نتایج جستجو برای: altimeter
تعداد نتایج: 1652 فیلتر نتایج به سال:
[1] A decade-long satellite altimeter data set is used to analyze the annual variations in the sea surface height (SSH) field northeast of the Hawaiian Islands. The annual harmonic amplitudes for the SSH and the along-island geostrophic flow are 2–4 cm and 2–4 cm s , respectively. Although these values are an order of magnitude smaller than the regional mesoscale eddy signals, the annual SSH si...
Comparison of ice discharge from higher elevation areas of the entire Greenland Ice Sheet with total snow accumulation gives estimates of ice thickening rates over the past few decades. On average, the region has been in balance, but with thickening of 21 centimeters per year in the southwest and thinning of 30 centimeters per year in the southeast. The north of the ice sheet shows less variabi...
A 3200-kilometers-long profile of Mercury by the Mercury Laser Altimeter on the MESSENGER spacecraft spans approximately 20% of the near-equatorial region of the planet. Topography along the profile is characterized by a 5.2-kilometer dynamic range and 930-meter root-mean-square roughness. At long wavelengths, topography slopes eastward by 0.02 degrees , implying a variation of equatorial shape...
[1] The world’s oceans can potentially be used as an extended target for achieving a radiometric calibration of space borne lidar if the reflective properties of the surface can be accurately predicted from available environmental data such as wind speed. To test current understanding of ocean reflectance we compare surface pulse returns measured with the 1064 nm altimetry channel of the Geosci...
Abstract For nearly three decades, satellite nadir altimeters have provided essential information to understand primarily ocean but also inland water dynamics. A variety of parameters can be inferred via altimeter measurements, including sea surface height, wind speeds, significant wave heights, and topography land, ice, ice sheets. Taking advantage these with the long record data spanning mult...
Recent aircraft and satellite laser altimeter surveys of the Amundsen Sea sector of West Antarctica show that local glaciers are discharging about 250 cubic kilometers of ice per year to the ocean, almost 60% more than is accumulated within their catchment basins. This discharge is sufficient to raise sea level by more than 0.2 millimeters per year. Glacier thinning rates near the coast during ...
During the Commissioning Phase of ERS–2 a relative calibration exercise was performed in which ERS–1 and ERS–2 altimeter data, obtained with a one-day separation in time, were compared. Many groups noticed a step change in the relative bias of 3–4 cm which occurred on 1 August 1995, and closer examination of the data-set revealed others. An example of the relative bias estimate, revealing a num...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید