Sentences with phrase «of seasonal sea ice»

Here we show that a new low ice cover state has appeared from 2007 onwards, which is distinct from the normal state of seasonal sea ice variation, suggesting a bifurcation has occurred from one attractor to two.

Regardless of high uncertainty associated with such an estimate, it does provide a lower bound of the time range for projections of seasonal sea ice cover.»

Variability, trends, and predictability of seasonal sea ice retreat and advance in the Chukchi Sea.

It seems clear that the SSTAs are a function of seasonal sea ice loss at the surface.

During the melt season the albedo of seasonal ice is less than multiyear Seasonal ice absorbs and transmits more sunlight to ocean than multiyear Albedo evolution of seasonal sea ice has 7 phases

Not exact matches

Every year Aleksey Marchenko of The University Center in Svalbard, a Norwegian archipelago north of Scandinavia, leads students across the chilly waters of the Barents Sea to study the seasonal ice pack.

According to the findings, the extent of Arctic sea ice and its seasonal distribution clearly have broad impacts on Arctic climate that extend beyond the Arctic Ocean itself and have important implications for the future of the Arctic system.

This suggests that atmospheric carbon dioxide concentrations of 400 ppm may be sufficient to greatly reduce the spatial extent and seasonal persistence of Arctic sea ice.

«This study was the first to quantitatively elucidate that ice - ocean albedo feedback is a primary driver of seasonal and yearly variations in Arctic sea ice retreat,» says Kay I. Ohshima.

A big «hole» appeared in August in the ice pack in the Beaufort and Chukchi seas, north of Alaska, when thinner seasonal ice surrounded by thicker, older ice melted.

The research is timely given the extreme winter of 2017 - 2018, including record warm Arctic and low sea ice, record - breaking polar vortex disruption, record - breaking cold and disruptive snowfalls in the United States and Europe, severe «bomb cyclones» and costly nor'easter s, said Judah Cohen, director of seasonal forecasting at AER and lead author of the study.

The ice floating on top of the Arctic Ocean and surrounding seas shrinks in a seasonal cycle from mid-March until mid-September.

The team, which includes Professor Baldwin, will lead innovative new research, which aims to advance current understanding of three key conditions that influence seasonal weather across the continent — the North Atlantic upper - ocean heat content, Arctic sea - ice, and the stratosphere.

But «while the Arctic maximum is not as important as the seasonal minimum, the long - term decline is a clear indicator of climate change,» Walt Meier, a sea ice researcher at the NASA Goddard Space Flight Center, said in a statement.

«The combined sea ice data suggest that the seasonal Arctic sea ice cover was strongly reduced during most of the early Holocene and there appear to have been periods of ice free summers in the central Arctic Ocean.

We were particularly interested in the nature of this relationship because of the hypothesized seasonal movement of krill to inshore waters around the Antarctic Peninsula in winter, rapid changes in the climate and sea ice patterns of the Antarctic peninsula [15], [16] and the known relationships between baleen whales and krill.

Seasonal atmospheric responses to reduced Arctic sea ice in an ensemble of coupled model simulations.

The extent of Arctic sea ice reached the maximum area of its seasonal cycle on March 7th coming in at 14.42 million km2.

Continuous annually layered strata provide the best kind of geological archive in which to search for a «golden spike» — these form on the floors of oxygen - starved seas and lakes, in glacial ice, and in corals and trees with seasonal growth rings

Anthony, R., Aster, R., Rowe, C., Wiens, D., Effects of seasonal and secular changes in Antarctic sea ice on microseismic noise, Eos Trans.

The forecast scheme for the September sea ice extent is based on a methodology similar to one used for the seasonal prediction of river streamflow.

For example, few data are available for the polar winter, and it is not known whether aragonite - undersaturated areas decrease in size with the seasonal freezing of sea ice.

Locally, declining sea ice is affecting the feeding and migration patterns of polar bears, whales, walrus and seals, and the people who live in the Arctic and rely on seasonal ice for their livelihoods.

Multi-panel paintings in oil and smaller paintings on canvas and aluminum formats explore the tundra fragmented into puddles and bits of ice with small cascades flowing over the rocks, reminders of accelerated seasonal changes melting ice fields and sea ice.

The sampling issues arise from the fact that sea ice is highly dynamic with lots of spatial and seasonal variability so that measurements from individual moorings, submarine sonar tracks, and aircraft flights can only construct an incomplete picture of the evolution of the total Arctic sea ice volume.

See: Perovich, D. K., T. C. Grenfell, B. Light, and P. V. Hobbs (2002), Seasonal evolution of the albedo of multiyear Arctic sea ice, J. Geophys.

If polar bears have been around for few hundred thousand years they have experienced a variety of environmental changes in the Arctic, including periods when there was more sea ice than present as well as periods when seasonal sea ice was considerably less than at present.

However if we have a similar profile of volume loss as in the preceding two years then random variability looks very unlikely and I'll be veering to the following viewpoint — that something new and radical has happened in the seasonal cycle of sea - ice loss, a new factor that in principle could have the power to make a virtually sea ice free state in September plausible this decade.

Re 9 wili — I know of a paper suggesting, as I recall, that enhanced «backradiation» (downward radiation reaching the surface emitted by the air / clouds) contributed more to Arctic amplification specifically in the cold part of the year (just to be clear, backradiation should generally increase with any warming (aside from greenhouse feedbacks) and more so with a warming due to an increase in the greenhouse effect (including feedbacks like water vapor and, if positive, clouds, though regional changes in water vapor and clouds can go against the global trend); otherwise it was always my understanding that the albedo feedback was key (while sea ice decreases so far have been more a summer phenomenon (when it would be warmer to begin with), the heat capacity of the sea prevents much temperature response, but there is a greater build up of heat from the albedo feedback, and this is released in the cold part of the year when ice forms later or would have formed or would have been thicker; the seasonal effect of reduced winter snow cover decreasing at those latitudes which still recieve sunlight in the winter would not be so delayed).

Without any land, the effects of seasonal cycles are reduced and it is also harder to build up a thick ice sheet (the basal lubrication of sea ice being large).

These result in westerly winds (clockwise around the pole as viewed from below) just above the edge of Antarctica in the region where the seasonal sea ice forms, ie, the west wind drift:

Polar bears have optimal habitat requirements with respect to food supply (seals) and this food supply hinges critically on the seasonal extent of sea ice.

The problem with the ECMWF winter seasonal forecasts has been the specification of climatological sea ice.

In both the Arctic and the Antarctic «natural causes» (the seasons) are responsible for the seasonal decrease / increase in sea ice extent, which are, of course, much larger than the average annual change.

Regions of rapid sea ice change: An inter-hemispheric seasonal comparison.

Seasonal sea ice changes in the Amundsen Sea, Antarctica, over the period of 1979 - 20sea ice changes in the Amundsen Sea, Antarctica, over the period of 1979 - 20Sea, Antarctica, over the period of 1979 - 2014.

As we near the final month of summer in the Northern Hemisphere, NASA scientists are watching the annual seasonal melting of the Arctic sea ice cover.

An overall warming in the 2 × CO2 experiment causes reduction of sea - ice extent by 15 %, with maximum decrease in summer and autumn, consistent with observed seasonal sea - ice changes.

Given the apparent importance of the MDCs in determining the seasonal and interannual variations in sea ice extent, it is very difficult to discriminate a global warming signal from the data because of the short data record.

The Arctic's sea ice pack thawed to its third - lowest summer level on record, up slightly from the seasonal melt of the past two years but continuing an overall decline symptomatic of climate change, U.S. scientists said on Thursday.

Exploitation of improved and novel sea ice information for the initialization and evaluation of weekly - to - seasonal probabilistic sea ice forecasting systems.

Liu, J., M. Song, R. Horton, and Y. Hu, 2015: Revisiting the potential of melt pond fraction as a predictor for the seasonal Arctic sea ice extent minimum.

A map of sea ice extent at the climax of the Last Glacial Maximum (both perennial and seasonal ice), prepared with the help of a colleague, makes it possible to discuss what genetic and fossil evidence can tell us about the probable effects of glacial conditions on polar bears and ringed seals.

I recently gave a talk about the powerful relationships among various co - factors including seasonal sunlight, seasonal temperature change, sea level, and even tectonic activity that extends back to the bipolar Quaternary ice - ages and interglacial warm periods of last 2.6 million years.

«The combined sea ice data suggest that the seasonal Arctic sea ice cover was strongly reduced during most of the early Holocene and there appear to have been periods of ice free summers in the central Arctic Ocean.»

Evidence suggests that the negative phase of the Arctic Oscillation was driven in part by warm air (air warmed by the dramatic seasonal loss of Arctic sea ice) 9 as well as by changes in snow cover over Eurasia driven by climate change.10 This event is part of an emerging trend in which a warming climate may paradoxically bring colder, snowier winters to northern Europe and the eastern United States.11

Much of the Bearded Seal's habitat encompasses seasonal ice zones where first - year sea ice is renewed every winter but melts completely every summer.

This study assesses the ability of the Canadian Seasonal to Interannual Prediction System (CanSIPS) and the Canadian Earth - system Model 2 (CanESM2) to predict and simulate snow and sea ice from seasonal to multi-decadal timescales, with a focus on the CanadianSeasonal to Interannual Prediction System (CanSIPS) and the Canadian Earth - system Model 2 (CanESM2) to predict and simulate snow and sea ice from seasonal to multi-decadal timescales, with a focus on the Canadianseasonal to multi-decadal timescales, with a focus on the Canadian sector.

Improvements in seasonal forecasting practice arising from recent research include accurate initialization of snow and frozen soil, accounting for observational uncertainty in forecast verification, and sea - ice thickness initialization using statistical predictors available in real time.

The Bering Sea, Barents Sea, Baffin Bay, the Sea of Okhotsk, and Hudson Bay are all seasonal ice zones.