In today's edition of Tech Central Station, Dr. Roy Spencer, Principal Research Scientist at the University of Alabama and one of the world's top climatologists, considers the arguments that global warming is causing more frequent and intense tropical storms:
There is some recent research that suggests that of all Atlantic and West Pacific tropical cyclones measured since the 1970's, a warming trend in sea surface temperatures has been accompanied by stronger and longer-lived storms. In fact, the increase in the total power generated by the storms that the study computed was actually much larger than could be accounted for by theory, suggesting changes in wind shear or other processes are operating in addition to just increased temperatures. (Unpublished results by the same researcher suggests, however, that this trend was not apparent in land falling hurricanes since the 1970's).
Given the recent work, how should we view the role of global warming? First, we know that category 4, and even category 5, storms have always occurred, and will continue to occur, with or without the help of humans, as the above examples demonstrate. Therefore, if we are prepared for what nature can throw at us, we will be prepared for the possible small increase in hurricane activity that some studies have suggested could occur with man-made global warming. To suggest that Katrina was caused by mankind is not only grossly misleading, it also obscures the real issues that need to be addressed, even in the absence of global warming. From a practical point of view, there is little that we can do in the near term to avert much if any future warming anyway, no matter what you believe that warming will be, including participating in the Kyoto Protocol. So why even bring it up (other than through political, philosophical, or financial motivation)?