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AGW forced climate change is not up for debate.
spɹɐʍoɔ snoɯʎuouɐ
Vocem sine nomine audivit!
User ID: 1337
01-17-2018 05:47 PM

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Post: #91
RE: AGW forced climate change is not up for debate.
Advertisement

Alaska crushes record for hottest December as Arctic sea ice hits record low

"We are the U.S.'s canary in that coal mine."


[Image: DTrN0IhUQAAMlsU.jpg]

https://thinkprogress.org/alaska-hottest...effce0ad1/

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spɹɐʍoɔ snoɯʎuouɐ
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User ID: 1337
01-17-2018 06:27 PM

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Post: #92
RE: AGW forced climate change is not up for debate.
spɹɐʍoɔ snoɯʎuouɐ  Wrote: (01-15-2018 07:09 AM)
Recent enhanced high-summer North Atlantic Jet variability emerges from three-century context

Quote:The position and strength of the Northern Hemisphere polar jet stream are important modulators of mid-latitude weather extremes1 and their societal, ecosystem, and economic impacts2. In Europe, the position of the North Atlantic Jet (NAJ) drives temperature and precipitation extremes3,4 by controlling the location of the Atlantic storm track and by influencing the occurrence and duration of near-stationary atmospheric pressure fields (“atmospheric blocking”). The NAJ is strongest in winter5, but also influences European climate in summer, the season that is most commonly recorded in tree rings as climate proxies. In summer, a southern NAJ regime is associated with a decrease in blocking frequency over the British Isles (BRIT) and northwestern Europe that can result in floods in these regions6. In the northeastern Mediterranean (NEMED), on the other hand, the southern NAJ regime phase increases blocking frequency as well as the odds of heatwaves3. Such conditions occurred during the summer of 2007, when BRIT experienced the second wettest summer on record since 19127, whereas record-breaking high temperatures—with departures from the seasonal means exceeding 4 °C in some areas8—were observed across NEMED that led to excess human mortality and prompted catastrophic wildfires9. In contrast, the summer of 1976—when the NAJ was in an anomalously northward position and blocking patterns were reversed—was one of the driest and hottest summers on record in BRIT, but was associated with a NEMED cold extreme10. General circulation models (GCMs) systematically overestimate the seasonal cycle in the NAJ latitudinal position about the mean, with the majority of simulations showing a poleward bias in summer NAJ position compared to observational records11,12. GCM simulations largely agree, however, in their projection of the mean position of the mid-latitude jet stream to shift poleward in future climates with increased anthropogenic forcing11 and this result is particularly robust for the NAJ and for the summer season13,14.

An exceptional number of mid-latitude extreme weather events over the last decade has encouraged a suite of observational and modeling studies investigating the relative role of anthropogenic climate forcing and natural variability in driving this recent increase in weather extremes2,4,15. One hypothesis suggests variability in the amplitude and speed of the Northern Hemisphere jet stream as a potential mechanism linking recent mid-latitude weather extremes to anthropogenic warming16,17,18. This hypothesis is largely based on statistical associations between observational or atmospheric reanalysis data that are supported by plausible physical mechanisms. However, the data sets most frequently used provide relatively short time series (1979–present for the satellite era, 1948–present for the reanalysis era) that do not warrant robust results from a statistical significance perspective and that hamper the detection of non-linear relationships in a complex climate system19. Long-term records of jet stream variability are thus needed to put recent trends in a historical perspective and to investigate non-linear relationships between jet stream variability, mid-latitude extreme weather events, and anthropogenic climate change17,18.

