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Mapping the future expansion of Arctic open water
Sea ice impacts most of the Arctic environment, from ocean circulation and marine ecosystems to animal migration and marine transportation. Sea ice has thinned and decreased in age over the observational record. Ice extent has decreased. Reduced ice cover has warmed the surface ocean, accelerated coastal erosion and impacted biological productivity. Declines in Arctic sea-ice extent cannot be explained by internal climate variability alone and can be attributed to anthropogenic effects. However, extent is a poor measure of ice decline at specific locations as it integrates over the entire Arctic basin and thus contains no spatial information. The open water season, in contrast, is a metric that represents the duration of open water over a year at an individual location. Here we present maps of the open water season over the period 1920–2100 using daily output from a 30-member initial-condition ensemble of business-as-usual climate simulations that characterize the expansion of Arctic open water, determine when the open water season will move away from pre-industrial conditions (‘shift’ time) and identify when human forcing will take the Arctic sea-ice system outside its normal bounds (‘emergence’ time). The majority of the Arctic nearshore regions began shifting in 1990 and will begin leaving the range of internal variability in 2040. Models suggest that ice will cover coastal regions for only half of the year by 2070.
http://www.nature.com/nclimate/journal/vaop/ncurrent/full/nclimate2848.html
PIOMAS October 2015
I'm a bit late with this, as the latest data (up to September 30th) was released last week. To make up, here's Andy Lee Robinson's latest video showing the PIOMAS sea ice volume minimum long-term trend: --- Here is the updated Arctic sea ice volume graph as calculated by the Pan-Arctic Ice Oce...
"Recasting the Climate Debate: Feedbacks That Set the Time Scale for Irreversible Change Dissected with New Laser and Optical Technology" by James Anderson
https://vimeo.com/116545040
ASI 2015 update 3: what's it going to be?
During the melting season I'm writing (bi-)weekly updates on the current situation with regards to Arctic sea ice (ASI). Central to these updates are the daily Cryosphere Today sea ice area (SIA) and IJIS sea ice extent (SIE) numbers, which I compare to data from the 2005-2014 period (NSIDC has...
Special issue in 'Philosophical Transactions of the Royal Society A' on "Arctic sea ice reduction: the evidence, models and impacts"
http://rsta.royalsocietypublishing.org/content/373/2045?current-issue=y
ASI 2015 update 1: early start in Beaufort
During the melting season I'm writing (bi-)weekly updates on the current situation with regards to Arctic sea ice (ASI). Central to these updates are the daily Cryosphere Today sea ice area (SIA) and IJIS sea ice extent (SIE) numbers, which I compare to data from the 2005-2014 period (NSIDC has...
Recent studies
e.g. The geographical distribution of fossil fuels unused when limiting global warming to 2 °C
http://www.nature.com/nature/journal/v517/n7533/full/nature14016.html
make clear that:
"We show that development of resources in the Arctic and any increase in unconventional oil production are incommensurate with efforts to limit average global warming to 2 °C."
Obama knows this, and he's said himself that:
"We’re not going to be able to burn it all. Over the course of the next several decades, we’re going to have to build a ramp from how we currently use energy to where we need to use energy. And we’re not going to suddenly turn off a switch and suddenly we’re no longer using fossil fuels, but we have to use this time wisely, so that you have a tapering off of fossil fuels replaced by clean energy sources that are not releasing carbon … But I very much believe in keeping that 2 [degree] Celsius target as a goal."
But by allowing Shell to go and drilling the Arctic he's undermining he own professed goals of reaching the 2°C target and showing how hollow his words are.
This ability to do one thing and say another with regards to climate change is something that psychologists have begun to call "stealth denial"
http://www.rsablogs.org.uk/tag/stealth-denial/
http://mitpress.mit.edu/books/living-denial/
Bill McKibben nails it
This simply has to be shared, as Bill McKibben expresses my thoughts exactly. This sentence just about says it all: "It’s as if the tobacco companies were applying for permission to put cigarette machines in cancer wards. And the White House gave Shell the license." I haven't seen such a good m...
The surprising reason why Arctic warming could be worse than previously thought
http://www.washingtonpost.com/news/energy-environment/wp/2015/04/21/the-surprising-reason-why-arctic-warming-could-be-worse-than-previously-thought/?postshare=501429630306612
CryoSat-2 sea ice thickness maps
Yesterday at one of the EGU 2015 poster sessions I had a short chat with Tommasso Parrinello, the ESA's CryoSat-2 mission manager. He told me lots of useful improvements have been made in the past couple of months, and if all goes well the satellite can remain operational up to 2020 (no guarant...
