CEDAR: Investigating Atmospheric Effects of Energetic Particle Precipitation Using Whole Atmosphere Community Climate Model (WACCM)

该研究项目需要进行建模工作，目的是更好地了解中间层高度高能粒子降水对平流层高度温度和化学成分的作用。由高能电子的沉淀产生的一氧化氮有很长的寿命，可以向下输送到平流层，在那里它可以影响臭氧化学。这一过程在极地冬季尤为有效。平流层-中间层耦合路径的不同组成部分目前还不清楚。研究工作将在美国国家大气研究中心（NCAR）全大气群落气候模式（WACCM）框架下对这种耦合模式进行评估和改进。特别是，将为WACCM开发改进的重力波参数化，以更准确地描述降水引起的一氧化氮和二氧化氮的向下输送。此外，WACCM模拟对重力波参数化变化和一氧化氮输运变率的敏感性将被量化。

The research project entails a modeling effort with the goal of better understanding the role of energetic particle precipitation at mesospheric altitudes on temperature and chemical composition at stratospheric altitudes. The nitric oxide produced by the precipitation of energetic electrons has a long lifetime to be transported downwards into the stratosphere where it can affect ozone chemistry. This process is especially effective during the polar winter. The different components of this stratosphere-mesosphere coupling path are not understood at present. The research work will be directed toward the evaluation and improvement of modeling of this coupling in the framework of National Center for Atmospheric Research (NCAR) Whole Atmosphere Community Climate Model (WACCM). In particular, improved gravity wave parameterizations will be developed for WACCM to more accurately describe the downward transport of nitric oxide and nitrogen dioxide induced by the precipitation. Furthermore, the sensitivity of WACCM simulations to changes in gravity wave parameterization will be quantified as well as nitric oxide transport variability.