Climate Change science - Sea-level rise

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Description: 106 results (October 2017)
Source/publisher: Mongabay via Google
Date of entry/update: 2017-10-26
Grouping: Websites/Multiple Documents
Language: English
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Description: Understanding Sea Level... NASA keeps track of sea level change and its causes from space... Find out more about how NASA satellite observations...help our understanding of this complex topic.... Causes; Observations; Projections; Adaptati
Source/publisher: NASA (National Aeronautics and Space Administration)
Date of entry/update: 2017-03-24
Grouping: Websites/Multiple Documents
Language: English
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Description: Mission Statement: "The Scripps mission is to seek, teach, and communicate scientific understanding of the oceans, atmosphere, Earth, and other planets for the benefit of society and the environment..."
Source/publisher: Scripps Institution of Oceanography
Date of entry/update: 2018-01-01
Grouping: Websites/Multiple Documents
Language: English
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Description: ''The sudden and dramatic infl ux of more than 700,000 Rohingya refugees from Myanmar in the latter part of 2017 wrought terrible environmental damage to a region that was already battling some of the severest effects of climatic change. In the hills south of Cox’s Bazar town, several thousand acres of forest and vegetation were cleared to make way for bamboo and tarpaulin camps needed to accommodate the refugees (more than half of whom are children). The exposed sandy soil has left them at risk of landslides and fl ash fl ooding, especially during the monsoon months. “The woodland and vegetation are essential for stabilizing the sandy and undulating terrain,” says UNICEF’s Nazzina Mohsin, who specializes in environmental issues. “Over time, the loss of so much green cover could also affect the amount of rainfall the area receives.” In one corner of the sprawling Kutapalong refugee camp, a solitary Banyan tree towers above a sea of plastic shelters, a poignant remnant of the forest that used to dominate the area. The coastline of Cox’s Bazar District - whose 120 kilometre beach is one of the world’s longest - has been under assault from rising sea levels and salt water intrusion for years. Along the coastal road leading to the southern town of Teknaf, teams of labourers are often at work, stacking concrete blocks in an attempt to hold back the encroaching waves. Local residents also say weather patterns have noticeably changed over the years, with shorter winters and warmer summers. And while the authorities have made efforts to provide cyclone shelters for the Bangladeshi population, the shelters are insuffi cient for the needs of the refugee community during the lengthy monsoon season...''
Source/publisher: UNICEF (United Nations Children's Fund)
2019-04-05
Date of entry/update: 2019-04-06
Grouping: Individual Documents
Language: English
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Description: ABSTRACT:: "Mechanisms such as ice‐shelf hydrofracturing and ice‐cliff collapse may rapidly increase discharge from marine‐based ice sheets. Here, we link a probabilistic framework for sea‐level projections to a small ensemble of Antarctic ice‐sheet (AIS) simulations incorporating these physical processes to explore their influence on global‐mean sea‐level (GMSL) and relative sea‐level (RSL). We compare the new projections to past results using expert assessment and structured expert elicitation about AIS changes. Under high greenhouse gas emissions (Representative Concentration Pathway [RCP] 8.5), median projected 21st century GMSL rise increases from 79 to 146 cm. Without protective measures, revised median RSL projections would by 2100 submerge land currently home to 153 million people, an increase of 44 million. The use of a physical model, rather than simple parameterizations assuming constant acceleration of ice loss, increases forcing sensitivity: overlap between the central 90% of simulations for 2100 for RCP 8.5 (93–243 cm) and RCP 2.6 (26–98 cm) is minimal. By 2300, the gap between median GMSL estimates for RCP 8.5 and RCP 2.6 reaches >10 m, with median RSL projections for RCP 8.5 jeopardizing land now occupied by 950 million people (versus 167 million for RCP 2.6). The minimal correlation between the contribution of AIS to GMSL by 2050 and that in 2100 and beyond implies current sea‐level observations cannot exclude future extreme outcomes. The sensitivity of post‐2050 projections to deeply uncertain physics highlights the need for robust decision and adaptive management frameworks...... PLAIN LANGUAGE SUMMARY: Recent ice‐sheet modeling papers have introduced new physical mechanisms—specifically the hydrofracturing of ice shelves and the collapse of ice cliffs—that can rapidly increase ice‐sheet mass loss from a marine‐based ice‐sheet, as exists in much of Antarctica. This paper links new Antarctic model results into a sea‐level rise projection framework to examine their influence on global and regional sea‐level rise projections and their associated uncertainties, the potential impact of projected sea‐level rise on areas currently occupied by human populations, and the implications of these projections for the ability to constrain future changes from present observations. Under a high greenhouse gas emission future, these new physical processes increase median projected 21st century GMSL rise from ∼80 to ∼150 cm. Revised median RSL projections for a high‐emissions future would, without protective measures, by 2100 submerge land currently home to more than 153 million people. The use of a physical model indicates that emissions matter more for 21st century sea‐level change than previous projections showed. Moreover, there is little correlation between the contribution of Antarctic to sea‐level rise by 2050 and its contribution in 2100 and beyond, so current sea‐level observations cannot exclude future extreme outcomes..."