Hi Neven,
Sorry I missed you. I'm glad you had a good time. It is a bit overwhelming isn't it!
Is this the BBC scoop you were mentioning? :-)
'3D Cryosat' tracks Arctic winter sea ice
http://www.bbc.com/news/science-environment-32348291
EGU 2015, my first scientific conference
I've been living in Austria for 5 years now, living a mere 2 hour drive from Vienna, but somehow I've never come around to visiting the European Geophysical Union's annual general assembly. This year I've decided to make that drive to the Austria Center Vienna and attend EGU 2015, a decision m...
Hey Neven,
I'm going to be there too! I'm intending to sit in on the Polar Climate Predictability and Prediction session as well.
Who knows maybe we'll bump into each other.
If you can make it you would probably like this session on Wednesday afternoon:
CL2.6
Arctic climate change: governing mechanisms and global implications
http://meetingorganizer.copernicus.org/EGU2015/orals/17048
EGU 2015, my first scientific conference
I've been living in Austria for 5 years now, living a mere 2 hour drive from Vienna, but somehow I've never come around to visiting the European Geophysical Union's annual general assembly. This year I've decided to make that drive to the Austria Center Vienna and attend EGU 2015, a decision m...
Arctic Warming and Increased Weather Extremes: The National Research Council Speaks
"A new report from the National Research Council (NRC) details the findings of recent Arctic research: Arctic sea ice in all seasons is declining and the rate of loss is increasing. Multiple lines of study show this is impacting weather outside of the Arctic. Increased energy (heat) in the Arctic is slowing the progress of the jet stream around globe, allowing weather systems to linger, increasing the risk of severe weather happening more often in any one place. Increased warmth also means increased moisture in the Arctic - which increases the amount of snow, which in turn causes the jet stream to concentrate winter weather in North America and Eurasia."
http://www.truth-out.org/news/item/24485-arctic-warming-and-increased-weather-extremes-the-national-research-council-speaks
ASI 2014 update 5: low times
During the melting season I'm writing (bi-)weekly updates on the current situation with regards to Arctic sea ice (ASI). Central to these updates are the daily Cryosphere Today sea ice area (SIA) and IJIS sea ice extent (SIE) numbers, which I compare to data from the 2005-2013 period (NSIDC has...
Tracking the breakup of Arctic summer sea ice
As sea ice begins to melt back toward its late September minimum, it is being watched as never before. Scientists have put sensors on and under ice in the Beaufort Sea for an unprecedented campaign to monitor the summer melt. The international effort hopes to figure out the physics of the ice edge in order to better understand and predict open water in Arctic seas.
http://esciencenews.com/articles/2014/07/16/tracking.breakup.arctic.summer.sea.ice
ASI 2014 update 5: low times
During the melting season I'm writing (bi-)weekly updates on the current situation with regards to Arctic sea ice (ASI). Central to these updates are the daily Cryosphere Today sea ice area (SIA) and IJIS sea ice extent (SIE) numbers, which I compare to data from the 2005-2013 period (NSIDC has...
Hey CB, have you got a link to a ref for this?
"The fires in Canada. are burning 6 feet into the the ground. We have seen this before."
I'd really like to see it, thanks. :-)
ASI 2014 update 5: low times
During the melting season I'm writing (bi-)weekly updates on the current situation with regards to Arctic sea ice (ASI). Central to these updates are the daily Cryosphere Today sea ice area (SIA) and IJIS sea ice extent (SIE) numbers, which I compare to data from the 2005-2013 period (NSIDC has...
Arctic summer sea ice is disappearing fast, but can we rescue it?
Diminishing Arctic sea ice is perhaps the most iconic consequence of climate change. And there's a good chance we'll lose it in summer before too long if emissions stay high, according to a new paper. But its demise is not a foregone conclusion - with a swift peak and decline in greenhouse gases we could still reverse that trend, the scientists say.
http://www.carbonbrief.org/blog/2014/07/arctic-summer-sea-ice-is-disappearing-fast,-but-can-we-rescue-it?utm_content=buffer76a44&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer
ASI 2014 update 5: low times
During the melting season I'm writing (bi-)weekly updates on the current situation with regards to Arctic sea ice (ASI). Central to these updates are the daily Cryosphere Today sea ice area (SIA) and IJIS sea ice extent (SIE) numbers, which I compare to data from the 2005-2013 period (NSIDC has...
