Not exact matches
A new University of Washington study, with funding and satellite
data from NASA and other agencies, finds a
trend toward earlier
sea ice melt in the spring and later
ice growth in the fall across all 19 polar bear populations, which can negatively impact the feeding and breeding capabilities of the bears.
Scientists at the National Snow and
Ice Data Center (NSIDC), University College London, University of New Hampshire and University of Washington analyzed 300 summer Arctic sea ice forecasts from 2008 to 2013 and found that forecasts are quite accurate when sea ice conditions are close to the downward trend that has been observed in Arctic sea ice for the last 30 yea
Ice Data Center (NSIDC), University College London, University of New Hampshire and University of Washington analyzed 300 summer Arctic
sea ice forecasts from 2008 to 2013 and found that forecasts are quite accurate when sea ice conditions are close to the downward trend that has been observed in Arctic sea ice for the last 30 yea
ice forecasts from 2008 to 2013 and found that forecasts are quite accurate when
sea ice conditions are close to the downward trend that has been observed in Arctic sea ice for the last 30 yea
ice conditions are close to the downward
trend that has been observed in Arctic
sea ice for the last 30 yea
ice for the last 30 years.
The
trends revealed by the
data were clear: The average albedo in the northern area of the Arctic Ocean, including open water and
sea ice, is declining in all summer months (May - August).
Comiso and other climate scientists reject the suggestion that his
data set may overestimate the recent
trend in Antarctic
sea -
ice growth — by as much as two - thirds, according to Eisenman's analysis.
The authors of a new study reviewing the volume
data, detailed on Monday in the journal Nature Geoscience, are quick to caution, though, that one single year of rebound doesn't suggest any
sea ice recovery, as the overall
trend is still downward.
Further signs of this warming
trend can be seen in the Northern Hemisphere
Sea Ice Extent from the National Snow and
Ice Data Center.
Clearly, the
sea ice volume
data plot is the single most important topic of discussion, yet in the article it is shown in Figure 1 with a poor vertical scale and amongst linear
trend lines which mislead and make the curve appear to be linear and reach the zero point far out in the future.
If you plot the average Arctic
Sea Ice extent for 20 years, the you should also plot the monthly maximum and minimum values on the same figure so that we can get some perspective on where the 2007 and 2008
data falls in the context of annual variability, or examine for
trends.
Comiso and other climate scientists reject the suggestion that his
data set may overestimate the recent
trend in Antarctic
sea -
ice growth — by as much as two - thirds, according to Eisenman's analysis.
Updated, July 23, 1:40 p.m. A new study of methods used to track Antarctic
sea ice trends has raised important questions about whether recent increases in
ice there are, to a significant extent, an illusion created by flawed analysis of
data collected by a series of satellites.
Another NASA
sea -
ice data set, processed using the other standard algorithm, shows a growth
trend similar to that in Comiso's current
data.
Figure 3: National Snow and
Ice Data Center (NSIDC) Antarctic, Arctic, and global (sum of the two) sea ice extents with linear tren
Ice Data Center (NSIDC) Antarctic, Arctic, and global (sum of the two)
sea ice extents with linear tren
ice extents with linear
trends.
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 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 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.
Thus, the
data indicate a continued
trend towards flushing of old multiyear
ice out of Canadian Basin into the Beaufort and Chukchi
Seas.
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.
When sceptics look at statistical
data, whether it is recent
ice melt, deep
sea temperatures, current
trend in global surface temperatures, troposphere temperatures,
ice core records etc. they look at the
data as it is without any pre-conceptions and describe what it says.
However, currently both modern and paleo
data - model intercomparisons display large differences in
sea -
ice extent and
trends.
Updating this analysis using observational
data through 2011 (not even including the 2012 record low
sea ice extent), the 32 - year
trend (1979 - 2011) is -530 thousand square km per decade, and the 20 - year
trend is -700 thousand square km per decade.
Since current
ice melt
data could indicate variable climate
trends and aren't necessarily part of an accelerating
trend, the study warned that predictions of future
sea - level rise should not be based on measurements of glacial loss» Daily Mail.
