Sentences with phrase «ice changes ecosystems»

The loss of sea ice changes ecosystems, opening the door to invasive species, and alters habitat and plankton blooms, affecting Alaska's commercial fishing industry, which leads the United States in the value of its catch.

Not exact matches

Linse and her colleagues» urgent mission is to study seafloor that was in the shadow of the ice before the ecosystem changes.

As the ice rapidly recedes from the Arctic, changes are roiling existing ecosystems and opening new opportunities for migrants.

In response, the U.S. Geological Survey began a study on changing Arctic ecosystems to better understand the consequences of lost permafrost and sea ice habitats, and the Interior Department established a Climate Science Center at the University of Alaska to specifically address Arctic issues.

Ice core data from the poles clearly show dramatic swings in average global temperatures, but researchers still don't know how local ecosystems reacted to the change.

Melting ice and changing ecosystems will pose complicated new questions, says National Research Council

This ongoing ice retreat is spawning a variety of changes in the Arctic ecosystem, from increased parasites in caribou herds to a growth in annual tundra fires in Alaska, according to the assessment in Science last week, which reviews prior data.

Rapidly changing ecosystems are threatening wildlife and the indigenous populations that depend on it, while thawing land and melting ice are shortening shipping routes and opening up new areas for development of fossil fuels and minerals.

Beyond sea ice, Greenland's ice sheet is also melting away and pushing sea levels higher, large fires are much more common and intense in boreal forests and other ecosystem changes are causing the earth to hyperventilate.

Consequences of change and variability in sea ice on marine ecosystem and biogeochemical processes during the 2007 — 2008 Canadian International Polar Year program.

Research Climate warming and the rapidly disappearing Arctic sea ice cover have imposed new variability and likely directional change on the Arctic marine ecosystem.

Climate change is warming the Arctic twice as fast as the rest of the world, melting sea ice to historically low levels and threatening the viability of the region's vibrant ecosystems.

-- Climate impacts: global temperatures, ice cap melting, ocean currents, ENSO, volcanic impacts, tipping points, severe weather events — Environment impacts: ecosystem changes, disease vectors, coastal flooding, marine ecosystem, agricultural system — Government actions: US political views, world - wide political views, carbon tax / cap - and - trade restrictions, state and city efforts — Reducing GHGs: + electric power systems: fossil fuel use, conservation, solar, wind, geothermal, nuclear, tidal, other + transportation sector: conservation, mass transit, high speed rail, air travel, auto / truck (mileage issues, PHEVs, EVs, biofuels, hydrogen) + architectural structure design: home / office energy use, home / office conservation, passive solar, other

For more than a decade, I've been probing changes in Arctic climate and sea ice and their implications for the species that make up northern ecosystems and for human communities there.

Long term and large - scale changes like ice age / interglacials and small - scale and short - term changes like El Nino show what happens to ecosystems in a changing climate.

Given the level of denialism in the face of glacial mass loss, plummeting Arctic summer ice cover, progressive collapse of ice shelves that have been stable for 6000 to 10000 years, northward, upward, and seasonally earlier movements of ecosystems and other phenological changes, increasing Greenland ice melt, and all the other direct observations of global warming, I think denialists will go to their graves believing it can't be happening.

With global GHG emissions and concentrations continuing to increase; with climate change intensifying changes in ecosystems, ice sheet deterioration, and sea level rise; and with fossil fuels providing more than 80 % of the world's energy, the likelihood seems low that cooperative actions will prevent increasingly disruptive climate change over the next several decades.

We focus our syntheses on the changing cryosphere (permafrost, land ice, and sea ice) and the consequences for ecosystems and society.

Relatively rapid degradation of ice - rich permafrost is adversely affecting human infrastructure, altering Arctic ecosystem structure and function, changing the surface energy balance, and has the potential to dramatically impact Arctic hydrological process and increase greenhouse gas emissions.

The most recent report (PDF) on climate science from the U.N.'s Intergovernmental Panel on Climate Change made clear that we still don't know how sensitive the climate system is to CO2, nor what disruptive feedbacks may emerge as ecosystems dry out, ice caps disappear and permafrost melts — all of which potentially could accelerate warming beyond human control.

The environmental changes brought on by ocean acidification could pose a significant threat to Arctic ecosystems that are already facing challenges from changes in sea ice distribution, warming and increased freshwater discharge.

These tipping points could be ice sheets on Greenland and Antarctica melting permanently, global food shortages and widespread crop failures with more extreme weather, rising ocean temperatures and acidity reaching triggering a crash in global coral reef ecosystems, and warming oceans push the release of methane from the sea floor, which could lead to runaway climate change, etc..

