And scientists from NASA recently flew a series of missions over the Arctic during the IceBridge project, to study details of Arctic
sea ice thickness as well as changing glaciers in Greenland.
Not exact matches
AWI researchers observed a considerable decrease in the
thickness of the
sea ice as early
as the late summer of 2015, even though the overall
ice covered area of the September minimum ultimately exceeded the record low of 2012 by approximately one million square kilometres.
Regarding my # 74: On
sea ice thickness, here is an unreviewed but sensible discussion / analysis of Arctic
sea ice volume and
thickness as modeled by PIOMAS.
However,
sea ice then grows very rapidly, since the growth rate for thin
ice is much higher than for thick
ice, which acts
as a negative feedback on
thickness during the growth season (Bitz and Roe, 2004; Notz, 2009).
This depends upon both the
thickness of the
ice,
as well
as the depression below
sea level.
The
sea ice component represents
sea ice in multiple categories of
thickness and accounts for changes in
thickness due to growth and melt
as well
as mechanical deformation of
ice (Thorndike et al. 1975, Hibler 1980).
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.
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.
Canadian
Ice Service, 4.7, Multiple Methods As with CIS contributions in June 2009, 2010, and 2011, the 2012 forecast was derived using a combination of three methods: 1) a qualitative heuristic method based on observed end - of - winter arctic ice thicknesses and extents, as well as an examination of Surface Air Temperature (SAT), Sea Level Pressure (SLP) and vector wind anomaly patterns and trends; 2) an experimental Optimal Filtering Based (OFB) Model, which uses an optimal linear data filter to extrapolate NSIDC's September Arctic Ice Extent time series into the future; and 3) an experimental Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and sea ice predicto
Ice Service, 4.7, Multiple Methods
As with CIS contributions in June 2009, 2010, and 2011, the 2012 forecast was derived using a combination of three methods: 1) a qualitative heuristic method based on observed end - of - winter arctic ice thicknesses and extents, as well as an examination of Surface Air Temperature (SAT), Sea Level Pressure (SLP) and vector wind anomaly patterns and trends; 2) an experimental Optimal Filtering Based (OFB) Model, which uses an optimal linear data filter to extrapolate NSIDC's September Arctic Ice Extent time series into the future; and 3) an experimental Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and sea ice predictor
As with CIS contributions in June 2009, 2010, and 2011, the 2012 forecast was derived using a combination of three methods: 1) a qualitative heuristic method based on observed end - of - winter arctic
ice thicknesses and extents, as well as an examination of Surface Air Temperature (SAT), Sea Level Pressure (SLP) and vector wind anomaly patterns and trends; 2) an experimental Optimal Filtering Based (OFB) Model, which uses an optimal linear data filter to extrapolate NSIDC's September Arctic Ice Extent time series into the future; and 3) an experimental Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and sea ice predicto
ice thicknesses and extents,
as well as an examination of Surface Air Temperature (SAT), Sea Level Pressure (SLP) and vector wind anomaly patterns and trends; 2) an experimental Optimal Filtering Based (OFB) Model, which uses an optimal linear data filter to extrapolate NSIDC's September Arctic Ice Extent time series into the future; and 3) an experimental Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and sea ice predictor
as well
as an examination of Surface Air Temperature (SAT), Sea Level Pressure (SLP) and vector wind anomaly patterns and trends; 2) an experimental Optimal Filtering Based (OFB) Model, which uses an optimal linear data filter to extrapolate NSIDC's September Arctic Ice Extent time series into the future; and 3) an experimental Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and sea ice predictor
as an examination of Surface Air Temperature (SAT),
Sea Level Pressure (SLP) and vector wind anomaly patterns and trends; 2) an experimental Optimal Filtering Based (OFB) Model, which uses an optimal linear data filter to extrapolate NSIDC's September Arctic Ice Extent time series into the future; and 3) an experimental Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and sea ice predicto
Sea Level Pressure (SLP) and vector wind anomaly patterns and trends; 2) an experimental Optimal Filtering Based (OFB) Model, which uses an optimal linear data filter to extrapolate NSIDC's September Arctic
Ice Extent time series into the future; and 3) an experimental Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and sea ice predicto
Ice Extent time series into the future; and 3) an experimental Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and
sea ice predicto
sea ice predicto
ice predictors.
