Filters: Tags: sea ice concentration (X)4 results (169ms)
This data set represents the results of calculations carriedout on sea-ice-concentration data from the SMMR and SSM/Iinstruments. The original data were obtained from theNational Snow and Ice Data Center (NSIDC). The data set alsocontains the source code of the programs that made thecalculations. The objective was to derive monthly averagesfor the whole 13.25-year series (1978-1991) and to derive acomposite series of monthly averages representing thevariation of an average year. The resulting file set containsmonthly images for each of the polar regions for each year,yielding 160 files for each pole, and composite monthlyaverages in which the years are combined, yielding 12 morefiles. Averaging the images in this...
This report summarizes data acquired from 1990 to 1994 forthe gas-hydrate portion of the USGS project "Permafrostand gas hydrate as possible sources of methane" of theUSGS Global Change and Climate History program. Theobjective of this project has been to test the hypothesisthat gas hydrate deposits of the Beaufort Sea continentalshelf are destabilized by the ~10�C temperature increasethat has resulted from the Holocene transgression of theArctic Ocean. To test this idea we have selected an areaoff the north coast of Alaska centered on Harrison Bay. Wehave measured the concentration of methane in surficialsediments, in the water column when ice is present andabsent, and in seasonal sea ice. Our results show thatmore...
Projected open water seasons using four global climate models for 2011 to 2100 fronting Arey Lagoon and Barter Island, Alaska
Estimated start date, end date, and duration of open water at a location fronting Barter Island, Alaska derived from projected sea ice extents in 4 global climate models: MIROC5, BCC-CSM1.1, INM-CM4, and GFDL-ESM2M. Starting and ending dates are when sea ice retreated or is projected to retreat offshore by more than 80 kilometers fronting Barter Island. Projected coastal storm events were derived by downscaling atmospheric conditions of the RCP 4.5 climate scenario with the MIROC5 global climate model (GCM). Sea ice retreat distances were estimated from 4 separate GCMs: MIROC5, BCC-CSM1.1, INM-CM4, GFDL-CM3.
The PRISM 8�x10� data set represents several years ofinvestigation by PRISM (Pliocene Research, Interpretation, andSynoptic Mapping) Project members. One of the goals of PRISMis to produce time-slice reconstructions of intervals ofwarmer than modern climate within the Pliocene Epoch. Thefirst of these was chosen to be at 3.0 Ma (time scale ofBerggren et al., 1985) and is published in Global andPlanetary Change (Dowsett et al., 1994). This documentcontains the actual data sets and a brief explanation of howthey were constructed. For paleoenvironmental interpretationsand discussion of each data set, see Dowsett et al., inpress. The data sets includes sea level, land icedistribution, vegetation or land cover, sea surfacetemperature...