Creator/author: Robert E. Kopp Robert M. DeConto Daniel A. Bader Carling C. Hay Radley M. Horton Scott Kulp Michael Oppenheimer David Pollard Benjamin H. Strauss
Source/publisher: Rutgers University
2017-12-13
Date of entry/update: 2019-01-06
Grouping: Individual Documents
Language: English
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Description: "What is happening to sea levels? That was perhaps the most controversial issue in the 4th IPCC report of 2007. The new report of the Intergovernmental Panel on Climate Change is out now, and here I will discuss what IPCC has to say about sea-level rise (as I did here after the 4th report)..... Let us jump straight in with the following graph which nicely sums up the key findings about past and future sea-level rise: (1) global sea level is rising, (2) this rise has accelerated since pre-industrial times and (3) it will accelerate further in this century. The projections for the future are much higher and more credible than those in the 4th report but possibly still a bit conservative, as we will discuss in more detail below. For high emissions IPCC now predicts a global rise by 52-98 cm by the year 2100, which would threaten the survival of coastal cities and entire island nations. But even with aggressive emissions reductions, a rise by 28-61 cm is predicted. Even under this highly optimistic scenario we might see over half a meter of sea-level rise, with serious impacts on many coastal areas, including coastal erosion and a greatly increased risk of flooding..."
Creator/author: Stefan Rahmstorf
Source/publisher: IPCC via "RealClimate"
2018-10-30
Date of entry/update: 2019-01-06
Grouping: Individual Documents
Language: English
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Description: " Antarctica has lost 3 trillion tons of ice in the past 25 years, and that ice loss has accelerated rapidly over the last five years. In a new study, the most comprehensive to date of the continent?s icy status, an international group of 84 researchers analyzed data from multiple satellite surveys, from 1992 to 2017. They discovered that Antarctica is currently losing ice about three times faster than it did until 2012, climbing to a rate of more than 241 billion tons (219 billion metric tons) per year. Total ice loss during the 25-year period contributed to sea level rise of about 0.3 inches (around 8 millimeters), approximately 40 percent of which — about 0.1 inches (3 mm) — happened in the past five years."
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Source/publisher: "Live Science - Planet Earth"
2018-06-13
Date of entry/update: 2018-06-14
Grouping: Individual Documents
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Description: "The Antarctic Ice Sheet is an important indicator of climate change and driver of sea-level rise. Here we combine satellite observations of its changing volume, flow and gravitational attraction with modelling of its surface mass balance to show that it lost 2,720 ± 1,390 billion tonnes of ice between 1992 and 2017, which corresponds to an increase in mean sea level of 7.6 ± 3.9 millimetres (errors are one standard deviation). Over this period, ocean-driven melting has caused rates of ice loss from West Antarctica to increase from 53 ± 29 billion to 159 ± 26 billion tonnes per year; ice-shelf collapse has increased the rate of ice loss from the Antarctic Peninsula from 7 ± 13 billion to 33 ± 16 billion tonnes per year. We find large variations in and among model estimates of surface mass balance and glacial isostatic adjustment for East Antarctica, with its average rate of mass gain over the period 1992?2017 (5 ± 46 billion tonnes per year) being the least certain"
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Source/publisher: "Nature" VOL 558, 14 JUNE 2018
2018-06-14
Date of entry/update: 2018-06-14
Grouping: Individual Documents
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Description: "If you want to know what the changing climate is doing to the earth, ask someone who?s been there. Jason Briner has been above the Arctic Circle more than 35 times. He takes the big topic of global warming and shows you what it?s doing to a very important place in this talk.£
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Source/publisher: TED Talks via Youtube (19 minutes)
2016-12-09
Date of entry/update: 2018-05-31
Grouping: Individual Documents
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Description: "Scientists, engineers and governments plan for today?s super sized storms by using barriers and technology in an attempt to protect coastal populations..."
