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Posts Tagged ‘NASA’

Global Cooling Measured by 4 Major Authorities

Posted by Tony Listi on February 27, 2008

Twelve-month long drop in world temperatures wipes out a century of warming

Over the past year, anecdotal evidence for a cooling planet has exploded. China has its coldest winter in 100 years. Baghdad sees its first snow in all recorded history. North America has the most snowcover in 50 years, with places like Wisconsin the highest since record-keeping began. Record levels of Antarctic sea ice, record cold in Minnesota, Texas, Florida, Mexico, Australia, Iran, Greece, South Africa, Greenland, Argentina, Chile — the list goes on and on. No more than anecdotal evidence, to be sure. But now, that evidence has been supplanted by hard scientific fact. All four major global temperature tracking outlets (Hadley, NASA’s GISS, UAH, RSS) have released updated data. All show that over the past year, global temperatures have dropped precipitously.A compiled list of all the sources can be seen here.  The total amount of cooling ranges from 0.65C up to 0.75C — a value large enough to wipe out nearly all the warming recorded over the past 100 years. All in one year’s time. For all four sources, it’s the single fastest temperature change ever recorded, either up or down.

Scientists quoted in a past DailyTech article link the cooling to reduced solar activity which they claim is a much larger driver of climate change than man-made greenhouse gases. The dramatic cooling seen in just 12 months time seems to bear that out. While the data doesn’t itself disprove that carbon dioxide is acting to warm the planet, it does demonstrate clearly that more powerful factors are now cooling it.

Let’s hope those factors stop fast. Cold is more damaging than heat. The mean temperature of the planet is about 54 degrees. Humans — and most of the crops and animals we depend on — prefer a temperature closer to 70.

Historically, the warm periods such as the Medieval Climate Optimum were beneficial for civilization. Corresponding cooling events such as the Little Ice Age, though, were uniformly bad news.

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Arctic Sea Ice Re-Freezing at Record Pace, says NASA

Posted by Tony Listi on December 13, 2007

Melting and now freezing again?! Just like the past natural cyclical history of the ice in the Arctic?! Go to the site (an environmentalist one too!) and see the dramatic NASA picture of just how much ice refroze in a matter of 2 months!! Why are people so concerned (at least outwardly; How many of them practice what they preach?) about this fraud alarmism??? Clark, I expect a reply if you really have the open-mindedness characteristic of a true person of Reason. 

Arctic Sea Ice Re-Freezing at Record Pace
After Record Summer Melt, Recovery Still Lags

12.12.2007 9:38 AM

By Dan Shapley

The record melting of Arctic sea ice observed this summer and fall led to record-low levels of ice in both September and October, but a record-setting pace of re-freezing in November, according to the NASA Earth Observatory. Some 58,000 square miles of ice formed per day for 10 days in late October and early November, a new record.

Still, the extent of sea ice recorded in November was well shy of the median extent observed over the past quarter century, as the image from Nov. 14 (above, right) shows. The dramatic increase in ice is evident, when compared to the record-low amount observed Sept. 16 (below, right). In both images, 100% sea ice is shown in white, and the yellow line encompasses the area ion which there was at least 15% ice cover in at least half of the 25-year record for the given month.

The record melting of Arctic sea ice this summer was widely viewed as a harbinger of global warming, though unusual wind patterns played a role and many factors affecting fluctuations in Arctic ice are poorly understood by scientists. Still, so much ice melted that the fabled Northwest passage opened for the first time in history, and the melting broke a record, set just two years ago and by a country mile, that at the time was seen as unprecedented and worrying.

The area of persistent open water north of Alaska and eastern Siberia, according to NASA, is unusual for this time of year, though not unprecedented. This area was also largely free of ice in November 2002 and especially November 2006.

Here’s how NASA explains the record re-growth of ice over that 10-day period in October and November:

“Record sea ice growth rates after a record low may sound surprising at first, but it is not completely unexpected. The more ice that survives the summer melt, the less open water there is for new ice to grow. When summertime ice extent hits a record low, on the other hand, large areas of open water provide room for the ice to grow once temperatures cool off enough. While summer warming of the upper ocean surface can cause wintertime sea ice regrowth to lag initially, as the fall season progresses and sunlight weakens, the rate of energy loss from the ocean increases. That heat loss coupled with a large area of open water creates ideal conditions for sea ice to form rapidly over large areas.”

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