Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016JD025557 |
Low-CCN concentration air masses over the eastern North Atlantic: Seasonality, meteorology, and drivers | |
Wood, Robert1; Stemmler, Jayson D.1; Remillard, Jasmine2; Jefferson, Anne3 | |
2017-01-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2017 |
卷号 | 122期号:2 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | A 20 month cloud condensation nucleus concentration (N-CCN) data set from Graciosa Island (39 degrees N, 28 degrees W) in the remote North Atlantic is used to characterize air masses with low cloud condensation nuclei (CCN) concentrations. Low-CCN events are defined as 6 h periods with mean N-CCN < 20 cm(-3) (0.1% supersaturation). A total of 47 low-CCN events are identified. Surface, satellite, and reanalysis data are used to explore the meteorological and cloud context for low-CCN air masses. Low-CCN events occur in all seasons, but their frequency was 3 times higher in December-May than during June-November. Composites show that many of the low-CCN events had a common meteorological basis that involves southerly low-level flow and rather low wind speeds at Graciosa. Anomalously low pressure is situated to the west of Graciosa during these events, but back trajectories and lagged SLP composites indicate that low-CCN air masses often originate as cold air outbreaks to the north and west of Graciosa. Low-CCN events were associated with low cloud droplet concentrations (N-d) at Graciosa, but liquid water path (LWP) during low-CCN events was not systematically different from that at other times. Satellite N-d and LWP estimates from MODIS collocated with Lagrangian back trajectories show systematically lower N-d and higher LWP several days prior to arrival at Graciosa, consistent with the hypothesis that observed low-CCN air masses are often formed by coalescence scavenging in thick warm clouds, often in cold air outbreaks. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000396116900037 |
WOS关键词 | CLOUD CONDENSATION NUCLEI ; BOUNDARY-LAYER ; OPEN CELLS ; STRATOCUMULUS CLOUDS ; MARINE STRATOCUMULUS ; CELLULAR STRUCTURES ; SEA-SALT ; AEROSOL ; PACIFIC ; ENTRAINMENT |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/33123 |
专题 | 气候变化 |
作者单位 | 1.Univ Washington, Dept Atmospher Sci, Seattle, WA 98195 USA; 2.SUNY Stony Brook, Sch Marine & Atmospher Sci, New York, NY USA; 3.Cooperat Inst Res Environm Sci, Boulder, CO USA |
推荐引用方式 GB/T 7714 | Wood, Robert,Stemmler, Jayson D.,Remillard, Jasmine,et al. Low-CCN concentration air masses over the eastern North Atlantic: Seasonality, meteorology, and drivers[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2017,122(2). |
APA | Wood, Robert,Stemmler, Jayson D.,Remillard, Jasmine,&Jefferson, Anne.(2017).Low-CCN concentration air masses over the eastern North Atlantic: Seasonality, meteorology, and drivers.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,122(2). |
MLA | Wood, Robert,et al."Low-CCN concentration air masses over the eastern North Atlantic: Seasonality, meteorology, and drivers".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 122.2(2017). |
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