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History of desert dust deposition recorded in the Elbrus ice coreстатья
- Авторы: Kutuzov S., Legrand M., Preunkert S., Ginot G., Mikhalenko V., Shukurov K., Poliukhov A., Toropov P.
- Журнал: Atmospheric Chemistry and Physics Discussions
- Год издания: 2019
- DOI: 10.5194/acp-2019-411
- Аннотация: Ice cores are one of the most valuable paleo-archives. Records from the ice cores can provide information not only about the amount of dust in the atmosphere but also about dust sources and its changes in the past. A 182 m long ice core has been recovered at the western plateau of Mt. Elbrus (5115 m elevation) in 2009. This record was extended with the shallow ice core drilling in 2013. Here we present analysis of the concentrations of Ca2+, a commonly used proxy of dust, recorded in Elbrus ice core over the period 1774–2013. The calcium record reveals a quasi decadal variability with a general increasing trend. Using multiple regression analysis we found a statistically significant spatial correlation of the Elbrus Ca2+ summer concentrations and precipitation and soil moisture content in Levant region (specifically Syria and Iraq). The Ca2+ record also correlates with drought index in North Africa (r = 0.69 p < 0.001) and Middle East regions (r = 0.71 p < 0.001). There is a prominent increase in dust concentration in the ice core over the past 200 years which confirms that the recent droughts in Fertile Crescent 1998–2012 period were most severe at least for the past two centuries. For the 33 years (1979–2012), the significant correlations were found between the Ca2+ and Pacific circulation indexes (PDO, SOI and Niño 4) which may indicate that due to increase in frequency of extreme El Niño and La Niña events with climate warming the influence of circulation over the Pacific Ocean extended to the Middle East.
- Добавил в систему: Михаленко Владимир Николаевич