Canadian
Ice Service, 4.7 (+ / - 0.2), Heuristic / Statistical (same as June) The 2015 forecast was derived by considering a combination of methods: 1) a qualitative heuristic method based on observed end - of - winter Arctic ice thickness extents, as well as winter Surface Air Temperature, Sea Level Pressure and vector wind anomaly patterns and trends; 2) a simple statistical method, Optimal Filtering Based Model (OFBM), that uses an optimal linear data filter to extrapolate the September sea ice extent timeseries into the future and 3) a Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and sea ice predicto
Ice Service, 4.7 (+ / - 0.2), Heuristic / Statistical (same
as June) The 2015 forecast was derived by considering a combination of methods: 1) a qualitative heuristic method based on observed end - of - winter Arctic
ice thickness extents, as well as winter Surface Air Temperature, Sea Level Pressure and vector wind anomaly patterns and trends; 2) a simple statistical method, Optimal Filtering Based Model (OFBM), that uses an optimal linear data filter to extrapolate the September sea ice extent timeseries into the future and 3) a Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and sea ice predicto
ice thickness extents,
as well
as winter Surface Air Temperature,
Sea Level Pressure and vector wind anomaly patterns and trends; 2) a simple statistical method, Optimal Filtering Based Model (OFBM), that uses an optimal linear data filter to extrapolate the September sea ice extent timeseries into the future and 3) a Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and sea ice predicto
Sea Level Pressure and vector wind anomaly patterns and trends; 2) a simple statistical method, Optimal Filtering Based Model (OFBM), that uses an optimal linear data filter to extrapolate the September
sea ice extent timeseries into the future and 3) a Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and sea ice predicto
sea ice extent timeseries into the future and 3) a Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and sea ice predicto
ice extent timeseries into the future and 3) a Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and
sea ice predicto
sea ice predicto
ice predictors.
Currently, the NASA IceBridge mission supplies both
sea ice thickness and snow depth measurements in spring, providing timely information on the state of the
ice cover
as the melt season begins.
Radar
ice -
thickness estimates of the Arctic
Sea ice showed that it had been thinning for years, just
as they had also shown that the northern coastal glaciers of Greenland were thinning.
In addition, Sentinel - 3B will
as well measure
sea ice thickness and significant wave heights, the latter will be assimilated into MET Norway's wave forecast model, also a contribution to the Copernicus Marine Services.
The pan-arctic ensemble runs with a coupled
ice - ocean model by Kauker et al. also indicate a distinct
ice thickness anomaly in the East Siberian
Sea, where
thicknesses at the end of June 2010 are shown to be higher by a factor of roughly two
as compared to the previous three years.
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.
Given the annual cycle of melting and refreezing for the majority of
sea ice,
thickness is not relevent
as it would dissapear and re-appear annually.
Further investigation of
ice thickness and free
ice drift conditions, in addition to persistence of SLP maxima, will provide further insight
as to whether convergence (divergence) of
sea ice associated with SLP highs (lows) will give rise to increased ice retreat in the Arctic and the Beaufort Sea region in particul
sea ice associated with SLP highs (lows) will give rise to increased
ice retreat in the Arctic and the Beaufort
Sea region in particul
Sea region in particular.
Kaleschke and Tian - Kunze, 3.6 (± 0.7), Heuristic / Statistical (same
as June) Based on February / March SMOS
sea ice thickness and September SSMI
sea ice concentration we provide a heuristic / statistical guesstimate for the 2015 September
sea ice extent: 3.6 (± 0.7) million km2.
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).