[3] An implementation of the diff - of - gaussian filter is presented here: https://climategrog.wordpress.com/2016/09/18/diff-of-gaussian-filter/ [4] The
sea -
ice area
data used in the decadal
trend analysis are provided by Cryosphere Today team at U. Illinois.
This is an important article, Climategrog, because it shows from a different type of
data (date of minimum extent) that something happened around 2007 to Arctic
sea ice that interrupted a 35 year
trend.
Canadian
Ice Service; 5.0; Statistical As with Canadian Ice Service (CIS) contributions in June 2009 and June 2010, the 2011 forecast was derived using a combination of three methods: 1) a qualitative heuristic method based on observed end - of - winter Arctic Multi-Year Ice (MYI) 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; 5.0; Statistical As with Canadian
Ice Service (CIS) contributions in June 2009 and June 2010, the 2011 forecast was derived using a combination of three methods: 1) a qualitative heuristic method based on observed end - of - winter Arctic Multi-Year Ice (MYI) 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 (CIS) contributions in June 2009 and June 2010, the 2011 forecast was derived using a combination of three methods: 1) a qualitative heuristic method based on observed end - of - winter Arctic Multi-Year
Ice (MYI) 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 (MYI) 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
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.
Actually Fielding's use of that graph is quite informative of how denialist arguments are framed — the selected bit of a selected graph (and don't mention the fastest warming region on the planet being left out of that
data set), or the complete passing over of short term variability vs longer term
trends, or the other measures and indicators of climate change from ocean heat content and
sea levels to changes in
ice sheets and minimum
sea ice levels, or the passing over of issues like lag time between emissions and effects on temperatures... etc..
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.
Sea ice extent
data, however, has become skewed due to the strong downward
trend in
ice extent, with a wider spread of values and more values falling at the low end of the range.
The area of Arctic
sea ice was nearly 30 % greater in August than a year ago, according to recent satellite
data, though projections based on longer - term
trends suggest the
sea ice will continue its decline over time.
If the
sea ice around Antarctica is growing (on a decadal
trend basis)-- which any schoolboy analysis of freely available basic
data shows...... what does this tell you about the certainty of global warming?
Note that we computed
sea ice — temperature regression coefficients with detrended
data and then multiplied these by the
trend of the
sea ice area to obtain the congruent temperature change.
The downward
trend is quite clear, according to Julienne Stroeve, a
sea ice expert at the National Snow and Ice Data Center, who is currently based at University College Lond
ice expert at the National Snow and
Ice Data Center, who is currently based at University College Lond
Ice Data Center, who is currently based at University College London.
«Global
Sea ice trend by year only (barely) crosses 95 % significance when the first two months of satellite
data is included for the entire record.»
Here, the
sea ice data are used to illuminate how the
trends in
sea ice concentration relate spatially and temporally to the
trends in land temperatures.
We showed that it is the combination of the second and third PCs of Z850
data in the high - latitude SH that best capture the
trend in Z850 and best explain the
trends in
sea ice and temperature.
If you strip the scientific context of a globally rising temperature
trend, you could argue that observed melting of
sea ice is just some noise in the
data, part of natural variation.
If we look at the
data of seasonal variation of
sea ice year by year at Arctic [North Pole] and Antarctic [South Pole] the year to year variations of seasonal
trends are above the average at Antarctica and below the average at Arctic in the last decade.
I believe that there is a downward
trend in Arctic
sea ice because the
data since 1979 points towards one.
Figure 1: Coverage of
sea ice in both the Arctic (Top) and Antarctica (Bottom) for both summer minimums and winter maximums Source: National Snow and Ice Data Center One must also be careful how you interpret trends in Antarctic sea i
ice in both the Arctic (Top) and Antarctica (Bottom) for both summer minimums and winter maximums Source: National Snow and
Ice Data Center One must also be careful how you interpret trends in Antarctic sea i
Ice Data Center One must also be careful how you interpret
trends in Antarctic
sea iceice.
Tamino compares and analyses the long term
trends in
sea ice data from the Northern and Southern Hemisphere in Sea Ice, North and South, Then and N
sea ice data from the Northern and Southern Hemisphere in Sea Ice, North and South, Then and N
ice data from the Northern and Southern Hemisphere in
Sea Ice, North and South, Then and N
Sea Ice, North and South, Then and N
Ice, North and South, Then and Now.