Extreme summer weather in northern mid-latitudes linked to a vanishing cryosphere

[ScienceRocks]

Extreme summer weather in northern mid-latitudes linked to a vanishing cryosphere
Qiuhong Tang,
Xuejun Zhang
& Jennifer A. Francis
Affiliations
Contributions
Corresponding author
Nature Climate Change (2013) doi:10.1038/nclimate2065 Received 11 August 2013 Accepted 01 November 2013 Published online 08 December 2013

The past decade has seen an exceptional number of unprecedented summer extreme weather events1, 2, 3, 4 in northern mid-latitudes, along with record declines in both summer Arctic sea ice5, 6 and snow cover on high-latitude land7. The underlying mechanisms that link the shrinking cryosphere with summer extreme weather, however, remain unclear8, 9, 10, 11, 12. Here, we combine satellite observations of early summer snow cover and summer sea-ice extent13 with atmospheric reanalysis data14 to demonstrate associations between summer weather patterns in mid-latitudes and losses of snow and sea ice. Results suggest that the atmospheric circulation responds differently to changes in the ice and snow extents, with a stronger response to sea-ice loss, even though its reduction is half as large as that for the snow cover. Atmospheric changes associated with the combined snow/ice reductions reveal widespread upper-level height increases, weaker upper-level zonal winds at high latitudes, a more amplified upper-level pattern, and a general northward shift in the jet stream. More frequent extreme summer heat events over mid-latitude continents are linked with reduced sea ice and snow through these circulation changes.

http://www.nature.com/nclimate/journal/vaop/ncurrent/full/nclimate2065.html

 

[ScienceRocks]

Arctic Warming Drives More Extreme Summer Heat Waves, Droughts And Deluges, Study Finds

A new study links the past decade’s “exceptional number of unprecedented summer extreme weather events” in the U.S. and Europe with the “record declines in both summer Arctic sea ice and snow cover on high-latitude land.” Researchers at the Chinese Academy of Sciences, along with Rutgers Prof. Jennifer Francis, make the case in a Nature Climate Change study, “Extreme summer weather in northern mid-latitudes linked to a vanishing cryosphere” (subs. req’d).

Scientists predicted a decade ago that Arctic ice loss would shift storm tracks and bring on worse western droughts of the kind we are now seeing. Recent studies find that Arctic sea ice loss may well usher changes in the jet stream that lead to more U.S. extreme weather events (see here and here).

We’ve known for a long time that global warming melts highly reflective white ice and snow, which is replaced by the dark blue sea or dark land, both of which absorb far more sunlight and hence far more solar energy. That is one of the many sources of “polar amplification,” whereby the Arctic warms much faster than other parts of the globe. Now it seems increasingly clear that the amplified Arctic warming in turn amplifies extreme weather by shifting and weakening the jetstream (see video here).

The new study notes that in the past three decades, Arctic sea ice extent during late summer has fallen some 8 percent per decade, while spring snow coverage in June has fallen some 18 percent percent per decade. The researchers “combine satellite observations of early summer snow cover and summer sea-ice extent with atmospheric reanalysis data” to shown a linkage between those snow and ice losses and mid-latitude summer weather patterns:


Atmospheric changes associated with the combined snow/ice reductions reveal widespread upper-level height increases, weaker upper-level zonal winds at high latitudes, a more amplified upper-level pattern, and a general northward shift in the jet stream. More frequent extreme summer heat events over mid-latitude continents are linked with reduced sea ice and snow through these circulation changes.

Arctic Warming Drives More Extreme Summer Heat Waves, Droughts And Deluges, Study Finds | ThinkProgress

 

[skookerasbil]

But you are pwned over on DRUDGE right now s0n!!!!

sorry

 

[skookerasbil]

coldest temp ever recorded -135.8°


coldest temp ever recorded -135.8°


coldest temp ever recorded -135.8°

 

[CrusaderFrank]

So the Warming that wasn't eaten by the Pacific Ocean ate the crysophere?

 

[skookerasbil]

Hey Frank........I'll spike the football for both of us!!!








I love the shit these meatheads come up with........its like putting a big old pumpkin on a tee and we get to grab the big bat and bash, bash, bash.

 

[CrusaderFrank]

Hey Frank........I'll spike the football for both of us!!!








