President Obama recently visited Alaska and stirred the urge to check into the global warming controversy. He visited the Exit Glacier and mentioned that it had retreated 1.25 miles in 200 years. I was inspired to check into temperatures in Alaska and found one web site that says it is managed by members of the “American Association of State Climatologists.” They observe that, “The topic of climate change has attracted widespread attention in recent years and is an issue that numerous scientists study on various time and space scales. One thing for sure is that the earth’s climate has and will continue to change as a result of various natural and anthropogenic forcing mechanisms.” (Bravo!)
The site presents a graph showing that temperatures since the late 1970s have trended upward. However, they point out there has been little warming “…with the exception of Barrow (on the coast above the Arctic Circle) and a few other locations. The stepwise shift appearing in 1976 corresponds to a phase shift in the Pacific Decadal Oscillation from a negative phase to a positive phase.” That causes “…increased southerly flow and warm air advection into Alaska during the winter, resulting in positive temperature anomalies.” I don’t understand how increasing levels of carbon dioxide could have caused that, but I’m not a climatologist.
One article I read about President Obama’s visit to Alaska should have been checked more closely for errors before it went to print. It said (and I’m certain this must have been an error) that “The administration asked Congress to speed the acquisition of a new heavy-duty Coast Guard ice breaker from 2022 to 2020 and begin planning for the acquisition of additional ships that could help maintain year-long access to polar regions.” Why am I so convinced this must have been an error? It makes no sense to build ice breakers when the global warming models indicate polar ice will be mostly melted in the next few years.
The National Snow and Ice Data Center web site shows current levels of ice are less than those measured in 2013 and 2014, equal to 2011, and much more than 2012. A quick look at the graphs for the last five years indicates the levels of ice are about constant. Perhaps we should hope the data eventually will begin to track with the predictions from the global warming models and we can save money by not needing ice breakers.
Ponderer was kind enough to comment on the information above and points out that Dr. Strangelove would have wanted us to not have an icebreaker gap with the Russians reminiscent of the fallout shelter gap of that movie (not the exact words, but sorta close). Ponderer also thought it would be fair to show a chart of Arctic sea ice from the 1950s, which dramatically demonstrates that there is much less ice today. Point taken. However, I continue to have the suspicion that nature (including solar activity) has more to do with the extent of sea ice than the influences caused by man.