Sentences with phrase «sea ice thickness from»

Sea ice thickness from the ESA CryoSat - 2 altimeter, provided by NSIDC and Nathan Kurtz at the NASA Goddard Space Flight Center.

While sea ice thickness observations are sparse, here we utilize the ocean and sea ice model, PIOMAS (Zhang and Rothrock, 2003), to visualize mean sea ice thickness from 1979 to 2018.

Over the sea ice field the observations include: sea ice freeboard height and hence sea ice thickness from radar altimetry; sea ice surface temperature and sea ice drift from respectively infrared radiometer and imaging spectrometer under cloud free conditions.

ICESat - 2 will add to our understanding of Arctic sea ice by measuring sea ice thickness from space, providing scientists more complete information about the volume of sea ice in the Arctic and Southern oceans.

Not exact matches

the south - bound expedition had cleared that vast plain of floating ice which flows down from the great mountains of the interior and covers the southern part of Ross Sea throughout an area above 20,000 square miles with an ice sheet approximately 800 feet in thickness, and had begun to climb the heights which form the mountainous embayment at the head of Ross Sea.

After compiling 10 floe - scale maps of the ice from the Weddell, Bellingshausen, and the Wilkes Land regions of the continent, the researchers found that the sea ice thickness tended to be highly variable, with many ridges and valleys, they report online today in Nature Geoscience.

Researchers from Norway and China have collaborated on developing an autonomous buoy with instruments that can more precisely measure the optical properties of Arctic sea ice while also taking measurements of ice thickness and temperature.

Rising polar temperatures caused the average thickness of winter Arctic sea ice to decrease from about 12 feet to 6 feet between 1978 and 2008, and thinner ice melts more readily.

From an altitude of just over 700 km, CryoSat will precisely monitor changes in the thickness of sea ice and variations in the thickness of the ice sheets on land.

First, we expect the ice thickness distribution in April 30 from redistribution (divergence / convergence) of sea ice during December and April, based on the daily ice velocity data.

Finnish Meteorological Institute has been doing estimates of two essential sea ice parameters — namely, sea ice concentration (SIC) and sea ice thickness (SIT)-- for the Bohai Sea using a combination of a thermodynamic sea ice model and Earth observation (EO) data from synthetic aperture radar (SAR) and microwave radiometsea ice parameters — namely, sea ice concentration (SIC) and sea ice thickness (SIT)-- for the Bohai Sea using a combination of a thermodynamic sea ice model and Earth observation (EO) data from synthetic aperture radar (SAR) and microwave radiometsea ice concentration (SIC) and sea ice thickness (SIT)-- for the Bohai Sea using a combination of a thermodynamic sea ice model and Earth observation (EO) data from synthetic aperture radar (SAR) and microwave radiometsea ice thickness (SIT)-- for the Bohai Sea using a combination of a thermodynamic sea ice model and Earth observation (EO) data from synthetic aperture radar (SAR) and microwave radiometSea using a combination of a thermodynamic sea ice model and Earth observation (EO) data from synthetic aperture radar (SAR) and microwave radiometsea ice model and Earth observation (EO) data from synthetic aperture radar (SAR) and microwave radiometer.

So what we need is detailed topo maps of the bed and thickness of the GIS, and to work out a map of the «net buoyancy», or some such (i.e. total ice area density subtracted from the area density of a hypothetical column of water resting on the bed and extending up to sea level).

Miller, P. A., S. W. Laxon, and D. L. Feltham (2007), Consistent and contrasting decadal Arctic sea ice thickness predictions from a highly optimized sea ice model, J. Geophys.

The team, which Marc led and provided the logistical support for, deployed from Resolute to Nord Greenland before setting up a rustic field camp on the sea ice for six days, during which time we mechanically drilled the ice to measure thickness, measuring snow depth in a grid pattern along the flight lines as well as dragging instruments along the surface that produced the same measurements for comparison to the airborne data.

The goal, the scientists say, is to compare independent methods of gauging ice trends from factors including sea temperature, ice thickness and cycles of atmospheric pressure and winds around the Arctic.

The researchers also found no predictive value in seeking insights from trends in conditions like sea - ice thickness.

And variations in the thickness and extent of sea ice cloaking the Arctic Ocean are driven by yet another set of complicating factors, ranging from long - term shifts in atmospheric pressure patterns to events as close - focus as the potent Arctic superstorm I reported on earlier this month.

If this thinning would have eliminated ice from areas observed to have sea ice, a minimum thickness of 20 cm was left in place for the ice initial condition.

Snow depth and ice thickness measurements from the Beaufort and Chukchi Seas collected during the AMSR - Ice03 campaign.

Variability of Arctic sea ice thickness and volume from CryoSat - 2.

Corrigendum to «Using records from submarine, aircraft and satellites to evaluate climate model simulations of Arctic sea ice thickness» published in The Cryosphere, 8, 1839 - 1854, 2014.

Varying thicknesses of sea ice are shown here, from thin, nearly transparent layers to thicker, older sea ice covered with snow.

Advance methods to produce freeboard and sea ice thickness profiles from radar altimeter (RA) data.

