DOI: 10.1002/jgrd.50541
论文题名: Influence of continental outflow and ocean biogeochemistry on the distribution of fine and ultrafine particles in the marine atmospheric boundary layer over Arabian Sea and Bay of Bengal
作者: Nair V.S. ; Moorthy K.K. ; Babu S.S.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 13 起始页码: 7321
结束页码: 7331
语种: 英语
英文关键词: aerosol number size distribution
; aerosol outflow
; chlorophyll
; ocean biogeochemistry
Scopus关键词: Aerosols
; Atmospheric thermodynamics
; Biogeochemistry
; Chlorophyll
; Oceanography
; Aerosol number size distribution
; Aerosol size distributions
; Chlorophyll concentration
; Fine and ultrafine particles
; Indo-Gangetic Plains
; Marine atmospheric boundary layer
; Modal characteristics
; Ocean biogeochemistry
; Size distribution
; biogeochemistry
; boundary layer
; chlorophyll
; continental shelf
; marine environment
; particulate matter
; satellite data
; SeaWiFS
; size distribution
; spatial distribution
; Arabian Sea
; Bay of Bengal
; Gangetic Plain
; Indian Ocean
英文摘要: Extensive measurements of aerosol number size distributions (in the size range of 10 to 875 nm) carried out over the oceanic regions of the Bay of Bengal and Arabian Sea during two large cruise experiments (one during pre-monsoon and the other during winter) are used to investigate the spatial distribution of aerosol size distributions, in general, and that of fine particles, in particular, within the marine atmospheric boundary layer. The size distributions over the northwestern Bay of Bengal, lying downwind of the continental outflow from the Indo-Gangetic Plain, and over the eastern Bay of Bengal, under the influence of the East Asian outflow, showed a bimodal structure with prominent mode (100-125 nm) in the accumulation regime and weak mode (30-40 nm) in the Aitken regime during both pre-monsoon and winter seasons. While the Aitken mode was found to be relatively quite weak in the Indo-Gangetic Plain outflow during both seasons, it was prominent in the East Asian outflow regions, especially during the winter season. The distributions over the northern Arabian Sea, a region quite prone to advection of dust during pre-monsoon and summer seasons, showed a prominent Aitken mode (~45 nm) followed by a weaker accumulation mode during pre-monsoon season. Analysis of SeaWiFS data revealed a systematic collocation of Aitken mode aerosols and the high chlorophyll concentration in the northern Arabian Sea, implying the role of ocean biogeochemistry in influencing the aerosol size distributions. Such a feature implying biogeochemical influence was not seen over the eastern and northern Bay of Bengal during pre-monsoon and winter seasons. Key Points Aerosol NSDs were measured over the oceans around India during spring and winter Outflow from south and southeast Asia showed distinct modal characteristics Aitken particles over the Arabian Sea are associated with ocean biogeochemistry ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63564
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram, Kerala 695022, India
Recommended Citation:
Nair V.S.,Moorthy K.K.,Babu S.S.. Influence of continental outflow and ocean biogeochemistry on the distribution of fine and ultrafine particles in the marine atmospheric boundary layer over Arabian Sea and Bay of Bengal[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(13)