N2O as a dynamical tracer in the Arctic vortex
N2O as a dynamical tracer in the Arctic vortex
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N2O 作为北极涡旋的动态示踪剂
DOI：
10.1029/gl017i004p00477
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
S. Strahan
中科院分区：
文献类型：
--
作者：
M. Loewenstein;J. Podolske;K. R. Chan;S. Strahan
本文报道了机载可调谐激光吸收光谱仪在1989年北极平流层野外考察期间对NASA ER-2飞机的14次飞行中N2O的测量结果。在预计臭氧损失的海拔范围内，N2O具有很长的光化学寿命，使其成为平流层低层空气运动的极佳示踪剂。与南半球一样，纬向风速最大值和位涡和N2O的大梯度确定了涡旋边缘。涡旋内部的N2O廓线表明，相对于涡旋外部和夏季极地平流层下部，N2O的净下降。北极夜间N2O廓线相对于夏季廓线的下降与1987年南极冬季涡旋观测到的垂直廓线下移相当。在435K位温面以上，两极冬季廓线非常相似，但在435K位温面以下则存在差异。
This paper reports N2O measurements obtained by the Airborne Tunable Laser Absorption Spectrometer from 14 flights of the NASA ER-2 aircraft during the 1989 Airborne Arctic Stratospheric Expedition field campaign. In the altitude range expected for ozone loss, N2O has a long photochemical lifetime, making it an excellent tracer of lower stratospheric air motions. As in the southern hemisphere, the zonal wind speed maximum and large gradients of potential vorticity and N2O identify the vortex edge. The N2O profiles inside the vortex indicate net descent relative to outside the vortex and to the summer polar lower stratosphere. The descent of the N2O profile during the Arctic night relative to the summer profile is comparable to the downward shift in the vertical profile observed in the 1987 Antarctic winter vortex. Winter profiles at the poles are very similar above the 435 K potential temperature surface, but divergent below.