首页> 外文会议>Proceedings of CryoSat validation workshop 2011. >SENSITIVITY OF ELEVATIONS OBSERVED BY SATELLITE RADAR ALTIMETER OVER ICE SHEETS TO VARIATIONS IN BACKSCATTER POWER AND DERIVED CORRECTIONS
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SENSITIVITY OF ELEVATIONS OBSERVED BY SATELLITE RADAR ALTIMETER OVER ICE SHEETS TO VARIATIONS IN BACKSCATTER POWER AND DERIVED CORRECTIONS

机译:卫星雷达高度计在冰面上观测到的高程对后向散射功率变化和推导改正的敏感性

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Radar-altimeter-measured surface elevations over icernsheets are sensitive to changes in the surfacernbackscatter power that vary temporally andrngeographically. A correction is needed to extract thernreal elevation change (dH/dt) from the altimetrymeasuredrnranges using either the backscatterrncoefficient (σ0) or the Automatic Gain control (AGC)rnas a measure of the backscatter power. We derivernsensitivities between observed changes in elevationrnand changes in the backscatter power using threernmethods, which give different sensitivities (short-term,rnmixed-term, and long-term) and different correlationrncoefficients. The short-term sensitivities tend to bernlarger than the mixed term sensitivities and give largerrncorrections. The resulting corrected H(t) series showrnsignificant differences from the uncorrected H(t). Inrnparticular, the apparent seasonal cycle in the correctedrnH(t) is much smoother and smaller in amplitude. Also,rnin many locations the derived dH/dt from therncorrected H(t) is quite different than from thernuncorrected H(t).
机译:雷达高度计测得的冰盖表面高程对随时间和地理变化的地表背向散射功率变化敏感。需要进行校正,以使用后向散射系数(σ0)或自动增益控制(AGC)从后向散射功率的测量值中,从测高测距范围中提取实际高程变化(dH / dt)。我们使用三种方法推导了观测到的仰角变化与后向散射功率变化之间的灵敏度,这三种方法给出了不同的灵敏度(短期,混合和长期)和不同的相关系数。短期敏感度往往比混合项敏感度大,并给出较大的校正。所得的校正后的H(t)系列与未校正后的H(t)表现出显着差异。特别是,校正后的rnH(t)中的表观季节周期要平滑得多,振幅也要小得多。同样,在许多位置,从校正后的H(t)导出的dH / dt与从校正后的H(t)导出的dH / dt完全不同。

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