第一届未来大气科学论坛

Extreme weather events have attracted increasing attention, due to their damaging impacts on natural systems and human communities. “Weather whiplash” describes abrupt transitions from one persistent weather regime to another substantially different one, which is even more disruptive. When we turn our attention to the Arctic sea ice, we observe that the marginal sea ice also undergoes such abrupt declines, which we term as “sea ice whiplash”. In this work, we focus on abrupt sea ice decline events occurring on the synoptic time scale over Barents-Kara Seas (BKS), which is identified based on a daily sea ice tendency index. A composite analysis of these abrupt sea ice decline events reveals that there is a significantly positive bottom-amplified temperature anomaly preceding the abrupt sea ice loss. This anomaly is closely associated with a wave train composed of a Ural blocking and an upstream positive phase of the North Atlantic Oscillation. Such a structure is favorable for the transport of warm and moist air into the BKS. As a result, the tropospheric temperature, including the surface air temperature, increases through horizontal warm-temperature advection, specifically through warm advection of the climatological temperature by the anomalous wind. Furthermore, we examine how the abrupt sea ice decline events and their associated atmospheric conditions change in the context of global warming. This research sheds further light on the complex processes of Arctic weather and climate change.
 

Arctic sea ice decline,Ural,temperature advection