Navigation Links
Errors in the measurement of global warming corrected

The effect of the sun's heat on weather balloons largely accounts for a data discrepancy that has long contributed to a dispute over the existence of global warming, according to a report by scientists at Yale University and the National Oceanic and Atmospheric Administration (NOAA).

The report, to be published in the journal Science, says that direct heat of the sun on temperature probes of the weather balloon (radiosonde) probably explains the discrepancy between reports showing that atmospheric temperatures have been unchanged since the 1970's, while temperatures at the Earth's surface are rising.

For the last 40 years radiosonde temperature information has been collected twice each day from stations around the world at local times that correspond to 00:00 and 12:00 Greenwich Mean Time. Some measurements were taken in daylight, others in darkness.

"Even though models predict a close link between atmospheric and surface temperatures, there has been a large difference in the actual measurements," said Steven C. Sherwood, associate professor of geology and geophysics at Yale, and lead author. "This has muddied the interpretation of reported warming." Most scientists have concluded the surface warming has partly resulted from a buildup of greenhouse gases in the atmosphere.

The key to the error in climate change estimates lay in instrument design, according to this study. With exposed sensors, measurement taken in daylight read too warm, and while solar heating had a measurable impact on the earlier designs, the effect became negligible in more recent designs.

"It's like being outside on a hot day -- it feels hotter when you are standing in the direct sun than when you are standing in the shade," said Sherwood. "We can't hang our hats on the old balloon numbers."

After taking this problem into account, the researchers estimate there has been an increase of 0.2 degree Celsius (°C) in the average global temperature per dec ade for the last thirty years. Over the next century, global surface temperatures are expected to increase by 2 to 4°C. However, year-to-year and region to region increases may vary considerably, with a smaller increase in the tropics but 10 degrees or more possible in some Polar Regions.

"Unfortunately, the warming is in an accelerating trend -- the climate has not yet caught up with what we've already put into the atmosphere," said Sherwood. "There are steps we should take, but it seems that shaking people out of complacency will take a strong incentive."


'"/>

Source:Yale University


Related biology news :

1. Scientists collaborate to assess health of global environment
2. Nonlinear Dynamics announces more details of its global partnership with PerkinElmer
3. DuPonts first biologically derived polymer receives global recognition
4. Virus-host interactions at sea effect global photosynthesis
5. Hopkins AIDS experts issue warning about global efforts to provide drug therapies
6. Scientists discover global pattern of big fish diversity in open oceans
7. AIDS expert says global strategy needed to combat feminization of HIV/AIDS
8. Marine bacterium suspected to play role in global carbon and nitrogen cycles
9. Clean skies=faster global warming?
10. Storing carbon to combat global warming may cause other environmental problems, study suggests
11. The shape of things to come: Morphology database going global
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:4/11/2017)... GARDENS, Fla. , April 11, 2017 /PRNewswire/ ... management and secure authentication solutions, today announced that ... by Intelligence Advanced Research Projects Activity (IARPA) to ... IARPA,s Thor program. "Innovation has been ... and IARPA,s Thor program will allow us to ...
(Date:4/11/2017)... BROOKLYN, N.Y. , April 11, 2017 /PRNewswire-USNewswire/ ... identical fingerprints, but researchers at the New York ... University College of Engineering have found that partial ... fingerprint-based security systems used in mobile phones and ... previously thought. The vulnerability lies in ...
(Date:4/6/2017)... -- Forecasts by Product Type (EAC), Biometrics, ... (Transportation & Logistics, Government & Public Sector, Utilities / ... Facility, Nuclear Power), Industrial, Retail, Business Organisation (BFSI), Hospitality ... looking for a definitive report on the $27.9bn Access ... ...
Breaking Biology News(10 mins):
(Date:6/28/2017)... 2017 Spectrecology LLC has announced a 4 ... and research dollars. The program is designed to help ... spectroscopy and photonics equipment despite current funding challenges.  The ... Innovations in Spectroscopy Grants – Discounts ... used for the classroom or research. ...
(Date:6/28/2017)... (PRWEB) , ... June 28, ... ... Siemens’ STAR-CCM+® software for multiphysics computational fluid dynamics (CFD) simulation and analysis ... and optimization. STAR-CCM+ version 12.04 introduces Design Manager, allowing users to easily ...
(Date:6/27/2017)... ... June 27, 2017 , ... Biodex Medical Systems, Inc. announces ... in one device. This assistive aid lifts patients safely from a seated to a ... lift mechanics. The Mobility Assist is the latest in a line of Biodex products ...
(Date:6/26/2017)... ... ... Third Wave Bioactives, LLC announces the addition of Brett Thompson. Brett joins ... and ensuring quality customer experience. , Brett brings to Third Wave Bioactives ... and sales roles. “Brett’s background working with customers and eye for market opportunities make ...
Breaking Biology Technology: