Home » Columns »Sustainable Planet » Currently Reading:

Arctic Amplification

April 17, 2012 by Tony Noerpel filed under Columns, Sustainable Planet 2 Comments
noerpel150

The weather during the last decade has become increasingly weird and extreme. The occurrence of persistent weather events such as droughts, floods, heat waves and cold spells is increasing. The evidence that the most extreme events are linked to human-caused global warming is compelling. NASA climate scientists James Hansen, Makiko Sato and Reto Ruedy write [1] “we can state with a high degree of confidence that extreme summers, such as those in Texas and Oklahoma in 2011 and Moscow in 2010, are a consequence of global warming, because global warming has dramatically increased their likelihood of occurrence.” This is also the conclusion of several other peer-reviewed scientific journal articles [2]. Such sentiment is also being reported in the main stream media for example by Alexandra Steel on CNN [3]. Even television meteorologists such as Stu Ostro a Senior Meteorologist on The Weather Channel who were recently deniers have come around to this view [4].

Figure 1. Frequency of occurrence of local temperature anomalies in units of the local standard deviation. Anomalies are relative to the 1951-1980 base period. Source Hansen et al.

Figure 1 from the Hansen paper, shows the northern hemisphere summer temperature anomaly in standard deviations [5] from the mean 1951 to 1980 temperature. The summer temperatures are normally distributed. One standard deviation is exceeded 15.8 percent of the time in one of the two directions. Two standard deviations are exceeded only 2.3 percent of the time. Three standard deviations are exceeded only 0.13 percent of the time. The probability of exceeding four standard deviations is less than 0.003 percent and the probability of exceeding five standard deviations is less than 0.00003 percent of the time. Note that the distribution functions are getting broader with time, which means there will be more extremes and relative to the decade between 1951 and 1961, the mean temperature is getting warmer. Together, this means that warm temperatures will be set much more frequently than cold temperatures. In fact there is now a 10 percent probability that the summer temperature will exceed a value which in the 1950’s had less than a 0.13 percent chance of happening (greater than three standard deviations). Hansen et al write “Recent examples of summer temperature anomalies exceeding +3? [standard deviations] include the heat wave and drought in Oklahoma, Texas and Mexico in 2011 and a larger region encompassing much of the Middle East, Western Asia and Eastern Europe, including Moscow, in 2010.”

Identifying the strong correlation between extreme weather and global warming is not nearly as satisfying to the skeptical mind as understanding the physics that explains the correlation. The most obvious physical explanation is that in a warmer world there is more energy in the atmosphere, in the oceans and on the surface of the terrestrial earth and more energy will naturally fuel more energetic weather. Hurricanes have always been associated with high sea surface temperatures.

Another interesting phenomenon is polar amplification or more accurately arctic amplification. The poles tend to warm (or cool) faster than the tropics and temperate zones. When Svante Arrhenius first described the potential for human-caused global warming in 1896, he identified this feature of climate change [6]. While the earth has warmed one degree in the last 40 years, the arctic has warmed more than two degrees. There are several explanations for this. The most important and most obvious reason is the change in surface albedo in the arctic and sub-arctic [7]. The snow and ice reflect most of the incoming short wave solar energy back out into space while the dark ocean and land which are replacing it absorb most of this energy and as a consequence heat up. In the last three decades the arctic sea ice has declined by 40 percent. For a good illustration of the difference in albedo around Lake Superior, see figure 2 below from Jeff Master’s weather underground web site [8]. Note the difference between a cold winter with lots of snow and ice and a relatively warm dry winter with no snow and ice.