Source/publisher: BLUE GLOBE via Youtube
2014-09-01
Date of entry/update: 2018-05-28
Grouping: Individual Documents
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Description: "Our oceans are rising. With human use of hydrocarbons skyrocketing, waters around the globe are getting hotter and, now, this warm sub-surface water is washing into Antarctica?s massive western glaciers causing the glaciers to retreat and break off. Antarctica holds 90% of the world?s ice and 70% of its freshwater, so if even a small fraction of the ice sheet in Antarctica melts, the resulting sea level rise will completely remap the world as we know it ? and it is already happening. In the last decade, some of the most significant glaciers here have tripled their melt rate. VICE founder Shane Smith travels to the bottom of the world to investigate the instability of the West Antarctic ice sheet and to see first hand how the continent is melting -- and VICE follows the rising oceans to Bangladesh for a glimpse into the world?s underwater future. From the UN Climate conference to the People?s Climate March to the forces that deny the science of global climate change, this special extended episode covers all sides of the issue and all corners of the globe, ending with a special interview with Vice President Joe Biden. Watch Season 4 of VICE on Fridays at 11 PM, only on HBO. Watch Season 1: http://bit.ly/1HyVviK Watch Season 2: http://bit.ly/1LBL8y6 More from Shane Smith: http://www.vice.com/author/shane-smith Follow Shane on Twitter: https://twitter.com/shanesmith30 If you, like us, want to help put the brakes on global warming, or just want to learn more about what you saw in tonight?s episode, check out these groups and get involved: Climate Central, Bangladesh Center for Advanced Studies, Environmental Defense Fund, National Science Foundation, Ralph J. and Carol M. Cierone Endowed Chair and Fellowship Fund in Earth System Science, and the Gordon and Betty Moore Foundation."
Source/publisher: VICE on HBO via Youtube
2016-01-11
Date of entry/update: 2018-04-29
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Description: "Global sea levels could rise by more than three metres ? over half a metre more than previously thought ? this century alone, according to a new study co-authored by a University of Southampton scientist. An international team including Sybren Drijfhout, Professor in Physical Oceanography and Climate Physics, looked at what might happen if carbon dioxide emissions continue unabated. Using new projections of Antarctic mass loss and a revised statistical method, they concluded that a worst-case scenario of a 2.5 to three-metre sea level rise was possible by 2100.
Source/publisher: University of Southanpton
2017-04-25
Date of entry/update: 2017-07-02
Grouping: Individual Documents
Language: English
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Description: Melting Ice, Rising Seas (Part One) - Prof Jonathan Bamber, Introduced by Prof Bryan Storey... Melting Ice, Rising Seas (Part Two) - Dr Steve Rintoul, Research Team Leader, CSIRO Australia... Melting Ice, Rising Seas (Part Three) - Director of the Antarctic Research Centre... Melting Ice, Rising Seas (Part Four) - Prof Rob DeConto, University of Massachusetts
Creator/author: Prof Jonathan Bamber, Dr Steve Rintoul, Tim Naish, Prof Rob DeConto
Source/publisher: The Antarctic Report - Royal Society of New Zealand
2016-01-13
Date of entry/update: 2017-01-24
Grouping: Individual Documents
Language: English
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Description: "This is the story of the century. We have passed a tipping point and are now in a new era ? one where the melting of global ice sheets will dramatically transform our world. John clearly explains the latest science and puts sea level rise into a historical perspective. He then paints a vivid picture of what we can expect in the future, the potential solutions and what we must do now to create resilient cities and communities. In this enlightening presentation you?ll learn: Why sea level rise is now unstoppable The realistic projections over the coming decades Why the triple threat from storms, tides and sea level rise is producing deadly floods Why real estate values will go ?underwater” long before the property does Some of the potential business opportunities that could benefit our economy Why communities, businesses and individuals must start planning and adapting now Higher Sea Levels Mean Big Risk and Big Business Opportunities Businesses need to have the latest information on how sea level rise is going to impact their assets and supply chains in coastal zones around the world. Seeing what lies ahead can reduce risk and identify potential new business opportunities. John highlights the realistic projections that can impact an organization?s bottom line, because today the most important line in business is the shoreline. Rising Seas: Community Planning for a new era Municipalities in coastal zones and on tidal rivers must now plan for a full range of flooding scenarios from the interplay of storms, tides and sea level rise. John explains how good planning needs to consider short, medium and long range time scales to create cost effective resiliency..."