Canadian
Ice Service, 4.7 (± 0.2), Heuristic / Statistical (same as June) The 2015 forecast was derived by considering a combination of methods: 1) a qualitative heuristic method based on observed end - of - winter Arctic ice thickness extents, as well as winter Surface Air Temperature, Sea Level Pressure and vector wind anomaly patterns and trends; 2) a simple statistical method, Optimal Filtering Based Model (OFBM), that uses an optimal linear data filter to extrapolate the September sea ice extent timeseries into the future and 3) a Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and sea ice predicto
Ice Service, 4.7 (± 0.2), Heuristic / Statistical (same
as June) The 2015 forecast was derived by considering a combination of methods: 1) a qualitative heuristic method based on observed end - of - winter Arctic
ice thickness extents, as well as winter Surface Air Temperature, Sea Level Pressure and vector wind anomaly patterns and trends; 2) a simple statistical method, Optimal Filtering Based Model (OFBM), that uses an optimal linear data filter to extrapolate the September sea ice extent timeseries into the future and 3) a Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and sea ice predicto
ice thickness extents,
as well
as winter Surface Air Temperature,
Sea Level Pressure and vector wind anomaly patterns and trends; 2) a simple statistical method, Optimal Filtering Based Model (OFBM), that uses an optimal linear data filter to extrapolate the September sea ice extent timeseries into the future and 3) a Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and sea ice predicto
Sea Level Pressure and vector wind anomaly patterns and trends; 2) a simple statistical method, Optimal Filtering Based Model (OFBM), that uses an optimal linear data filter to extrapolate the September
sea ice extent timeseries into the future and 3) a Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and sea ice predicto
sea ice extent timeseries into the future and 3) a Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and sea ice predicto
ice extent timeseries into the future and 3) a Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and
sea ice predicto
sea ice predicto
ice predictors.
As noted last month, this range depends in part on the relative weight that the respondents give to «initial conditions,» e.g., age and thickness of sea ice at the end of spring, versus whether summer winds in 2008 will be as supportive for ice loss as the favorable winds were in 200
As noted last month, this range depends in part on the relative weight that the respondents give to «initial conditions,» e.g., age and
thickness of
sea ice at the end of spring, versus whether summer winds in 2008 will be
as supportive for ice loss as the favorable winds were in 200
as supportive for
ice loss
as the favorable winds were in 200
as the favorable winds were in 2007.
The findings are based on satellite readings of Antarctic
sea ice movement and
thickness,
as well
as new, detailed interpretations of charts showing the shape of the
sea bottom around Antarctica.
As a result of limited satellite observations of
sea ice thickness (for more information: Sea Ice Thickness Data Sets: Overview and Comparison), few climate modeling experiments have isolated the role of changing sea ice thickne
sea ice thickness (for more information: Sea Ice Thickness Data Sets: Overview and Comparison), few climate modeling experiments have isolated the role of changing sea ice thickne
ice thickness (for more information: Sea Ice Thickness Data Sets: Overview and Comparison), few climate modeling experiments have isolated the role of changing sea ice t
thickness (for more information:
Sea Ice Thickness Data Sets: Overview and Comparison), few climate modeling experiments have isolated the role of changing sea ice thickne
Sea Ice Thickness Data Sets: Overview and Comparison), few climate modeling experiments have isolated the role of changing sea ice thickne
Ice Thickness Data Sets: Overview and Comparison), few climate modeling experiments have isolated the role of changing sea ice t
Thickness Data Sets: Overview and Comparison), few climate modeling experiments have isolated the role of changing
sea ice thickne
sea ice thickne
ice thicknessthickness.
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).
The modeled evolution of Arctic
sea ice volume appears to be much stronger correlated with changes in
ice thickness than with
ice extent
as it shows a similar negative trend beginning around the mid-1990s.
Arctic
sea ice extent and
thickness have declined substantially, especially in late summer (September), when there is now only about half
as much
sea ice as at the beginning of the satellite record in 1979 (Ch.
