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Arctic Climate--Long-term Reconstructions

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Arctic Ocean may have been covered by an ice shelf nearly double the size of Greenland’s ice sheet. An ice shelf over a kilometre thick once formed over the Arctic Ocean, a new study by researchers from the University of Sheffield has revealed. The study is the first of its kind and strongly supports the theory that a floating ice shelf might have formed in the Arctic Ocean during some of the Earth’s Ice Ages.

An ice shelf over a kilometre thick once formed over the Arctic Ocean, a new study by researchers from the University of Sheffield has revealed. The research, led by Dr Ed Gasson, from the University of Sheffield’s Ice and Climate research group published today (17 April 2017) in Nature Communications, used a numerical ice sheet/shelf computer model to show that an ice shelf in the Arctic Basin could only have become a kilometre thick if it covered the entire basin. This model also provided an estimate of the ice shelf’s size – up to 1.7 times the size of Greenland’s current ice sheet.

The ice shelf most likely formed during the penultimate glacial period around 140,000 years ago. Inconvenient new study: Canadian Arctic had significantly warmer summers a few thousand years ago | Watts Up With That? From the melting sea ice and dead polar bears department comes this new study: Multiproxy paleoecological evidence of Holocene climatic changes on the Boothia Peninsula, Canadian Arctic Marie-Claude Fortin, Konrad Gajewski, Ottawa-Carleton Institute of Biology, Laboratory for Paleoclimatology and Climatology, University of Ottawa, Ottawa, ON K1N 6N5, Canada Received 20 September 2015, Available online 22 March 2016 doi:10.1016/j.yqres.2016.02.003 Abstract A study of chironomid remains in the sediments of Lake JR01 on the Boothia Peninsula in the central Canadian Arctic provides a high-resolution record of mean July air temperatures for the last 6.9 ka.

Mean July air temperatures inferred from the fossil chironomid assemblages based on the WAPLS 2-component model and using the modern calibration dataset of Fortin et al. (2015) show a long-term cooling over the record (Fig. 7). Like this: Like Loading... Arctic Was An Open Sea In The Year 1122 | The Deplorable Climate Science Blog. In the year 1122, people from several northern European countries travelled through open seas in the Arctic.

Papers Past | VARIATIONS IN CLIMATE. (Press, 1887-11-08) By contrast, the 1970’s were much colder with Iceland frozen in, global temperatures plummeting and scientists forecasting a new ice age. TIME Magazine Archive Article — Another Ice Age? — Jun. 24, 1974 The 1990 IPCC report showed this warmth in the 12th century, and recognized that temperatures then were much warmer than they are now. 1990 IPCC report chapter 7 Reality didn’t suit the needs of government or climate scientists who need funding, so the 2001 IPCC report contained Michael Mann’s nonsensical hockey stick graph which shows ice melting when it is cold, and ice freezing when it is warm. ‎www.meteo.psu.edu/holocene/public_html/shared/research/ONLINE-PREPRINTS/Millennium/mbh99.pdf The basis of modern climate science is complete garbage and fake news.

Long Term Arctic Temperature Trends | NOT A LOT OF PEOPLE KNOW THAT. By Paul Homewood As I pointed out in my post, Arctic Sea Ice Update, the other day, we currently have low sea ice extent and unusually high temperature anomalies in the Arctic. Although much of this is just weather, there is an underlying pattern of warming related to pulses of unusually warm water, which have been entering the Arctic Ocean from the Atlantic for the last decade or more.

But just how unusual are conditions there? Are they as unprecedented as Neven suggested in the comments? The area we are talking about spans from East Greenland across to Siberia. So what do the temperature trends tell us about the climate in that part of the world. Akureyri in Iceland is regarded as being the Icelandic site most representative of climate in the Greenland Sea, as it is on the north coast. I prepared this graph of annual mean temperatures a few months ago. The warmest year recently was 2014, with a mean of 5.3C. Like this: Alarmists Right On Schedule …. As predicted, climate experts have jumped into their next phase of nonsensical climate propaganda. There’s likely never been this little sea ice on the planet since human civilization began.Eric Holthaus Never mind the large increase in Arctic sea ice thickness and 10% increase in volume over the past decade.

Never mind that the Arctic was ice-free in the past “Examination of several proxy records (e.g., sediment cores) of sea ice indicate ice-free or near ice-free summer conditions for at least some time during the period of 15,000 to 5,000 years ago”– Walt Meier NSIDC Climate alarmists are as predictable as clockwork. New Paper Indicates There Is More Arctic Sea Ice Now Than For Nearly All Of The Last 10,000 Years. By Kenneth Richard on 2. March 2017 Solar Forcing Of Modern, Historic Arctic Sea Ice Only Slightly Less Sea Ice Now Than Little Ice Age In a new paper (Stein et al., 2017), scientists find that Arctic sea ice retreat and advance is modulated by variations in solar activity.

