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Fewer, But More Intense Hurricanes Late This Century

study the signs

A new model simulation of Atlantic hurricane activity for the last two decades of this century projects fewer hurricanes overall, but a slight increase in intensity for hurricanes that do occur. Hurricanes are also projected to have more intense rainfall, on average, in the future. The findings are reported in a study by scientists at NOAA's Geophysical Fluid Dynamics Laboratory in Princeton, N.J., scheduled to be published online on May 18 in Nature Geoscience.

"This study adds more support to the consensus finding of the Intergovernmental Panel on Climate Change and other reports that it is likely that hurricanes will gradually become more intense as the climate continues to warm," said Tom Knutson, research meteorologist and lead author of the report. "It's a bit of a mixed picture in the Atlantic, because we're projecting fewer hurricanes overall.”

Knutson’s co-authors are Joseph Sirutis, Stephen Garner, Gabriel Vecchi, and Isaac Held.

The scientists performed hurricane simulations using a new regional model that offers both higher resolution and an improved ability to simulate past observed changes in Atlantic hurricane activity. In a preliminary study published last October in the Bulletin of the American Meteorological Society, the new model was shown to successfully reproduce Atlantic hurricane counts year-by-year from 1980 to 2006, including the observed increasing trend.

In the new study, the model was used to test the influence of greenhouse gas warming on Atlantic hurricane activity through the end of the 21st century. Simulations reveal higher levels of wind shear and other changes, which act to reduce the overall number of hurricanes in the model.

Tropical Atlantic sea surface temperatures have increased over the past century and several studies have reported strong correlations between increasing tropical Atlantic sea surface temperatures and measures of hurricane activity since at least 1950. Although it is widely accepted in the climate change research community that increases in greenhouse gases have caused most of the global warming of the last half century, the link between increasing greenhouse gases and hurricane activity has been a topic of wide debate and of little consensus.

This new study suggests that in the Atlantic basin, global warming from increasing greenhouse gases will have little impact, or perhaps cause some decrease, in tropical storm and hurricane numbers.

“We'll need to keep an eye on upcoming model studies to see how robust the projected increase in wind shear over the Atlantic turns out to be,” said Knutson.

Large-scale environmental changes in circulation, such as wind shear, as well as possibly moisture, are likely the dominant factors producing the reduced storm frequency. These results support recent research showing that the primary driver of the recent increase in Atlantic hurricane numbers was the warming of the tropical Atlantic relative to the other tropical basins.

These results are also consistent with a number of previous modeling and theoretical studies that have examined the influence of global warming from increasing greenhouse gases on hurricane intensity. An increase in hurricane intensities globally is assessed as "likely" in the Intergovernmental Panel on Climate Change Fourth Assessment Report issued in 2007.

The National Oceanic and Atmospheric Administration, an agency of the U.S. Commerce Department, is dedicated to enhancing economic security and national safety through the prediction and research of weather and climate-related events and information service delivery for transportation, and by providing environmental stewardship of our nation's coastal and marine resources. Through the emerging Global Earth Observation System of Systems (GEOSS), NOAA is working with its federal partners, more than 70 countries and the European Commission to develop a global monitoring network that is as integrated as the planet it observes, predicts and protects.

http://www.noaanews.noaa.gov/stories2008/20080519_hurricanes.html




Submitted by kb on Mon, 2008-05-19 06:44.

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Re2: Where anonymous can find previous results

Submitted by Fred Bortz on Tue, 2008-05-20 09:19.

By writing "Just as the famous "hockey stick" graph could not hold up to scrutiny," you show a particular bias. There was a huge political uproar because both sides tried to make too much of one study in isolation.

When the data is examined in totality, the key concerns that the "hockey stick" has raised are holding up to scrutiny. What we should do about those concerns is a valid political question, but too many people are using political arguments to obfuscate scientific conclusions.

That's why I said to follow the questions for yourself and to beware of politically biased summaries clothing themselves as scientific skepticism. We're always better off if we learn enough about the science to read the primary source material rather than relying on others to summarize it for us.

However, if you want to see a variety of summaries, including the political solutions advocated by Newt Gingrich, the books I review (and sometimes criticize) are listed at this link.

You'll also find some interesting back-and-forth discussion at some of my older blog entries, including discussions of Kilimanjaro and warming on other planets. The bias of many commenters is in full blaze there, as are my (I hope) more reasoned responses.

Fred Bortz -- Science and technology books for young readers (www.fredbortz.com) and Science book reviews (www.scienceshelf.com)

  • reply

Re: Where anonymous can find previous results

Submitted by Anonymous on Tue, 2008-05-20 07:50.

Many thanks, I'll read up on it.

I'm not looking for an "absolute certainty" I'm looking for statistical significance of accuracy. It's fair to say that these models that we are referring to are either accurate or they are inaccurate.

I'm sure nobody would want to base public policy on inaccurate or skewed data. That is my quest. Just as the famous "hockey stick" graph could not hold up to scrutiny, I would like to examine these claims that computer models are showing. Follow the questions...right Fred ;)

  • reply

Where anonymous can find previous results

Submitted by Fred Bortz on Tue, 2008-05-20 07:27.

