Sentences with phrase «estimate sea ice conditions»

The Sea Ice Index relies on NASA - developed methods to estimate sea ice conditions using passive - microwave data from the Defense Meteorological Satellite Program (DMSP) the Special Sensor Microwave Imager / Sounder (SSMIS).

Not exact matches

I've noted his work before, but it never hurts to repeat that Andy Lee Robinson has been creating effective animated graphs of estimated sea ice volume (as distinct from area or extent) that provide a long view of shifting conditions.

In our 2010 SIO estimate, it was found that the CFSv2 sea ice extent seemed too excessive (due to too thick ice in the initial condition), and the extent confined within 60 cm of ice thickness matches the real time observation.

The initial conditions were modified from real time CFSv2 initial conditions by thinning the ice pack, similar to what we did in making our 2011 and 2012 sea ice outlook (SIO) estimate.

Arbetter, 4.7, Statistical A statistical model using regional observations of sea ice area and global NCEP air temperature, sea level pressure, and freezing degree day estimates continues the trend of projecting below - average summer sea ice conditions for the Arctic.

We interpret the split of 2013 Outlooks above and below the 4.1 level to different interpretations of the guiding physics: those who considered that observed sea ice extent in 2012 being well below the 4.1 level indicates a shift in arctic conditions, especially with regard to reduced sea ice thickness and increased sea ice mobility; and those who have estimates above 4.1 who support a return to the longer - term downward trend line (1979 - 2007).

We interpret the split of 2013 Outlooks above and below the 4.1 median to different interpretations of the guiding physics: those who considered that observed sea ice extent in 2012 being well below the 4.1 level indicates a shift in arctic conditions, especially with regard to reduced sea ice thickness and increased sea ice mobility; and those with estimates above 4.1 who support a return to the longer - term downward trend line (1979 - 2007).

Sea - ice age estimates in spring, showing conditions during the last week of April in 2009 (upper image) and 2010 (lower image).

Rigor et al. (Polar Science Center, University of Washington); 5.4 Million Square Kilometers; Heuristic This estimate is based on the prior winter Arctic Oscillation (AO) conditions, and the spatial distribution of the sea ice of different ages as estimated from a Drift - age Model (DM), which combines buoy drift and retrievals of sea ice drift from satellites (Rigor and Wallace, 2004, updated).

This is substantially lower than the earlier estimates, reflecting both lower than average sea ice extent used as initial conditions this summer and a persistent downward trend in sea ice extent over the past decade (and longer).

• How can improved estimates of sea ice thickness help improve seasonal predictions of sea ice conditions?

The coupling of IP25 with phytoplankton biomarkers such as brassicasterol or dinosterol proves to be a viable approach to determine (spring / summer) sea ice conditions as is demonstrated by the good alignment of the PIP25 - based estimate of the recent sea ice coverage with satellite observations38.

The second method uses a optimal filtering based statistical model, and the third estimate is based on regression models relating September sea ice extent to spring atmospheric and oceanic conditions.

However, scientists have used historical records of sea ice conditions to estimate sea ice extent before 1979.

While several August Outlooks did not change from the July Outlook, forecasts using statistical techniques together with end of July sea ice conditions tended to show slightly lower estimates for the September minimum compared to the previous outlook (e.g. Meier et al.; Beitsch et al.; Lukovich et al.; Randles).