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:8/29/2018)... Calif. (PRWEB) , ... August 28, 2018 , ... ... cluster and cloud infrastructure automation software, announced that Data In Science Technologies has ... The HudsonAlpha Institute for Biotechnology is a non-profit genomics and genetics research ...
(Date:8/29/2018)... ... August 28, 2018 , ... ... company unlocking the full power of positron emission tomography (PET), today launched ... Fuzionaire Dx is helping clinicians and researchers study and cure debilitating diseases, ...
(Date:8/26/2018)... (PRWEB) , ... August 23, 2018 , ... ... it has for increased sensitivity and specificity over more commonly used analytical techniques. ... and the added burden of development and validation of methods that must be ...
Breaking Biology News(10 mins):
(Date:8/23/2018)... ... 22, 2018 , ... Crucial Data Solutions, Inc. announces the ... first fully-featured app for electronic data capture (EDC) and electronic participant reported outcomes ... percent of the market share for mobile devices worldwide; in turn, this enables ...
(Date:8/21/2018)... ... 21, 2018 , ... The Connecticut Technology Council (CTC) and Marcum LLP today ... technology companies in Connecticut. This year’s group of top-ranked companies will be honored at ... Connecticut Convention Center in Hartford. A complete list of the Marcum Tech Top 40 ...
(Date:8/17/2018)... Calif. (PRWEB) , ... August 16, 2018 , ... ... genetic testing, announced their results from the AmbryShare project were published today in ... genes in the largest exome study ever conducted. , Every year hereditary breast ...
(Date:8/14/2018)... ... August 14, 2018 , ... Buprenorphine (BUP) ... disorder. BUP is often prescribed as a sublingual co-formulation with the opioid antagonist ... webinar, participants will learn from a review of the pharmacokinetics of BUP, NBP, ...
Breaking Biology Technology: