Search: WFRF:(Garcia Carreras Luis)
> (2014) >
Quantifying particl...
-
Rosenberg, Philip D.
(author)
Quantifying particle size and turbulent scale dependence of dust flux in the Sahara using aircraft measurements
- Article/chapterEnglish2014
Publisher, publication year, extent ...
Numbers
-
LIBRIS-ID:oai:DiVA.org:su-107048
-
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-107048URI
-
https://doi.org/10.1002/2013JD021255DOI
Supplementary language notes
-
Language:English
-
Summary in:English
Part of subdatabase
Classification
-
Subject category:ref swepub-contenttype
-
Subject category:art swepub-publicationtype
Notes
-
AuthorCount:11;
-
The first size-resolved airborne measurements of dust fluxes and the first dust flux measurements from the central Sahara are presented and compared with a parameterization by Kok (2011a). High-frequency measurements of dust size distribution were obtained from 0.16 to 300 mu m diameter, and eddy covariance fluxes were derived. This is more than an order of magnitude larger size range than previous flux estimates. Links to surface emission are provided by analysis of particle drift velocities. Number flux is described by a -2 power law between 1 and 144 mu m diameter, significantly larger than the 12 mu m upper limit suggested by Kok (2011a). For small particles, the deviation from a power law varies with terrain type and the large size cutoff is correlated with atmospheric vertical turbulent kinetic energy, suggesting control by vertical transport rather than emission processes. The measured mass flux mode is in the range 30-100 mu m. The turbulent scales important for dust flux are from 0.1 km to 1-10 km. The upper scale increases during the morning as boundary layer depth and eddy size increase. All locations where large dust fluxes were measured had large topographical variations. These features are often linked with highly erodible surface features, such as wadis or dunes. We also hypothesize that upslope flow and flow separation over such features enhance the dust flux by transporting large particles out of the saltation layer. The tendency to locate surface flux measurements in open, flat terrain means these favored dust sources have been neglected in previous studies.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
-
Parker, Douglas J.
(author)
-
Ryder, Claire L.
(author)
-
Marsham, John H.
(author)
-
Garcia-Carreras, LuisStockholms universitet,Meteorologiska institutionen (MISU)(Swepub:su)lgarc
(author)
-
Dorsey, James R.
(author)
-
Brooks, Ian M.
(author)
-
Dean, Angela R.
(author)
-
Crosier, Jonathon
(author)
-
McQuaid, James B.
(author)
-
Washington, Richard
(author)
-
Stockholms universitetMeteorologiska institutionen (MISU)
(creator_code:org_t)
Related titles
-
In:Journal of Geophysical Research - Atmospheres119:12, s. 7577-75982169-897X2169-8996
Internet link
Find in a library
To the university's database
- By the author/editor
-
Rosenberg, Phili ...
-
Parker, Douglas ...
-
Ryder, Claire L.
-
Marsham, John H.
-
Garcia-Carreras, ...
-
Dorsey, James R.
-
show more...
-
Brooks, Ian M.
-
Dean, Angela R.
-
Crosier, Jonatho ...
-
McQuaid, James B ...
-
Washington, Rich ...
-
show less...
- About the subject
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Earth and Relate ...
-
and Meteorology and ...
- Articles in the publication
-
Journal of Geoph ...
- By the university
-
Stockholm University