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Substantial contribution of northern high-latitude sources to mineral dust in the Arctic
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för miljövetenskap och analytisk kemi. Norwegian Institute for Air Research, Norway; Finnish Meteorological Institute, Finland.
Antal upphovsmän: 42016 (Engelska)Ingår i: Journal of Geophysical Research - Atmospheres, ISSN 2169-897X, E-ISSN 2169-8996, Vol. 121, nr 22, s. 13678-13697Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In the Arctic, impurities in the atmosphere and cryosphere can strongly affect the atmospheric radiation and surface energy balance. While black carbon has hence received much attention, mineral dust has been in the background. Mineral dust is not only transported into the Arctic from remote regions but also, possibly increasingly, generated in the region itself. Here we study mineral dust in the Arctic based on global transport model simulations. For this, we have developed a dust mobilization scheme in combination with the Lagrangian particle dispersion model FLEXPART. A model evaluation, based on measurements of surface concentrations and annual deposition at a number of stations and aircraft vertical profiles, shows the suitability of this model to study global dust transport. Simulations indicate that about 3% of global dust emission originates from high-latitude dust sources in the Arctic. Due to limited convection and enhanced efficiency of removal, dust emitted in these source regions is mostly deposited closer to the source than dust from for instance Asia or Africa. This leads to dominant contributions of local dust sources to total surface dust concentrations (similar to 85%) and dust deposition (similar to 90%) in the Arctic region. Dust deposition from local sources peaks in autumn, while dust deposition from remote sources occurs mainly in spring in the Arctic. With increasing altitude, remote sources become more important for dust concentrations as well as deposition. Therefore, total atmospheric dust loads in the Arctic are strongly influenced by Asian (similar to 38%) and African (similar to 32%) dust, whereas local dust contributes only 27%. Dust loads are thus largest in spring when remote dust is efficiently transported into the Arctic. Overall, our study shows that contributions of local dust sources are more important in the Arctic than previously thought, particularly with respect to surface concentrations and dust deposition.

Ort, förlag, år, upplaga, sidor
2016. Vol. 121, nr 22, s. 13678-13697
Nationell ämneskategori
Geovetenskap och miljövetenskap
Identifikatorer
URN: urn:nbn:se:su:diva-139311DOI: 10.1002/2016JD025482ISI: 000393127800026OAI: oai:DiVA.org:su-139311DiVA, id: diva2:1074232
Tillgänglig från: 2017-02-15 Skapad: 2017-02-15 Senast uppdaterad: 2017-11-29Bibliografiskt granskad

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Grythe, Henrik
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Institutionen för miljövetenskap och analytisk kemi
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Journal of Geophysical Research - Atmospheres
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Totalt: 17 träffar
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