Regional measurements and modeling of windblown agricultural dust: The Columbia Plateau PM10 Program
Identifieur interne : 001475 ( Main/Merge ); précédent : 001474; suivant : 001476Regional measurements and modeling of windblown agricultural dust: The Columbia Plateau PM10 Program
Auteurs : Candis Claiborn ; Brian Lamb ; April Miller ; Jim Beseda ; Bryan Clode ; Joe Vaughan ; Liping Kang ; Carol NewvineSource :
- Journal of Geophysical Research: Atmospheres [ 0148-0227 ] ; 1998-08-27.
Abstract
The Columbia Plateau PM10 Program [CP3] is a multi‐investigator study of windblown dust in the Pacific Northwest with an emphasis upon the role of agricultural lands in regional dust storms. Ambient measurements of PM10 within the source areas of the central basin of Washington during several autumn dust periods show that typical background concentrations [nonwind‐event periods] decrease from an average of 34 μg m−3 in early fall to 10 μg m−3 in late fall. During wind events, ambient concentrations at downwind urban receptors can exceed 500 μg m−3 on an hourly basis, with 24 hour averaged values as high as 300 μg m−3. Particle counts during wind events are enhanced by as much as a factor of 5 for particle sizes greater than 5 μm, and also for sizes between 1 and 5 μm compared to nonwindy periods. Analysis of the synoptic conditions which exist during these dust storms showed a common situation where a surface low is moving rapidly across British Columbia while a surface high is positioned in the Great Basin of Nevada. A regional windblown dust air quality model, developed for the CP3 study, predicts large dust plumes stretching across eastern Washington with maximum concentrations in the source regions exceeding 10,000 μg m−3. Total mass emissions during a storm are estimated to equal 100 Gg dy−1, which represents about 1% of recent estimates of the global annual dust emission rate. In the initial applications of the model, available PM10 observations are used to calibrate the dust emission algorithm. Changes in the dust constant for two modeled events are consistent with changes in soil cover and accumulated precipitation between an early fall event and a late fall event. The estimated fluxes are in a range similar to those in the literature but appear to be much less than estimated from global modeling of recently disturbed soils.
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DOI: 10.1029/98JD00046
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Regional measurements and modeling of windblown agricultural dust: The Columbia Plateau PM10 Program</title><author wicri:is="90%"><name sortKey="Claiborn, Candis" sort="Claiborn, Candis" uniqKey="Claiborn C" first="Candis" last="Claiborn">Candis Claiborn</name></author><author wicri:is="90%"><name sortKey="Lamb, Brian" sort="Lamb, Brian" uniqKey="Lamb B" first="Brian" last="Lamb">Brian Lamb</name></author><author wicri:is="90%"><name sortKey="Miller, April" sort="Miller, April" uniqKey="Miller A" first="April" last="Miller">April Miller</name></author><author wicri:is="90%"><name sortKey="Beseda, Jim" sort="Beseda, Jim" uniqKey="Beseda J" first="Jim" last="Beseda">Jim Beseda</name></author><author wicri:is="90%"><name sortKey="Clode, Bryan" sort="Clode, Bryan" uniqKey="Clode B" first="Bryan" last="Clode">Bryan Clode</name></author><author wicri:is="90%"><name sortKey="Vaughan, Joe" sort="Vaughan, Joe" uniqKey="Vaughan J" first="Joe" last="Vaughan">Joe Vaughan</name></author><author wicri:is="90%"><name sortKey="Kang, Liping" sort="Kang, Liping" uniqKey="Kang L" first="Liping" last="Kang">Liping Kang</name></author><author wicri:is="90%"><name sortKey="Newvine, Carol" sort="Newvine, Carol" uniqKey="Newvine C" first="Carol" last="Newvine">Carol Newvine</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:2F1010BE3582EF9D745A6864C41F28005A073A3D</idno><date when="1998" year="1998">1998</date><idno type="doi">10.1029/98JD00046</idno><idno type="url">https://api.istex.fr/document/2F1010BE3582EF9D745A6864C41F28005A073A3D/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">000F59</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">000F59</idno><idno type="wicri:Area/Istex/Curation">000E94</idno><idno type="wicri:Area/Istex/Checkpoint">000C42</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Checkpoint">000C42</idno><idno