气候变化领域集成服务门户(CCPortal): Niger discharge from radar altimetry: Bridging gaps between gauge and altimetry time series

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DOI	10.5194/hess-23-4113-2019
	Niger discharge from radar altimetry: Bridging gaps between gauge and altimetry time series
	Schröder S.; Springer A.; Kusche J.; Uebbing B.; Fenoglio-Marc L.; Diekkrüger B.; Pomeón T.
发表日期	2019
ISSN	1027-5606
起始页码	4113
结束页码	4128
卷号	23 期号:10
英文摘要	The Niger River represents a challenging target for deriving discharge from spaceborne radar altimeter measurements, particularly since most terrestrial gauges ceased to provide data during the 2000s. Here, we propose deriving altimetric rating curves by "bridging" gaps between time series from gauge and altimeter measurements using hydrological model simulations. We show that classical pulse-limited altimetry (Jason-1 and Jason-2, Envisat, and SARAL/Altika) subsequently reproduces discharge well and enables continuing the gauge time series, albeit at a lower temporal resolution. Also, synthetic aperture radar (SAR) altimetry picks up the signal measured by earlier altimeters quite well and allows the building of extended time series of higher quality. However, radar retracking is necessary for pulse-limited altimetry and needs to be further investigated for SAR. Moreover, forcing data for calibrating and running the hydrological models must be chosen carefully. Furthermore, stage-discharge relations must be fitted empirically and may need to allow for break points. © 2019 Author(s).
语种	英语
scopus关键词	Discharge (fluid mechanics); Gages; Hydrology; Meteorological instruments; Radar measurement; Space applications; Synthetic aperture radar; Time series; Altimeter measurements; Break-points; Hydrological modeling; Hydrological models; Radar altimetry; Rating curve; Stage-discharge relations; Temporal resolution; Geodetic satellites; calibration; Envisat; gauge; hydrological modeling; Jason; radar altimetry; river discharge; SARAL; signal; simulation; spectral resolution; time series analysis; Niger River
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159593
作者单位	Schröder, S., Institute of Geodesy and Geoinformation, University of Bonn, Bonn, 53115, Germany; Springer, A., Institute of Geodesy and Geoinformation, University of Bonn, Bonn, 53115, Germany; Kusche, J., Institute of Geodesy and Geoinformation, University of Bonn, Bonn, 53115, Germany; Uebbing, B., Institute of Geodesy and Geoinformation, University of Bonn, Bonn, 53115, Germany; Fenoglio-Marc, L., Institute of Geodesy and Geoinformation, University of Bonn, Bonn, 53115, Germany; Diekkrüger, B., Department of Geography, University of Bonn, Bonn, 53115, Germany; Pomeón, T., Department of Geography, University of Bonn, Bonn, 53115, Germany, Agrosphere Institute (IBG-3), Forschungszentrum Jülich, Jülich, 52425, Germany
推荐引用方式 GB/T 7714	Schröder S.,Springer A.,Kusche J.,et al. Niger discharge from radar altimetry: Bridging gaps between gauge and altimetry time series[J],2019,23(10).
APA	Schröder S..,Springer A..,Kusche J..,Uebbing B..,Fenoglio-Marc L..,...&Pomeón T..(2019).Niger discharge from radar altimetry: Bridging gaps between gauge and altimetry time series.Hydrology and Earth System Sciences,23(10).
MLA	Schröder S.,et al."Niger discharge from radar altimetry: Bridging gaps between gauge and altimetry time series".Hydrology and Earth System Sciences 23.10(2019).