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Found 5 results

  1. A comparison of Arctic sea ice in July - 2019 vs 2012 - YouTube Presentation Presented By: Seemorerocks 97 Presentation Date: 23rd July, 2019 Abstract: None My Summary: Seemorerocks is a climate change protagonist and writes regular blogs under this name. This was his analysis of the very low summer 2019 Arctic sea ice extent with a "possibilty" of the 2012 record all time low being beaten. He does a comparison between 2012 and 2019 drawing on data from Zach Labe. He used the following sources: NASA "World View" satellite imagery (source: https://worldview.earthdata.nasa.gov/?v=-6690640.334728033,-3485696,6690640.334728033,3485696&p=arctic&t=2019-04-12-T00%3A00%3A00Z&l=VIIRS_SNPP_CorrectedReflectance_TrueColor(hidden),MODIS_Aqua_CorrectedReflectance_TrueColor(hidden),MODIS_Terra_CorrectedReflectance_TrueColor,Reference_Labels(hidden),Reference_Features(hidden),Coastlines ) US Navy NSIRCC site (source: https://www7320.nrlssc.navy.mil/GLBhycomcice1-12/arctic.html.) The 2012 "Great Arctic Cyclone" (source: https://en.wikipedia.org/wiki/Great_Arctic_Cyclone_of_2012) I have added several other papers and presentations to the portal on the August 2012 cyclone and on the 2012 Arctic profile more generally and more will follow shortly. For the sake of balance, most of the authors conclude that the cyclone was only one of a number of factors at play that produced the record minimum extent in 2012. Link to YouTube presentation (16 minutes): https://www.youtube.com/watch?v=7FjFgDKmdGMhttps://www.youtube.com/watch?v=7FjFgDKmdGM
  2. Impacts of the Record Arctic Sea Ice Minimum of 2012 - Presentation 93rd AMS Annual Conference: from 5th to 10th January, 2013 at Austin Convention centre Session 1 on 8th January, 2013: "Global Weather Impacts in 2012" Presenters: Mark C. Serreze Presentation Date (time): 8th January, 2013 (0915) Presentation Summary: On 16 September, 2012, Arctic sea ice extent dropped to the lowest level recorded over the satellite era, which at 3.49 million square km was 18% lower than the previous record low extent set in September 2007. The summer of 2007 featured unusually high sea level pressure centered north of the Beaufort Sea and Greenland, paired with unusually low pressure along northern Eurasia, bringing in warm southerly winds along the shores of the East Siberian and Chukchi seas, favoring strong ice melt in these sectors and pushing the ice away from the coast, leaving open water. The pressure pattern also favored the transport of ice out of the Arctic Ocean and into the North Atlantic through Fram Strait. By sharp contrast, apart from an unusually strong low pressure system in the first week of August centered over the northern Beaufort Sea, weather patterns during the summer of 2012 were unremarkable. While evaluations are ongoing as this abstract is written, it appears that in response to a warming Arctic over the past several decades, the spring ice cover is now so thin that large parts of the sea ice cover are now simply unable to survive the summer melt season. Through the summer of 2012, the Arctic Ocean absorbed a great deal of solar energy in dark open water areas. The release of this stored heat to the atmosphere during the autumn and winter, manifested as strong positive anomalies in surface and lower tropospheric temperatures, serves as an exclamation point on the ongoing process of Arctic amplification – the observed outsized rise in air temperatures over the Arctic compared to the globe as a whole. Whether this outsized warming will influence autumn and winter weather patterns beyond the Arctic region, as has been argued to have been the case in other recent years with low end-of-summer sea ice extent, remains to be seen. What is clear is that the events of 2012 have further raised awareness of the economic and strategic importance of the Arctic through its growing accessibility to marine shipping and extraction of natural resources. Link to full video presentation (15 minutes): https://ams.confex.com/ams/93Annual/flvgateway.cgi/id/24392?recordingid=24392&entry_password=777465&uniqueid=Paper224917 Link to the full conference agenda: https://ams.confex.com/ams/93Annual/webprogram/meeting.html
  3. The great Arctic cyclone of August 2012 Authors: Ian Simmonds and Irina Rudeva First Published: 15th December, 2012 Abstract: On 2 August 2012 a dramatic storm formed over Siberia, moved into the Arctic, and died in the Canadian Arctic Archipelago on 14 August. During its lifetime its central pressure dropped to 966 hPa, leading it to be dubbed ‘The Great Arctic Cyclone of August 2012’. This cyclone occurred during a period when the sea ice extent was on the way to reaching a new satellite‐era low, and its intense behavior was related to baroclinicity and a tropopause polar vortex. The pressure of the storm was the lowest of all Arctic August storms over our record starting in 1979, and the system was also the most extreme when a combination of key cyclone properties was considered. Even though, climatologically, summer is a ‘quiet’ time in the Arctic, when compared withall Arctic storms across the period it came in as the 13th most extreme storm, warranting the attribution of ‘Great’. Link to full paper: https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2012GL054259
  4. Extreme Arctic cyclone in August 2016 Authors: Akio Yamagami, Mio Matsueda and Hiroshi L. Tanaka First Published: 12th July, 2017 Abstract: An extremely strong Arctic cyclone (AC) developed in August 2016. The AC exhibited a minimum sea level pressure (SLP) of 967.2 hPa and covered the entire Pacific sector of the Arctic Ocean on 16 August. At this time, the AC was comparable to the strong AC observed in August 2012, in terms of horizontal extent, position, and intensity as measured by SLP. Two processes contributed to the explosive development of the AC: growth due to baroclinic instability, similar to extratropical cyclones, during the early phase of the development stage, and later nonlinear development via the merging of upper warm cores. The AC was maintained for more than 1 month through multiple mergings with cyclones both generated in the Arctic and migrating northward from lower latitudes, as a result of the high cyclone activity in summer 2016. Link to full paper: https://rmets.onlinelibrary.wiley.com/doi/10.1002/asl.757 Alternative pdf version: https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/asl.757
  5. On the 2012 record low Arctic sea ice cover: Combined impact of preconditioning and an August storm Authors: Claire L. Parkinson and Josefino C. Comiso First Published: 14th March, 2013 Abstract: A new record low Arctic sea ice extent for the satellite era, 3.4 × 106 km2, was reached on 13 September 2012; and a new record low sea ice area, 3.0 × 106 km2, was reached on the same date. Preconditioning through decades of overall ice reductions made the ice pack more vulnerable to a strong storm that entered the central Arctic in early August 2012. The storm caused the separation of an expanse of 0.4 × 106 km2 of ice that melted in total, while its removal left the main pack more exposed to wind and waves, facilitating the main pack's further decay. Future summer storms could lead to a further acceleration of the decline in the Arctic sea ice cover and should be carefully monitored. Link to full paper: https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/grl.50349 Alternative pdf version: https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1002/grl.50349
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