Artic Ice Error
Contents |
Nature | News Sharing Error discovered in Antarctic sea-ice record Misalignment in data between satellites may be fixed now, but went undetected for years. Mark Zastrow 22 July 2014 Article tools Rights & Permissions Peter Rejcek/National Science Foundation Antarctic sea ice what is sea ice extent extent has expanded since the 2000s. Rising temperatures have caused the amount of Arctic sea when is the arctic predicted to see open ocean ice to shrink dramatically since global observations began in the 1970s. But on the other side of the world, sea ice in Antarctica what impact has arctic warming has on walruses was at first steady — and then began to slowly expand in the mid-2000s. Some researchers now say that the Antarctic trend may have been inflated by an error in the decades-long record of satellite observations of Southern ice free arctic predictions Hemisphere sea ice1. Scientists process data from microwave-sensing satellites using one of two standard algorithms to distinguish bright sea ice from dark open water. Researchers led by Ian Eisenman, a climatologist at the Scripps Institution of Oceanography in San Diego, California, discovered a mismatch between an older and a newer version of the same NASA sea-ice data set that occurred when a satellite sensor was replaced in December 1991. Such “jumps” in data are caused by slight
What Is The Difference Between The Seasonal Patterns Of Arctic Ice In Comparison To Antarctic Ice?
differences in the satellites' sensitivity, and are usually corrected when scientists process the data collected by the probes. But the error that Eisenman identified — reported July 22 in The Cryosphere — wasn't obvious. He found it only by comparing an old version of the data set with a 2008 version, and says that the data were too noisy to tell which version had been mishandled. Gains and losses The finding raises two possibilities, Eisenman and his colleagues say. Either much of the recent mysterious growth trend is actually spurious, or the current figures are accurate but the trend could have been detected years earlier. The climate scientist who maintains the data set, Josefino Comiso of the NASA Goddard Space Flight Center in Greenbelt, Maryland, says he is confident that the current data set is correct. Comiso says that he inadvertently introduced a mistake into the record — known as Bootstrap — at some point after 1991, but corrected it unknowingly when he updated the file in 20082. Comiso and other climate scientists reject the suggestion that his data set may overestimate the recent trend in Antarctic sea-ice growth — by as much as two-thirds, according to Eisenman's analysis. Another NASA sea-ice data set, processed using the other standard algorithm, shows a growth trend similar to that in Comiso's current data. Paul Holland, an ocean modeller with the B
policy In Focus Explainers Factchecks Features Guest posts Infographics Interviews Media analysis Daily Brief MENU About
Has The Arctic Always Has Ice In The Summer
Us Contact Us Privacy Policy Comments Policy Cookies Data Dashboard: who stands to benefit from the loss of arctic sea ice Energy Data Dashboard: Climate Social Channels Facebook Twitter Pinterest LinkedIn Youtube Rss SEARCH ARCHIVE Additional ice free arctic history Options Topic Please Select Science Temperature Global temperature UK temperature Rest of world temperature GHGs and aerosols Climate sensitivity Geoengineering ‘Hiatus' Oceans Sea level http://www.nature.com/news/error-discovered-in-antarctic-sea-ice-record-1.15605 rise Ocean warming Marine life Ocean acidification Ice Arctic Antarctic Sea ice Glaciers Extreme weather El Niño Heatwaves Storms Floods Drought Attribution Nature Plants and forests Wildlife Food and farming People Public health Human security Risk and adaptation Public opinion Science communication IPCC Energy Emissions Global emissions UK emissions https://www.carbonbrief.org/analysis-the-highly-unusual-behaviour-of-arctic-sea-ice-in-2016 EU emissions Rest of world emissions Renewables Coal Oil and gas Nuclear Technology Policy Paris Summit 2015 International policy UK policy EU policy Rest of world policy Public opinion In Focus Explainers Factchecks Interviews Infographics Guest posts Media analysis Features Date Range From: To: Sections Sections Science Science Extreme weather Extreme weather Attribution Drought El Niño Floods Heatwaves Storms Latest in: Extreme weather Highlights: Day one at the 1.5C conference on climate change in Oxford Carbon Brief Staff | 21.9.16 In-depth: Climate change confusion over government's flooding review Multiple Authors | 09.9.16 Climate change doubled the chances of Louisiana heavy rains, scientists warn Roz Pidcock | 07.9.16 Ice Ice Antarctic Arctic Glaciers Sea ice Latest in: Ice Highlights: Day one at the 1.5C conference on climate change in Oxford Carbon Brief Staff | 21.9.16 Arctic sea ice summer minimum in 2016 joint-second lowest on record Robert
to the AU edition switch to the INT edition US edition switch to the UK edition switch to the Australia edition switch to https://www.theguardian.com/environment/climate-consensus-97-per-cent/2014/aug/01/error-may-have-overestimated-antarctic-sea-ice-expansion the International The Guardian home › environment › climate change wildlife energy pollution home election 2016 US world opinion sports soccer tech arts lifestyle fashion business travel environment selected browse all sections close Climate change Climate Consensus - the 97% Error in satellite record may have overestimated Antarctic sea ice expansion A jump is discovered in estimated Antarctic sea ice extent what is due to a satellite algorithm This undated photo courtesy of NASA shows Thwaites Glacier in Western Antarctica. Photograph: Handout/AFP/Getty Images John Abraham Friday 1 August 2014 09.00 EDT Last modified on Friday 1 August 2014 10.57 EDT Share on Facebook Share on Twitter Share via Email Share on LinkedIn Share on Google+ Share on WhatsApp Share on Messenger There has been a lot of ice free arctic attention on ice at the southern pole of the Earth. To be clear, the Earth’s climate is changing and the Earth is getting warmer. This means that the oceans are warming, the atmosphere is warming, sea levels are rising, and ice is melting. In fact, the Earth’s ice is melting almost everywhere. In the Arctic, sea ice is in a long-term retreat, the Greenland ice sheet is melting, so is the Antarctic ice sheet as are the world’s glaciers. But, there is a perplexing anomaly. The sea ice (ice floating on water) that surrounds the Antarctic appears to be growing. Scientists want to know why. There are many hypotheses, and my colleague Dana Nuccitelli has written about this recently, but here I add a few emerging points. For instance, we know that there is an enormous amount of ice atop the Antarctic ice sheet that is melting each year. Since ice is much fresher than sea water (less salty), the resulting freshwater is creating a fresher zone of water surrounding the continent. The presence of fresh water affects how easily ice