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Three New Papers: Greenland 3-5°C Warmer With 40 Kilometers Less Ice Area 4,000-10,000 Years Ago

by Kenneth Richard
July 11, 2017, 10:28 AM
in News and Opinion
Reading Time: 5 mins read
A A
4

Greenland Cooling Since 2005

Arctic Region Cooler Now Than Most Of The Last 10,000 Years


It’s official. According to a new paper published in the journal Scientific Reports, Greenland has been cooling slightly since 2005.

This trend development may be a harbinger of what may be in store for the coming years.  Shifts in North Atlantic temperatures typically lead changes in the Arctic by a few years.  And throughout the North Atlantic, rapid cooling has been underway since 2005, plunging below the levels reached in the 1950s.

Kobashi et al., 2017

“For the most recent 10 years (2005 to 2015), apart from the anomalously warm year of 2010, mean annual temperatures at the Summit exhibit a slightly decreasing trend in accordance with northern North Atlantic-wide cooling.  The Summit temperatures are well correlated with southwest coastal records (Ilulissat, Kangerlussuaq, Nuuk, and Qaqortoq).”


A Few Thousand Years Ago, The Greenland/Arctic Region Was 3-5°C Warmer Than Now


Between 10,000 and 4,000 years ago, atmospheric CO2 concentrations were almost 150 ppm lower than they are now (~260 ppm).  Despite such low CO2 levels, the Arctic region was several degrees Celsius warmer than it has been in recent decades.   Arctic summers were likely sea ice-free during these much warmer years.


Mangerud and Svendsen, 2017

“Shallow marine molluscs that are today extinct close to Svalbard, because of the cold climate, are found in deposits there dating to the early Holocene. The most warmth-demanding species found, Zirfaea crispata, currently has a northern limit 1000 km farther south, indicating that August temperatures on Svalbard were 6°C warmer at around 10.2–9.2 cal. ka BP [10,200 to 9,200 years ago], when this species lived there. … After 8.2 cal. ka, the climate around Svalbard warmed again, and although it did not reach the same peak in temperatures as prior to 9 ka, it was nevertheless some 4°C warmer than present between 8.2 and 6 cal. ka BP. Thereafter, a gradual cooling brought temperatures to the present level at about 4.5 cal. ka BP. The warm early-Holocene climate around Svalbard was driven primarily by higher insolation and greater influx of warm Atlantic Water, but feedback processes further influenced the regional climate.”


Lasher et al., 2017

“This paper presents a multiproxy lake record of NW Greenland Holocene climate. … Summer temperatures (2.5–4 °C warmer than present) persisted until ∼4 ka [4,000 years ago] … Continual cooling after 4 ka led to coldest temperatures after 1.2 ka, with temperature anomalies 2-3°C below present.  Approximately 1000 km to the south, a 2-3°C July temperature anomaly (relative to [warmer than] present) between 6 and 5 ka [thousand years ago] was reported based upon chironomid assemblages near Illulisat and Jakobshavn (Axford et al., 2013). Across Baffin Bay on northeastern Baffin Island, HTM [Holocene Thermal Maximum] summer temperatures were an estimated ~5°C warmer than the pre-industrial late Holocene and 3.5°C warmer than present, based upon chironomid assemblages (Axford et al., 2009; Thomas et al., 2007).”


Kobashi et al., 2017

“After the 8.2 ka event, Greenland temperature reached the Holocene thermal maximum with the warmest decades occurring during the Holocene (2.9 ± 1.4 °C warmer than the recent decades [1988-2015]) at 7960 ± 30 years B.P.”


Lusas et al., 2017 (East Greenland)

“The lack of glacio-lacustrine sediments throughout most of the record suggests that the ice cap was similar to or smaller than present throughout most of the Holocene. This restricted ice extent suggests that climate was similar to or warmer than present, in keeping with other records from Greenland that indicate a warm early and middle Holocene. Middle Holocene magnetic susceptibility oscillations, with a ~200-year frequency in one of the lakes, may relate to solar influence on local catchment processes. … Air temperatures in Milne Land, west of our study area, based on preliminary estimates from chironomids, may have been 3–6°C warmer than at present (Axford et al. 2013), and in Scoresby Sund itself, warm ocean fauna, including Mytilus edulis and Chlamys islandica, both of which live far to the south today, occupied the fjords (Sugden and John 1965; Hjort and Funder 1974; Street 1977; Funder 1978; Bennike and Wagner 2013; Fig. 13).  … Recession of Istorvet ice cap in the last decade has revealed plant remains that show that the glacier was smaller than at present during the early stages of the Medieval Warm Period, but expanded during the late Holocene ca. AD 1150 (Lowell et al. 2013).”