«This record is the first evidence that carbon dioxide may be linked with environmental changes, such as changes in the terrestrial ecosystem, distribution of ice, sea level and monsoon intensity.»

The climate change had already affected the seas around Antarctica and is warming some coastal waters.So now both Antarctic Peninsula and West Antarctica Ice sheet are losing ice.For now, the East Antarctic Ice sheet is stable but it will influence on global climate change due to sea ice.In the future there is growing concern about the possible impact of climate change.Is Antarctica gaining ice that meant it will effect to climate change and the ecosystem of the regioIce sheet are losing ice.For now, the East Antarctic Ice sheet is stable but it will influence on global climate change due to sea ice.In the future there is growing concern about the possible impact of climate change.Is Antarctica gaining ice that meant it will effect to climate change and the ecosystem of the regioice.For now, the East Antarctic Ice sheet is stable but it will influence on global climate change due to sea ice.In the future there is growing concern about the possible impact of climate change.Is Antarctica gaining ice that meant it will effect to climate change and the ecosystem of the regioIce sheet is stable but it will influence on global climate change due to sea ice.In the future there is growing concern about the possible impact of climate change.Is Antarctica gaining ice that meant it will effect to climate change and the ecosystem of the regioice.In the future there is growing concern about the possible impact of climate change.Is Antarctica gaining ice that meant it will effect to climate change and the ecosystem of the regioice that meant it will effect to climate change and the ecosystem of the regions?

(5) Global warming, the climate change component that is driven by greenhouse gas increases, is the reason for concern because of its increasing impact on ecosystems and polar ice caps / sea level rise.

A team of international scientists is due to set off for the world's biggest iceberg, fighting huge waves and the encroaching Antarctic winter, in a mission aiming to answer fundamental questions about the impact of climate change in the polar regions.The scientists, led by the British Antarctic Survey (BAS), are trying to reach a newly revealed ecosystem that had been hidden for 120,000 years below the Larsen C ice shelf on the Antarctic peninsula.In July last year, part of the Larsen C ice shelf calved away, forming a huge iceberg - A68 - which is four times bigger than London, and revealing life beneath for the first time.

For instance, oceans absorb heat from the atmosphere and mix with freshwater run - off from melting glaciers and ice caps, which changes ocean chemistry and puts stress on ocean ecosystems.

While the effects of higher temperatures are still poorly understood, scientists are concerned that climate change could have a major impact on weather patterns, the distribution of ice, ecosystems, and ocean currents and sea levels.

report that ocean sediment cores containing an «undisturbed history of the past» have been analyzed for variations in PP over timescales that include the Little Ice Age... they determined that during the LIA the ocean off Peru had «low PP, diatoms and fish,» but that «at the end of the LIA, this condition changed abruptly to the low subsurface oxygen, eutrophic upwelling ecosystem that today produces more fish than any region of the world's oceans... write that «in coastal environments, PP, diatoms and fish and their associated predators are predicted to decrease and the microbial food web to increase under global warming scenarios,» citing Ito et al..

Advancing the knowledge on the effects of sea ice deformations on upper ocean stratification and ecosystem will have profound implications on our ability to forecast ongoing changes in Arctic Ocean.

Leads opening in the ice will change the fluxes of heat and light penetration through the sea surface and the lower trophic levels of the marine ecosystem.

Rapidly receding summer sea ice, shrinking glaciers, and thawing permafrost cause damage to infrastructure and major changes to ecosystems.

It is unprecedented in its scale and scope, and examines evidence of changes in ocean temperature and ecosystems, rising acidification and methane levels, and massive shrinkage of the polar ice caps.

Ocean acidification, rising ocean temperatures, declining sea ice, and other environmental changes interact to affect the location and abundance of marine fish, including those that are commercially important, those used as food by other species, and those used for subsistence.16, 17,18,122,19,20,21 These changes have allowed some near - surface fish species such as salmon to expand their ranges northward along the Alaskan coast.124, 125,126 In addition, non-native species are invading Alaskan waters more rapidly, primarily through ships releasing ballast waters and bringing southerly species to Alaska.5, 127 These species introductions could affect marine ecosystems, including the feeding relationships of fish important to commercial and subsistence fisheries.

