Arid
DOI10.1002/qj.978
Synoptic conditions favouring the occurrence of aerosol episodes over the broader Mediterranean basin
Gkikas, A.; Houssos, E. E.; Hatzianastassiou, N.; Papadimas, C. D.; Bartzokas, A.
通讯作者Hatzianastassiou, N.
来源期刊QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY
ISSN0035-9009
EISSN1477-870X
出版年2012
卷号138期号:665页码:932-949
英文摘要

In the present study, the synoptic conditions that favour the occurrence of aerosol episodes over the broader Mediterranean basin are investigated. For this purpose daily satellite measurements of aerosol optical depth (AOD) at 550 nm from MODIS-Terra (Collection 5) for the period from 1 March 2000 to 28 February 2007 were used together with mean-sea-level pressure and geopotential height at 700 hPa obtained from the NCEP/NCAR Reanalysis Project. An objective and dynamic algorithm was developed in order to determine strong and extreme aerosol episodes in the study area. According to the applied methodology and the relevant criteria, 322 days with aerosol episodes have been identified. The atmospheric circulation of each day was objectively classified by the implementation of Factor Analysis and Cluster Analysis, resulting in eight representative synoptic conditions (clusters). The aerosol episode days (AEDs) are most frequently observed during the dry period of the year, and especially in JulyAugust (108 days or 33.5%) and AprilMay (106 days or 33%) and give rise to desert dust, anthropogenic pollution and biomass-burning episodes. The most frequent synoptic conditions are those of Clusters 4 (30.1%) and 5 (21%), inducing episodes that occur primarily in the western and secondarily in the central Mediterranean. In the former case, which is observed in summer, Europe is under the influence of the extended subtropical anticyclone of the Atlantic (Azores), while the eastern Mediterranean is under the influence of the extended thermal low of south-west Asia. In the latter case, in spring and summer, anticyclonic conditions prevail over central Europe and over the east Atlantic Ocean, and low pressures at the northwestern parts of the broader Mediterranean basin and across the Sahara. During the aerosol episode days of the various clusters, the mean regional AOD can reach values up to 0.8 +/- 0.2 and 2.3 +/- 1.3 for strong and extreme episodes, respectively. Copyright (c) 2011 Royal Meteorological Society


英文关键词aerosol particles dust aerosol transport Mediterranean synoptic conditions
类型Article
语种英语
国家Greece
收录类别SCI-E
WOS记录号WOS:000305073200007
WOS关键词LONG-RANGE TRANSPORT ; SUN-PHOTOMETER MEASUREMENTS ; AIR-POLLUTION EPISODES ; OPTICAL-PROPERTIES ; RAMAN LIDAR ; CHEMICAL-COMPOSITION ; NORTH-ATLANTIC ; MINERAL DUST ; MODIS ; EVENTS
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/174655
作者单位Univ Ioannina, Dept Phys, Lab Meteorol, GR-45110 Ioannina, Greece
推荐引用方式
GB/T 7714
Gkikas, A.,Houssos, E. E.,Hatzianastassiou, N.,et al. Synoptic conditions favouring the occurrence of aerosol episodes over the broader Mediterranean basin[J],2012,138(665):932-949.
APA Gkikas, A.,Houssos, E. E.,Hatzianastassiou, N.,Papadimas, C. D.,&Bartzokas, A..(2012).Synoptic conditions favouring the occurrence of aerosol episodes over the broader Mediterranean basin.QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY,138(665),932-949.
MLA Gkikas, A.,et al."Synoptic conditions favouring the occurrence of aerosol episodes over the broader Mediterranean basin".QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY 138.665(2012):932-949.
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