|  |
Program |
 |
| |
 |
Special Session 5: Ocean-atmosphere interaction, multi-scale climate variability and their implication for biogeochemical processes |
| |
|
|
The coordinated effect of Arctic sea ice reduction and ENSO on Eurasian winter climate
Wednesday 11th @ 1030-1050
Room 1
Shuanglin Li* , Institute of Atmospheric Physics
Zhe Han, Institute of Atmospheric Physics
Presenter Email: shuanglin.li@mail.iap.ac.cn
|
| Both Arctic sea ice loss and ENSO events affect winter climate in midlatitude Eurasia. Since the two forcings sometimes occur simultaneously, determining whether they are independent of each other is undertaken first. The result suggests an overall independence. Considering possible interactions between them, their coordinated impacts on the Eurasian winter climate are then investigated based on observational data analyses, historical simulation analyses from coupled models contributing to CMIP5, and atmospheric general circulation model sensitive experiments in ECHAM5. The results show that the impacts of the two forcings are overall linearly accumulated. Despite the additive linearity, weak additive nonlinearity between the two forcings is identifiable. The mechanism for the additive nonlinearity is then explored. Further the asymmetry of the effects of El Nino and La Nina under the Arctic sea ice loss background is discussed. |
|
|
|
|