In a recent paper appearing in a March 2012 issue of Geophysical Research Letters, Jennifer Francis of Rutgers University and Stephen Vavrus of the University of Wisconsin explain [9] that arctic amplification causes the west-to-east winds of the jet stream, the river of wind separating the warm temperate climate to the south from the frigid arctic climate to the north, to slow. In fact the jet stream’s west winds around the northern hemisphere have slowed about 14 percent since 1980. They write that, “the differential warming of the Arctic relative to midlatitudes is the key linking AA [Arctic Amplification] with patterns favoring persistent weather conditions in mid-latitudes.” And, “Slower progression of upper-level waves causes more persistent weather conditions that can increase the likelihood of certain types of extreme weather, such as drought, prolonged precipitation, cold spells, and heat waves.”

The jet stream flow of air follows a serpentine path as it drifts north and south between about 30 degrees and 60 degrees latitude. The southward dips are called troughs and the northern peaks are called ridges. This phenomenon is shown in Figure 3 below. The slower eastward migration of waves in the jet stream causes weather to stall, favoring persistent conditions that can lead to extreme weather if they last a long time. The south winds behind the ridges pull tropical humid warm air northward, while north winds behind the troughs pull arctic air south. As shown in Figure 3, the ridges are occurring further north, which slows down the wave progression even more.

Francis and Vavrus conclude: “As the Arctic sea-ice cover continues to disappear and the snow cover melts ever earlier over vast regions of Eurasia and North America, it is expected that large-scale circulation patterns throughout the northern hemisphere will become increasingly influenced by Arctic Amplification. Gradual warming of the globe may not be noticed by most, but everyone – either directly or indirectly – will be affected to some degree by changes in the frequency and intensity of extreme weather events as greenhouse gases continue to accumulate in the atmosphere.”

The slowing of waves in the jet stream may explain both persistent cold events, such as the 2009/2010 winter over the eastern United States, as well as persistent droughts and heat waves such as over Texas and Oklahoma during 2011. Francis has written a more accessible explanation on the Yale Environment 360 web site [10]. I asked Dr. Francis in an e-mail if climatologists expect this trend to continue and she responded: “Our results suggest that the enhanced warming in the Arctic relative to the rest of the globe is causing our weather patterns to move more slowly. This means that the types of extreme weather that are caused by prolonged weather conditions — such as droughts, cold spells, heat waves, and floods — are becoming more likely. This tendency is expected to continue as greenhouse gases accumulate in the atmosphere and as additional sea ice is lost.”

I also asked if accumulation of atmospheric carbon dioxide would have a more pronounced impact on polar climate than global climate. My observation was that carbon dioxide and water vapor absorb long wave heat radiation at some of the same wavelengths thus blunting a bit the impact of additional carbon dioxide. But the arctic being cold has very little water vapor so the impact of an increase in carbon dioxide is much stronger than in the temperate zones. Dr. Francis confirmed this hypothesis and sent me a paper describing just this phenomenon [11].

Figure 3. Region of study: 140oW to 0o. Schematic of ridge elongation (dashed vs. solid) in upper-level heights caused by enhanced warming in Arctic relative to mid-latitudes. Higher amplitude waves progress eastward more slowly, as indicated by arrows. Source: Francis and Vavrus.

Figure 2. A tale of two winters: Lake Superior was choked with ice at the end of the winter of 2008 – 2009 (top), but was virtually ice-free at the end of the winter of 2011 – 2012 (bottom.) Image credit: NASA. Source: Jeff Masters.

[1] James Hansen, Makiko Sato and Reto Ruedy, “Perceptions of Climate Change: The New Climate Dice”, submitted to Proceedings of the National Academy of Sciences http://www.columbia.edu/~jeh1/mailings/2012/20120105_PerceptionsAndDice.pdf

[2] That the recent extreme heat events are caused by anthropogenic global warming is in fact the conclusion of a PNAS paper by Stefan Rahmstorf and Dim Coumou http://www.pnas.org/content/early/2011/10/18/1101766108.abstract That the Moscow drought was caused by global warming is the conclusion of yet another recently published paper in The Geophysical Research Letters http://www.agu.org/news/press/pr_archives/2012/2012-10.shtml. That the droughts in the Mediterranean region are a result of climate change has been reported by NOAA scientists in the journal Climate Change http://www.noaanews.noaa.gov/stories2011/20111027_drought.html .

