Sentences with phrase «by permafrost erosion»

Analysis of carbon isotopes in seabed samples from 14 offshore sites indicated that about 13 % of the carbon released by permafrost erosion ends up sequestered in nearshore sediments.

Not exact matches

For instance, researchers may have a limited time to survey coastal archaeological sites threatened by erosion, to sample melting ice sheets holding clues to past climates, and to document so - called thermokarst lakes, which are formed by meltwater from permafrost.

They found that high rates of carbon accumulation in lake sediments were stimulated by several factors, including «thermokarst erosion and deposition of terrestrial organic matter, -LSB-...] nutrient release from thawing permafrost that stimulated lake productivity, and by slow decomposition in cold, anoxic lake bottoms.»

Changes in permafrost could cause significant impacts — for example, by causing erosion that damages buildings, roads, or other infrastructure, by causing shifts in ecosystems, and by contributing large amounts of carbon to the atmosphere.

Alaska's coast is vulnerable to the effects of sea - ice retreat, thawing of coastal permafrost, and rising sea level, all of which are caused by warming, and combine to increase coastal erosion.

The MacKenzie River region, which supports one of the world's last major wild rivers, has warmed by 3.1 ° F (1.7 ° C) over the past century.2, 3 This warming has endangered the long - term stability of much of the permafrost — the frozen mix of rock, soil, and ice that underlies and surrounds the river basin3, 3 — raising the risk of erosion, flooding, landslides, and other significant changes to the landscape.2, 3,4,5,6

With the late - summer ice edge located farther north than it used to be, storms produce larger waves and more coastal erosion.5 An additional contributing factor is that coastal bluffs that were «cemented» by ice - rich permafrost are beginning to thaw in response to warmer air and ocean waters, and are therefore more vulnerable to erosion.22 Standard defensive adaptation strategies to protect coastal communities from erosion, such as use of rock walls, sandbags, and riprap, have been largely unsuccessful.23 Several coastal communities are seeking to relocate to escape erosion that threatens infrastructure and services but, because of high costs and policy constraints on use of federal funds for community relocation, only one Alaskan village has begun to relocate (see also Ch.

There is new information that lack of sea ice causes storms to produce larger waves and more coastal erosion.5 An additional contributing factor is that coastal bluffs that were «cemented» by permafrost are beginning to thaw in response to warmer air and ocean waters, and are therefore more vulnerable to erosion.22 Standard defensive adaptation strategies to protect coastal communities from erosion such as use of rock walls, sandbags, and riprap have been largely unsuccessful.23 There remains considerable uncertainty, however, about the spatial patterns of future coastal erosion.

Yet in view of the entirely predictable erosion of sink capacity (by forest loss & combustion, soils» desiccation, permafrost melt, and oceans» warming and acidification) that notion appears to be an outstanding example of optimism bias.

Hard to know how the amount of carbon being released by erosion and warming of permafrost to the atmosphere factors in, except to note that estimates seem to be being upwardly revised: http://environmentalresearchweb.org/cws/article/news/51081

But that didn't stop him: he continued calling — searching for infrastructure that was deteriorating as the permafrost thawed beneath it and for facilities threatened by coastal erosion and flooding — until he and his colleagues had mapped every inch of Alaska's infrastructure and put a price tag on what climate change might do to it.