I love the shit these meatheads come up with........its like putting a big old pumpkin on a tee and we get to grab the big bat and bash, bash, bash.

The record low is BECAUSE of AGW...yeah, that's the ticket

 

[TakeAStepBack]

Role for Eurasian Arctic shelf sea ice in a secularly varying hemispheric climate signal during the 20th century - Online First - Springer

Role for Eurasian Arctic shelf sea ice in a secularly varying hemispheric climate signal during the 20th century

Abstract
A hypothesized low-frequency climate signal propagating across the Northern Hemisphere through a network of synchronized climate indices was identified in previous analyses of instrumental and proxy data. The tempo of signal propagation is rationalized in terms of the multidecadal component of Atlantic Ocean variability—the Atlantic Multidecadal Oscillation. Through multivariate statistical analysis of an expanded database, we further investigate this hypothesized signal to elucidate propagation dynamics. The Eurasian Arctic Shelf-Sea Region, where sea ice is uniquely exposed to open ocean in the Northern Hemisphere, emerges as a strong contender for generating and sustaining propagation of the hemispheric signal. Ocean-ice-atmosphere coupling spawns a sequence of positive and negative feedbacks that convey persistence and quasi-oscillatory features to the signal. Further stabilizing the system are anomalies of co-varying Pacific-centered atmospheric circulations. Indirectly related to dynamics in the Eurasian Arctic, these anomalies appear to negatively feed back onto the Atlantic‘s freshwater balance. Earth’s rotational rate and other proxies encode traces of this signal as it makes its way across the Northern Hemisphere.


In similar fashion, a number of cycles in the temperature of air and oceans, and the level of Arctic ice, take place across the Northern hemisphere over decades. Curry and Wyatt say there is evidence of this going back at least 300 years.

According to Curry and Wyatt, the theory may explain both the warming pause and why the computer models did not forecast it.

It also means that a large proportion of the warming that did occur in the years before the pause was due not to greenhouse gas emissions, but to the same cyclical wave.

‘The stadium wave signal predicts that the current pause in global warming could extend into the 2030s,’ said Wyatt. This is in sharp contrast with the IPCC’s report, which predicts warming of between 0.3 and 0.7C by 2035.

Wyatt added: ‘The stadium wave forecasts that sea ice will recover from its recent minimum.’ The record low seen in 2012, followed by the large increase in 2013, is consistent with the theory, she said.

Even IPCC report co-authors such as Dr Hawkins admit some of the models are ‘too hot’.

He said: ‘The upper end of the latest climate model projections is inconsistent’ with observed temperatures, though he added even the lower predictions could have ‘negative impacts’ if true.

But if the pause lasted another ten years, and there were no large volcanic eruptions, ‘then global surface temperatures would be outside the IPCC’s indicative likely range’.

Professor Curry went much further. ‘The growing divergence between climate model simulations and observations raises the prospect that climate models are inadequate in fundamental ways,’ she said.

If the pause continued, this would suggest that the models were not ‘fit for purpose’.



Read more: http://www.dailymail...l#ixzz2mhdN5JOQ
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[Kosh]

Well I guess the OP can never use this saying again:

Weather does not equal climate.

 

[ScienceRocks]

But you are pwned over on DRUDGE right now s0n!!!!

sorry

I'll take a major scientific research paper over drudge some idiot that jacks off for a living.

 

[ScienceRocks]

Well I guess the OP can never use this saying again:

Weather does not equal climate.

Over decades it can charge the patterns of jet streams and how many warm or cold days we have.

 

[ScienceRocks]

coldest temp ever recorded -135.8°


coldest temp ever recorded -135.8°


coldest temp ever recorded -135.8°

Imagine 3 thermometers over the entire united states. Would we have much idea how cold it can get??? The answer is no. We probably have been -140+ within the past 100 years.

I'd like to see more buoys, temperature devices and satellite measurements. You on the right of course wants to cut that.

 

[ScienceRocks]

I'll stick with real science. Thank you.

 

[Politico]

Or at least copy and paste.

 

[Kosh]

Well I guess the OP can never use this saying again:

Weather does not equal climate.

Over decades it can charge the patterns of jet streams and how many warm or cold days we have.

So in other words you are promoting AGW propaganda over science.