type="wicri:doubleKey">0148-0227:1998:Claiborn C:regional:measurements:and</idno><idno type="wicri:Area/Main/Merge">001475</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Regional measurements and modeling of windblown agricultural dust: The Columbia Plateau PM10 Program</title><author wicri:is="90%"><name sortKey="Claiborn, Candis" sort="Claiborn, Candis" uniqKey="Claiborn C" first="Candis" last="Claiborn">Candis Claiborn</name></author><author wicri:is="90%"><name sortKey="Lamb, Brian" sort="Lamb, Brian" uniqKey="Lamb B" first="Brian" last="Lamb">Brian Lamb</name></author><author wicri:is="90%"><name sortKey="Miller, April" sort="Miller, April" uniqKey="Miller A" first="April" last="Miller">April Miller</name></author><author wicri:is="90%"><name sortKey="Beseda, Jim" sort="Beseda, Jim" uniqKey="Beseda J" first="Jim" last="Beseda">Jim Beseda</name></author><author wicri:is="90%"><name sortKey="Clode, Bryan" sort="Clode, Bryan" uniqKey="Clode B" first="Bryan" last="Clode">Bryan Clode</name></author><author wicri:is="90%"><name sortKey="Vaughan, Joe" sort="Vaughan, Joe" uniqKey="Vaughan J" first="Joe" last="Vaughan">Joe Vaughan</name></author><author wicri:is="90%"><name sortKey="Kang, Liping" sort="Kang, Liping" uniqKey="Kang L" first="Liping" last="Kang">Liping Kang</name></author><author wicri:is="90%"><name sortKey="Newvine, Carol" sort="Newvine, Carol" uniqKey="Newvine C" first="Carol" last="Newvine">Carol Newvine</name></author></analytic><monogr></monogr><series><title level="j">Journal of Geophysical Research: Atmospheres</title><title level="j" type="abbrev">J. Geophys. Res.</title><idno type="ISSN">0148-0227</idno><idno type="eISSN">2156-2202</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="1998-08-27">1998-08-27</date><biblScope unit="volume">103</biblScope><biblScope unit="issue">D16</biblScope><biblScope unit="page" from="19753">19753</biblScope><biblScope unit="page" to="19767">19767</biblScope></imprint><idno type="ISSN">0148-0227</idno></series><idno type="istex">2F1010BE3582EF9D745A6864C41F28005A073A3D</idno><idno type="DOI">10.1029/98JD00046</idno><idno type="ArticleID">98JD00046</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0148-0227</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">The Columbia Plateau PM10 Program [CP3] is a multi‐investigator study of windblown dust in the Pacific Northwest with an emphasis upon the role of agricultural lands in regional dust storms. Ambient measurements of PM10 within the source areas of the central basin of Washington during several autumn dust periods show that typical background concentrations [nonwind‐event periods] decrease from an average of 34 μg m−3 in early fall to 10 μg m−3 in late fall. During wind events, ambient concentrations at downwind urban receptors can exceed 500 μg m−3 on an hourly basis, with 24 hour averaged values as high as 300 μg m−3. Particle counts during wind events are enhanced by as much as a factor of 5 for particle sizes greater than 5 μm, and also for sizes between 1 and 5 μm compared to nonwindy periods. Analysis of the synoptic conditions which exist during these dust storms showed a common situation where a surface low is moving rapidly across British Columbia while a surface high is positioned in the Great Basin of Nevada. A regional windblown dust air quality model, developed for the CP3 study, predicts large dust plumes stretching across eastern Washington with maximum concentrations in the source regions exceeding 10,000 μg m−3. Total mass emissions during a storm are estimated to equal 100 Gg dy−1, which represents about 1% of recent estimates of the global annual dust emission rate. In the initial applications of the model, available PM10 observations are used to calibrate the dust emission algorithm. Changes in the dust constant for two modeled events are consistent with changes in soil cover and accumulated precipitation between an early fall event and a late fall event. The estimated fluxes are in a range similar to those in the literature but appear to be much less than estimated from global modeling of recently disturbed soils.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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