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- W2077493217 abstract "A two-dimensional (2D) model, which uses a residual circulation and diffusion, and a three-dimensional (3D) model, which uses winds from a stratospheric data assimilation system, have been used to estimate the transport and dispersion of aircraft exhaust (tracer) in the lower stratosphere. Four month calculations using the 2D model with tracer injected continuously between 40°–50° north and south latitudes are compared with similar 3D calculations for the same time period. The seasonal behavior of the tracer fields in the two models is similar. The zonal mean of the 3D tracer distribution resembles the 2D distribution when the 2D calculation uses a residual circulation derived from the assimilated wind fields, but the 3D distribution indicates more rapid vertical mixing. The similarity of the 2D and 3D tracer distributions suggests the similarity of the seasonal mean mass transport in both models. However, there is a significant difference in the placement of stratosphere/troposphere exchange in the two models. In the 2D model, tracer transport to the troposphere takes place mostly at high latitudes. In the 3D model, most tracer transport takes place at middle latitudes, and is clearly associated with synoptic scale events. This may be particularly important to assessment calculations, as the pollutant source is mostly in middle latitudes. The 3D model is also used to consider the buildup of tracer in oceanic flight corridors. North Atlantic (Boston-London), north Pacific (Los Angeles - Tokyo) and tropical (Los Angeles-Sydney) corridors are considered. For northern hemisphere winter, the tracer distributions remain zonally asymmetric. The tracer from Boston-London is largely excluded from the Aleutian anti-cyclone, and the tracer from Los Angeles - Tokyo is largely contained within the anticyclone. The tropical tracer distribution is also asymmetric; the time scale for zonal mixing is long compared to the time for meridional transport processes due to weak zonal winds. Although more of the tracer injected in the tropical corridor is transported to higher altitude than for the other corridors, the transfer of mass from the stratosphere to the troposphere is nearly the same for the three corridors. There are no systematic differences that suggest that one corridor is inherently more or less polluting than another." @default.
- W2077493217 created "2016-06-24" @default.
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- W2077493217 date "1993-05-20" @default.
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- W2077493217 title "Implications of three-dimensional tracer studies for two-dimensional assessments of the impact of supersonic aircraft on stratospheric ozone" @default.
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- W2077493217 doi "https://doi.org/10.1029/93jd00250" @default.
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