Researchers emphasize evaluation of tradeoffs in battling urban heat island

Sep 07, 2012

A team of researchers from Arizona State University have found that warming resulting from megapolitan expansion is seasonally dependent, with greatest warming occurring during summer and least during winter. Among the most practical ways to combat urbanization-induced warming – the painting of building's roofs white – was found to disrupt regional hydroclimate, highlighting the need for evaluation of tradeoffs associated with combating urban heat islands (UHI).

"We found that raising the reflectivity of buildings by painting their roofs white is an effective way of reducing higher caused by urban expansion," said Matei Georgescu, an assistant professor in ASU's School of Geographical Sciences and Urban Planning. "However, increased also modifies hydroclimatic processes and, in the case of the 'Sun Corridor,' can lead to a significant reduction of rainfall. Our maximum Sun Corridor expansion scenario leads to a 12% reduction in rainfall, averaged across the entire state. Painting roofs white leads to an additional 4% reduction in rainfall."

The research is presented in the paper, "Seasonal hydroclimatic impacts of Sun Corridor expansion," published in the Sept. 7, 2012 issue of Environmental Research Letters. Georgescu, the lead author of the paper, is joined by Alex Mahalov, The Wilhoit Foundation Dean's Distinguished Professor in the School of Mathematical and at ASU, and Mohamed Moustaoui, an associate professor in ASU's School of Mathematical and Statistical Sciences.

The paper focuses on Arizona's Sun Corridor, the most rapidly growing megapolitan area in the United States. Located in a semi-arid environment, the Sun Corridor is composed of four metropolitan areas: Phoenix, Tucson, Prescott and Nogales. With a population projection expected to exceed 9 million people by 2040, the rapidly expanding megapolitan offers the opportunity to identify tradeoffs focused on sustainable expansion of the built environment.

The authors utilized 2050 projections of Sun Corridor growth developed by the Maricopa Association of Governments (MAG), the regional agency for metropolitan Phoenix that provides long-range and sustainably oriented planning. They conducted continuous multi-year, multi-member, continental scale numerical experiments for several 2050 Sun Corridor growth and adaptation scenarios and compared results with a modern day Sun Corridor representation.

"For a maximum expansion scenario, we find greatest warming to occur during summer, in excess of 1 degree C (1.8 degrees F) when averaged over the entire state of Arizona. Warming remains considerable during both spring and fall seasons, approaching 0.9 C. For a minimum expansion scenario, the consistent theme of maximum warming during summer with reduced, although still significant, warming during spring and fall seasons persists," Georgescu added.

Whereas previous research has documented the contribution of cool roofs as an effective UHI mitigation approach, this work emphasizes the need to broadly evaluate impacts by exploring consequences that extend to hydrology and rainfall.

"Truly sustainable development will have to consider impacts extending beyond average temperature," Georgescu explained. "A crucial step in that approach is to identify potential adaptation and mitigation strategies and assess tradeoffs, to ensure that we make smart decisions with minimum damaging consequences."

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User comments : 19

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NotParker
2.3 / 5 (9) Sep 07, 2012
It is nice to see that some scientists acknowledge that UHI exists, unlike say the BEST team (and VD) which disputes its existence.
VendicarD
2.3 / 5 (6) Sep 07, 2012
ParkerTard seems to be very frustrated that his continual stream of lies are being continually exposed.

His latest lie is claiming that I and the BEST researchers dispute the existence of Urban Heat Islands. In fact we do nothing of the kind.

Best repeats a finding - which I repeat, that the UHI effect doesn't significantly alter the measured global temperature trend.

In fact, Temperature trends using rural stations alone, unaffected by heat island warming, actually show a stronger warming than those that are thought to be experiencing anomolous UHI warming.

ParkerTard doesn't seem capable of accepting the fact that the Oceans are also warming and do not suffer from heat island effects.

So too are the polar regions, and they also do not suffer from any heat island bias.

Meanwhile Arctic Sea Ice reached a new low today of 2.35 million square kilometers.

It is possible that over the next few days there will be slightly more melting, and a new low will be reached.

VendicarD
2.3 / 5 (6) Sep 07, 2012
Meanwhile, in a fit of mouth frothing madness, Parker Tard claimed over 1.5 weeks ago that the Arctic Ice had started to freeze and lce levels were in fact increasing.

Laughably, ParkerTard's proclamations have turned out to be a lie.
NotParker
2.3 / 5 (9) Sep 07, 2012
ParkerTard seems to be very frustrated that his continual stream of lies are being continually exposed.

His latest lie is claiming that I and the BEST researchers dispute the existence of Urban Heat Islands.


Poor filthy-mouthed AGW cult member ... his dementia has resulted in him forgetting he has said that at least 100 times.

thermodynamics
3 / 5 (6) Sep 08, 2012
NP: How about that claim you made that the Arctic started freezing a week ago? How about the claim that this is not a year of record low ice in the Arctic? How do you expect anyone to take your claim about heat islands seriously? The researchers take the heat islands into account (as you know). You say: "It is nice to see that some scientists acknowledge that UHI exists, unlike say the BEST team (and VD) which disputes its existence." Nothing could be farther form the truth. The BEST team says: "Berkeley Earth also has carefully studied issues raised by skeptics, such as possible biases from urban heating, data selection, poor station quality, and data adjustment. We have demonstrated that these do not unduly bias the results" They can be found at:

https://www.googl...berkeley earth surface temperature&oq=berkeley earth &gs_l=hp.1.0.0l10.2300.9291.0.11078.19.16.2.1.1.0.347.1766.10j5j0j1.16.0.les%3B..0.0...1c.1.lDaaMadavWw
thermodynamics
3.4 / 5 (5) Sep 08, 2012
Sorry about the broken link to BEST, but you can just go there and go about half way down on their "Main Findings" section. It is amazing they started as skeptics with Koch funding.

http://berkeleyea...summary/

See if the link comes through this time.
VendicarD
3 / 5 (6) Sep 08, 2012
Yes, ParkerTard is growing ever more frustrated that his lies are constantly being exposed.