I find it unlikely that the Canadians would be planting trees as part of a carbon sequestration scheme. Most coupled vegetation climate models I've seen show that the the northward migration of the tree line will decrease the planets albedo and that this will offset any gain from carbon sequestration and actually act as an additional warming feedback.
The day the ice cap died
The title of this blog post is actually the title of a piece of science fiction, a short story written by Paul Briggs. Just like a couple of weeks ago when I was asked for advice on an idea for a novel, Paul asked me for some feedback on his short story. I figured posting it here, will generate...
Future increases in Arctic precipitation linked to local evaporation and sea-ice retreat
Precipitation changes projected for the end of the twenty-first century show an increase of more than 50 per cent in the Arctic regions. This marked increase, which is among the highest globally, has previously been attributed primarily to enhanced poleward moisture transport from lower latitudes. Here we use state-of-the-art global climate models to show that the projected increases in Arctic precipitation over the twenty-first century, which peak in late autumn and winter, are instead due mainly to strongly intensified local surface evaporation (maximum in winter), and only to a lesser degree due to enhanced moisture inflow from lower latitudes (maximum in late summer and autumn). Moreover, we show that the enhanced surface evaporation results mainly from retreating winter sea ice, signalling an amplified Arctic hydrological cycle. This demonstrates that increases in Arctic precipitation are firmly linked to Arctic warming and sea-ice decline. As a result, the Arctic mean precipitation sensitivity (4.5 per cent increase per degree of temperature warming) is much larger than the global value (1.6 to 1.9 per cent per kelvin). The associated seasonally varying increase in Arctic precipitation is likely to increase river discharge and snowfall over ice sheets (thereby affecting global sea level), and could even affect global climate through freshening of the Arctic Ocean and subsequent modulations of the Atlantic meridional overturning circulation
http://www.nature.com/nature/journal/v509/n7501/full/nature13259.html
Greenland 2013 in review
Here's a re-post of the NSIDC's Greenland Ice Sheet Today website, but let me also draw attention to this wonderful new resource, Polar Portal, set up by various Danish scientific research organisations. It has various maps and graphs depicting the situation on Greenland, but also the rest of th...
Sentinel satellite spies ice cap speed-up
http://www.bbc.co.uk/news/science-environment-27330321
PIOMAS May 2014
Another month has passed and so here is the updated Arctic sea ice volume graph as calculated by the Pan-Arctic Ice Ocean Modeling and Assimilation System (PIOMAS) at the Polar Science Center: On the PIOMAS website the following is written: The 2014 ice volume reached its annual maximum in Ap...
Nature Paper: Half Of Arctic Warming Due To Pacific
http://www.reportingclimatescience.com/news-stories/article/nature-paper-half-of-arctic-warming-due-to-pacific-variations.html
PIOMAS May 2014
Another month has passed and so here is the updated Arctic sea ice volume graph as calculated by the Pan-Arctic Ice Ocean Modeling and Assimilation System (PIOMAS) at the Polar Science Center: On the PIOMAS website the following is written: The 2014 ice volume reached its annual maximum in Ap...
Swell and sea in the emerging Arctic Ocean
Ocean surface waves (sea and swell) are generated by winds blowing over a distance (fetch) for a duration of time. In the Arctic Ocean, fetch varies seasonally from essentially zero in winter to hundreds of kilometers in recent summers. Using in situ observations of waves in the central Beaufort Sea, combined with a numerical wave model and satellite sea ice observations, we show that wave energy scales with fetch throughout the seasonal ice cycle. Furthermore, we show that the increased open water of 2012 allowed waves to develop beyond pure wind seas and evolve into swells. The swells remain tied to the available fetch, however, because fetch is a proxy for the basin size in which the wave evolution occurs. Thus, both sea and swell depend on the open water fetch in the Arctic, because the swell is regionally driven. This suggests that further reductions in seasonal ice cover in the future will result in larger waves, which in turn provide a mechanism to break up sea ice and accelerate ice retreat.
http://onlinelibrary.wiley.com/doi/10.1002/2014GL059983/abstract
Miscellanea
I have collected a couple of interesting news articles and interviews over the past few weeks, and now it's time to share with those of you who haven't seen them. I'm posting what I found the most interesting excerpts, follow the links if you want to read the rest. First up, an interview on Sci...
Jai and Hans,
This video is pertinent to your discussion on the rebound effect...
Duncan Clark- The Burning Question
http://vimeo.com/85228251
Miscellanea
I have collected a couple of interesting news articles and interviews over the past few weeks, and now it's time to share with those of you who haven't seen them. I'm posting what I found the most interesting excerpts, follow the links if you want to read the rest. First up, an interview on Sci...
