نتایج جستجو برای: satellite altimetry
تعداد نتایج: 81044 فیلتر نتایج به سال:
The poorly known correction for the ongoing deformation of the solid Earth caused by glacial isostatic adjustment (GIA) is a major uncertainty in determining the mass balance of the Antarctic ice sheet from measurements of satellite gravimetry and to a lesser extent satellite altimetry. In the past decade, much progress has been made in consistently modeling ice sheet and solid Earth interactio...
The frequent presence of clouds in optical remotely sensed imagery prevents space and time continuity and limits its exploitation. The aim of this study is to propose a new statistical processing approach for the reconstruction of areas covered by clouds in a time sequence of optical satellite images. The approach is an iterative SOM based algorithm and is applied here to reconstruct ocean colo...
We analyze satellite altimeter observed Caspian Sea level (CSL) changes over the period January 1993 to December 2021 using lake series from Hydroweb project and global sea anomalies (SLA) grids provided by Copernicus Marine Environment Monitoring Service (CMEMS). The two altimeter-based CSL agree well at interannual longer time scales, but show significantly large discrepancies seasonal shorte...
Abstract. The ocean's sea surface height (SSH) field is a complex mix of motions in geostrophic balance and unbalanced including high-frequency tides, internal gravity waves. Barotropic tides are well estimated for altimetric SSH the open ocean, but signals remain. transition scale, Lt, at which these ageostrophic dominate balanced first time using satellite altimetry. Lt critical to define spa...
Alaskan glaciers are among the largest regional contributors to sea-level rise in the latter half of the 20th century. Earlier studies have documented extensive and accelerated ice wastage in most regions of Alaska. Here we study five decades of mass loss on high-elevation, land-terminating glaciers of the Wrangell Mountains ( 4900 km) in central Alaska based on airborne center-line laser altim...
In this paper, a method is proposed for producing gravity acceleration at sea surface in the Persian Gulf. This method is based on the Geoid height from satellite altimetry, high resolution Geopotential models, and ellipsoidal splines. First, the definition of the ellipsoidal spline functions is presented in a Hilbert space, which is consisted of infinitely often differentiable functions. In or...
Oceanic tidal angular momentum (OTAM) is calculated for the four major tides of the Arctic Ocean, based on the tidal elevations and current velocities from a recent two-dimensional numerical hydrodynamic model. The presented OTAM tables are meant to be complementary to other modeling studies that use satellite altimetry (which cannot observe Arctic Ocean tides because of ice cover and limited s...
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