Posted in Adaptation, Biodiversity, Development and Climate Change, Ecosystem Functions, Environment, Glaciers, International Agencies, Land, Lessons, Research, River, Vulnerability, Water Comments Off on In Sign of Warming, 1,600 Years of Ice in Andes Melted in 25 Years

Scientists have recently observed major changes in these glaciers: several have broken up at the ocean end (the terminus), and many have doubled the speed at which they are retreating.2, 5 This has meant a major increase in the amount of ice and water they discharge into the ocean, contributing to sea - level rise, which threatens low - lying populations.2, 3,5 Accelerated melting also adds freshwater to the oceans, altering ecosystems and changing ocean circulation and regional weather patterns.7 (See Greenland ice sheet hotspot for more information.)

All four of us have dedicated our scientific careers to understand the processes and impacts of climate change, variously studying ocean systems, tropical cyclones, ice sheets and ecosystems as well as impacts on human societies.

SEARCH Science Brief: Climate Change and the Permafrost Carbon Feedback SEARCH Science Brief: A Warming Arctic Threatens Rural Community Resilience SEARCH Science Brief: Effects of the Arctic Meltdown on U.S. Weather Patterns SEARCH Science Brief: Rapid Arctic Environmental Change Disrupts Marine Ecosystems SEARCH Science Brief: Disappearing Sea Ice Fuels Greenland Melt SEARCH Science Brief: Diminishing Arctic Sea Ice SEARCH Science Brief: Arctic Land Ice is Decreasing

Very large sea - level rises that would result from widespread deglaciation of Greenland and West Antarctic ice sheets imply major changes in coastlines and ecosystems, and inundation of low - lying areas, with greatest effects in river deltas.

It is increasingly clear that this rich ecosystem affects the melt rates of polar ice and snow and could be accelerating climate change.

Wang, M. Ikeda, K. Mizobata, and J. Overland, Abrupt climate changes and emerging ice - ocean processes in the Pacific Arctic region and the Bering Sea, Chapter 4, in The Pacific Arctic Region: Ecosystem Status and Trends in a Rapidly Changing Environment, J. M. Grebmeier and W. Maslowski (eds.)

He also studies the impact of changes in sea ice on marine planktonic ecosystems by developing biophysical models such as the coupled Biology - Ice - Ocean Modeling and Assimilation System (BIOMAice on marine planktonic ecosystems by developing biophysical models such as the coupled Biology - Ice - Ocean Modeling and Assimilation System (BIOMAIce - Ocean Modeling and Assimilation System (BIOMAS).

Other data sets such as ocean heat content, sea ice extent, whatever, are not sufficiently mature or long - range... Further, the surface temperature is most relevant to climate change impacts, since humans and land ecosystems live on the surface.»

There are three groups of tipping elements: melting ice bodies, changing circulations of the ocean and atmosphere, and threatened large - scale ecosystems.

Among numerous expeditions by icebreakers and other research vessels to the northern Bering Sea and Strait, the Chukchi Sea, and other Arctic regions [272] is the Western Arctic Shelf - Basin Interactions Project in 2002 - 2008, which assessed the effects of variability in sea ice cover and hydrography on the marine ecosystem and the impacts of climate change.

For the ice sheets the answer is probably no (but experts on the subject might have a better idea), but for the overturning circulation or the ecosystem changes, the answer is probably yes — i.e. a slower rate of warming could lead to a different response (allowing time for ocean mixing to mitigate the effects, or adaptation of species to the new conditions).

In the Arctic, the rate of climate change is now faster than ecosystems can adapt to naturally, and the fate of many Arctic marine ecosystems is clearly connected to that of the sea ice (Duarte, Lenton et al., 2012).

The observed effects of cryosphere reduction include modification of river regimes due to enhanced glacial melt, snowmelt advance and enhanced winter base flow; formation of thermokarst terrain and disappearance of surface lakes in thawing permafrost; decrease in potential travel days of vehicles over frozen roads in the Arctic; enhanced potential for glacier hazards and slope instability due to mechanical weakening driven by ice and permafrost melting; regional ocean freshening; sea - level rise due to glacier and ice sheet shrinkage; biotic colonisation and faunal changes in deglaciated terrain; changes in freshwater and marine ecosystems affected by lake - ice and sea - ice reduction; changes in livelihoods; reduced tourism activities related to skiing, ice climbing and scenic activities in cryospheric areas affected by degradation; and increased ease of ship transportation in the Arctic.

Posted in Advocacy, Biodiversity, Development and Climate Change, Ecosystem Functions, Global Warming, Information and Communication, Lessons, Research Comments Off on Climate Change Led To Decline Of Ice Age Trees: Study

This sea ice retreat has significant effects on high - latitude ecosystems and on the evolution of climate change itself, through the change of Earth surface's reflectivity.