September Arctic sea-ice minimum predicted by spring melt-pond fraction
The area of Arctic September sea ice has diminished from about 7 million km2 in the 1990s to less than 5 million km2 in five of the past seven years, with a record minimum of 3.6 million km2 in 2012). The strength of this decrease is greater than expected by the scientific community, the reasons for this are not fully understood, and its simulation is an on-going challenge for existing climate models. With growing Arctic marine activity there is an urgent demand for forecasting Arctic summer sea ice4. Previous attempts at seasonal forecasts of ice extent were of limited skill. However, here we show that the Arctic sea-ice minimum can be accurately forecasted from melt-pond area in spring. We find a strong correlation between the spring pond fraction and September sea-ice extent. This is explained by a positive feedback mechanism: more ponds reduce the albedo; a lower albedo causes more melting; more melting increases pond fraction. Our results help explain the acceleration of Arctic sea-ice decrease during the past decade. The inclusion of our new melt-pond model promises to improve the skill of future forecast and climate models in Arctic regions and beyond.
http://www.nature.com/nclimate/journal/vaop/ncurrent/full/nclimate2203.html
[I can't log on again, so I'm adding this directly:
Thanks a lot for this, Boa05att! It confirms what I've been suspecting for a while.
Neven]
Miscellanea
I have collected a couple of interesting news articles and interviews over the past few weeks, and now it's time to share with those of you who haven't seen them. I'm posting what I found the most interesting excerpts, follow the links if you want to read the rest. First up, an interview on Sci...
High predictability of the winter Euro–Atlantic climate from cryospheric variability
Seasonal prediction skill for surface winter climate in the Euro–Atlantic sector has been limited so far1, 2, 3. In particular, the predictability of the winter North Atlantic Oscillation, the mode that largely dominates regional atmospheric and climate variability, remains a hurdle for present dynamical prediction systems4, 5. Statistical forecasts have also been largely elusive6, 7, 8, but October Eurasian snow cover has been shown to be a robust source of regional predictability9, 10. Here we use maximum covariance analysis to show that Arctic sea-ice variability represents another good predictor of the winter Euro–Atlantic climate at lead times of as much as three months. Cross-validated hindcasts of the winter North Atlantic Oscillation index using September sea-ice anomalies yield a correlation skill of 0.59 for the period 1979/1980–2012/2013, suggesting that 35% of its variance could be predicted three months in advance. This skill can be further enhanced, at the expense of a shorter lead time, by using October Eurasian snow cover as an additional predictor. Skilful predictions of winter European surface air temperature and precipitation are also obtained with September sea ice as the only predictor. We conclude that it is important to incorporate Arctic sea-ice variability in seasonal prediction systems.
http://www.nature.com/ngeo/journal/vaop/ncurrent/abs/ngeo2118.html
PIOMAS March 2014
Another month has passed and so here is the updated Arctic sea ice volume graph as calculated by the Pan-Arctic Ice Ocean Modeling and Assimilation System (PIOMAS) at the Polar Science Center: During the month of February the gap between this year and the other years from the post-2010 period ...
Study coauthor Shfaqat A. Khan of the Technical University of Denmark told Mashable he was surprised to find such significant ice loss in northeast Greenland, considering how cold and dry that region is. Previous studies of sea level rise had not included the prospect of melting there, he said.
“Nature is changing faster than expected and seems to respond much stronger than expected to small fluctuations,” he said. “This also means that predictions of future sea level rise need to be revised.”
More worrisome, Khan and his coauthors said, is that these glaciers help hold back a nearly 370-mile long ice stream that extends deep into Greenland’s interior. This ice stream accounts for about 16% of the total ice sheet, and if it destabilizes, it could have severe consequences for low-lying coastal cities worldwide.
http://mashable.com/2014/03/16/greenland-ice-melt-sea-level-rise/
While the northwest and southeast section of Greenland have dramatically lost ice, researchers believed the northeast section was holding its ground. From 1978-2003, that was true, but ice loss has accelerated rapidly since mid-2003...
By 2012, the snout of the Zachariae glacier had receded more than 12.4 miles from its 2003 position. In comparison, the Jakobshavn glacier, located in southeast Greenland and long considered one of the fastest-changing glaciers on the island, has retreated 21.7 miles over the past 150 years.
http://www.climatecentral.org/news/new-greenland-ice-melt-fuels-sea-level-rise-concerns-17187
PIOMAS March 2014
Another month has passed and so here is the updated Arctic sea ice volume graph as calculated by the Pan-Arctic Ice Ocean Modeling and Assimilation System (PIOMAS) at the Polar Science Center: During the month of February the gap between this year and the other years from the post-2010 period ...
