Meteorological mechanisms for transporting O-3 over the western North Atlantic ocean: A case study for August 24-29, 1993

被引:39
作者
Moody, JL
Davenport, JC
Merrill, JT
Oltmans, SJ
Parrish, DD
Holloway, JS
Levy, H
Forbes, GL
Trainer, M
Buhr, M
机构
[1] NOAA, AERON LAB, BOULDER, CO 80303 USA
[2] ATMOSPHER ENVIRONM SERV, DOWNSVIEW, ON M3H 5T4, CANADA
[3] PRINCETON UNIV, NOAA, GEOPHYS FLUID DYNAM LAB, PRINCETON, NJ 08542 USA
[4] UNIV RHODE ISL, GRAD SCH OCEANOG, CTR ATMOSPHER CHEM STUDIES, NARRAGANSETT, RI 02882 USA
[5] NOAA, CLIMATE MONITORING & DIAGNOST LAB, BOULDER, CO 80303 USA
关键词
D O I
10.1029/96JD00885
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
A large-scale view of O-3 transport over the western North Atlantic Ocean (WNAO) in summer illustrates distinct sources of O-3, and separate transport mechanisms are important at different vertical levels in the troposphere, The week-long period presented covers a sequence of O-3 sondes released from Bermuda and encompasses two surface O-3 events in the month-long NARE intensive. O-3 and CO peaked at Chebogue Point on the evening of August 25 and after midnight. on the morning of August 28. At Sable Island, peaks occurred during early morning of August 26 and late morning of August 28. These events occurred under W-SW winds associated with advancing low-pressure systems that transported anthropogenic pollutants over the WNAO. The concentrations dropped with the passage of a trough or a cold front. Evidence suggests the surface was occasionally isolated from polluted air during favorable transport with pollutants lifted in warm sector flow riding over a wedge of cool, thermodynamically stable air, In addition to surface O-3, the O-3-sonde profile over Bermuda on the morning of August 27 showed a deep layer of O-3 from 6 to 12 km. Using back trajectories and two tracers (isentropic potential vorticity and water vapor), we illustrate that stratospheric ozone exchanged into the upper troposphere in conjunction with surface cyclogenesis was advected through the middle to upper troposphere over the midlatitudes with the potential to reach lower altitudes through subsidence in regions of anticyclonic motion.
引用
收藏
页码:29213 / 29227
页数:15
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