Arctic river discharge increased over the last several decades, conveying heat and freshwater into the Arctic Ocean and likely affecting regional sea ice and the ocean heat budget. Animation of Arctic sea ice between 1984 and 2016 showing the rapid decline in perennial sea ice. Interlocking melt ponds on Arctic sea ice look like tropical lagoons. The decline in sea ice does have a notable potential to significantly speed up global warming and the climate changes. Including 2020, the linear rate of decline of July sea ice extent is 7.48 percent per decade, or 70,800 square kilometers (27,300 square miles) per year. The Arctic region is warming faster than most regions of the world due in part to increasing greenhouse gases and positive feedbacks associated with the loss of snow and ice cover. Long neglected and dismissed as scientifically unfounded, global warming has now been accepted as a new reality that will have a direct impact on the safety, security and the environment of human habitats. Observation Edit. Retrouvez Arctic Sea Ice Decline: Projected Changes in Timing and Extent of Sea Ice in the Bering and Chukchi Seas et des millions de livres en stock sur Amazon.fr. Noté /5. between the accelerated decline of Arctic sea ice for the past few years and recent anomalously cold and snowy winters over northern continents is based on the following mechanisms. 3 charts showing the alarming decline of Arctic sea ice this year Lili Pike 10/28/2020. Current thickness estimations from satellite radar altimeters employ a snow climatology for converting range measurements to sea ice thickness, but this introduces unrealistically low interannual variability and trends. Projections suggest that Arctic summer sea ice may virtually disappear within the course of the next 50 or even 30 yr with rapid Arctic warming. This volume addresses the rapid decline of Arctic sea ice, placing recent sea ice decline in the context of past observations, climate model simulations and projections, and simple models of the climate sensitivity of sea ice. 2019), are critical to continue to monitor. Sea ice affects Arctic communities and wildlife such as polar bears and walruses. Although sea ice records prior to late 1978 are comparatively sparse, they imply that the recent decline exceeds previous sea ice lows. This September, sea ice covering the Arctic Ocean fell to the second-lowest extent in the satellite record, which began in 1979. The revealed impact of the sea ice decline on the Arctic basin MLD has a strong implication on biogeochemical processes, as winter MLD is one of the key factors regulating summer primary production (e.g., Popova et al. The unusual summer melt of Arctic sea ice in 2007 has encouraged climate science to warn the world that global warming will cause a steep decline in the amount of ice left in subsequent summer melts until the Arctic becomes ice free in summer and that could happen as soon as 2080 or maybe 2060 or it could even be 2030. Sea ice decline affects not only the ocean circulation inside the Arctic Ocean, but also the freshwater outflow to the North Atlantic. And while the area covered by sea ice remains a valuable measurement, scientists are beginning to investigate other parameters that can also serve as key indicators. The wintertime extent of Arctic sea ice is amongst the lowest on record according to NASA and the National Snow and Ice Data Centre. Arctic Sea ice melts in the summer, and more of the sun is being absorbed by the ocean. Achetez et téléchargez ebook Arctic Sea Ice Decline: Observations, Projections, Mechanisms, and Implications (Geophysical Monograph Series Book 180) (English Edition): Boutique Kindle - … You might also be interested in . The impacts of sea ice decline on specific water column phytoplankton properties, such as community composition and carbon biomass (Neeley et al. The Arctic saw its lowest average October sea ice extent since satellite measurements began in 1979, according to European Copernicus Climate Change Service. The objective of this study is to investigate the changes in the pan-Arctic sea ice … Arctic Sea Ice Is Losing Its Bulwark. “I know you don’t want to talk about this,” she said. Chlorophyll-a concentrations give an estimate of the total standing stock of algal biomass. The decline in sea ice in the Arctic presents a stark picture of a changing Earth climate. Arctic Sea Ice Decline: Projected Changes in Timing and Extent of Sea Ice in the Bering and Chukchi Seas By D.C. Douglas. Template:Main Arctic Sea Ice Decline You are here. However, until now, there have been only limited assessments of riverine heat impacts. Images courtesy National Snow and Ice Data Center. Shipping routes. 