Back in November I posted about the 2006 hurricane season and how far off the mark the forcasts had been. While there were 5 hurricanes, none made landfall in the United States. Following Hurricane Katrina, there were a plethera of stories in the press floating the notion that global warming is causing an increase in hurricanes.
I just recently watched Al Gore’s film, An Inconvenient Truth. In the film Gore relies heavily on Hurricane Katrina disaster imagery and video footage. And he claims that tropical cyclones, hurricanes, and typhoons are increasing in strength and frequency worldwide due to global warming.
Donald Sensing at Winds of Change writes about recent studies that contradict that notion.
Chris Landsea, science and operations director of the National Hurricane Center in Miami, said the notion that global warming is causing an increase in hurricanes gained widespread attention after the stormy seasons of 2004 and 2005.
But that perception is wrong and the statistics don’t bear it out, Landsea told about 200 students and professors in the auditorium at USC’s geography building.
Further study continues to show that hurricane activity occurs in cycles of 20 to 45 years, he said. Even though the seasons of 2004, when four hurricanes bashed Florida, and 2005, when Katrina devastated New Orleans and neighboring parts of the Gulf Coast, seemed shocking, they were no more intense than some storms in the early part of the 20th century and in the 1930s, Landsea said.
[…]
“An Inconvenient Truth,” the book by former Vice President Al Gore, also persuaded some people that global warming is contributing to hurricane frequency and strength, Landsea said.
But facts that also refute the theory are that tropical storms are weakening and becoming less frequent in all oceans except the Atlantic, he said.
Why was the 2006 season below normal? According to Weatherstreet.com, it was partly because tropical western Atlantic sea surface temperatures were lower than previous years.
Part of the reason for the slow season is that tropical western Atlantic sea surface temperatures (SSTs) are running about normal, if not slightly below normal (see graphic below, which shows SST departures from normal).
In contrast, at the same time last year SSTs in the same region were running well above normal.
The cooler SSTs in the Atlantic are not an isolated anomaly. In a research paper being published next month in Geophysical Research Letters, scientists will show that between 2003 and 2005, globally averaged temperatures in the upper ocean cooled rather dramatically, effectively erasing 20% of the warming that occurred over the previous 48 years.
Global Warming?
The slow hurricane season and the cooling sea surface temperatures might be somewhat surprising to the public. Media reports over the last year have suggested that, since global warming will only get worse, and last year’s hurricane activity was supposedly due to global warming, this season might well be as bad as last season. But it appears that Mother Nature might have other plans.
I presume that research was published in Geophysical Research Letters. NOAA has put this information out regarding the recent cooling of upper ocean temperatures - SHORT-TERM COOLING OF OCEANS SUGGEST ‘SPEED BUMP’ IN WARMING.
The article leads off with - “The average temperature of the water near the top of the Earth’s oceans has cooled significantly since 2003.” However they are quick to point out that this is “probably natural climate variability.” Yet NOAA presents no information supporting the headline conclusion that the cooling trend is short-term and the study only used data covering 1993 to 2005.