No Net Warming For The Greenland Ice Sheet In 90 Years


Kobashi et al., 2017


Zhao et al., 2016


Hanna et al., 2011


Greenland Ice Sheet Had Retreated 20-60 Kilometers Behind Present Margins ~8,000 Years Ago


Lasher et al., 2017

“Following deglaciation, the GrIS [Greenland Ice Sheet] retreated behind its present margins (by as much as 20-60 km in some parts of Greenland) during the HTM [Holocene Thermal Maximum] (Larsen et al., 2015; Young and Briner, 2015).”


Briner et al., 2016

“The Greenland Ice Sheet retracted to its minimum extent between 5 and 3 ka [5,000 and 3,000 years ago], consistent with many sites from around Greenland depicting a switch from warm to cool conditions around that time.”

 


A Long-Term Context


Greenland has warmed 20-24 times the magnitude reached during the last century multiple times. During these abrupt warming events (10°C to 15°C temperature rise within decades), CO2 concentrations were stable and hovered below 200 parts per million. This indicates that the Arctic climate is not significantly influenced by CO2 variations nor human activity in general, as the past 100 years are well within the range of natural variability.

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Comments 4

  1. Spurwing Plover says:
    8 years ago

    Hey was’nt the North Pole(Arctic) suppost to be Ice Free by a certian year as Gore was babbling about and according to some nutcases England would either be a series of tiny islands or snow would be a rare thing and the whole earth would be like was shown in Kevin Kosners stinkeroo movie WATERWORLD where he plays a amphibious dork named MARINER where he swims dolphin style and makes himself a total baffoon

    • rakooi says:
      8 years ago

      Gore is not now, nor has he ever been a Scientist.
      He actually said that Some have said that AS EARLY as 2014, the Ice in the Arctic would melt during the Summers.
      Of the 70 or 80 Concerns expressed in his film An Inconvenient Truth,
      ALL but 9 were found to be ACCURATE and Scientifically Sound by a British Judge….Not exactly WHAT right wing PRO-Killer Coal functionaries had hoped for.

      They wanted to stop Gore’s right to express himself on Global Warming!

      Gore NEVER said the world would look like the stinky movie Waterworld. A truly dreadful show….to think I paid to see the dam thing.
      ..Temperatures are rising.
      .
      ..COUNTER TO EVERY Natural Cycle.
      .
      ( GOOGLE: Milankovitch Cycle )
      .
      Earth’s most powerful natural cycle > > > >OVERPOWERED by What?
      .
      We should be moving toward the next GLACIATION
      …but we ARE warming !

      INFRA RED HEAT RADIATION EMITTED from EARTH as a cooling mechanism,

      INTERACTS WITH Atmospheric Gases
      …that I.R. Heat is captured and redirected in all directions.
      …MUCH of it back at Earth…which ADDS TO the WARMING of our GLOBE.
      THIS IS MEASURED by a variety of
      Satellites,
      Digital Weather Balloons,
      With Ground Spectroscopic stations…..confirm all the details of this process.
      ..
      For THOUSANDS OF YEARS,
      the Lowly Pine Beetle was confined to the far Southern Latitudes by the severe cold up north.
      NOW,
      it is routine to find the PINE BEETLE well north of FAIRBANKS, ALASKA, and across N. Canada.
      Pine beetles are felling more trees than wildfires and the timber industry combined.
      .
      In some regions–Alaska, for example–warmer, longer summers …
      “We’re going to see a virtually complete loss of mature lodgepole pines in the state due to the Pine Beetle.

      The Winter In the Arctic is a land of perpetual NIGHT, NO sun to warm the Temperatures.
      so temps routinely are 20 Below-65 BELOW ZERO
      & no matter the time of day…ICE SHEETS Should be GROWING
      So
      Imagine the mid winter SHOCK:
      TEMPS in the NORTH polar regions have been ABOVE FREEZING !
      2nd year in a row…with 24 hour darkness……ABOVE FREEZING !
      How is that possible? Usually 20 Below Zero to 60 Below Zero !

      A Slushy Lake the size of TEXAS, 300,000 square miles…complete with Niagara-like Falls from Ice Field onto Salt Sea.
      Even a Rain Shower on the desert continent with an average temperature, historically, of 50 BELOW ZERO.

      THERE’S NO GLOBAL WARMING…..EVERYTHING IS JUST HUNKY DORY IN MY BACK YARD !
      *
      http://www.realclimate.org/images//Marcott.png

      America’s TV meteorologists: Symptoms of climate change are rampant, undeniable
      http://www.washingtonpost.com/…

      • Al Shelton says:
        8 years ago

        @RAKOOI..
        You need to reD THIS..
        http://principia-scientific.org/emissivity-debunks-climate-alarm/

  2. G says:
    8 years ago

    Shocking!
    Less ice in Greenland than 10,000 years ago!

    Hmmmm… Let’s talk about my back yard – literally. Just 11,000 years ago my property in Wisconsin was locked beneath a massive glacier. That’s a blink of an eye in geo-time.

    Do climates change? I’d say yes, based on this “slight shift”… Did the Koch Brothers, evil free markets, and fossil fuels cause my back yard to thaw? You tell me.

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