Meteoric smoke deposition in the polar regions: A comparison of measurements with global atmospheric models
The accumulation rate of meteoric smoke particles (MSPs) in ice cores-determined from the trace elements Ir and Pt, and superparamagnetic Fe particles-is significantly higher than expected from the measured vertical fluxes of Na and Fe atoms in the upper mesosphere and the surface deposition of cosm...
Published in: | Journal of Geophysical Research: Atmospheres |
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Language: | English |
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Online Access: | https://doi.org/10.1002/2017JD027143 |
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ftncar:oai:drupal-site.org:articles_21441 2023-09-05T13:14:15+02:00 Meteoric smoke deposition in the polar regions: A comparison of measurements with global atmospheric models Brooke, James S. A. (author) Feng, Wuhu (author) Carrillo-Sánchez, Juan Diego (author) Mann, Graham W. (author) James, Alexander D. (author) Bardeen, Charles G. (author) Plane, John M. C. (author) 2017-10-16 https://doi.org/10.1002/2017JD027143 en eng Journal of Geophysical Research: Atmospheres--J. Geophys. Res. Atmos.--2169897X articles:21441 ark:/85065/d7fn18vm doi:10.1002/2017JD027143 Copyright 2017 American Geophysical Union. article Text 2017 ftncar https://doi.org/10.1002/2017JD027143 2023-08-14T18:47:58Z The accumulation rate of meteoric smoke particles (MSPs) in ice cores-determined from the trace elements Ir and Pt, and superparamagnetic Fe particles-is significantly higher than expected from the measured vertical fluxes of Na and Fe atoms in the upper mesosphere and the surface deposition of cosmic spherules. The Whole Atmosphere Community Climate Model with the Community Aerosol and Radiation Model for Atmospheres has been used to simulate MSP production, transport, and deposition, using a global MSP input of 7.9 t d(-1) based on these other measurements. The modeled MSP deposition rates are smaller than the measurements by factors of similar to 32 in Greenland and similar to 12 in Antarctica, even after reanalysis of the Ir/Pt ice core data with inclusion of a volcanic source. Variations of the model deposition scheme and use of the United Kingdom Chemistry and Aerosols model do not improve the agreement. Direct removal of MSP-nucleated polar stratospheric cloud particles to the surface gives much better agreement, but would result in an unfeasibly high rate of nitrate deposition. The unablated fraction of cosmic dust (similar to 35 t d(-1)) would provide sufficient Ir and Pt to account for the Antarctic measurements, but the relatively small flux of these large (> 3 mu m) particles would lead to greater variability in the ice core measurements than is observed, although this would be partly offset if significant fragmentation of cosmic dust particles occurred during atmospheric entry. Future directions to resolve these discrepancies between models and measurements are also discussed. Article in Journal/Newspaper Antarc* Antarctic Antarctica Greenland ice core OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Antarctic The Antarctic Greenland Journal of Geophysical Research: Atmospheres 122 20 11,112 11,130 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
The accumulation rate of meteoric smoke particles (MSPs) in ice cores-determined from the trace elements Ir and Pt, and superparamagnetic Fe particles-is significantly higher than expected from the measured vertical fluxes of Na and Fe atoms in the upper mesosphere and the surface deposition of cosmic spherules. The Whole Atmosphere Community Climate Model with the Community Aerosol and Radiation Model for Atmospheres has been used to simulate MSP production, transport, and deposition, using a global MSP input of 7.9 t d(-1) based on these other measurements. The modeled MSP deposition rates are smaller than the measurements by factors of similar to 32 in Greenland and similar to 12 in Antarctica, even after reanalysis of the Ir/Pt ice core data with inclusion of a volcanic source. Variations of the model deposition scheme and use of the United Kingdom Chemistry and Aerosols model do not improve the agreement. Direct removal of MSP-nucleated polar stratospheric cloud particles to the surface gives much better agreement, but would result in an unfeasibly high rate of nitrate deposition. The unablated fraction of cosmic dust (similar to 35 t d(-1)) would provide sufficient Ir and Pt to account for the Antarctic measurements, but the relatively small flux of these large (> 3 mu m) particles would lead to greater variability in the ice core measurements than is observed, although this would be partly offset if significant fragmentation of cosmic dust particles occurred during atmospheric entry. Future directions to resolve these discrepancies between models and measurements are also discussed. |
author2 |
Brooke, James S. A. (author) Feng, Wuhu (author) Carrillo-Sánchez, Juan Diego (author) Mann, Graham W. (author) James, Alexander D. (author) Bardeen, Charles G. (author) Plane, John M. C. (author) |
format |
Article in Journal/Newspaper |
title |
Meteoric smoke deposition in the polar regions: A comparison of measurements with global atmospheric models |
spellingShingle |
Meteoric smoke deposition in the polar regions: A comparison of measurements with global atmospheric models |
title_short |
Meteoric smoke deposition in the polar regions: A comparison of measurements with global atmospheric models |
title_full |
Meteoric smoke deposition in the polar regions: A comparison of measurements with global atmospheric models |
title_fullStr |
Meteoric smoke deposition in the polar regions: A comparison of measurements with global atmospheric models |
title_full_unstemmed |
Meteoric smoke deposition in the polar regions: A comparison of measurements with global atmospheric models |
title_sort |
meteoric smoke deposition in the polar regions: a comparison of measurements with global atmospheric models |
publishDate |
2017 |
url |
https://doi.org/10.1002/2017JD027143 |
geographic |
Antarctic The Antarctic Greenland |
geographic_facet |
Antarctic The Antarctic Greenland |
genre |
Antarc* Antarctic Antarctica Greenland ice core |
genre_facet |
Antarc* Antarctic Antarctica Greenland ice core |
op_relation |
Journal of Geophysical Research: Atmospheres--J. Geophys. Res. Atmos.--2169897X articles:21441 ark:/85065/d7fn18vm doi:10.1002/2017JD027143 |
op_rights |
Copyright 2017 American Geophysical Union. |
op_doi |
https://doi.org/10.1002/2017JD027143 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
122 |
container_issue |
20 |
container_start_page |
11,112 |
op_container_end_page |
11,130 |
_version_ |
1776205266397691904 |