 |
container_title |
Atmospheric Environment |
container_volume |
36 |
container_issue |
15-16 |
container_start_page |
2545 |
op_container_end_page |
2551 |
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1766017615445098496 |