气候变化领域集成服务门户(CCPortal): Summer aerosol measurements over the East Antarctic seasonal ice zone

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DOI	10.5194/acp-21-9497-2021
	Summer aerosol measurements over the East Antarctic seasonal ice zone
	Simmons J.B.; Humphries R.S.; Wilson S.R.; Chambers S.D.; Williams A.G.; Griffiths A.D.; McRobert I.M.; Ward J.P.; Keywood M.D.; Gribben S.
发表日期	2021
ISSN	1680-7316
起始页码	9497
结束页码	9513
卷号	21 期号:12
英文摘要	Aerosol measurements over the Southern Ocean have been identified as critical to an improved understanding of aerosol-radiation and aerosol-cloud interactions, as there currently exists significant discrepancies between model results and measurements in this region. The atmosphere above the Southern Ocean provides crucial insight into an aerosol regime relatively free from anthropogenic influence, yet its remoteness ensures atmospheric measurements are relatively rare. Here we present observations from the Polar Cell Aerosol Nucleation (PCAN) campaign, hosted aboard the RV Investigator during a summer (January-March) 2017 voyage from Hobart, Australia, to the East Antarctic seasonal sea ice zone. A median particle number concentration (condensation nuclei >ĝ€¯3ĝ€¯nm; CN3) of 354 (95ĝ€¯%ĝ€¯CI 345-363)ĝ€¯cm-3 was observed from the voyage. Median cloud condensation nuclei (CCN) concentrations were 167 (95ĝ€¯%ĝ€¯CI 158-176)ĝ€¯cm-3. Measured particle size distributions suggested that aerosol populations had undergone significant cloud processing. To understand the variability in aerosol observations, measurements were classified by meteorological variables. Wind direction and absolute humidity were used to identify different air masses, and aerosol measurements were compared based on these identifications. CN3 concentrations measured during SE wind directions (median 594ĝ€¯cm-3) were higher than those measured during wind directions from the NW (median 265ĝ€¯cm-3). Increased frequency of measurements from these wind directions suggests the influence of large-scale atmospheric transport mechanisms on the local aerosol population in the boundary layer of the East Antarctic seasonal ice zone. Modelled back trajectories imply different air mass histories for each measurement group, supporting this suggestion. CN3 and CCN concentrations were higher during periods where the absolute humidity was less than 4.3ĝ€¯gH2O/m3, indicative of free tropospheric or Antarctic continental air masses, compared to other periods of the voyage. Increased aerosol concentration in air masses originating close to the Antarctic coastline have been observed in numerous other studies. However, the smaller changes observed in the present analyses suggest seasonal differences in atmospheric circulation, including lesser impact of synoptic low-pressure systems in summer. Further measurements in the region are required before a more comprehensive picture of atmospheric circulation in this region can be captured and its influence on local aerosol populations understood. © Copyright:
语种	英语
scopus关键词	aerosol; atmospheric transport; cloud condensation nucleus; concentration (composition); ice; particulate matter; seasonal variation; source apportionment; Antarctica; East Antarctica
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246788
作者单位	Centre for Atmospheric Chemistry, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, NSW 2522, Australia; Climate Science Centre, CSIRO Oceans and Atmosphere, Aspendale, VIC 3195, Australia; Australian Antarctic Program Partnership, University of Tasmania, Hobart, TAS 7000, Australia; ANSTO, Environmental Research, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia; Engineering and Technology Program, CSIRO National Research Collections Australia, Hobart, TAS 7004, Australia
推荐引用方式 GB/T 7714	Simmons J.B.,Humphries R.S.,Wilson S.R.,et al. Summer aerosol measurements over the East Antarctic seasonal ice zone[J],2021,21(12).
APA	Simmons J.B..,Humphries R.S..,Wilson S.R..,Chambers S.D..,Williams A.G..,...&Gribben S..(2021).Summer aerosol measurements over the East Antarctic seasonal ice zone.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(12).
MLA	Simmons J.B.,et al."Summer aerosol measurements over the East Antarctic seasonal ice zone".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.12(2021).