Here we reconstruct interannual variability in the latitudinal position of the August NAJ back to 1725 CE by combining two summer temperature-sensitive tree-ring records. We find that extreme weather events—including floods, heatwaves, and wildfires—in BRIT and NEMED over the past 300 years have been linked to August NAJ anomalies. Our NAJ reconstruction shows that late twentieth century NAJ positions fall within the range of the preceding centuries, but that a recent increase in the number of NAJ anomalies is unprecedented. This increase in NAJ variance coincides with enhanced variance in the Pacific Basin and points to an increase in interannual meridional jet stream variability since the 1960s.

more:
https://www.nature.com/articles/s41467-017-02699-3

spɹɐʍoɔ snoɯʎuouɐ  Wrote: (01-17-2018 04:47 PM)



https://www.yaleclimateconnections.org/2...e-context/

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spɹɐʍoɔ snoɯʎuouɐ
Vocem sine nomine audivit!
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Today 07:07 AM

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Post: #93
RE: AGW forced climate change is not up for debate.
Australia’s Hot Ocean Blob Fuels Record Heat, Extreme Weather, Risk to Coral Reefs

Between Australia and New Zealand there’s a kind of climate change fed thing on the prowl in the off-shore waters. It takes the form of an angry layer of far warmer than normal surface water. And it’s been lurking around since late November.
[Image: hot-blob-australia.png?w=768&h=447]
(A hot, angry blob of much warmer than normal ocean temperatures has erupted between Australia and New Zealand.)


We can see this disruptive beast pretty clearly in the sea surface temperature anomaly maps provided by Earth Nullschool. Today’s readings show temperatures in this new blob hitting between 3.5 and 4.2 degrees Celsius above average across a broad expanse of ocean.

That’s much, much warmer than normal for this region of water. A place where 2 degree above average sea surface readings would tend to be unusual. But with global temperatures now hitting between 1.1 and 1.2 C above 1880s averages, we’re starting to see the climate dice more loaded for these kinds of extreme events. To be clear, this is not the kind of extremity we’d experience in a world at 2 C warming, or 4 C warming, or 7 C warming. But we’ve moved up the scale and weather, temperature, and ocean environmental conditions are being harmfully impacted.

more:
https://robertscribbler.com/2017/12/21/a...ral-reefs/
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spɹɐʍoɔ snoɯʎuouɐ
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Today 09:13 AM

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Post: #94
RE: AGW forced climate change is not up for debate.
[Image: DT2XYzoU8AANR4z.jpg]
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Today 09:41 AM

 



Post: #95
RE: AGW forced climate change is not up for debate.
spɹɐʍoɔ snoɯʎuouɐ  Wrote: (Today 09:13 AM)
[img=500x200]https://pbs.twimg.com/media/DT2XYzoU8AANR4z.jpg

Wow!

You coloured a bar code in with your new crayons you got for Christmas!
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spɹɐʍoɔ snoɯʎuouɐ
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Today 09:51 AM

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Post: #96
RE: AGW forced climate change is not up for debate.
LoP Guest  Wrote: (Today 09:41 AM)
spɹɐʍoɔ snoɯʎuouɐ  Wrote: (Today 09:13 AM)
[img=500x200]https://pbs.twimg.com/media/DT2XYzoU8AANR4z.jpg

Wow!

You coloured a bar code in with your new crayons you got for Christmas!

of course !

(there's a link in your quote you forget to snip)

chuckle
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spɹɐʍoɔ snoɯʎuouɐ
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Today 10:31 AM

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Post: #97
RE: AGW forced climate change is not up for debate.
Humans typically do our worst environmental damage in the places we live and work.

NOT now.

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LoP Guest
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Today 10:38 AM

 



Post: #98
RE: AGW forced climate change is not up for debate.
What's a non-verifiable conspiracy and why is AGW one of those?

Is there a null hypothesis?

Is that was AGW is called pseudo-science?
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spɹɐʍoɔ snoɯʎuouɐ
Vocem sine nomine audivit!
User ID: 1337
Today 10:42 AM

Posts: 649



Post: #99
RE: AGW forced climate change is not up for debate.
LoP Guest  Wrote: (Today 10:38 AM)
What's a non-verifiable conspiracy and why is AGW one of those?

Is there a null hypothesis?

Is that was AGW is called pseudo-science?

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