In addition, the sea ice cover during the last century has only slightly retreated from the extent reached during coldest centuries of the Little Ice Age (1600s to 1800s AD), which had the highest sea ice cover of the last 10,000 years and flirted with excursions into year-round sea ice. The Medieval Warm Period sea ice record (~900 to 1200 AD) had the lowest coverage since the Roman era ~2,000 years ago. Of note, the paper makes no reference to carbon dioxide or anthropogenic forcing as factors modulating Arctic sea ice. Stein et al., 2017 The causes that are controlling the decrease in sea ice are still under discussion.

Lessen and Thejll, 2005. 2 More New Papers Affirm There Is More Arctic Ice Coverage Today Than During The 1400s. Earlier this year, Stein et al., 2017 published a reconstruction of Arctic sea ice variations throughout the Holocene that appeared to establish that there is more Arctic sea ice now than for nearly all of the last 10,000 years. The study region, the Chukchi Sea, was deemed representative of most of the Arctic, as the authors asserted that “the increase in sea ice extent during the late Holocene seems to be a circum-Arctic phenomenon as PIP25-based sea ice records from the Fram Strait, Laptev Sea, East Siberian Sea and Chukchi Sea display a generally quite similar evolution, all coinciding with the decrease in solar radiation.” In 2014, Dr. Qinghua Ding and colleagues published a consequential paper in the journal Nature contending that much of the warming trend in the Arctic since 1979 can be traced to “unforced natural variability” rather than anthropogenic forcing.

Then, a few months ago, Dr. 1. 2. Moffa-Sánchez and Hall, 2017 (supplemental) Science debunks the “Arctic sea ice extent at its lowest for at least 1500 years” meme. These headlines have been recently making the rounds, such as this article at vox.com which describes “sudden scary ice melt in the Arctic, in three charts One of the charts is below, along with some peer reviewed science that says otherwise. By Paul Homewood h/t Andyg55 In December, NOAA released its latest annual Arctic Report Card, which analyzes the state of the frozen ocean at the top of our world. Overall, it’s not good. “The Arctic is going through the most unprecedented transition in human history,” Jeremy Mathis, director of NOAA’s Arctic research program, said at a press conference. “This year’s observations confirm that the Arctic shows no signs of returning to the reliably frozen state it was in just a decade ago.”

The report, which you can read in full here, compiles trends that scientists have been seeing for years. That huge drop-off at the end? Re-posted from No Tricks Zone: In 2014, Dr. Then, a few months ago, Dr. 1. 2. Read the full post here. Like this: Like Loading... “Arctic sea ice extent at its lowest for at least 1500 years”–Debunked By Three Scientific Papers. By Paul Homewood h/t Andyg55 Further to NOAA’s claim that Arctic sea ice extent is at its lowest for at least 1500 years, Kenneth Richard highlighted three studies last year that show the claim to be bunkum. Re-posted from No Tricks Zone: Earlier this year, Stein et al., 2017 published a reconstruction of Arctic sea ice variations throughout the Holocene that appeared to establish that there is more Arctic sea ice now than for nearly all of the last 10,000 years. The study region, the Chukchi Sea, was deemed representative of most of the Arctic, as the authors asserted that “the increase in sea ice extent during the late Holocene seems to be a circum-Arctic phenomenon as PIP25-based sea ice records from the Fram Strait, Laptev Sea, East Siberian Sea and Chukchi Sea display a generally quite similar evolution, all coinciding with the decrease in solar radiation.”

In 2014, Dr. 1. 2. Like this: Climate variability in the subarctic area for the last 2 millennia. Marie Nicolle1, Maxime Debret1, Nicolas Massei1, Christophe Colin2, Anne deVernal3, Dmitry Divine4,5, Johannes P. Werner6, Anne Hormes7, Atte Korhola8, and Hans W. Linderholm9 1Normandie Univ, UNIROUEN, UNICAEN, CNRS, M2C, 76000 Rouen, France 2GEOPS, CNRS, University of Paris-Sud, 91405 Orsay CEDEX, France 3Centre de recherche en géochimie et géodynamique (Geotop), Université du Québec à Montréal, Montréal, QC, Canada 4Norwegian Polar Institute, Tromsø, Norway 5Department of Mathematics and Statistics, Arctic University of Norway, Tromsø, Norway 6Bjerknes Center for Climate Research and Department of Earth Science, University of Bergen, Bergen, Norway 7University of Gothenburg, Department of Earth Sciences, Gothenburg, Sweden 8Department of Environmental Sciences, Environmental Change Research Unit (ECRU), University of Helsinki, P.O.

Box 65, 00014 Helsinki, Finland 9Regional Climate Group, Department of Earth Sciences, University of Gothenburg, 40530 Gothenburg, Sweden Abstract.