Fine dust emissions from active sands at coastal Oceano Dunes, California
<p>Sand dunes and other active sands generally have a low content of fine grains and, therefore, are not considered to be major dust sources in current climate models. However, recent remote sensing studies have indicated that a surprisingly large fraction of dust storms are generated from reg...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2019-03-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://www.atmos-chem-phys.net/19/2947/2019/acp-19-2947-2019.pdf |
| _version_ | 1819225714998640640 |
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| author | Y. Huang J. F. Kok R. L. Martin N. Swet I. Katra T. E. Gill R. L. Reynolds L. S. Freire |
| author_facet | Y. Huang J. F. Kok R. L. Martin N. Swet I. Katra T. E. Gill R. L. Reynolds L. S. Freire |
| author_sort | Y. Huang |
| collection | DOAJ |
| description | <p>Sand dunes and other active sands generally have a low content of fine grains
and, therefore, are not considered to be major dust sources in current
climate models. However, recent remote sensing studies have indicated that a
surprisingly large fraction of dust storms are generated from regions covered
by sand dunes, leading these studies to propose that sand dunes might be
globally relevant sources of dust. To help understand dust emissions from
sand dunes and other active sands, we present in situ field measurements of
dust emission under natural saltation from a coastal sand sheet at Oceano
Dunes in California. We find that saltation drives dust emissions from this
setting that are on the low end of the range in emissions produced by
non-sandy soils for similar wind speed. Laboratory analyses of sand samples
suggest that these emissions are produced by aeolian abrasion of feldspars
and removal of clay-mineral coatings on sand grain surfaces. We further find
that this emitted dust is substantially finer than dust emitted from
non-sandy soils, which could enhance its downwind impacts on human health,
the hydrological cycle, and climate.</p> |
| first_indexed | 2024-12-23T10:14:00Z |
| format | Article |
| id | doaj.art-91d794e2e4cc4edc9c785de41d83e027 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-23T10:14:00Z |
| publishDate | 2019-03-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-91d794e2e4cc4edc9c785de41d83e0272022-12-21T17:50:52ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242019-03-01192947296410.5194/acp-19-2947-2019Fine dust emissions from active sands at coastal Oceano Dunes, CaliforniaY. Huang0J. F. Kok1R. L. Martin2N. Swet3I. Katra4T. E. Gill5R. L. Reynolds6L. S. Freire7Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, CA 90095, USADepartment of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, CA 90095, USADepartment of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, CA 90095, USADepartment of Geography and Environmental Development, Ben Gurion University of the Negev, Be'er-Sheva 84105, IsraelDepartment of Geography and Environmental Development, Ben Gurion University of the Negev, Be'er-Sheva 84105, IsraelDepartment of Geological Sciences, University of Texas at El Paso, El Paso, TX 79968, USADepartment of Earth Sciences, University of Minnesota, Minneapolis, MN 55455, USAGraduate Program in Environmental Engineering, Federal University of Paraná, Curitiba, PR 80060, Brazil<p>Sand dunes and other active sands generally have a low content of fine grains and, therefore, are not considered to be major dust sources in current climate models. However, recent remote sensing studies have indicated that a surprisingly large fraction of dust storms are generated from regions covered by sand dunes, leading these studies to propose that sand dunes might be globally relevant sources of dust. To help understand dust emissions from sand dunes and other active sands, we present in situ field measurements of dust emission under natural saltation from a coastal sand sheet at Oceano Dunes in California. We find that saltation drives dust emissions from this setting that are on the low end of the range in emissions produced by non-sandy soils for similar wind speed. Laboratory analyses of sand samples suggest that these emissions are produced by aeolian abrasion of feldspars and removal of clay-mineral coatings on sand grain surfaces. We further find that this emitted dust is substantially finer than dust emitted from non-sandy soils, which could enhance its downwind impacts on human health, the hydrological cycle, and climate.</p>https://www.atmos-chem-phys.net/19/2947/2019/acp-19-2947-2019.pdf |
| spellingShingle | Y. Huang J. F. Kok R. L. Martin N. Swet I. Katra T. E. Gill R. L. Reynolds L. S. Freire Fine dust emissions from active sands at coastal Oceano Dunes, California Atmospheric Chemistry and Physics |
| title | Fine dust emissions from active sands at coastal Oceano Dunes, California |
| title_full | Fine dust emissions from active sands at coastal Oceano Dunes, California |
| title_fullStr | Fine dust emissions from active sands at coastal Oceano Dunes, California |
| title_full_unstemmed | Fine dust emissions from active sands at coastal Oceano Dunes, California |
| title_short | Fine dust emissions from active sands at coastal Oceano Dunes, California |
| title_sort | fine dust emissions from active sands at coastal oceano dunes california |
| url | https://www.atmos-chem-phys.net/19/2947/2019/acp-19-2947-2019.pdf |
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