| Autor: |
N.J. Clark, Rodney B. Smith |
| Rok vydání: |
1988 |
| Předmět: |
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| Zdroj: |
Atmospheric Research. 22:91-104 |
| ISSN: |
0169-8095 |
| DOI: |
10.1016/0169-8095(88)90001-4 |
| Popis: |
Lake Eyre is an ephemeral salt lake in arid country 400 km from the sea. The contributions to the total atmospheric aerosol sodium from sea-salt and lake-salt were determined close to the lake over a four-day sampling period in May 1984. Measurements at the lake site detected significant salt aerosol of marine origin. No conclusive evidence for significant lake-derived salt aerosol was obtained. Coincidence scintillation spectrometry was used to detect and assign sources to the particles. The salt was identified as marine in origin from the Na/K ratios for single particles greater than 0.4 μm radius and from the similarity of concentration versus mass plots for aerosol at Lake Eyre to plots of marine aerosol over the ocean and at cloud levels in central Queensland, Australia. Back trajectory analyses for air parcels reacing the sampling site during the experiment confirmed that the sampling site was not down wind of the lake and supported the conclusion that despite the proximity of the lake the salt aerosols detected were in fact marine. Over the sampling period the average mass loading of sea-salt in the air at 2 m above ground was 0.55 μg m −3 . The estimated 400 million tons of NaCl in the lake is readily accounted for by deposition of sea salt within the lake catchment area, over a relatively short time. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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