"Poor filthy-mouthed AGW cult member ... " - ParkerTard

Sadly, ParkerTard can not provide a single example of where I have ever said such a thing.

I challenge him to find any example from any forum, at any time in the history of the "real" universe - Not the circus like fantasy land he lives in.

"his dementia has resulted in him forgetting he has said that at least 100 times." - ParkerTard

He is mentally diseased.
thermodynamics
3 / 5 (4) Sep 08, 2012
NotParker: Just to keep your feet to the fire, where is that fast freeze you predicted in the arctic a week ago?

http://nsidc.org/...icenews/

As everyone knows, it is near the end of the melting season, but it is still going down for a day or two more. It is also much lower than 2007 - which you still seem to deny. What is your motivation for these embarassing statements and then trying to misquote this article?
VendicarD
2.6 / 5 (5) Sep 08, 2012
Yesterday saw a new record low Arctic ice area of 2.35 million square kilometers. Down almost 60% over recent historical averages, and the lowest ice area ever recorded in human history.

Yet in ParkerTard land, sea ice has been growing for the last 1.5 weeks even though his own source of information states otherwise.

It is sad that people like ParkerTard go through their lives with untreated mental disease.

Psychiatrists should have turned last weeks Republican Presidential hoedown into the worlds largest psychiatric hospital for the criminally insane.
NotParker
2.5 / 5 (8) Sep 08, 2012
UHI in Rome using satellites.

"Satellite derived maps confirmed, during summer months, an average intensity of CLHI of about 3–4 K during nighttime"

http://www.mdpi.c...1400/pdf

And since the average temperature is Tmin + Tmax, the average temperature in Rome is actually at least 2C cooler that thermometers would show.

If you put a lot of thermometers in or near cities and airports, it will create an artificial sense that it is a lot hotter than it actually is.

As for BEST, they found no UHI. Satellites find UHI without a problem.

geokstr
2.5 / 5 (8) Sep 08, 2012
Meanwhile, in a fit of mouth frothing madness, Parker Tard claimed over 1.5 weeks ago that the Arctic Ice had started to freeze and lce levels were in fact increasing.

Laughably, ParkerTard's proclamations have turned out to be a lie.


What happened to your old nick, Vendicar? The moderators finally took some action against it, and you've just come up with a new one? I, and others here, will just keep up the reports and emails about your foul-mouthed lack of civility on the new name. Perhaps the moderators will have enough sense to ban your ISP the next time. Then you might have to buy a new computer in order to keep infecting the comment section of this blog.
ubavontuba
2.7 / 5 (7) Sep 08, 2012
What happened to your old nick, Vendicar? The moderators finally took some action against it, and you've just come up with a new one? I, and others here, will just keep up the reports and emails about your foul-mouthed lack of civility on the new name. Perhaps the moderators will have enough sense to ban your ISP the next time. Then you might have to buy a new computer in order to keep infecting the comment section of this blog.

Of course the thought police will downrank me for this... but this is the best news I've read on phys.org in a long time!

VendicarD
2.6 / 5 (5) Sep 09, 2012
ParkerTard is incapable of learning of course.

Yesterday he was provided with this link to a scientific paper
written by the BEST team.

http://berkeleyea...e-26.pdf

The title of the paper is..

Influence of Urban Heating on the Global Temperature Land Average
2 Using Rural Sites Identified from MODIS Classifications

They conclude...

"We observe the opposite of an urban heating effect over the period 1950 to 2010, with a slope of -0.10 +- 0.24 °C/100yr (2σ error) in the Berkeley Earth global land temperature average. The confidence interval is consistent with a zero urban heating effect." - BEST

"If you put a lot of thermometers in or near cities and airports, it will create an artificial sense that it is a lot hotter than it actually is." - ParkerTard

Poor ParkerTard.

He just don't wanna inform his own ignorant ass.

Lines 340 to 346 document how various other groups remove the UHI effect.
VendicarD
2 / 5 (4) Sep 09, 2012
Nothing of the kind. There is essentially no moderation in this forum.

"The moderators finally took some action against it, and you've just come up with a new one?" - GeoksTard

But nothing is preventing you from pretending, if it makes you feel all warm and fuzzy.
VendicarD
2.6 / 5 (5) Sep 09, 2012
UbVonTard elevates wild speculation to "news", almost as if he is watching the infotainment idiocy that is presented on the Faux News propaganda channel.

"but this is the best news I've read on phys.org in a long time!" - UbVonTard
ubavontuba
2.7 / 5 (7) Sep 09, 2012
UbVonTard elevates wild speculation to "news", almost as if he is watching the infotainment idiocy that is presented on the Faux News propaganda channel.
Really? So let's see you respond with your old account then. Can you?
VendicarD
1 / 5 (3) Sep 10, 2012
Why would I keep an old account? Unlike propagandists like yourself and ParkerTard, I have need for only one.

"So let's see you respond with your old account then." - UbVonTard
VendicarD
1 / 5 (3) Sep 10, 2012
Please don't hate me because I am intellectually superior to you.

"I, and others here, will just keep up the reports and emails about your foul-mouthed lack of civility on the new name." - GeoksTard

Jealousy will get you nowhere.

DaveMart
5 / 5 (1) Sep 10, 2012
Green roofs would appear to solve all the issues mentioned, and would improve insulation in winter as well as decrease heat in summer.
They provide additional benefits in reducing storm run off and helping wildlife if they don't use pesticides.

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