Remember the Ridiculously Resilient Ridge?
...scientists have found that rapidly melting Arctic sea ice now threatens to diminish precipitation over California by as much as 15% within 20 to 30 years.
The current wildfire in Ventura county is a foreshadow. Lawrence Livermore National Laboratory scientists elucidate direct effects that melting Arctic ice will have on California precipitation.
The model the scientists used homed in on the link between the disappearance of sea ice in the Arctic and the buildup of high ridges of atmospheric pressure over the Pacific Ocean. Those ridges push winter storms away from the state, causing drought.
The scientists found that as the sea ice goes away, there is an increase in the formation of ridges.
California drought also affected by Antarctic sea ice - no kidding! From a paper on Arctic sea ice...
“The “low Antarctic ice” simulations show that the proposed mechanism can be triggered by sea-ice changes in either hemisphere. Since Antarctic sea-ice loss involves northward propagation in both teleconnection steps (i.e., Antarctic sea-ice affecting the tropical Pacific, which in turn affects the North Pacific) and no high northern latitude changes, it provides additional support for our conjecture that the sea-ice changes can influence North Pacific geopotential height through tropical convection changes. More generally, any high-latitude perturbation (northern or southern hemispheric warming or cooling) that impacts the position of the tropical Pacific ITCZ, will have an impact on California’s rainfall.”