Texas and neighboring states are experiencing a major cold wave causing substantial snowfall and power outages affecting millions of people.
A number of major media outlets are making the claim that such cold is a “sign” or “indication” of global warming (see sample below)
Disturbingly, a few prominent public scientists are parroting these claims, suggesting that the cold waves are examples of “global weirding” caused by greenhouse warming.
Such claims are demonstrably untrue and can be easily proven to be untrue.
The facts are clear:
- Global warming has been occurring and has preferentially warmed the Arctic, the source of cold air for North America.
- The number of cold waves and cold temperature records have declined as the Earth has warmed.
- Cold waves are the expressions of the natural variability of the atmosphere.
If global warming caused more cold waves, then we should be seeing more of them, since global warming is occurring. We are not seeing more or stronger cold waves.
Consider this graph from U.S. EPA website showing the trend in cold waves from 1910 to now over the lower 48 states. There are LESS cold waves.
Or a map of the changes in cold waves from 1948 to 2015. Red downward arrows (reduced cold waves) are dominant across the U.S., particularly in the western U.S.
Let’s turn to Texas. Here is a plot of minimum temperature for February for the entire state from a NOAA Climate website for the past 130 years. The monthly minima are getting higher as the planet warms. Less cold waves.
And finally what about records at individual stations? Here is a plot of the lowest temperature each year at Dallas/Fort Worth over the past 50 years. The lowest temperatures are rising as global warming occurs.
Rising minimum temperatures and DECREASED cold waves are the expected sign of global warming. This is particularly true of the central and eastern U.S.
Why? Because the source of the cold air in U.S. cold waves is the Arctic and the Arctic is warming more quickly as greenhouse gases warm the planet. To show you this, here is plot of surface temperature change over the past 50 years. The Arctic is warming more quickly than any other place, something duplicated by models and expected by physical reasoning (for example, that is where sea ice is melting most rapidly).
The cold air that plummets into the central North America comes from the Canadian Arctic, something you can see in the maps below that show temperatures at around 5000 ft. on Feb.11 and Feb. 15. The blue and purple areas are regions that are much colder than normal.
What is most disturbing to me is that so many media outlets are headlining a claim that is so obviously wrong. How can society make rational decisions when the public is being misinformed about such important matters?
firstname.lastname@example.org (Cliff Mass Weather Blog)
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