It has been a while since I have posted progress on our DOE-funded research into the Urban Heat Island (UHI) effect in the GHCN station temperatures used to monitor land-based global warming. It should be remembered that everything I post on this subject is (as is usually the case) a work in progress.What I am addressing is the existence of localized long-term warming associated with population increases which are over and above the large-scale warming due to humanity’s greenhouse gas emissions … [Read more...]
Americans Increasingly Choose a Warmer Life
We hear that a new El Nino forming in the Pacific Ocean is likely to push global-average temperatures to new record highs in 2023.Setting aside the fact that we have no idea if current temperatures are warmer than during the Medieval Warm Period of ~1,000 years ago, I have to ask…So what?Doing something about global warming depends a lot on how much we are asked to pay to fix it. If it was cheap and practical, we would have already transitioned to renewable energy sources.It also depends … [Read more...]
Climate Fearmongering Reaches Stratospheric Heights
A new paper by Santer et al., provocatively entitled “Exceptional stratospheric contribution to human fingerprints on atmospheric temperature,” goes where no serious climate scientist should go: it has conflated stratospheric cooling with global warming.The paper starts out summarizing the supposed importance of their work, which is worth quoting in its entirety (bold emphasis added):“Differences between tropospheric and lower stratospheric temperature trends have long been recognized as a … [Read more...]
Epic Fail in America’s Heartland: Climate Models Greatly Overestimate Corn Belt Warming
For the last decade, I’ve been providing long-range U.S. Corn Belt forecasts to a company that monitors and forecasts global grain production and market forces. My continuing theme has been, “don’t believe gloom and doom forecasts for the future of the U.S. Corn Belt.”The climate models relied upon by the United Nations Intergovernmental Panel on Climate Change (IPCC) are known to overestimate warming compared to observations. Depending upon the region (global? U.S.?), temperature metric … [Read more...]
UAH Global Temperature Update for November, 2022: +0.17 deg. C
Sorry for the late posting of the global temperature update, I’ve been busy responding to reviewers of one of our papers for publication.The Version 6 global average lower tropospheric temperature (LT) anomaly for November 2022 was +0.17 deg. C departure from the 1991-2020 mean. This is down from the October anomaly of +0.32 deg. CThe linear warming trend since January, 1979 now stands at +0.13 C/decade (+0.12 C/decade over the global-averaged oceans, and +0.18 C/decade over global-averaged … [Read more...]
The Warming that Happens in Vegas, Stays in Vegas
Now that I’m back to researching the surface air temperature record and the Urban Heat Island (UHI) effect, I decided to revisit the temperatures in Las Vegas, Nevada. It’s been over 8 years since I posted about Las Vegas being the poster child for the UHI effect and I showed some warming trend calculations from the hourly temperature data at McCarren International Airport (now Harry Reid International Airport… not kidding) which suggested that much of the warming there has been from … [Read more...]
Canadian Summer Urban Heat Island Effects: Some Results in Alberta
SummaryComparison of rural with urban temperature monitoring sites across Canada during the summers of 1978-2022 shows the expected average nighttime warm bias in urban areas, with a weaker daytime effect. When applied to the Landsat imagery-based diagnoses of increased urbanization over time, 20% of the temperature trends in a small region encompassing Calgary and Edmonton are found to be due to increasing urbanization. Calgary leads the list of Canadian cities with increased urbanization, with … [Read more...]
50-Year U.S. Summer Temperature Trends: ALL 36 Climate Models Are Too Warm
I’ll get right to the results, which are pretty straightforward.As seen in the accompanying plot, 50-year (1973-2022) summer (June/July/August) temperature trends for the contiguous 48 U.S. states from 36 CMIP-6 climate model experiments average nearly twice the warming rate as observed by the NOAA climate division dataset.The 36 models are those cataloged at the KNMI Climate Explorer website, using Tas (surface air temperature), one member per model, for the ssp245 radiative forcing scenario. … [Read more...]
De-Urbanization of Surface Temperatures with the Landsat-Based “Built-Up” Dataset
A relatively new global dataset of urbanization changes over the 40-year period 1975-2014 based upon Landsat data is used to determine the average effect urbanization has had on surface temperatures. A method is presented to compute the magnitude of the Urban Heat Island (UHI) effect on temperatures using the example of summertime 09 UTC (early morning) Integrated Surface Database (ISD) hourly data (mostly from airports) over the period 1973-2022 by comparing urbanization differences to … [Read more...]
UAH Global Temperature Update for June 2022: +0.06 deg. C
The Version 6.0 global average lower tropospheric temperature (LT) anomaly for June 2022 was +0.06 deg. C, down (again) from the May 2022 value of +0.17 deg. C.Tropical CoolnessThe tropical (20N-20S) anomaly for June was -0.36 deg. C, which is the coolest monthly anomaly in over 10 years, the coolest June in 22 years, and the 9th coolest June in the 44-year satellite record.The linear warming trend since January, 1979 still stands at +0.13 C/decade (+0.11 C/decade over the global-averaged … [Read more...]
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