Former Energy Department Undersecretary Steven Koonin caused quite a stir yesterday in an interview with Mary Kissel of The Wall Street Journal when he stated Federal scientists purposefully misled the public about climate change. He recounted that the 2014 National Assessment of Climate Change Impacts in the United States emphasized a dramatic increase in Atlantic hurricane power beginning in 1980. However, this conveniently chosen segment of the historical record does not tell the entire story—the narrative that hurricanes are right now getting more frequent and intense due to climate change just does not stand up to scrutiny.
The offending figure is on Page 42 of the document (reproduced here). It is in Chapter 2 of the report, which is called “Our Changing Climate.”
These are graphs of something called the Power Dissipation Index (PDI) for Atlantic and Eastern North Pacific hurricanes. Note that the data begins in 1970 and ends in 2009. The text explains the beginning date by saying “there is considerable uncertainty in the record prior to the satellite era (early 1970s).”
This is true, but phenomenally disingenuous. Another hurricane scientist, conspicuously absent from the author list, is Chris Landsea of the National Hurricane Center, who developed the Center’s historical hurricane archive, known as HURDAT2. According to Landsea, the problem in the early record (which should be obvious) is that some storms will be missed, not the other way around! In his words, in a 2013 article in Monthly Weather Review, “Some storms were missed, and many intensities are too low in the pre-aircraft reconnaissance era (before 1944 in the western half of the basin) and in the pre-satellite era (before 1972 for the entire basin).
Therefore, prior to 1972, any history is likely to underestimate the PDI rather than overestimate it.