However,
as you'll see by the
sea ice thickness maps below, there may be good reason for the lack of ringed seal lairs, and a general lack of seals except at the nearshore lead that forms because of tidal action: the
ice just a bit further offshore
ice looks too thick for a good crop of ringed seals in all three years of the study.
As with previous CIS contributions, the 2016 forecast was derived by considering a combination of methods: 1) a qualitative heuristic method based on observed end - of - winter Arctic ice thickness / extent, as well as winter surface air temperature, spring ice conditions and the summer temperature forecast; 2) a simple statistical method, Optimal Filtering Based Model (OFBM), that uses an optimal linear data filter to extrapolate the September sea ice extent time - series into the future and 3) a Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and sea ice predictor
As with previous CIS contributions, the 2016 forecast was derived by considering a combination of methods: 1) a qualitative heuristic method based on observed end - of - winter Arctic
ice thickness / extent,
as well as winter surface air temperature, spring ice conditions and the summer temperature forecast; 2) a simple statistical method, Optimal Filtering Based Model (OFBM), that uses an optimal linear data filter to extrapolate the September sea ice extent time - series into the future and 3) a Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and sea ice predictor
as well
as winter surface air temperature, spring ice conditions and the summer temperature forecast; 2) a simple statistical method, Optimal Filtering Based Model (OFBM), that uses an optimal linear data filter to extrapolate the September sea ice extent time - series into the future and 3) a Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and sea ice predictor
as winter surface air temperature, spring
ice conditions and the summer temperature forecast; 2) a simple statistical method, Optimal Filtering Based Model (OFBM), that uses an optimal linear data filter to extrapolate the September
sea ice extent time - series into the future and 3) a Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and
sea ice predictors.
Any field - or ship - based updates on
ice conditions in the different regions such
as sea ice morphology (e.g., concentration,
ice type, floe size,
thickness, snow cover, melt pond characteristics, topography), meteorology (surface measurements) and oceanography (e.g., temperature, salinity, upper ocean temperature).
She says improved summer weather predictions
as well
as satellite measurements of
sea ice thickness and concentration could help forecasting.
April 1, 2009
Sea ice cover over the Arctic Ocean typically reaches its maximum geographic extent and
thickness just
as spring begins in the Northern Hemisphere.
There is some evidence that the Arctic
sea -
ice cover has decreased about 6 % during the last two decades, and that the mean
ice thickness has decreased
as well.
As such, monitoring Arctic
ice thickness may be useful for predicting rapid changes in
sea ice.
As surface temperture is altitude dependent one might have thought the first thing to check would be a map, as the arctic ice lies at sea level + 9 % of its thickness, while the antarctic ice sits several kilometers high in the sky, and the surrounding apron of the stuff is immune to windage because of the circumpolar continent in its mids
As surface temperture is altitude dependent one might have thought the first thing to check would be a map,
as the arctic ice lies at sea level + 9 % of its thickness, while the antarctic ice sits several kilometers high in the sky, and the surrounding apron of the stuff is immune to windage because of the circumpolar continent in its mids
as the arctic
ice lies at
sea level + 9 % of its
thickness, while the antarctic
ice sits several kilometers high in the sky, and the surrounding apron of the stuff is immune to windage because of the circumpolar continent in its midst.
The time constants of albedo feedback from melting N America snow cover are shorter than the albedo feedback from melting Arctic
sea ice, and the
sea ice is changing response
as its average
thickness decreases, and the ratios of 1, 2, 3, 4, 5 year
ice area changes.
Stroeve said that
sea ice volume, which incorporates measurements of
ice extent
as well
as thickness, is a more important metric than
sea ice extent alone.
Nevertheless it should be readily apparent to all and sundry by now that the
thickness of Arctic
sea ice has been declining at the same time
as its extensiveness.
Relating the age of Arctic
sea ice to its
thickness,
as measured during NASA's ICESat and IceBridge campaigns.