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Mysterious Changes in Ocean Salt Spur NASA Expedition

September 11, 2012 Comments off

weather.aol.com

By Live Science

  • The Woods Hole Oceanographic Institution’s research vessel Knorr docked before its departure on Sept. 6 to study salinity in the mid-Atlantic ocean. (NASA)
    By Wynne Parry

    Over the past 50 years, the salty parts of the oceans have become saltier and the fresh regions have become fresher, and the degree of change is greater than scientists can explain.

    Researchers are heading out into one particularly salty ocean region, in the middle of the North Atlantic Ocean, in the hopes of better understanding what drives variation in salinity in the upper ocean.

    Ultimately, they hope, research like this will offer insight on the dynamics behind the dramatic changes in the ocean’s salt content.

    Many oceanographers have a hunch about what is going on: Climate change, Ray Schmitt, a senior scientist at the Woods Hole Oceanographic Institution, told journalists during a news conference Wednesday (Sept. 5).

    “Climate is changing all the time, and some of that change is due to natural variation,” Schmitt said. “The 50-year trend we are talking about, most of us believe is really due to the general trend of Read more…

Greenland ice sheet may melt completely with 1.6 degrees global warming

March 12, 2012 Comments off

esciencenews

Greenland ice sheetPhoto: christine zenino/Flickr

The Greenland ice sheet is likely to be more vulnerable to global warming than previously thought. The temperature threshold for melting the ice sheet completely is in the range of 0.8 to 3.2 degrees Celsius of global warming, with a best estimate of 1.6 degrees above pre-industrial levels, shows a new study by scientists from the Potsdam Institute for Climate Impact Research (PIK) and the Universidad Complutense de Madrid. Today, already 0.8 degrees of global warming has been observed. Substantial melting of land ice could contribute to long-term sea-level rise of several meters and therefore it potentially affects the lives of many millions of people. The time it takes before Read more…

NASA admits all previous warming trends caused by sun

April 4, 2011 Comments off

helium.com

I wonder what Al Gore’s rebuttal is going to sound like…

Under mounting pressure from scientists that reject the politically popularized man-made global warming and climate models—the Anthropogenic Global Warming (AGW) theory—the American space agency NASA has admitted that all past warming trends were driven by solar activity.

A victory for the man-made ‘global warming deniers’

As more scientists have joined the outcry over the politicization of Earth’s climate cycles—the current number exceeds 20,000—promoters of the AGW model have denounced the “global warming deniers” countering that little evidence supports the view that the sun is driving the observed warming trend.

Now, however, new study released from NASA’s Goddard Space Flight Center in Greenbelt, Maryland measuring the global temperature variance during the past 100 years has found the sun’s heat and variable cycles have indeed made a significant, measurable impact and greatly influenced Earth’s climate.

In fact, the influence extends as far back as the Read more…

Drought In Amazon Could Lead To Accelerated Global Warming

March 30, 2011 Comments off

ibtimes.com

A new study reveals a drought last year in the Amazon basin caused the forest to lose significant levels of vegetation, which in turn could accelerate the pace of global warming.

The study, conducted by an international team of scientists and funded by NASA, uses specific satellite imaging data provided by the agency to draw its conclusions. The Moderate Resolution Imaging Spectroradiometer (MODIS) and Tropical Rainfall Measuring Mission (TRMM) satellites provided more than a decade’s worth of data for scientists who studied the de-vegetation of the Amazon rainforest.

(Photo: NASA/BU) NASA satellite sensors, such as MODIS, showed an average pattern of greenness of vegetation on South America: Amazon forests which have very high leaf area are shown in red and purple colors, the adjacent cerrado (savannas) which have lower leaf area are shown in shades of green, and the coastal deserts are shown in yellow colors.

 

The scientists say changing climates with warmer temperatures and altered rainfall could lead to the rainforests turning into grasslands or woody savannas. This causes carbon stored in the rotting wood to be released into the atmosphere, which would add to the greenhouse gases present.

“The greenness levels of Amazonian vegetation — a measure of its health — decreased dramatically over an area more than three and one-half times the size of Texas and did not recover to normal levels, even after the drought ended in late October 2010,” Liang Xu, the study’s lead author from Boston University, said in a statement.

“The MODIS vegetation greenness data suggest a more widespread, severe and long-lasting impact to Amazonian vegetation than Read more…

Himalayan glaciers not melting because of climate change, report find

January 27, 2011 1 comment

Himalayan glaciers are actually advancing rather than retreating, claims the first major study since a controversial UN report said they would be melted within quarter of a century.

Himalayan glaciers not melting because of climate change, report finds  

The Passu glacier in the Karakorum region of Pakistan Photo: ALAMY
By Dean Nelson, New Delhi and Richard Alleyne
 

Researchers have discovered that contrary to popular belief half of the ice flows in the Karakoram range of the mountains are actually growing rather than shrinking.

The discovery adds a new twist to the row over whether global warming is causing the world’s highest mountain range to lose its ice cover.

It further challenges claims made in a 2007 report by the UN’s Intergovernmental Panel on Climate Change that the glaciers would be gone by 2035.

Although the head of the panel Dr Rajendra Pachauri later admitted the claim was an error gleaned from unchecked research, he maintained that global warming was melting the glaciers at “a rapid rate”, threatening floods throughout north India.

The new study by scientists at the Universities of California and Potsdam has found that Read more…