The Quasi-Decadal Oscillation: An Observational and Theoretical Study

PIS将确定臭氧中观测到的准十年振荡(QDO)是否是平流层环流中观测到的QDO导致臭氧动力输送的年际变化的结果。这将有助于开发一个自洽的QDO理论模型。利用一系列更新的数据记录，他们将首先确定平流层臭氧、温度、位势高度和纬向风中的QDO。他们将应用观测得到的垂直/经向温度梯度和位势高度的回归系数来建立准两年振荡(QBO)和QDO的每一阶段的纬向风和温度梯度异常。然后，他们将修正NCAR二维化学输送模式，以计算QBO和QDO各月和各位相的纬向平均环流和温度梯度场规范。由此产生的平均经向环流和臭氧分布将作为月份、纬度和气压水平的函数来计算。最后，计算的臭氧分布之间的差异将产生一个有效的模式--预测的臭氧QDO的结构，用于与观测到的臭氧QDO进行比较。

The PIs will determine whether the observed quasi-decadal oscillation (QDO) in ozone is a result of interannual changes in dynamical transport of ozone resulting from the observed QDO in stratospheric circulation. This would help develop a self-consistent theoretical model of the QDO. Using a series of updated data records, they will first determine the QDO in stratospheric ozone, temperature, geopotential height, and zonal wind. They will apply observationally derived regression coefficients for vertical/meridional temperature gradients and geopotential heights to construct zonal wind and temperature gradient anomalies for each phase of the quasi-biennial oscillation (QBO) and QDO. Then, they will modify the NCAR two-dimensional chemical transport model for zonal mean circulation and temperature gradient field specification for each month and phase of the QBO and QDO. Resulting mean meridional circulation and ozone distributions will be calculated as a function of month, latitude and pressure level. Finally, the differences between calculated ozone distributions will produce an effective model-predicted ozone QDO's construction for comparison to observed ozone QDO.