2018), as well as broader ecosystem responses (Duffy-Anderson et al. El Paso more than doubling number of mobile morgues as virus surges. Arctic sea ice typically reaches its minimum in September, at the end of the summer melt season. (Photo courtesy Dr. Pablo Clemente-Colon, Chief Scientist National Ice Center.) In 2007, sea ice broke all prior satellite records, reaching a record low a month before the end of melt season. In recent decades, accelerated Arctic warming and dramatic sea ice decline have been detected (Comiso 2006, Screen and Simmonds 2010, Walsh 2014, Simmonds 2015).This warming has been referred to as the Arctic amplification (AA) because the Arctic has warmed at about twice the global rate over the past half century (Serreze et al 2007, Budikova 2009, Screen and Simmonds 2013, Walsh … Arctic sea ice decline. Among long-time observers of Arctic sea ice, the 2020 value was significant in that it not only punctuated a long-term decline, but also because it fell below the 4-million-kilometer (1.5-million-mile) threshold for only the second time in the satellite record—after 2012, when the minimum extent dipped to 3.39 million square kilometers (1.31 million square miles). After a decade with nine of the lowest arctic sea-ice minima on record, including the historically low minimum in 2012, we synthesize recent developments in the study of ecological responses to sea-ice decline. As the Arctic sea ice vanishes, it leaves patches of dark water open. Image of the Day Water Snow and Ice. October 2, 2011. August 2008. ABSTRACT . However, … The Arctic … View more Images of the Day: Oct 5, 2004. Home » Media library » Exhibitions and posters » 10 years of Imaging the Earth SPOT VEGETATION » 10 years of imaging North America » Arctic Sea Ice Decline. Over the last thirty years the Arctic ice has been shrinking almost continuously. Primary production. Citing the work of the 2018 Intergovernmental Panel on Climate Change, she chided the attendees for doing “basically nothing” to confront the climate crisis. BBC Weather's Chris Fawkes talks to … Oct 7, 2004. Subscribe to our newsletters Image. The areal extent, concentration and thickness of sea ice in the Arctic Ocean and adjacent seas have strongly decreased during the recent decades, but cold, snow-rich winters have been common over mid-latitude land areas since 2005. The fast rate of the sea ice melting is resulting in the oceans absorbing and heating up the Arctic. When highly reflective sea ice is replaced by open water during the ice melting period, there is a substantial solar heat input directly into the ocean, increasing the heat stored in the upper ocean. Arctic sea ice has been in decline for a while now, but 2020 is turning out to be the second-worst year ever — with implications for the whole planet. knowledge of the Arctic sea-ice dynamics and decline is based on about 40 y of satellite observation, an interval insufficient to document the full range of its natural variability and to fully assess feedbacks on the global ocean, climate, and ecosystems. Mean sea ice thickness is a sensitive indicator of Arctic climate change and in long-term decline despite significant interannual variability. Through 2007, the September decline trend is now over 10 percent per decade. Graph of Arctic Sea Ice Decline (200 KB PDF) June through September 2007 brought record sea ice melt in the Arctic, well below the previous record low, set in September 2005. The fast decline of Arctic sea ice is a leading indicator of ongoing global climate change and is receiving substantial public and scientific attention. Current levels of Arctic sea ice are likely the lowest they have been for the past few centuries. A review is presented on studies addressing the local and remote effects of the sea ice decline on weather and climate. As the climate changes, the Arctic is warming more than twice as fast as the rest of the planet. Transit passage. Arctic sea ice continues decline, reaches second-lowest level. We deduced sea ice growth from FDD that we compared with model (PIOMAS) and satellite (Cryosat-2) estimations. At the World Economic Forum this week in Davos, Switzerland, the young climate change activist Greta Thunberg had stern words for the world’s most powerful people. Achetez neuf ou d'occasion This corresponds to about the size of the state of North Dakota. The study focuses on the boreal summer months from July to September as this timeframe captures significant signals of diminishing sea-ice. Sea ice plays an important role in the global climate system because it influences albedo, heat and gas exchange, freshwater budget, ocean stratification, and deep water mass formation, among other ocean characteristics (1, 2).Presently, there is great concern that with ongoing warming, Arctic sea-ice decline is accelerating at an unprecedented pace not seen in at least the past 1,450 y (). 2010). The warming of the Atmosphere and the vertical heat fluxes from the Ocean are contributing to the Arctic sea ice rapid decline. A disappearance of Arctic sea ice … Image of the Day for October 6, 2004. For more information, please see Arctic Sea Ice Decline Continues. Since the 1970s, Arctic sea-ice decline has been reported throughout the year, but significant declines in SIE and SIC have been observed every year in September .
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