Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-17-6477-2017 |
Surface ozone in the Southern Hemisphere: 20 years of data from a site with a unique setting in El Tololo, Chile | |
Anet, Julien G.1,2; Steinbacher, Martin1; Gallardo, Laura3,4; Velasquez Alvarez, Patricio A.5,6; Emmenegger, Lukas1; Buchmann, Brigitte1 | |
2017-05-31 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
![]() |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2017 |
卷号 | 17期号:10 |
文章类型 | Article |
语种 | 英语 |
国家 | Switzerland; Chile |
英文摘要 | The knowledge of surface ozone mole fractions and their global distribution is of utmost importance due to the impact of ozone on human health and ecosystems and the central role of ozone in controlling the oxidation capacity of the troposphere. The availability of long-term ozone records is far better in the Northern than in the Southern Hemisphere, and recent analyses of the seven accessible records in the Southern Hemisphere have shown inconclusive trends. Since late 1995, surface ozone is measured in situ at "El Tololo", a high-altitude (2200ma.s.l.) and pristine station in Chile (30 degrees S, 71 degrees W). The dataset has been recently fully quality controlled and reprocessed. This study presents the observed ozone trends and annual cycles and identifies key processes driving these patterns. From 1995 to 2010, an overall positive trend of similar to 0.7 ppbdecade(-1) is found. Strongest trends per season are observed in March and April. Highest mole fractions are observed in late spring (October) and show a strong correlation with ozone transported from the stratosphere down into the troposphere, as simulated with a model. Over the 20 years of observations, the springtime ozone maximum has shifted to earlier times in the year, which, again, is strongly correlated with a temporal shift in the occurrence of the maximum of simulated stratospheric ozone transport at the site. We conclude that background ozone at El Tololo is mainly driven by stratospheric intrusions rather than photochemical production from anthropogenic and biogenic precursors. The major footprint of the sampled air masses is located over the Pacific Ocean. Therefore, due to the negligible influence of local processes, the ozone record also allows studying the influence of El Nino and La Nina episodes on background ozone levels in South America. In agreement with previous studies, we find that, during La Nina conditions, ozone mole fractions reach higher levels than during El Nino conditions. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000402410300001 |
WOS关键词 | STRATOSPHERE-TROPOSPHERE EXCHANGE ; ATMOSPHERIC RESEARCH STATION ; LOW-LEVEL JET ; WEST-COAST ; MACE-HEAD ; GLOBAL SIMULATION ; CUTOFF LOWS ; CHEMISTRY ; CLIMATOLOGY ; TRENDS |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; 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/30500 |
专题 | 地球科学 |
作者单位 | 1.Swiss Fed Labs Mat Sci & Technol Empa, Lab Air Pollut Environm Technol, Dubendorf, Switzerland; 2.WSL Inst Snow & Avalanche Res SLF, Davos, Switzerland; 3.Univ Chile, Dept Geofis, Blanco Encalada 2002,Piso 4, Santiago, Chile; 4.Ctr Climate & Resilience Res CR2, Blanco Encalada 2002, Santiago, Chile; 5.Direcc Meteorol Chile, Estn Cent, Ave Portales 3450, Santiago, Chile; 6.Univ Bern, Inst Phys, Climate & Environm Phys, Bern, Switzerland |
推荐引用方式 GB/T 7714 | Anet, Julien G.,Steinbacher, Martin,Gallardo, Laura,et al. Surface ozone in the Southern Hemisphere: 20 years of data from a site with a unique setting in El Tololo, Chile[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(10). |
APA | Anet, Julien G.,Steinbacher, Martin,Gallardo, Laura,Velasquez Alvarez, Patricio A.,Emmenegger, Lukas,&Buchmann, Brigitte.(2017).Surface ozone in the Southern Hemisphere: 20 years of data from a site with a unique setting in El Tololo, Chile.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(10). |
MLA | Anet, Julien G.,et al."Surface ozone in the Southern Hemisphere: 20 years of data from a site with a unique setting in El Tololo, Chile".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.10(2017). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论