GSTDTAP  > 地球科学
DOI10.5194/acp-18-5157-2018
Observations of ozone-poor air in the tropical tropopause layer
Newton, Richard1; Vaughan, Geraint1; Hintsa, Eric2; Filus, Michal T.3; Pan, Laura L.4; Honomichl, Shawn4; Atlas, Elliot5; Andrews, Stephen J.6; Carpenter, Lucy J.6
2018-04-17
发表期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
EISSN1680-7324
出版年2018
卷号18期号:7页码:5157-5171
文章类型Article
语种英语
国家England; USA
英文摘要

Ozonesondes reaching the tropical tropopause layer (TTL) over the west Pacific have occasionally measured layers of very low ozone concentrations - less than 15 ppbv - raising the question of how prevalent such layers are and how they are formed. In this paper, we examine aircraft measurements from the Airborne Tropical Tropopause Experiment (ATTREX), the Coordinated Airborne Studies in the Tropics (CAST) and the Convective Transport of Active Species in the Tropics (CONTRAST) experiment campaigns based in Guam in January-March 2014 for evidence of very low ozone concentrations and their relation to deep convection. The study builds on results from the ozonesonde campaign conducted from Manus Island, Papua New Guinea, as part of CAST, where ozone concentrations as low as 12 ppbv were observed between 100 and 150 hPa downwind of a deep convective complex.


TTL measurements from the Global Hawk unmanned aircraft show a marked contrast between the hemispheres, with mean ozone concentrations in profiles in the Southern Hemisphere between 100 and 150 hPa of between 10.7 and 15.2 ppbv. By contrast, the mean ozone concentrations in profiles in the Northern Hemisphere were always above 15.4 ppbv and normally above 20 ppbv at these altitudes. The CAST and CONTRAST aircraft sampled the atmosphere between the surface and 120 hPa, finding very low ozone concentrations only between the surface and 700 hPa; mixing ratios as low as 7 ppbv were regularly measured in the boundary layer, whereas in the free troposphere above 200 hPa concentrations were generally well in excess of 15 ppbv. These results are consistent with uplift of almost-unmixed boundary-layer air to the TTL in deep convection. An interhemispheric difference was found in the TTL ozone concentrations, with values < 15 ppbv measured extensively in the Southern Hemisphere but seldom in the Northern Hemisphere. This is consistent with a similar contrast in the low-level ozone between the two hemispheres found by previous measurement campaigns. Further evidence of a boundarylayer origin for the uplifted air is provided by the anticorrelation between ozone and halogenated hydrocarbons of marine origin observed by the three aircraft.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000430351300002
WOS关键词DEEP CONVECTION ; PACIFIC-OCEAN ; WEST PACIFIC ; ORGANIC-COMPOUNDS ; SOURCE REGIONS ; TROPOSPHERE ; AIRCRAFT ; DIMETHYLSULFIDE ; EMISSIONS ; TRANSPORT
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/30356
专题地球科学
作者单位1.Univ Manchester, Natl Ctr Atmospher Sci, Manchester, Lancs, England;
2.NOAA, ESRL Global Monitoring Div, Boulder, CO USA;
3.Univ Cambridge, Ctr Atmospher Sci, Dept Chem, Cambridge, England;
4.Natl Ctr Atmospher Res, POB 3000, Boulder, CO 80307 USA;
5.Univ Miami, RSMAS, Dept Atmospher Sci, Miami, FL USA;
6.Univ York, Dept Chem, Wolfson Atmospher Chem Labs, York, N Yorkshire, England
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Newton, Richard,Vaughan, Geraint,Hintsa, Eric,et al. Observations of ozone-poor air in the tropical tropopause layer[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(7):5157-5171.
APA Newton, Richard.,Vaughan, Geraint.,Hintsa, Eric.,Filus, Michal T..,Pan, Laura L..,...&Carpenter, Lucy J..(2018).Observations of ozone-poor air in the tropical tropopause layer.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(7),5157-5171.
MLA Newton, Richard,et al."Observations of ozone-poor air in the tropical tropopause layer".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.7(2018):5157-5171.
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