News & Press
Atlantic Hurricane Frequency Doubles
July 29, 2007
FREQUENCY OF ATLANTIC HURRICANES DOUBLED OVER LAST CENTURY; CLIMATE CHANGE SUSPECTED
About twice as
many Atlantic hurricanes form
each year on average than a century ago, according to a new statistical
analysis of hurricanes and tropical storms in the north
the study, by Greg Holland of the National Center for Atmospheric Research (NCAR) and Peter Webster of Georgia Institute of Technology, will be published online July 30 in Philosophical Transactions of the Royal Society of London.
"These numbers are
a strong indication
that climate change is a major factor in the increasing number of
The analysis identifies three periods since 1900, separated by sharp transitions, during which the average number of hurricanes and tropical storms increased dramatically and then remained elevated and relatively steady. The first period, between 1900 and 1930, saw an average of six Atlantic tropical cyclones (or major storms), of which four were hurricanes and two were tropical storms. From 1930 to 1940, the annual average increased to 10, consisting of five hurricanes and five tropical storms. In the final study period, from 1995 to 2005, the average reached 15, of which eight were hurricanes and seven were tropical storms.
This latter period
has not yet stabilized,
which means that the average hurricane season may be more active in the
The increases over the last century correlate closely with SSTs, which have risen by about 1.3 degrees Fahrenheit in the last 100 years. The changes in SSTs took place in the years prior to the sharp increases in storm frequency, with an SST rise of approximately 0.7 degrees Fahrenheit leading up to 1930 and a similar rise leading up to 1995 and continuing even after. The authors note that other studies indicate that most of the rise in Atlantic SSTs can be attributed to global warming.
Natural cycles and global warming
The unusually active hurricane seasons of 2004 and 2005 have spurred considerable research into the question of whether more intense tropical cyclones are correlated with natural cycles, global warming, or some other cause. The new study indicates that natural cycles are probably not the entire cause because the increase has happened across the last century rather than oscillating in tandem with a natural cycle.
The study also
finds that enhanced
observations in recent decades cannot account for all of the increase.
observe storms in the
"We are of the strong and considered opinion that data errors alone cannot explain the sharp, high-amplitude transitions between the climatic regimes, each with an increase of around 50 percent in cyclone and hurricane numbers, and their close relationship with SSTs," the authors state.
While the number of storms has steadily increased, the proportion of hurricanes to all Atlantic tropical cyclones has remained steady. Hurricanes have generally accounted for roughly 55 percent of all tropical cyclones. However, the proportion of major hurricanes (those with maximum sustained winds of at least 110 miles per hour) to less intense hurricanes and tropical storms has oscillated irregularly, and has increased significantly in recent years.
Last year's storms
The 2006 hurricane
season was far less active
than the two preceding years, in part because of the emergence of an El
event in the
"Even a quiet year
by today's standards
would be considered normal or slightly active compared to an average
the early part of the 20th century,"
The University Corporation for Atmospheric Research
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