China’s Urban Heat Island Problem

How does urban-induced warming in Beijing interact with air temperature in summer? INSTITUTE OF ATMOSPHERIC PHYSICS, CHINESE ACADEMY OF SCIENCES Beijing has undergone several important urbanization development stages since late 1978. Linked with urbanization, the so-called “urban heat island effect” is a key problem caused by urban land expansion. Such changes in air temperature in…

Study: UHI in Hong Kong accounts for most ‘warming’ since 1970

From the INSTITUTE OF ATMOSPHERIC PHYSICS, CHINESE ACADEMY OF SCIENCES How much warmer has Hong Kong’s urban area become during the past 4 decades? Characterizing the urban temperature trend using seasonal unit root analysis: Hong Kong from 1970 to 2015 Scientists from Macao Polytechnic Institute are pioneers in exploring urban temperature in Hong Kong using…

Study: Haze in China amplifies UHI effect

Study reveals surprising role of haze in the warming of Chinese cities Research reveals that impacts of haze pollution in the US and China vary significantly From the YALE SCHOOL OF FORESTRY & ENVIRONMENTAL STUDIES A new Yale-led study published in the journal Nature Communications sheds light on the surprising role that haze in China…

Future summers could be hotter than any on record

From the NATIONAL SCIENCE FOUNDATION and the “it’s always hotter in the city than the country department comes this collection of spin: In 50 years, summers across most of the globe could be hotter than any summer experienced by people to date, according to a study by scientists at the National Center for Atmospheric Research (NCAR)…

Study: UHI affects the urban growing season

From the UNIVERSITY OF WISCONSIN-MADISON Spring comes sooner to urban heat islands, with potential consequences for wildlife MADISON, Wis. — With spring now fully sprung, a new study by University of Wisconsin-Madison researchers shows that buds burst earlier in dense urban areas than in their suburban and rural surroundings. This may be music to urban…

How not to measure temperature (or climate) #97 – California’s warming air temperatures are population and site bias related

A couple of days ago, I highlighted a worst of the worst NOAA climate monitoring station in Arizona with the help of a scientist from the University of Washington. My friend Jim Goodridge, former California State Climatologist continues to be busy in his retirement, and sends this along today. He’s been tracking a group of…

Study proves urban heat islands exist, even in the Arctic

From the “we told you so years ago” department comes this interesting study that might explain the 8 °C red spot in the Russian Arctic that NASA GISS always seems to have: From Science News: A novel form of the “urban heat island” effect might contribute to why the far north is warming faster than…

♫ I left my UHI, in Sannn Frannncisco ♪

Apologies to singer Tony Bennett for the title. Our own “Charles the moderator” writes in with this curious picture from Weather Underground showing downtown San Francisco at about 2:15PM September 8th, 2015. The disparity of temperature just a few blocks away is quite stunning. In the two temperatures circled in the downtown area yesterday there is…

Cooking In New York

Guest Post by Willis Eschenbach I’ve been thinking about the idea of the urban heat island (UHI) as a result of my post on the bogus temperature “record” at Heathrow. The “urban heat island” refers to the fact that cities generally run warmer than the surrounding countryside. This is from some combination of the direct heat…

Think UHI doesn’t affect the climate? Think again.

From AGU: More urban heat; less summer fog, on California coast Larry O’Hanlon writes on the AGU blog Geospace: The summer fog that shrouds coastal southern California – what locals call the June Gloom – is being driven up into the sky by urban sprawl, according to scientists who have studied 67 years of cloud…

UHI – worse than we thought

Remember when I measured the UHI in Reno, NV? It seems the normally alarmist “Climate Central” is just now getting around to recognizing UHI, but of course, they have to put in the obligatory disclaimer that it cannot possibly contribute to the global warming signal. Well, they are just flat wrong about that, but that’s…

UHI and heat related mortality

From Arizona State University Study links urbanization and future heat-related mortality TEMPE, Ariz. – Phoenix stands at a parched crossroads. Global scale climate change is forecast to bring hotter summers and more extreme heat to the Valley, but regional urbanization also will impact temperatures experienced by residents.

Unwarranted Temperature Adjustments and Al Gore’s Unwarranted Call for Intellectual Tyranny

Guest essay by Jim Steele, Director emeritus Sierra Nevada Field Campus, San Francisco State University For researchers like myself examining the effect of local microclimates on the ecology of local wildlife, the change in the global average is an absolutely useless measure. Although it is wise to think globally, wildlife only responds to local climate…

Analysis Of UHI In South Korea

Guest essay by Paul Homewood Seoul I ran a post earlier about UHI in South Korea. A study by two Korean scientists found that over half of the warming reported in Korea since 1954 was a result of UHI. In many cities, the effect of UHI was to add more than a degree to temperatures…

Is Fighting Global Warming the Solution to Water Shortages in Malawi (or Elsewhere)?