Creator/author: John Englander
Source/publisher: The Real Truth About Health Conference
2016-03-11
Date of entry/update: 2017-01-23
Grouping: Individual Documents
Language: English
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Description: "Miami, New Orleans and New York City completely under water it?s a very real possibility if sea levels continue to rise. In Earth Under Water we?ll see these events unfold as leading experts forecast how mankind will be impacted if global warming continues. They?ll break down the science behind these predictions and explore ways humanity could adapt, including engineering vast dams near San Francisco, or building floating cities outside of New York..."
Source/publisher: National Geographic
2014-10-01
Date of entry/update: 2017-01-22
Grouping: Individual Documents
Language: English
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Description: Abstract. "We use numerical climate simulations, paleoclimate data, and modern observations to study the effect of growing ice melt from Antarctica and Greenland. Meltwater tends to stabilize the ocean column, inducing amplifying feedbacks that increase subsurface ocean warming and ice shelf melting. Cold meltwater and induced dynamical effects cause ocean surface cooling in the Southern Ocean and North Atlantic, thus increasing Earth?s energy imbalance and heat flux into most of the global ocean?s surface. Southern Ocean surface cooling, while lower latitudes are warming, increases precipitation on the Southern Ocean, increasing ocean stratification, slowing deepwater formation, and increasing ice sheet mass loss. These feedbacks make ice sheets in contact with the ocean vulnerable to accelerating disintegration. We hypothesize that ice mass loss from the most vulnerable ice, sufficient to raise sea level several meters, is better approximated as exponential than by a more linear response. Doubling times of 10, 20 or 40 years yield multi-meter sea level rise in about 50, 100 or 200 years. Recent ice melt doubling times are near the lower end of the 10?40-year range, but the record is too short to confirm the nature of the response. The feedbacks, including subsurface ocean warming, help explain paleoclimate data and point to a dominant Southern Ocean role in controlling atmospheric CO2, which in turn exercised tight control on global temperature and sea level. The millennial (500?2000-year) timescale of deep-ocean ventilation affects the timescale for natural CO2 change and thus the timescale for paleo-global climate, ice sheet, and sea level changes, but this paleo-millennial timescale should not be misinterpreted as the timescale for ice sheet response to a rapid, large, human-made climate forcing. These climate feedbacks aid interpretation of events late in the prior interglacial, when sea level rose to +6?9 m with evidence of extreme storms while Earth was less than 1 °C warmer than today. Ice melt cooling of the North Atlantic and Southern oceans increases atmospheric temperature gradients, eddy kinetic energy and baroclinicity, thus driving more powerful storms. The modeling, paleoclimate evidence, and ongoing observations together imply that 2 °C global warming above the preindustrial level could be dangerous. Continued high fossil fuel emissions this century are predicted to yield (1) cooling of the Southern Ocean, especially in the Western Hemisphere; (2) slowing of the Southern Ocean overturning circulation, warming of the ice shelves, and growing ice sheet mass loss; (3) slowdown and eventual shutdown of the Atlantic overturning circulation with cooling of the North Atlantic region; (4) increasingly powerful storms; and (5) nonlinearly growing sea level rise, reaching several meters over a timescale of 50?150 years. These predictions, especially the cooling in the Southern Ocean and North Atlantic with markedly reduced warming or even cooling in Europe, differ fundamentally from existing climate change assessments. We discuss observations and modeling studies needed to refute or clarify these assertions"...... James Hansen, Makiko Sato, Paul Hearty, Reto Ruedy, Maxwell Kelley, Valerie Masson-Delmotte, Gary Russell, George Tselioudis, Junji Cao, Eric Rignot, Isabella Velicogna, Blair Tormey, Bailey Donovan, Evgeniya Kandiano, Karina von Schuckmann, Pushker Kharecha, Allegra N. Legrande, Michael Bau, and Kwok-Wai Lo
Creator/author: James Hansen et al
Source/publisher: "Atmospheric Chemistry and Physics"
2016-03-22
Date of entry/update: 2016-06-25
Grouping: Individual Documents
Language: English
Format : pdf
Size: 7.17 MB
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