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首页> 外文会议>CryoSat third user workshop >ANALYSIS AND INTER-CALIBRATION OF WET PATH DELAY DATASETS TO COMPUTE THE WET TROPOSPHERIC CORRECTION FOR CRYOSAT-2 OVER OCEAN
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ANALYSIS AND INTER-CALIBRATION OF WET PATH DELAY DATASETS TO COMPUTE THE WET TROPOSPHERIC CORRECTION FOR CRYOSAT-2 OVER OCEAN

机译：计算海洋上CRYOSAT-2的湿对流改正的湿路径延迟数据集的分析和标定

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摘要

Unlike most altimetric missions, CryoSat-2 (CS-2),rnoriginally conceived for cryosphere studies, is notrnequipped with an onboard microwave radiometerrn(MWR) to provide the wet tropospheric correctionrn(WTC) to the radar altimeter measurements, thus theirrncorrection currently relies on a model-based onernprovided by the European Centre for Medium-rangernWeather Forecasts (ECMWF). In the ambit of ESArnfunded project CP4O, an improved WTC for CS-2 datarnover ocean is under development, based on a datarncombination algorithm (DComb) through objectivernanalysis of WTC values derived from all existing datarntypes.rnThe scope of this study is the analysis of the variousrnavailable datasets for the computation of the wet pathrndelay of altimeter measurements over ocean, and therninter-calibration of the derived WTC. Emphasis is givenrnto the analysis of the WTC derived from water vapourrnproducts of different scanning MWR aboard variousrnremote sensing (RS) missions. Together with wet pathrndelays derived at Global Navigation Satellite Systemrn(GNSS) coastal and island stations and data from thernECMWF ReAnalysis (ERA) Interim model, these willrnconstitute the main data sets for use in the DCombrnalgorithm.rnA brief summary of the main issues regarding therncomputation of the WTC from all used data products isrnpresented.rnFor open ocean altimetry, an inter-calibration ofrnscanning MWR derived WTC is performed, using thernAdvanced Microwave Radiometer (AMR) on boardrnJason-2 as reference. Moreover, the analysis of thernorbital parameters of CS-2 and all other considered RSrnmissions, as well as the respective scanning MWRrncharacteristics, provides an insight into the expectedrnimpact of these data sets on the final derived WTC.rnThe best approach for calculating the WTC from totalrncolumn water vapour (TCWV) is investigated. Thernselected approach is shown to be well suited forrnaccurate Level-2 scientific products.
机译：与大多数高空任务不同，CryoSat-2（CS-2）原本是为冰冻圈研究而设计的，没有配备机载微波辐射计（MWR）来为雷达高度计测量提供湿对流层校正（WTC），因此，目前它们的校正依赖于基于欧洲中型天气预报中心（ECMWF）提供的模型。在ESA资助的项目CP4O的范围内，正在通过对所有现有数据类型得出的WTC值进行客观分析，基于数据组合算法（DComb），正在开发一种用于CS-2数据海洋的改进的WTC。本研究的范围是对各种高度可用的数据集，用于计算海洋上的高度计测量值的湿路径延迟，以及对得出的WTC进行内部校准。着重分析了来自各种遥感（RS）任务中不同扫描MWR的水蒸气产物的WTC。连同从全球导航卫星系统（GNSS）海岸和岛屿站获得的湿路径延迟以及来自ECMWF重新分析（ERA）临时模型的数据，这些将构成DCombrnalgorithm中使用的主要数据集。对于公开海洋测高仪，使用BoardJason-2上的高级微波辐射计（AMR）作为参考，对扫描MWR得出的WTC进行了相互校准。此外，对CS-2的鼻咽参数以及所有其他考虑的RS发射的分析以及各自的扫描MWR的特征，可以洞悉这些数据集对最终得出的WTC的预期影响。-从总柱计算WTC的最佳方法研究了水蒸气（TCWV）。事实证明，这种选择的方法非常适合于不准确的2级科学产品。

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  • 来源
    《CryoSat third user workshop》|2013年|1-8|共8页
  • 会议地点 Dresden(DE)
  • 作者

    M. Joana Fernandes; Alexandra L. Nunes; Clara Lázaro;

  • 作者单位

    Universidade do Porto, Faculdade de Ciências, Porto, Portugal, Email:mjfernan@fc.up.pt Centro Interdisciplinar de Investiga??o Marinha e Ambiental (CIIMAR), Porto, Portugal;

    Centro Interdisciplinar de Investiga??o Marinha e Ambiental (CIIMAR), Porto, Portugal Instituto Politécnico do Porto, ISEP, Porto, Portugal;

    Universidade do Porto, Faculdade de Ciências, Porto, Portugal, Centro Interdisciplinar de Investiga??o Marinha e Ambiental (CIIMAR), Porto, Portugal;

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