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| Titel |
Vertical profile and aerosol size distribution measurements in Iceland (LOAC) |
| VerfasserIn |
Pavla Dagsson Waldhauserova, Haraldur Ólafsson, Ólafur Arnalds, Jean-Baptiste Renard, Damien Vignelles, Nicolas Verdier |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250093744
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| Publikation (Nr.) |
 EGU/EGU2014-8765.pdf |
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| Zusammenfassung |
| Cold climate and high latitudes regions contain important dust sources where dust is
frequently emitted, foremost from glacially-derived sediments of riverbeds or ice-proximal
areas (Arnalds, 2010; Bullard, 2013). Iceland is probably the most active dust source in the
arctic/sub-arctic region (Dagsson-Waldhauserova, 2013). The frequency of days
with suspended dust exceeds 34 dust days annually. Icelandic dust is of volcanic
origin; it is very dark in colour and contains sharp-tipped shards with bubbles. Such
properties allow even large particles to be easily transported long distances. Thus,
there is a need to better understand the spatial and temporal variability of these
dusts.
Two launch campaigns of the Light Optical Aerosols Counter (LOAC) were conducted in
Iceland with meteorological balloons. LOAC use a new optical design that allows to
retrieve the size concentrations in 19 size classes between 0.2 and 100 microm, and
to provide an estimate of the main nature of aerosols. Vertical stratification and
aerosol composition of the subarctic atmosphere was studied in detail. The July 2011
launch represented clean non-dusty season with low winds while the November 2013
launch was conducted during the high winds after dusty period. For the winter
flight (performed from Reykjavik), the nature of aerosols strongly changed with
altitude. In particular, a thin layer of volcanic dust was observed at an altitude of 1
km.
Further LOAC measurements are needed to understand the implication of Icelandic dust
to the Arctic warming and climate change. A new campaign of LAOC launches is planned for
May 2014.
Reference:
Arnalds, O., 2010. Dust sources and deposition of aeolian materials in Iceland. Icelandic
Agricultural Sciences 23, 3-21.
Bullard, J.E., 2013. Contemporary glacigenic inputs to the dust cycle. Earth Surface
Processes and Landforms 38, 71-89.
Dagsson-Waldhauserova, P., Arnalds O., Olafsson H. 2013. Long-term frequency and
characteristics of dust storm events in Northeast Iceland (1949-2011). Atmospheric
Environment 77:117-127. |
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