Changes in Arctic melt season and implications for sea ice loss
Abstract
The Arctic-wide melt season has lengthened at a rate of 5 days decade−1 from 1979 to 2013, dominated by later autumn freezeup within the Kara, Laptev, East Siberian, Chukchi, and Beaufort seas between 6 and 11 days decade−1. While melt onset trends are generally smaller, the timing of melt onset has a large influence on the total amount of solar energy absorbed during summer. The additional heat stored in the upper ocean of approximately 752 MJ m−2 during the last decade increases sea surface temperatures by 0.5 to 1.5 °C and largely explains the observed delays in autumn freezeup within the Arctic Ocean's adjacent seas. Cumulative anomalies in total absorbed solar radiation from May through September for the most recent pentad locally exceed 300–400 MJ m−2 in the Beaufort, Chukchi, and East Siberian seas. This extra solar energy is equivalent to melting 0.97 to 1.3 m of ice during the summer.
http://onlinelibrary.wiley.com/doi/10.1002/2013GL058951/abstract
PIOMAS March 2014
Another month has passed and so here is the updated Arctic sea ice volume graph as calculated by the Pan-Arctic Ice Ocean Modeling and Assimilation System (PIOMAS) at the Polar Science Center: During the month of February the gap between this year and the other years from the post-2010 period ...
Warm rivers play role in Arctic sea ice melt
The heat from warm river waters draining into the Arctic Ocean is contributing to the melting of Arctic sea ice each summer, a new NASA study finds.
http://www.sciencedaily.com/releases/2014/03/140305134019.htm
Another ice extreme
In some quarters extreme weather events and broken records are presented as evidence that the climate isn't changing. That's a bit difficult to do with Arctic sea ice, of course (although they try*), but record Antarctic sea ice numbers fully compensate for this, right? The 2013/2014 Arctic win...
Warming from Arctic Sea Ice Melting More Dramatic than Thought
Scientists based at the University of California, San Diego have analyzed Arctic satellite data from 1979 to 2011, and have found that average Arctic albedo levels have decreased from 52 percent to 48 percent since 1979 — twice as much as previous studies based on models have suggested, the team reports today (Feb. 17) in the journal Proceedings of the National Academy of Sciences.
The amount of heat generated by this decrease in albedo is equivalent to roughly 25 percent of the average global warming currently occurring due to increased carbon dioxide levels, the team reports.
"Although more work is needed, a possible implication of this is that the amplifying feedback of Arctic sea ice retreat on global warming is larger than has been previously expected," study co-author Ian Eisenman told Live Science.
http://www.livescience.com/43435-arctic-sea-ice-melt-causes-dramatic-warming.html
PIOMAS February 2014 (upgrade to Version 2.1)
Another month has passed, but this time there is more than just a data update. It seems the whole PIOMAS version 2.0 has been upgraded to 2.1. As it says on the Polar Science Center website: We identified a programming error in a routine that interpolates ice concentration data prior to assimil...
Climate model projections show an Arctic-wide end-of-century temperature increase of +13° Celsius [23°F!] in late fall and +5° Celsius [9°F] in late spring if the status quo continues and current emissions increase without a mitigation scenario.
http://thinkprogress.org/climate/2014/02/13/3280421/arctic-autumn-staggering-warming/
PIOMAS February 2014 (upgrade to Version 2.1)
Another month has passed, but this time there is more than just a data update. It seems the whole PIOMAS version 2.0 has been upgraded to 2.1. As it says on the Polar Science Center website: We identified a programming error in a routine that interpolates ice concentration data prior to assimil...
Arctic Warmth in Early February Sees 200,000 Square Kilometers of Sea Ice Lost, Greenland Melt as New Study Finds Massive Glacier Triples its Seaward Velocity
http://robertscribbler.wordpress.com/2014/02/05/arctic-warmth-in-early-february-sees-200000-square-kilometers-of-sea-ice-lost-greenland-melt-as-new-study-finds-massive-glacier-triples-its-seaward-velocity/#comment-7713
2014 Nares Strait ice bridges
This remains one of my favourite fascinating events in the Arctic. University of Delaware professor in oceanography Andreas Muenchow, the Nares Strait go-to guy, posted the following on his Icy Seas blog: Formation of Nares Strait Ice Bridges in 2014 Darkness and cold covers North Greenland, El...
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