Potential of SARAL/AltiKa for Inland Water Applications
Potential of SARAL/AltiKa for Inland Water Applications
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DOI：
10.1080/01490419.2015.1008710
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发表时间：
2015-02
期刊：
影响因子：
1.6
通讯作者：
C. Schwatke;D. Dettmering;Eva Börgens;W. Bosch
中科院分区：
文献类型：
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作者：
C. Schwatke;D. Dettmering;Eva Börgens;W. Bosch
SARAL使用与ERS和Envisat相同的轨道，可用于延长从这些任务中获得的内陆水高度时间序列。本文研究了SARAL在五大湖和亚马逊流域的应用潜力。SARAL/AltiKa是第一个使用ka波段的高度计，很少受到电离层效应的影响，但容易受到大气水的影响。我们的调查显示，由于降水，SARAL的波形明显中断。结果表明，采用ice-1等可替代的回拉器产品后，水高质量得到了改善。这种改善取决于天气，在潮湿条件下产量可达3.8厘米。SARAL占地面积较小的优势在陆地-水过渡中得到了证明，其中SARAL提供了距离湖岸6公里的更好的水位高度，而Envisat仅限于约11公里。SARAL还为狭窄的亚马逊河流提供了比Envisat更可靠的水位高度。此外，SARAL的钩效应降低。将SARAL-only、Envisat-only和多任务的水位时间序列与原位数据进行比较表明，SARAL有可能延长Envisat的长期时间序列，并将大型湖泊的RMS降低约10%，将选定河流的RMS降低40%。
SARAL uses the same orbit as ERS and Envisat and can be used to extend inland water height time series derived from these missions. This article investigates the potential of SARAL for this application over the Great Lakes and the Amazon basin. SARAL/AltiKa is the first altimeter using Ka-band that is rarely influenced by ionospheric effects but susceptible for atmospheric water. Our investigations show clear waveform disruptions for SARAL due to precipitation. It is demonstrated that the quality of water heights improved when using alternative retracker products, for example, the ice-1 product. The improvement depends on the weather and yields up to 3.8 cm for wet conditions. The advantage of the smaller footprint of SARAL is demonstrated for land-water transitions where SARAL provides better water level heights up to 6 km to the lakeshore whereas Envisat is limited to about 11 km. SARAL provides also more reliable water level heights for narrow Amazon rivers than Envisat. Furthermore, the hooking effect is decreased for SARAL. Comparing water level time series of SARAL-only, Envisat-only, and multi-mission with in-situ data demonstrates that SARAL has the potential to extend Envisat long-term time series and to decrease the RMS by about 10% for large lakes and 40% for selected rivers.