[3] http://dailycaller.com/2012/04/03/cnn-meteorologist-todays-tornadoes-are-climate-change-we-are-seeing/#ixzz1r5BqMMUl

[4] Stu Ostro, Senior Meteorologist, The Weather Channel see http://climatecrocks.com/2010/12/03/stu-ostro-the-weather-channels-former-skeptic/ by the way, in this video, Ostro, in my opinion misuses the word skeptic. Skepticism is indeed a healthy part of science but it requires one to question everything, not simply that with which one disagrees. Deniers do not do this because no denier argument can stand even the weakest scrutiny. A real skeptic frames her skepticism as a testable counter hypothesis and being testable requires that a real skeptic is willing to be wrong as pointed out by Gabrielle Walker in her book Snowball Earth. For another recent convert see http://thinkprogress.org/romm/2012/03/29/454476/a-message-from-a-republican-meteorologist-on-climate-change/

[5] http://en.wikipedia.org/wiki/Standard_deviation

[6] Svante Arrhenius, “On the Influence of Carbonic Acid in the Air upon the Temperature of the Ground”, Philosophical Magazine and Journal of Science, Series 5, Volume 41, April 1896, pages 237-276. http://www.rsc.org/images/Arrhenius1896_tcm18-173546.pdf

[7] http://www.skepticalscience.com/kick-in-the-ice.html

[8] Jeff Masters, http://www.wunderground.com/blog/JeffMasters/show.html

[9] Francis, J. A. and S. J. Vavrus, “Evidence linking Arctic amplification to extreme weather in mid-latitudes, Geophysical Research Letters, Vol. 39, March, 2012.

[10] http://e360.yale.edu/feature/linking_weird_weather_to_rapid_warming_of_the_arctic/2501/

[11] V. A. Alexeev, P. L. Langen, J. R. Bates, Polar ampli?cation of surface warming on an aquaplanet in ‘‘ghost forcing’’ experiments without sea ice feedbacks, Climate Dynamics (2005), DOI 10.1007/s00382-005-0018-3

2 comments

  1. klem says:

    All of this makes me ask, How long must climate alarmists observe normal climate variability before they will finally admit they have been observing normal climate variability?

    • Tony Noerpel says:

      Hi klem

      That you for reading my article and taking the time to ask a question. As my next article has soon relevant information, I’ve attached my answer to the end of “Global Warming discovered – Again”.

      Best regards

      Tony

Comment on this article


By commenting, you agree to abide by our Terms of Service.


 

 

 

 

 

 

Columns

The Holocene Climate

noerpel_new

(Public Input Loudoun County Board of Supervisors, 7 March, 2017) Figure 1 shows the climate variation over the last million years. The low points on the curve correspond to ice ages when glaciers up to a mile thick covered New …

Choosing To Forgive

moore-sobelnewmug

By Samuel Moore-Sobel “Truly forgiving is the ability to say, ‘Thank you for giving me that experience.’” James Arthur Ray vaulted into fame on the Oprah Winfrey Show back in the mid-2000’s. Stunned hearing these words while watching The Rise and …

Five Key Retirement Questions

Smith0035

Beyond asking yourself where you see yourself and even what your lifelong goal are, effective retirement and longevity planning begs some very big questions. Review the points below and consider how housing, transportation and health considerations all play a role …

Work Woes

drmikenewpic

By Michael Oberschneider, Psy.D. Dr. Mike, I’m a manager at a large tech company and my boss has directed me to fire someone on my team, but as a Christian, I just can’t do it. It’s true that the employee …

Joy or Suffering

Lunde new

By Mary Rose Lunde No one likes to suffer. When given the chance, many people would choose to laugh rather than cry, to sit in silence with their friends rather than talk through their feelings, because not even their friends …