Anonymous hints at a political agenda when s/he asks for "proof" (since science can disprove but never prove to an absolute certainty), although the comment also includes a better statement, "Where could I find the results from previous computer models scenarios? I would like to see how accurate they are."

I'll give Anon the benefit of the doubt and assume "proof" was an inadvertent slip.

The evidence lies in volumes of scientific literature, and without knowing your current level of knowledge, it is impossible to suggest what will help you to read through it.

Certainly the references in the books I cited will help (and the references in those references). Chris Mooney's Storm World, for example, discusses the science of predicting hurricane patterns (the subject of this thread) in considerable detail. It's an excellent source to understand the historical tension between modelers and those who look for empirical patterns.

(As a person whose doctoral thesis and post-doc work included developing models for condensed matter physics phenomena, I certainly could appreciate the limitations of models as well as their usefulness. If you want to see the only place where my name has become attached to a long-standing computational technique, Google "Bortz Kalos". That will lead you to work I did in the mid-1970s that is still cited today.)

Mooney's references will lead you to the work of many modelers and empiricists.

If you are dealing with the larger issue of climate modeling and its implications for climate change, the best source is probably the Intergovernmental Panel on Climate Change (IPCC) reports. These are full of citations to primary source literature and include discussions of the value and limitations of the various climate models that the panel has used.

Now this citation is certain to draw out right-wing ideologues who will bash the IPCC as alarmist and question the ability of any organization associated with the United Nations to produce good scientific analysis intended to guide policy-makers. They will conveniently leave out the other organization behind the IPCC, the World Meteorological Organization, and they will trot out the same small group of scientists advocating the minority viewpoint while neglecting the IPCC's recent Nobel Peace Prize.

Why Peace, you may ask? Because the consequences of climate change, if not addressed pro-actively, could lead to economic and social disruptions. (I recommend a book called The Little Ice Age: How Climate Made History, 1350-1800 for insight into the impact that even small changes in climate can have on human affairs.)

As you can see, I take a middle-of-the-road approach here, focusing on what science and modeling can and cannot do. I want our policy-makers to have the best science available for making their decisions, and I think political wisdom can come from people of varying perspectives.

So my recommendation is that you gradually work your way toward the primary source literature. Don't accept the conclusions of any of the authors whose books I have reviewed, and don't blindly follow any summary of the literature. Keep an open mind, giving the scientists who have produced the primary source literature credit for doing the same when they present their results. Of course they are human and favor their own viewpoints, but the process of consensus-building always manages to take that into account as well.

I always tell my young readers to "follow their questions." That's my advice to you as well.

Fred Bortz -- Science and technology books for young readers (www.fredbortz.com) and Science book reviews (www.scienceshelf.com)

  • reply

Thanks Fred, but where can I find previous results....

Submitted by Anonymous on Tue, 2008-05-20 05:13.

That's all well and good Fred, but what I'm looking for is proof. I would like to see, where a climate model predicted five years into the future or however long, and see how accurate that computer model was. Where could I find the results from previous computer models scenarios? I would like to see how accurate they are.

  • reply

Re:Question - Computer model and accuracy

Submitted by Fred Bortz on Mon, 2008-05-19 09:29.

Anonymous, you seem to be confusing weather modeling with climate modeling. I think you might benefit from some good books written for the educated nonspecialist.

If historical perspectives help, you might want to visit my page of book reviews on the subject, which I have been writing for more than 10 years.

Early books, such as The Change in the Weather through more recent ones, like The Weather Makers all do a very good job of describing how climate is changing and what that means for day-to-day weather.

The previously cited Storm World makes specific connections to predictions about changes in hurricane patterns (climate). Predictions about the course of an individual hurricane fall under the heading of weather.

Fred Bortz -- Science and technology books for young readers (www.fredbortz.com) and Science book reviews (www.scienceshelf.com)

  • reply

Question - Computer model and accuracy

Submitted by Anonymous on Mon, 2008-05-19 09:12.

Has there ever been a computer model on climate forecasting beyond several months that has a high degree of accuracy? If so can you point to me where I might find info on it?

  • reply

A useful book about hurricane forecasting in a warming world

Submitted by Fred Bortz on Mon, 2008-05-19 08:46.

This is an interesting area of the connection of science and politics. Instead of the usual nonsense, such as Anonymous' tongue-in-cheek attack on what appears to be reputable science, that swirls around it (pun intended), I have a better place to begin your understanding of this topic.

I reviewed and recommend Storm World: Hurricanes, Politcs, and the Battle Over Global Warming for a nuanced, well-researched, and very readable discussion of the science, the politics, and the importance of developing policies that work in a changing world.

Fred Bortz -- Science and technology books for young readers (www.fredbortz.com) and Science book reviews (www.scienceshelf.com)

  • reply

I propose a "New Study"

Submitted by Anonymous on Mon, 2008-05-19 08:23.

I have just completed a computer "weather model" program that predicts, hurricanes will increase in number and drop off in number, while at the same time, increase in severity and decrease in severity.

It also predicts that the global temperature will increase slightly and decrease slightly for the rest of eternity.

Amazingly, it also predicts that taxes will continue to increase no matter what happens.

I am hoping to get a large government grant and huge infusions of money from the academic world to support my ongoing research. It seems only fair.

  • reply

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