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:3/28/2017)... , March 28, 2017 The ... Hardware (Camera, Monitors, Servers, Storage Devices), Software (Video Analytics, ... Region - Global Forecast to 2022", published by MarketsandMarkets, ... 2016 and is projected to reach USD 75.64 Billion ... and 2022. The base year considered for the study ...
(Date:3/24/2017)... , March 24, 2017 The Controller General ... Controller Mr. Abdulla Algeen have received the prestigious international IAIR ... Continue Reading ... ... picture) and Deputy Controller Abdulla Algeen (small picture on the right) have ...
(Date:3/23/2017)... -- The report "Gesture Recognition and Touchless Sensing Market by Technology ... Forecast to 2022", published by MarketsandMarkets, the market is expected to be worth ... and 2022. Continue Reading ... ... ...
Breaking Biology News(10 mins):
(Date:10/12/2017)... ... October 12, 2017 , ... ... genomics analysis platform specifically designed for life science researchers to analyze and ... researcher Rosalind Franklin, who made a major contribution to the discovery of ...
(Date:10/11/2017)... LINDA, CA (PRWEB) , ... October 11, 2017 ... ... to upregulate any gene in its endogenous context, enabling overexpression experiments and avoiding ... (CRISPRa) system with small RNA guides is transformative for performing systematic gain-of-function studies. ...
(Date:10/11/2017)... (PRWEB) , ... October 11, 2017 , ... ComplianceOnline’s Medical ... place on 7th and 8th June 2018 in San Francisco, CA. The Summit brings ... well as several distinguished CEOs, board directors and government officials from around the world ...
(Date:10/11/2017)... 2017  VMS BioMarketing, a leading provider of patient support ... Nurse Educator (CNE) network, which will launch this week. The ... health care professionals to enhance the patient care experience by ... other health care professionals to help women who have been ... ...
Breaking Biology Technology: