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More Evidence Global Surface Temperatures Poised To Rise Rapidly

temperature anomalies

Chart of global temperature since 1950 showing the phase of the El Niño-La Niña cycle. Via NASA.

A new study finds that when climate models factor in the temporary warming and cooling impact of El Niño and La Niña, they accurately predict recent global warming. And that is consistent with recent studies that led one climatologist to say, “Global temperatures look set to rise rapidly.”

GLOBAL WARMING CONTINUES TO ACCELERATE

A study last year found that global warming has accelerated in the past 15 years, especially in the ocean. As scientists had predicted, 90 percent of that warming ended up in the oceans. And we reported that Greenland’s ice melt increased five-fold since the mid-1990s. Another study that month found “sea level rising 60% faster than projected.”

And yet much of the media believes climate change isn’t what gets measured and reported by scientists, but is somehow a dialectic or a debate between scientists and deniers. So while 2010 was the hottest year on record and the 2000s the hottest decade on record, even prestigious media outlets like the New York Times keep pushing the meme that global warming has paused or inexplicably slowed down a great deal.

Back in December, researchers Cowtan and Way showed that much of the supposed slow down was due to missing data. As RealClimate explained in its post “Global Warming Since 1997 Underestimated by Half”:

A new study by British and Canadian researchers shows that the global temperature rise of the past 15 years has been greatly underestimated. The reason is the data gaps in the weather station network, especially in the Arctic. If you fill these data gaps using satellite measurements, the warming trend is more than doubled in the widely used HadCRUT4 data, and the much-discussed “warming pause” has virtually disappeared.

Cowtan and Way

The corrected data (bold lines) are shown compared to the uncorrected ones (thin lines). Via Real Climate.

“There are no permanent weather stations in the Arctic Ocean, the place on Earth that has been warming fastest,” as New Scientist explained five years ago. “The UK’s Hadley Centre record simply excludes this area, whereas the NASA version assumes its surface temperature is the same as that of the nearest land-based stations.” As I’ve discussed many times, that’s why we know with high certainty that the planet has actually warmed up more in the past decade than reported by the global temperature records, especially the Hadley Center’s.

ocean warmingSo there’s no “pause” in global warming, even for surface air temperatures. At that point, the remaining question was, why have surface temperatures slowed their growth, when ocean temperatures and glaciers and Arctic sea ice — which is where 95% of global warming ends up — have seen accelerated warming?

In February, new research offered an answer to that question. It found that the slowdown in the rate of surface warming is because trade winds have sped up in an unprecedented fashion, mixing more heat deeper into the oceans, while bringing cooler water up to the surface. Since more than 90 percent of human-induced planetary warming goes into the oceans, while only 2 percent goes into the atmosphere, small changes in ocean uptake can have huge impact on surface temperatures.

Lead author Prof. Matthew England explained in a news release:

“Scientists have long suspected that extra ocean heat uptake has slowed the rise of global average temperatures, but the mechanism behind the hiatus remained unclear…. But the heat uptake is by no means permanent: when the trade wind strength returns to normal –- as it inevitably will –- our research suggests heat will quickly accumulate in the atmosphere. So global temperatures look set to rise rapidly out of the hiatus, returning to the levels projected within as little as a decade.”

What that study found is that temperatures are likely to jump in the coming years since “the net effect of these anomalous winds is a cooling in the 2012 global average surface air temperature of 0.1–0.2°C.”

NEW STUDY VINDICATES CLIMATE MODELS

And that brings us to the new study published in Nature Climate Change, “Well-estimated global surface warming in climate projections selected for ENSO phase.” The El Niño-Southern oscillation (ENSO) is the cyclical warming and cooling of the central and eastern tropical Pacific, whose best known manifestations are El Niño and La Niña.

As the NASA chart at the top shows, over the short term ENSO can have a significant impact on global temperatures — and so it can impact the ability of even the latest climate models (so-called CMIP5 models) to accurately project temperatures over a period of 15 years or less.

In their abstract, the authors explain “Some studies and the IPCC Fifth Assessment Report suggest that the recent 15-year period (1998–2012) provides evidence that models are overestimating current temperature evolution.” But the authors note, “Such comparisons are not evidence against model trends because they represent only one realization where the decadal natural variability component of the model climate is generally not in phase with observations.”

Nino3.4Location_0The authors employed a clever way to figure out if the models were accurate or not. They took a great many simulations from 18 CMIP5 models. Then, as the UK Guardian explained, “looked at each 15-year period since the 1950s, and compared how accurately each model simulation had represented El Niño and La Niña conditions during those 15 years” – using the temperature trend in the Niño3.4 region, the key ENSO indicator.

In their study, the authors “present a more appropriate test of models where only those models with natural variability” that is “largely in phase with [ENSO] observations are selected from multi-model ensembles for comparison with observations. These tests show that climate models have provided good estimates of 15-year trends, including for recent periods and for Pacific spatial trend patterns.”

As the Guardian explains, “The study authors compared the simulations that were correctly synchronized with the ocean cycles (blue data in the left frame below) and the most out-of-sync (grey data in the right frame) to the observed global surface temperature changes (red) for each 15-year period” (using the corrected global temperature data from Cowtan and Way).

Nature Climate Change

Red: 15-year observed trends for each period. Blue: 15-year average trends from CMIP5 runs where the model Niño3.4 trend is close to observations. Grey: average 15-year trends for only the models with the worst correspondence to the Niño3.4 trend. The sizes of the dots are proportional to the number of models selected. From Nature Climate Change

Thus, the recent faux pause in the rise of surface air temperatures turns out to be nothing more than a modest slowdown driven by the short-term ENSO trend, which has favored the cooler La Niñas in the last few years (as the NASA figure at the top shows). As the Guardian points out, this conclusion “is supported by many recent studies finding that unprecedentedly strong Pacific trade winds have been churning the ocean and funneling more heat to the deeper layers, leaving less to warm the surface. All signs point to this being a temporary change, and once the oceans begin to switch back to more frequent El Niño conditions, we expect to see less efficient ocean heat absorption leading to accelerated warming of global surface temperatures.”

Finally, since the new study reconfirms that the latest climate models are indeed accurate (once ENSO is taken into account), that means if we continue on our path of general inaction on climate change, we face “9°F Warming For U.S., Faster Sea Rise, More Extreme Weather, Permafrost Collapse.” The time to act is now.

The post Faux Pause 3: More Evidence Global Surface Temperatures Poised To Rise Rapidly appeared first on ThinkProgress.

Joseph Romm's picture

Thank Joseph for the Post!

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Bas Gresnigt's picture
Bas Gresnigt on July 26, 2014

Thanks!

Good article giving an explanation for the failure of the climate models to explain the stable temperatures of past ~15years while the models predicted substantial rise.

Not clear why the expected sea level rise didn’t show, especially since most heat went into the sea so the water expanded.

 

Bob Bingham's picture
Bob Bingham on July 27, 2014

The last time the world had today’s level of 400 part per million of CO2 was four million years ago and the trees and plants at that time were adapted to the climate that went with it. Those trees had taken thousands or years to evolve to match those condition. The trees we have today are adapted to a CO2 level of 280 PPM and a climate 0.8C cooler and are rapidly going into conditions 2C warmer and with dramatical changed rainfall conditions of either drought or flood.
 We can expect to see much large numbers of trees and other plant life dying in the coming years and food production in my view will be almost impossible past 3C.  http://www.climateoutcome.kiwi.nz/climate-threats.html



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Hops Gegangen's picture
Hops Gegangen on July 28, 2014

 

What do you mean “the expected sea level rise didn’t show?” According to this article, and from what I understand, sea level has risen faster than generally expected.

What stable temperatures? But we just had the warmest May on record. The period from June 2009 to May 2010 was the warmest consecutive 12 months. And after the warmest La Nina years ever, the next serious El Nino will shatter the records of 17 years.

 

 

Joris van Dorp's picture
Joris van Dorp on July 28, 2014

Good article giving an explanation for the failure of the climate models to explain the stable temperatures of past ~15years while the models predicted substantial rise.”

Actually, the article explains that the temperatures of the past 15 years only seem to be stable, due in part to missing data but also due to anomalous and temporary(!) interactions between the ocean and the atmosphere. It seems you completely misunderstood the point of the article.

“Not clear why the expected sea level rise didn’t show, especially since most heat went into the sea so the water expanded.”

But the sea level rise did show, and it is far faster than predicted earlier, lending additional support to the conclusions from cliamte science that the planet is warming rapidly. Again, it seems you completely misunderstood the point of the article.

Joris van Dorp's picture
Joris van Dorp on July 28, 2014

Good article Mr. Romm.

Whenever you are not attacking nuclear power or over-hyping renewables you are able to provide excellent reading material.

Bas Gresnigt's picture
Bas Gresnigt on July 28, 2014

Seems you read other IPCC predictions regarding the Seal level rise than I did 10-15years ago.

Joris van Dorp's picture
Joris van Dorp on July 31, 2014

Sea levels have been rising faster than IPCC projections for a long time, many years. This really is basic knowledge. Can you prove that your statement is correct? Can you prove that sea-levels have been rising less than the IPCC has projected? If not, then why do you insist that you are right? What are you trying to achieve?

We analyse global temperature and sea-level data for the past few decades and compare them to projections published in the third and fourth assessment reports of the Intergovernmental Panel on Climate Change (IPCC). The results show that global temperature continues to increase in good agreement with the best estimates of the IPCC, especially if we account for the effects of short-term variability due to the El Niño/Southern Oscillation, volcanic activity and solar variability. The rate of sea-level rise of the past few decades, on the other hand, is greater than projected by the IPCC models. This suggests that IPCC sea-level projections for the future may also be biased low.”

http://iopscience.iop.org/1748-9326/7/4/044035/article

 

 

Bob Bingham's picture
Bob Bingham on July 31, 2014

The IPCC always has problems with ice melt and sea level rise. They only claim what they can actually prove and this is OK with the atmosphere and many other areas but the ice and sea are different. Comprehensive records for the sea only go backten years and even this only covers the near surface egions. The Arctic and Antarctic are also very poorly recorded because of lack of access. The scientists who work their make much bolder forecasts but lack definitive proof.

Bas Gresnigt's picture
Bas Gresnigt on July 31, 2014

Apparently I read exaggerating articles around sea level rise in the nineties.
Our ongoing dike reinforcements, also give the impression of a sea level that will be meters higher.

The first IPCC report predicted a rise of 6cm/decade with uncertainty boundaries of 3-10cm/decade.

It turns out that the sea level rise now follows the low boundary of 3cm/decade (=30cm/century).
So you are right.

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