The cruise control is quiet and consistent even with many changes in altitude. (autolist.com)
To assure the model was realistic, the scientists drew on observations of changes in the altitude of the ice sheet surface made by NASA's IceSat satellite and airborne Operation IceBridge campaign. (climatedepot.com)
«Significant changes in altitudes above sea level in several parts of the Arctic, including Svalbard and Greenland, with build - up of ice on land, stimulated the distribution of the sea ice,» Jochen Knies says. (sciencedaily.com)