Daily Archives: March 19, 2018

Arctic Sea Ice and Permafrost Status Report 2017


Climate State
Published on Dec 13, 2017

The Arctic is warming faster than anywhere else on Earth, affecting people in the region, fish and wildlife they depend on for food, and their environment. This unprecedented change has ramifications far beyond the region for the global economy, weather, climate, sea level, trade and security.
Watch the full Arctic Report 2017 AGU press conference at https://www.youtube.com/watch?v=1gTkc…
Highlights https://www.climate.gov/Arctic-2017
Read the report at http://acrtic.noaa.gov/report-card
Teaser image https://pixabay.com/en/iceberg-sea-me…

800m high methane flares in the Arctic Ocean


CAGE Centre for Arctic Gas Hydrate, Environment and Climate
Published on Feb 21, 2017

Methane is released constantly from the ocean floor on several locations in the Arctic Ocean. Visualisation by: Alexey Portnov. https://www.youtube.com/channel/UCekO…

Massive blow out craters formed by hydrate controlled methane expulsion from the Arctic seafloor

Climate Change News

Published on Aug 1, 2017

Massive blow out craters formed by hydrate controlled methane expulsion from the Arctic seafloor: climate change science, biology, experiment, environment, glacier, climate control, Temperature, Carbon dioxide, earth weather.

Climate: https://youtu.be/aPPiVhecMvY Methane takes the quick way out Accounting for all the sources and sinks of methane is important for determining its concentration in the atmosphere. Andreassen et al. found evidence of large craters embedded within methane-leaking subglacial sediments in the Barents Sea, Norway. They propose that the thinning of the ice sheet at the end of recent glacial cycles decreased the pressure on pockets of hydrates buried in the seafloor, resulting in explosive blow-outs. This created the giant craters and released large quantities of methane into the water above.

Abstract

Widespread methane release from thawing Arctic gas hydrates is a major concern, yet the processes, sources, and fluxes involved remain unconstrained. We present geophysical data documenting a cluster of kilometer-wide craters and mounds from the Barents Sea floor associated with large-scale methane expulsion. Combined with ice sheet/gas hydrate modeling, our results indicate that during glaciation, natural gas migrated from underlying hydrocarbon reservoirs and was sequestered extensively as subglacial gas hydrates. Upon ice sheet retreat, methane from this hydrate reservoir concentrated in massive mounds before being abruptly released to form craters. We propose that these processes were likely widespread across past glaciated petroleum provinces and that they also provide an analog for the potential future destabilization of subglacial gas hydrate reservoirs beneath contemporary ice sheets.

Large Underwater Methane seeping Structures can collapse


Climate State
Published on Jun 7, 2017

For the first time, underwater pingos have been found, outside of the permafrost regions. Domes of frozen methane may be warning signs for new blow-outs https://cage.uit.no/news/domes-of-fro…
Related Waking the Giant: Climate Force and Geological Hazards https://www.youtube.com/watch?v=xndhx…
Gas Blowouts on the Yamal and Gydan Peninsulas http://www.geoexpro.com/articles/2015…
View of the methane seeps in the Arctic https://www.youtube.com/watch?v=6oTFj…
Leaking pingos ‘can explode under the sea in the Arctic, as well as on land’ http://siberiantimes.com/science/case…
Massive craters on Arctic Ocean floor caused by methane blow out https://www.youtube.com/watch?v=oNg0z…
Scientists just found telltale evidence of an ancient methane explosion in the Arctic / A methane mound in the Canadian High Arctic, Stephen Grasby https://www.washingtonpost.com/news/e…
Blow-out craters on the Arctic seafloor https://www.youtube.com/watch?v=VQdr0…
Animation: From Glaciation to Global Warming – A Story of Sea Level Change (Titanic Belfast) https://www.youtube.com/watch?v=AKT61…

The sea floor is sinking under the weight of climate change


Climate Change News
Published on Jan 16, 2018
The sea floor is sinking under the weight of climate change

The ocean floor is being deformed under the weight of ever-increasing water from melting ice and redistribution of land water. This unexpected consequence of climate change also appears to be skewing global sea level data making it appear less severe
The consequences of the alarming deformation of the Earth has been highlighted by researchers from Delft University of Technology in the Netherlands.
Combining data on mass loss from the Greenland and Antarctica ice sheets, and changes in water storage on land surfaces (due to dam, reservoirs and irrigation), they were able to feed this information into mathematical equations that could calculate sea level estimates around the globe.
‘I was quite surprised by the outcomes,’ says Thomas Frederikse who authored the study. ‘Over the last 20 years the oceans have become ~2.5 mm deeper. It was already assumed that bottom deformation was small, compared to sea-level rise on a global scale. However, we show that for some regions, especially the Arctic and Southern oceans, its size is considerable.’

Sea level rise is caused primarily by two factors related to global warming: the added water from melting ice sheets and glaciers, and the expansion of sea water as it warms. This rise has long been documented, but what these new findings mean is that the global sea level rise is actually higher than previously thought.

The existing numbers were based on satellite data which measured surface level relative to the centre of the Earth, assuming the ocean floor as basically a fixed constant depth. Now this assumption has been proved to be wrong, the significance being that even more water from melting ice has reentered the oceans than was thought, thanks to climate change and human activity.

Perhaps almost as telling of the state of wilful ignorance to climate change and its consequences, is that the unexpected phenomena of our swelling oceans actually contracting the Earth has been known by scientists for some time, it is simply a lesser documented and less visible symptom of climate change.

The team of researchers from Delft have managed to quantify this extreme effect, finding that the increase in weight of the oceans has caused the sea floor to sink by about 0.1 mm/year between 1993-2014, or 2.5 mm over the entire period, and this is a trend that will only worsen with time.
‘It is widely accepted that, when greenhouse gas emissions won’t be cut, the ice sheets will retreat at a much faster pace than today, and then, due to the massive increase in ocean mass, seafloor deformation will become significant,’ says Frederikse.

The research also revealed some other unexpected consequences, as some areas of the sea floor are forced down, others rise. ‘On regional scales, the effect was certainly larger than expected: in the Arctic, which becomes less and less heavy due to mass loss in Greenland and many glaciers, the ocean floor rises at about 1 mm/y,’ explains Frederikse.

These incremental seafloor changes might not seem all that problematic from land, but for scientists documenting the rate of melting ice and sea level change they are more than simply numbers and maths equations, they signal once again the need for action on climate change.
For Frederikse, this is one of the most important implication of the study. ‘I’m fascinated by the fact that due to our behaviour, we do not only change the Earth’s thermostat, we’re literally deforming our own planet. Fascinating, but very worrisome,’ he says.

Walking on Water: islands adapting to sea level rise

Sustainability GPSS-GLI

Published on Jan 31, 2018

In October 2013, a 7.2-magnitude earthquake struck the province of Bohol, Philippines, inducing about 1m land subsidence to some of its small island communities. Now, the islands of Batasan, Pangapasan, Ubay and Bilangbilangan of the Municipality of Tubigon experience partial or complete flooding even during normal spring tides. Coming face-to-face with a hundred years’ worth of sea level rise, the island communities show that they are far more resilient than we think. Filmed in June 2017, Walking on Water presents the perceptions of the islanders regarding the problems that they are facing If you want to read more, please see: Blog story http://www.thehatch.tv/walkingonwater/ Scientific paper https://www.nature.com/articles/nclim…

RISING SEA LEVELS ACCELERATING


TNC Network
Published on Feb 24, 2018

New Study Finds Sea Level Rise Accelerating Global sea level rise has been accelerating in recent decades, rather than increasing steadily, according to a new study based on 25 years of NASA and European satellite data. This acceleration, driven mainly by increased melting in Greenland and Antarctica, has the potential to double the total sea level rise projected by 2100 when compared to projections that assume a constant rate of sea level rise. If the rate of ocean rise continues to change at this pace, sea level will rise 26 inches by 2100, enough to cause significant problems for coastal cities. Continued study and understanding how fast sea level is increasing can help prepare for the effects in coastal areas around the world.