The Quasi-Decadal Oscillation: An Observational and Theoretical Study

准十年振荡：观测和理论研究

• 批准号: 9712708
• 负责人: Lon Hood
• 金额: $ 21.11万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-11-01 至 2000-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9712708&HistoricalAwards=false
• 关键词: Quasi; Decadal; Oscillation; Observational; Theoretical

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.

这些指数将确定观测到的臭氧准年代际振荡（QDO）是否是平流层环流中观测到的准年代际振荡引起的臭氧动力输送年际变化的结果。这将有助于建立一个自洽的QDO理论模型。利用一系列最新的数据记录，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构建准两年一次振荡（QBO）和QDO的每个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，以获得QBO和QDO每个月和每个阶段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，计算臭氧分布之间的差异将产生有效的模式预测臭氧QDO的构建，以便与观测到的臭氧QDO进行比较。