Stéphanie Jenouvrier, a biologist at the Woods Hole Oceanographic Institution in the US, and colleagues from France and the Netherlands report in Nature Climate Change that changes in the extent and thickness of sea ice will create serious problems for a flightless, streamlined, survival machine that can live and even breed at minus 40 °C, trek across 120 kilometres of ice, and dive to depths of more than 500 metres.

The empirical evidence from the past two decades reveals that declining sea ice cover and thickness have been great enough to enhance Arctic warming during most of the year.

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.

A new ensemble prediction from an ice - ocean model was submitted by Zhang for the July outlook and the new sea ice thickness map for September 2010 still shows ice remaining in Lancaster Sound.

If this thinning would have eliminated ice from areas observed to have sea ice, a minimum thickness of 20 cm was left in place.

Further: We calculate Arctic sea ice thickness and volume values from the standard, publically available CryoSat data as well as from near real time (NRT) CryoSat data provided directly to us from the European Space Agency.

The latest reports from the Chukchi Sea (see contribution by J. Hutchings summarizing ship observations) estimate the thickness of level first - year ice at between 1 and 1.2 meters (i.e., relatively thick).

Reasoning for a decrease in sea ice extent from recent years, perhaps approaching new record - low minimum, focuses on the below - normal sea ice thickness overall, the thinning of sea ice in coastal seas, rotting of old multi-year sea ice, warm temperatures in April and May 2010, and the rapid loss of sea ice area seen during May.

However, our monthly sea ice volumes calculated from NRT and standard data agree to within 0.5 % on average, which shows that the NRT data allow us provide users with a reliable operational thickness and volume product.

THERE HAS BEEN A WARMING TREND FROM THE 70s THRU THE LATE 90s,... accompanied by other changes tied to a warming trend (record low arctic sea ice extent & thickness, retreating glaciers, retreating snow lines, warming ocean surface temps, increases in sea height, de-alkalinizing oceans).

Going back even farther, I. V. Polyakov and others examined Russian historical records of Arctic sea ice extent and thickness starting from the year 1900.

``... examination of records of fast ice thickness and ice extent from four Arctic marginal seas (Kara, Laptev, East Siberian, and Chukchi) indicates that long - term trends are small and generally statistically insignificant, while trends for shorter records are not indicative of the long - term tendencies due to strong low - frequency variability in these time series, which places a strong limitation on our ability to resolve long - term trends....

The ensemble consists of seven members each of which uses a unique set of NCEP / NCAR atmospheric forcing fields from recent years, representing recent climate, such that ensemble member 1 uses 2005 NCEP / NCAR forcing, member 2 uses 2006 forcing..., and member 7 uses 2011 forcing... In addition, the recently available IceBridge and helicopter - based electromagnetic (HEM) ice thickness quicklook data are assimilated into the initial 12 - category sea ice thickness distribution fields in order to improve the initial conditions for the predictions.

To make use of that potential we would need good estimates of sea ice thickness, such as might be obtained from ICESat or CryoSat (i.e., complete spatial coverage).

In an earlier study (Labe et al., 2018a), we show that the CESM - LENS sea ice thickness compares well with satellite observations and output from an ice - ocean model.

(left) Ensemble prediction of September 2013 sea ice thickness in the Northwest Passage region from the PIOMAS model.

Overall, we find the loss of sea ice thickness contributes up to 1/3 of the response from loss of sea ice concentration in the lower to mid-atmosphere.

As in 2012, sea ice thinning and not just anomalous weather should contribute to September 2013 sea ice loss (see the discussion of the IceBridge sea ice thickness data from the June Report).

Maslowski is highly regarded, in part because his position at the American Naval Postgraduate School has given him unique access to half a century of Arctic sea - ice thickness scans from sub-polar US military submarines.

Arctic sea ice end - of - summer minimum area, although variable from year to year, has plummeted by more than a third in the past few decades, at a faster rate than in most models [21], with the sea ice thickness declining a factor of four faster than simulated in IPCC climate models [22].

Is it your contention that the thickness of fast ice on these sea shores is the same from year to year?

NASA Icebridge - Snow depth and sea ice thickness data from the Quick Look data product.

In response to your question I would refer you to my comment above Dave Wendt (14:39:39): where I discuss the Rigor and Wallace paper of 2004 which demonstrated that the decline in sea ice age and thickness began with a shift in state in Beaufort Gyre and the TransPolar Drift in 1989 which resulted in multiyear ice declining from over 80 % of the Arctic to 30 % in about one year and that the persistence of that pattern has been responsible for the continuing decline.

We usually focus on summer because that's the most dramatic, but now the winter is starting to respond,» said Stroeve, who just returned from an Arctic expedition where she measured sea - ice thickness.

From the atmospheric temperature rise to the acidification of the sea, from ice thickness and extent to sea levels, we really need to continue to know what is goingFrom the atmospheric temperature rise to the acidification of the sea, from ice thickness and extent to sea levels, we really need to continue to know what is goingfrom ice thickness and extent to sea levels, we really need to continue to know what is going on.

CryoSat was launched in 2010 to measure sea - ice thickness in the Arctic, but data from the Earth - observing satellite have also been exploited for other studies.

The NSIDC is also facing hot competition from the British Catlin Arctic Survey, which employs good old - fashioned Arctic explorers to do, we are told, what satellites can not, which is to measure the thickness of Arctic sea ice.