Arctic climate change and its governing feedbacks
By drs. E. van der Linden |
The Arctic is warming faster than the Earth as a whole over the past decennia. In addition, observations show a gradual decline in Arctic sea ice extent over the same period. Is it due to melting of sea ice and the so-called albedo feedback that the Arctic is warming faster? Why is sea ice retreating? These are questions that this presentation will touch upon. In addition climate sensitivity and feedback processes in the Arctic climate system will be discussed.
Global climate model experiments reveal that when Earth's climate is perturbed by an increase of greenhouse gases, the climate system reacts by warming. The surface air temperature response to this perturbation is largest in the Arctic region, an effect termed Arctic amplification. The difference between high and low latitude warming is caused by interactions with other climate variables, which act together to intensify temperature change in polar regions. When the temperature change is larger, the climate sensitivity is larger.
This presentation will give an overview of the climate interactions that play a role in high-latitude temperature amplification. It will cover the climate effects of albedo changes due to decreasing sea ice and snow cover, increase in heat flux from the ocean to the atmosphere, stable stratification conditions, cloud cover changes, humidity changes and changes of the atmospheric and oceanic energy transport.
|Willem Barentsz Poolinstituut|
Bundeling van kennis, onderzoek en onderwijs over de Noord- en de Zuidpool
Volg ons op