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arXiv 1603.08698physics.ao-ph
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波罗的海地区多任务高度计波高数据的确认

Validation of the multi-mission altimeter wave height data for the Baltic Sea region

N. A. Kudryavtseva, T. Soomere

摘要:

我们提出了一个完整的交叉验证的显着波高(SWH)提取的测高数据从所有现有的10个卫星与现场(浮标和回声测深仪)波测量的波罗的海盆地。其主要目的是选择一个适当的测高数据子集的波候的后续评估。后向散射系数> 13.5 cdb、SWH归一化标准差误差> 0.5 m和质心距地小于0.2 °的快照是不可靠的。冰旗通常表示冰浓度> 50%。冰的存在从浓度10%开始影响SWH数据,但实质性影响仅在浓度> 30%时明显。根据这些标准选择的测高数据与现场数据有很好的对应关系,但GEOSAT第一阶段数据(1985-1989年)无法验证。测高数据和现场数据的均方根差在0.23-0.37范围内,与~1 m的平均波高相比,这对于波罗的海来说很重要。CRYOSAT-2、ERS-2、JASON-1/2和SARAL数据的偏差低于0.06米。ENVISAT、ERS-1、GEOSAT和TOPEX卫星显示的偏差较大,最高可达0.23米。几对卫星(ENVISAT/JASON-1、SARAL/JASON-2、ERS-1/TOPEX)的SWH时间序列表现出很大的相互时间漂移,其中一部分在时间上明显不均匀。来自SARAL卫星的一组新的高分辨率SWH数据显示,与现场数据和来自以前卫星的数据流有很好的对应关系。

英文摘要:

We present a complete cross-validation of significant wave heights (SWH) extracted from altimetry data from all ten existing satellites with available in situ (buoy and echosounder) wave measurements for the Baltic Sea basin. The main purpose is to select an adequate altimetry data subset for a subsequent evaluation of the wave climate. The satellite measurements with the backscatter coefficients > 13.5 cdb, errors in the SWH normalized standard deviation > 0.5 m and snapshots with centroids closer than 0.2 degrees to the land are not reliable. The ice flag usually denotes the ice concentration of > 50%. The presence of ice affects the SWH data starting from concentrations 10%, but substantial effects are only evident for concentrations > 30%. The altimetry data selected based on these criteria have very good correspondence with in situ data, except for GEOSAT Phase 1 data (1985-1989) that could not be validated. The root-mean-square difference of altimetry and in situ data is in the range of 0.23-0.37, which is significant for the Baltic Sea, compared with an average wave height of ~1 m. The bias for CRYOSAT-2, ERS-2, JASON-1/2 and SARAL data is below 0.06 m. The ENVISAT, ERS-1, GEOSAT and TOPEX satellites revealed larger biases up to 0.23 m. The SWH time series from several satellite pairs (ENVISAT/JASON-1, SARAL/JASON-2, ERS-1/TOPEX) exhibit substantial mutual temporal drift and part of them evidently are not homogeneous in time. A new high-resolution SWH data set from the SARAL satellite reveals a very good correspondence with the in situ data and with the data stream from previous satellites.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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