Guest essay by E. Calvin Beisner In late May two evangelical environmentalists, recently returned from visiting Malawi, published articles in which they said poor Malawians are suffering from reduced rainfall caused by manmade global warming. Jonathan Merritt wrote for Religion News Service, “In America, climate change is a matter of debate, but in places like…

The Chinese demonstrate that UHI has a real and essential effect on regional climate change

Study finds that urbanization has considerable influence on the regional climate change, they even blame proximity to air-conditioning as a factor. Press release from Science China Press (full paper follows) Urbanization and surface warming in eastern China A recent study indicated that the urbanization in eastern China has significant impact on the observed surface warming…

Climate Craziness of the week – with the physical signature of UHI staring them right in the face, Mann & Borenstein go with their ‘gut’ instincts

Some people wonder if Michael Mann is simply an activist masquerading as a scientist, this lends credence to that idea. I wonder if Dr. Mann has ever visited weather stations in China to understand what is going on there? I have. I had to laugh when I saw this quote from Mann in Seth Borenstein’s…

California to quantify UHI statewide

From the if we can quantify it we’ll figure out a way to tax it department comes this short press release (h/t Kakatoa) The Governor’s Office of Planning and Research is joining with Cal/EPA and several other State agencies on a new research project about the Urban Heat Island Effect. A major goal of this…

Station bias – an old problem

A number of readers have commented about the story from Sunday about NOAA’s experiment at Oak Ridge Laboratory to determine the warming effects of siting suggesting that the experiment was long overdue. many found it surprising that it has taken NOAA this long to get serious about the issue that Dr. Roger Pielke Sr. and…

Via experiment, NOAA establishes a fact about station siting: ‘nighttime temperatures are indeed higher closer to the laboratory’

WUWT readers may recall that I wrote about this experiment being performed at Oak Ridge national Laboratory to test the issues related to station siting that I have long written about. NOAA’s ‘Janus moment’ – while claiming ‘The American public can be confident in NOAA’s long-standing surface temperature record’, they fund an experiment to investigate…

Earth at night – wildfires in Australia

From NASA – Wildfires Light Up Western Australia (nothing unusual here, it happens every year) A stunning video of the Earth at night follows. Careful observers of the new “Black Marble” images of Earth at night released this week by NASA and the National Oceanic and Atmospheric Administration have noticed bright areas in the western…

The heat is on: the UK SurfaceStations effort

They say “imitation is the sincerest form of flattery”, so color me flattered. I’ve been remiss in writing about this effort by Roger Tattersall (aka Tallbloke) and his colleague Tim Channon, but a tip from WUWT reader David Schofield brought me to think this would be good to mention it, so they can make comparisons. …

Measuring UHI on a bike produces a new paper

While NCDC’s Dr. Thomas Peterson tries to ignore UHI, from Hans Von Storch at Die Klimazwiebel (h/t to Jos de Laat) we learn that many other people are actively measuring it. WUWT reader may remember my “do it yourself UHI kit” for vehicles…now there’s one for a bike: Studying urban heat island effect on a…

A new paper showing how UHI and energy consumption are linked to long-term temperature change in China

Dr. Roger Pielke Sr. highlighted this major new paper in JGR yesterday, I consider it important as it relates to the works I’m doing on station siting. The key points of the paper are supportive of what I’ve  been saying for years, and show a significant effect on temperature trends, just as we’ve noted in…

Law of unintended consequences bites the ‘white roof UHI solution’ – causes reduced rainfall

From Arizona State University Researchers emphasize evaluation of tradeoffs in battling urban heat island Urbanization will increase average temperatures in Arizona’s Sun Corridor and white roofs can combat that, but not without consequences for the region’s hydroclimate TEMPE, Ariz. – A team of researchers from Arizona State University have found that warming resulting from megapolitan…

Recent paper demonstrates relationship between temperature and population density in the UHI of New Delhi

This gives credence to Dr. Roy Spencer’s population adjusted ISH surface temperature data for the USA Impact of population density on the surface temperature and micro-climate of Delhi Javed Mallick1 and Atiqur Rahman2,* 1Department of Civil Engineering, King Khalid University, Abha, Kingdom of Saudi Arabia 2Remote Sensing and GIS Division, Department of Geography, Faculty of…

Little Ice Age Thermometers- Historic variations in temperatures Part 3 -BEST confirms extended period of warming.

Guest post by Tony Brown This short paper is a preliminary examination of BEST data to 1753, as compared to the Central England Temperature Record (CET) to 1660 (instrumental record) and 1538 (Extended by Tony Brown using thousands of contemporary observations) This extension to 1538 was a central part of my article ‘The Long Slow…

Important New Paper on the Nocturnal Boundary Layer, Mixing, and Radiative Forcing as it applies to GHCN weather stations

From Dr. Roger Pielke Sr. comes word of an important new paper that shows how the air near the ground (boundary layer) is highly affected by sensitive nighttime dynamics, which show up in the Tmin of weather station data (GHCN stations in this case)  but are not captured by climate models. The paper also showed…

More modeling madness: increased temperature ‘may’ cause more violent thunderstorms – but other studies show what they missed

From Tel Aviv University, another science press release with “could and may” qualifiers:  Climate Change May Lead to Fewer — But More Violent — Thunderstorms Number of flash floods and forest fires could increase with temperature, says TAU researcher Researchers are working to identify exactly how a changing climate will impact specific elements of weather,…

The UHI’s of Texas are upon you

Joe D’Aleo suggested earlier today that I take a look at some of the data from NCDC’s web page called “US climate at a glance“. This page allows comparisons of the actual data not anomalies used in the NCDC USHCN Surface temperature network. The NCDC web page allows you to compare and not only the…

UAH continental US Temperature for May 2012: +1.26 deg. C

by Roy W. Spencer, Ph. D. The U.S. lower-48 surface temperature anomaly from my population density-adjusted (PDAT) dataset was 1.26 deg. C above the 1973-2012 average for May 2012, with a 1973-2012 linear warming trend of +0.14 deg. C/decade (click for full-size version): The corresponding USHCN anomaly computed relative to the same base period was…

Trees do 8 times better in the New York City Urban Heat Island

From the The Earth Institute at Columbia University Do urban ‘heat islands’ hint at trees of future? Common oaks get a boost in New York’s Central Park City streets can be mean, but somewhere near Brooklyn, a tree grows far better than its country cousins, due to chronically elevated city heat levels, says a new…