Wage Radio

wage

I will always remember – very fondly – the first time I ever set foot on the property at 711 Wage Drive Southwest in Leesburg, Virginia. It was a warm, sunny July morning in 1997, and I’d driven all the …

Speaking Truth to Power

noerpel_new

“With public sentiment nothing can fail. Without it nothing can succeed.” Abraham Lincoln On Thursday evening, February 23, I requested the Board of Supervisors pass a proclamation resolving to support the March for Science on Earth Day, April 22 [1]. …

Student News

Congratulations, Class of 2016

6 Jul 2016

grads_woodgrove

Woodgrove High School’s Class Of 2016 Graduation – By Amanda Clark On June 16, Woodgrove’s Class of 2016 was the 5th graduating class to walk the stage and accept their diploma. The ceremony was filled with anticipation as the chorus, …

(Be the first to comment)

Buckland Earns Degree In Medicine

6 Jul 2016

buckland

Molly Buckland, D.O., graduated from the West Virginia School of Osteopathic Medicine with a degree of Doctor of Osteopathic Medicine on May 28. While at WVSOM, Dr. Buckland received the Dr. Roland P. Sharp President’s Award and the James R. …

(Be the first to comment)

Adams Promoted To Lieutenant

6 Jul 2016

adamspromoted

Lt. James Adams, from Sterling and a Potomac Falls Halls Graduate, earned the promotion to the rank of Lieutenant. Adams is a Navy Week and Executive Outreach Planner for the Navy Office of Community Outreach in Millington, Tennessee. U.S. Navy …

(Be the first to comment)

Calendar

March 2017
Monday Tuesday Wednesday Thursday Friday Saturday Sunday
February 27, 2017 February 28, 2017 March 1, 2017 March 2, 2017 March 3, 2017

LAST HAM STANDING COMEDY IMPROV

LAST HAM STANDING COMEDY IMPROV
March 4, 2017

Notaviva Vineyards - Bluegrass Jam - FREE event

Notaviva Vineyards - Bluegrass Jam - FREE event
March 5, 2017
March 6, 2017 March 7, 2017 March 8, 2017 March 9, 2017 March 10, 2017 March 11, 2017 March 12, 2017
March 13, 2017 March 14, 2017 March 15, 2017 March 16, 2017 March 17, 2017 March 18, 2017

Wine & Chili Weekend

Wine & Chili Weekend
March 19, 2017

Joshua Carr River Safety Foundation Rummage Sale

Joshua Carr River Safety Foundation Rummage Sale
March 20, 2017 March 21, 2017 March 22, 2017 March 23, 2017 March 24, 2017

March Fourth Friday

March Fourth Friday
March 25, 2017 March 26, 2017

Spring Brunch

Spring Brunch

Spring Brunch

Spring Brunch
March 27, 2017 March 28, 2017 March 29, 2017 March 30, 2017 March 31, 2017 April 1, 2017

”Homage to Mother Earth”

”Homage to Mother Earth”

Nebbiolo Vertical Tasting

Nebbiolo Vertical Tasting

Notaviva Vineyards - Bluegrass Jam - FREE event

Notaviva Vineyards - Bluegrass Jam - FREE event
April 2, 2017

”Homage to Mother Earth”

”Homage to Mother Earth”

GALLERY COFFEEHOUSE: Readers Theater, “One Slight Hitch”

GALLERY COFFEEHOUSE: Readers Theater, “One Slight Hitch”
Current Print Issue:
Sign up for our email newsletter:

Recent Comments

  • David on Protecting Free Speech: Constitutionally protected speech is exactly what it sounds like, protected. We all have the legal right to utter nonsensical and...
  • Martha on Protecting Free Speech: Free speech is not a cherished right at the not-quite accredited Patrick Henry College, a religious school that Del. LaRock...
  • Martha Polkey on First Look at Envision Loudoun Results: It remains to be seen whether the direction citizens have provided to the Envision process is actually incorporated into the...
  • David on Protecting Free Speech: Mr. LaRock, I assume that the only reason you weren’t at every School Board meeting in 2005 passionately defending the...
  • LongTimePville on Purcellville Emergency Meeting Postponed to March 10: I bet Kelli Grim flip flops on her conflicts of interest and transparency campaign she ran on and does not...

Steady and NoBull

Lifestyle

Loudoun Workforce Resource Center Presents STEM Career Fair March 28

16 Mar 2017

Illustration of STEM education word typography design in orange theme with icon ornament elements

Anyone interested in a career in the rapidly growing field of STEM (Science, Technology, Engineering and Math) is encouraged to attend an upcoming STEM Career Fair in Loudoun. The Loudoun Workforce Resource Center, in partnership with Northern Virginia Community College (NVCC)’s Loudoun campus and NOVA SySTEMic Solutions, is holding a STEM Career Fair Tuesday, March 28, from 1:00 to 4:00 …

(Be the first to comment)

Keep Loudoun Beautiful—Greater Lovettsville Area Volunteers Needed

16 Mar 2017

Lovettsville Boat Launch 7-26-09

The Keep Loudoun Beautiful spring clean-up takes place the entire month of April and greater Lovettsville needs volunteers. Bags, vests, gloves and grabbers are available at the Lovettsville Community Center during normal business hours, Monday-Friday. This is a great group or individual activity that can be scheduled around your availability. E-mail Lovettsville Area Leader, Laura Lieberman, for details and to …

(Be the first to comment)

National Awkward Moments Day

8 Mar 2017

awkward

?Laughing at Yourself Is the Best Medicine No one knows who invented National Awkward Moments Day, Saturday, March 18. That’s no surprise, since it probably came about as the result of one stunningly awkward moment that the owner of that moment was hoping to forget. We surveyed our readers and friends to ask them about their most awkward moments, sharing …

(Be the first to comment)

Around Virginia

Protecting Free Speech

Dave_larock

By Dave LaRock (R-33) As elected officials and members of the legislature, our most fundamental responsibility is to protect God-given constitutionally protected rights. The First Amendment of the United States Constitution prohibits the government, including governmental public colleges and universities, from infringing on free speech and the free exercise of …

(3 comments)

Walbridge To Run for State Delegate in the 33rd District

Tia walbridge

Tia Walbridge announces her run for the District 33 seat in the Virginia House of Delegates. Walbridge is a wife and mother of two daughters and an active member of the Round Hill community. “Like many people in our district, my family has found its prosperity in a Virginia-based small …

(Be the first to comment)

Office Building on Capitol Square To Be Named After Civil Rights Pioneer Barbara Johns

image002

Governor Terry McAuliffe announced that the newly renovated state building located at 202 N. 9th Street on Capitol Square in Richmond (currently known as the 9th Street Office Building) will bear the name of civil rights pioneer Barbara Johns. The building, which reopened last year, houses the Virginia Attorney General’s …

(Be the first to comment)

Sports

Vikings Runner-Up at the State Championship 

8 Mar 2017

vikings

The Loudoun Valley Vikings are the boy’s runner-up at the VHSL 4A State Indoor Track and Field Championships at Roanoke College.  During the 2015-2016 school year, the Loudoun County School Board approved Indoor Track and Field as a Tier 2 (self-funded) sport.  The seven boys competing scored 48 points, second …

(Be the first to comment)

WLVBC U14 Boys Finish 3rd at VA Beach Event

23 Feb 2017

WLVBC300

The Western Loudoun Volleyball Club’s U14 Boys Team garnered 3rd place in their first travel tournament of 2017, the Virginia Beach Invitational. This event was held Feb. 18-19 and featured more than 24 teams from the U14 to U18 age group. The team was second on their net on day …

(Be the first to comment)

Archives

  • +2017
  • +2016
  • +2015
  • +2014
  • +2013
  • +2012
  • +2011
  • +2010
  • +2009