 |
| Titel |
Tests of a parameterization for auroral forcing in the CCM EMAC for CMIP6 simulations |
| VerfasserIn |
Stefan Versick, Bernd Funke, Miriam Sinnhuber, Andrea Linden, Thomas von Clarmann |
| Konferenz |
EGU General Assembly 2016
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250133612
|
| Publikation (Nr.) |
 EGU/EGU2016-14242.pdf |
|
|
|
|
|
| Zusammenfassung |
| Energetic Particle Precipitation (EPP) is well known as a source of NOx in the middle
atmosphere. Due to the quite long photochemical lifetime of NOx in the polarnight middle
atmosphere transport effects have to be considered. Therefore NOx produced by EPP in the
lower thermosphere can be transported downwards into the stratosphere where it contributes
to the destruction of polar ozone. This process is also called the EPP indirect effect.
Because of radiation feedbacks and stratosphere-troposphere interaction this effect
can alter tropospheric climate. Here we show results for the recommendation for
the implementation of this effect in chemistry-climate-models (CCM) for CMIP6
simulations.
Most of the used models in CMIP6 do not include the source region of NOx. Therefore the
EPP indirect effect needs to be considered as an NOx upper boundary condition. Here, we use
a parametrization in terms of Ap which is based on MIPAS observations. We show how to
best implement the parameterization in models and how to avoid some general pitfalls. The
effects in the used model EMAC (model top at 1 Pa) are compared to observations, generally
showing a good agreement. |
|
|
|
|
|
|