Summary: As the pause in the warming of the world’s surface temperature enters its 17th year, activists hide this by focusing on areas of the world reporting record warm weather (areas with cold weather are un-news). We need not fall for this deceit. NASA funds a monthly report of global temperature measured by satellites — a consistently high-quality data set going back to 1979 (roughly the end of the previous mini-cooling cycle). The truth is out there for people willing to learn it.
Contents
- Status report: what do satellites tell us about global warming?
- The UK Met Office shows the long-term history of warming
- Who produces this satellite data & analysis?
- About The Elusive Absolute Surface Air Temperature (SAT)
- A few key things to remember about global warming!
- For More Information
To the right is a typical over-the-top image to arouse fear, about a world now less than one °F warmer than the 30-year average.
(1) Status report: what do satellites tell us about global warming in October 2013?
Satellites provide the most comprehensive and reliable record of the atmosphere’s warming since 1979.
The November 2013 Global Temperature Report
by the Earth System Science Center of the University of Alabama in Huntsville
(Blue is cold; red warm}. Click to enlarge.
.
Key points from the report, which show a world that has warmed since 1979, but only slightly (few alarmists know this; fewer admit it):
- Global composite temperature in November: +0.19°C (0.34°F) above the average for November during 1981-2010.
- Global climate trend of temperature starting in 16 November 1978: +0.14°C (0.3°F) per decade.
- Compared to seasonal norms, in November the coolest area on the globe was in northwestern Greenland, where temperatures in the troposphere were about 4.16°C (7.5°F) cooler than normal,
- The warmest area was in Eastern Antarctica, where tropospheric temperatures were 5.32°C (almost 9.6°F) warmer than seasonal norms.
- Anomalies are computed per the World Meteorological Organization (WMO) recommended method, comparing the current temperatures vs. a 30 year base period ending with the latest decade.
Let’s look at the satellite data since 1979. It shows, very roughly, 2 decades of cool weather, followed by 15 years of warm weather (click to enlarge):
.
.
Roy Spencer (principal scientists on the team) shows another perspective on this data (at his website). Wide swings in temperature; a relatively flat trend since 1998 (even more so since 2000). For more about the pause see summaries of the growing body research about it here, and the IPCC’s view here.
.
(2) The UK Met Office shows the long-term history — the vital context
These numbers cannot be properly understood until put in a historical context, from page 10 of “The Recent Pause in Global Warming” published by the UK Met Office in July 2013. Anthropogenic factors became the largest (not the only) driver since roughly 1950.
.
(3) Who produces this satellite data and analysis?
About the global satellite data
As part of an ongoing joint project between The University of Alabama in Huntsville, NOAA and NASA, John Christy (professor of atmospheric science and director of the Earth System Science Center (ESSC) at U AL-Huntsville) and Dr. Roy Spencer (an ESSC principal scientist) use data gathered by advanced microwave sounding units on NOAA and NASA satellites to get accurate temperature readings for almost all regions of the Earth. This includes remote desert, ocean and rain forest areas where reliable climate data are not otherwise available.
The satellite-based instruments measure the temperature of the atmosphere from the surface up to an altitude of about 8,000 above sea level.
Neither Christy nor Spencer receives any research support or funding from oil, coal or industrial companies or organizations, or from any private or special interest groups. All of their climate research funding comes from federal and state grants or contracts.
(4) About The Elusive Absolute Surface Air Temperature (SAT)
Q. What exactly do we mean by Surface Air Temperature?
A. I doubt that there is a general agreement how to answer this question. Even at the same location, the temperature near the ground may be very different from the temperature 5 ft above the ground and different again from 10 ft or 50 ft above the ground. Particularly in the presence of vegetation (say in a rain forest), the temperature above the vegetation may be very different from the temperature below the top of the vegetation. A reasonable suggestion might be to use the average temperature of the first 50 ft of air either above ground or above the top of the vegetation. To measure SAT we have to agree on what it is and, as far as I know, no such standard has been suggested or generally adopted. Even if the 50 ft standard were adopted, I cannot imagine that a weather station would build a 50 ft stack of thermometers to be able to find the true SAT at its location.
Q. What do we mean by daily mean SAT?
A. Again, there is no universally accepted correct answer. Should we note the temperature every 6 hours and report the mean, should we do it every 2 hours, hourly, have a machine record it every second, or simply take the average of the highest and lowest temperature of the day ? On some days the various methods may lead to drastically different results.
Read the rest here.
(5) A few important things to remember about global warming
While cheering for their faction of scientists, laypeople often lose sight of the big picture — the key elements for making public policy about this important issue.
(a) The work of the IPCC and the major science institutes are the best guides for information about these issues.
(b) The world has been warming during the past two centuries, in a succession of warming, cooling, and pauses. Since roughly 1950 anthropogenic causes have been the largest driver. Warming paused sometime in 1998-2000.
- When did we start global warming? See the surprising answer., 18 October 2012
- Still good news: global temperatures remain stable, at least for now., 14 October 2012 — Scientists analysis of the pause
- The IPCC sees the pause in global warming!, 18 December 2012
(c) There is a debate about the attribution (causes) of past warming — which probably varied over time — between natural drivers (e.g., rebound from the Little Ice Age, solar influences) and anthropogenic drivers (eg, CO2, aerosols, land use changes). Other that that stated in #3, the IPCC’s reports make few claims about attribution of climate activity, as this remains actively debated in the literature.
(d) There is an even larger debate about climate forecasts, both the extent of future CO2 emissions and the net effects of the various natural and anthropogenic drivers.
- One of the most important questions we face: when will the pause in global warming end?, 25 August 2013
- Possible political effects of the pause in global warming, 26 August 2013
(e) For the past five years my recommendations have been the same:
- More funding for climate sciences. Many key aspects (eg, global temperature data collection and analysis) are grossly underfunded.
- Wider involvement of relevant experts in this debate. For example, geologists, statisticians and software engineers have been largely excluded — although their fields of knowledge are deeply involved.
- Start today a well-funded conversion to non-carbon-based energy sources by the second half of the 21st century; for both environmental and economic reasons (see these posts for details).
(f) Posts about preparing for climate change:
- How can we save the world from climate change?, 2 January 2013
- Preparing for the future: should we be precautionary or proactionary?, 22 August 2013
(6) For More Information
(a) Reference Pages about climate on the FM sites:
(b) Other posts in this series about global warming:
- Still good news: global temperatures remain stable, at least for now., 14 October 2012 — Scientists’ analysis of the pause
- When did we start global warming? See the surprising answer., 18 October 2012
- The IPCC sees the pause in global warming!, 18 December 2012
- One of the most important questions we face: when will the pause in global warming end?, 25 August 2013
- Possible political effects of the pause in global warming, 26 August 2013
.
.
