Showing posts with label icy. Show all posts
Showing posts with label icy. Show all posts

Dipole Explains How Climate Change can Cause Diverging Weather Systems

A dipole is a term that has been coined by researchers to explain two different weather systems such as hot dry weather in the West and cold snowy weather in the Midwest and the East. Traditionally, a dipole is a term used in physics and chemistry to describe two electric charges or magnetic poles that have equal magnitudes but opposite signs and are separated by a small distance. It is also used in chemistry to define a molecule in which the center of positive charge does not coincide with the center of negative charge.

Research conducted by climate scientist Simon Wang at Utah State University employs the term to explain how climate change may be behind two diverging weather systems. Namely, the drought in California and the cold and precipitation elsewhere on the continent.

In 2009, Wang related the dipole anomaly to record lows in Arctic summer sea ice extent.

In Wang's research a dipole refers to the combination of a strong Western high pressure ridge and deep Great Lakes low pressure trough. That dipole is linked to a recently found precursor to El Nino. Wang's study notes that this precursor is amplified by a build-up of heat-trapping greenhouse gases.

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Global Warming Continues Unabated Despite a Seemingly Endless Winter in Parts of North America

Even if it is still cold and stormy in parts of North America, the data reveals that the global warming trend is strong and getting stronger. As some of us are still waiting for the first flowers to bloom, winter may seem eternal. Cold weather can give the impression that the heat may be abating somewhat, however the facts reveal that global warming shows no signs of easing.

For those that live in the Eastern US and Canada this was a cold winter (parts of Canada registered one of the coldest months of February on record) and for some the cold is persisting into spring. The combination of the polar vortex, winter storms and a late spring may even lead some who live in these regions to surmise that the global warming trend has abated. However, such suppositions are not born out by the facts.

Depending on who you listen to last year (2013) was either the 4th or the 7th hottest year on record. January which from where many of us stood seemed abnormally frigid, was actually a continuation of the global warming trend. Globally, it was the fourth-warmest January since record keeping began in 1880. Globally, February was the 21st warmest on record. February was also the 348th consecutive month with above-average temperatures (compared to the 20th century average). The period from December 2013 to February 2014 was the 8th warmest on record globally.

To add fuel to the fire of global warming, the US National Climatic Data Center reported that we are on track for yet another record or near-record warm year in 2014. In fact, we have seen evidence of global warming for almost three consecutive decades.

Not only is it hot it is getting hotter. NOAA data shows that month after month the earth continues to warm, with global average temperatures being among their top 10 warmest for the ninth straight month.

While some parts of North America were experiencing bitter cold, other places like Scandinavia, Russia and Finland have been experiencing some of the warmest temperatures on record.

So no, global warming is not letting up and this underscores the importance of looking at the big picture and not extrapolating from local weather conditions.

Related
Dipole Explains How Climate Change can Cause Diverging Weather Systems
Extreme Cold in North America is due to Stratospheric Warming 
Global Warming Continues Unabated Despite Cold Snaps 
Global Warming Continues Unabated Despite a Seemingly Endless Winter in Parts of North America
"Catastrophic" Ice Storm Slams the Southeast and Heads North

Global Warming Continues Unabated Despite Cold Snaps

While climate deniers love to point to cold weather as evidence that global warming is a farce. The data indicates that despite the polar vortex and the associated colder temperatures, we are still experiencing some of the warmest weather on record. According to the NOAA January 2014 was one of the hottest months ever recorded both on land and at sea.

The combined global land and ocean surface temperatures (January)

The warmest since 2007 and the fourth warmest on record at 12.7°C (54.8°F), or 0.65°C (1.17°F) above the 20th century average of 12.0°C (53.6°F). The margin of error associated with this temperature is ± 0.08°C (± 0.14°F).

The global land temperature (January)

 Highest since 2007 and the fourth highest on record for January, at 1.17°C (2.11°F) above the 20th century average of 2.8°C (37.0°F). The margin of error is ± 0.18°C (± 0.32°F).

The global ocean temperature(January)

The global sea surface temperature was 0.46°C (0.83°F) above the 20th century average of 15.8°C (60.5°F), the highest since 2010 and seventh highest on record for January. The margin of error is ± 0.04°C (± 0.07°F).

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