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- W2000490426 abstract "Simulated N 2 O distributions at midlatitudes and high latitudes in the Northern Hemisphere are analyzed in early and late vortex breakup years with the probability distribution function (PDF) technique. The data are from a Center for Climate System Research/National Institute for Environmental Studies (CCSR/NIES) nudging chemical transport model (CTM) for 24 years from 1979 to 2002. Results show that there is a large difference in midlatitude and high‐latitude N 2 O concentrations on the 600 K isentrope between early and late vortex breakup years. In the early breakup years, the N 2 O concentration with the maximum area shows low values in the lower stratosphere in the springtime after the vortex breakup. In the late breakup years, the maximum area concentration shows constant high values from the winter to the summer. Our analyses show that the winter and springtime meridional circulation is a main factor for these differences in N 2 O concentration. In the early breakup years, a larger eddy heat flux causes a stronger winter meridional circulation and a stronger downward advection of low‐N 2 O concentration air at higher altitudes to the lower stratosphere, which leads to the low values of N 2 O concentration in the lower stratosphere in late winter and early spring. Inside the Arctic vortex, however, the importance of vertical advection is smaller than or comparable to other processes such as horizontal divergence and subgrid‐scale motions. These results are consistent with the previous studies on tracer distribution, which showed that not only the vertical advection but also the horizontal eddy transport are important for tracer concentration tendency in the polar vortex." @default.
- W2000490426 created "2016-06-24" @default.
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- W2000490426 date "2007-09-20" @default.
- W2000490426 modified "2023-10-13" @default.
- W2000490426 title "Midlatitude and high-latitude N<sub>2</sub>O distributions in the Northern Hemisphere in early and late Arctic polar vortex breakup years" @default.
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- W2000490426 doi "https://doi.org/10.1029/2007jd008491" @default.
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