Lake Level Variations Monitored With Satellite Altimetry Waveform Retracking

Guo, Jinyun; Chang, Xiaotao; Gao, Yonggang; Sun, Jinquan; Hwang, Cheinway

doi:10.1109/jstars.2009.2021673

Cited by 32 publications

(15 citation statements)

References 13 publications

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“…We utilized ICE-1 retracking algorithm provided by AVISO with a time span covering regular operation mode, 2002-2012 (cycle 6-93). ICE-1/ICE-2 algorithms developed for analyzing specular shape of waveform over ice sheet are applicable for lake observations with similar waveform patterns [35][36][37][38]. As shown in Figure 1, Envisat had two passes, #83 and #305, with crossovers in study site.…”

Section: Radar and Laser Altimetrymentioning

confidence: 99%

Quantifying Freshwater Mass Balance in the Central Tibetan Plateau by Integrating Satellite Remote Sensing, Altimetry, and Gravimetry

et al. 2016

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Abstract:The Tibetan Plateau (TP) has been observed by satellite optical remote sensing, altimetry, and gravimetry for a variety of geophysical parameters, including water storage change. However, each of these sensors has its respective limitation in the parameters observed, accuracy and spatial-temporal resolution. Here, we utilized an integrated approach to combine remote sensing imagery, digital elevation model, and satellite radar and laser altimetry data, to quantify freshwater storage change in a twin lake system named Chibuzhang Co and Dorsoidong Co in the central TP, and compared that with independent observations including mass changes from the Gravity Recovery and Climate Experiment (GRACE) data. Our results show that this twin lake, located within the Tanggula glacier system, remained almost steady during 1973-2000. However, Dorsoidong Co has experienced a significant lake level rise since 2000, especially during [2000][2001][2002][2003][2004][2005], that resulted in the plausible connection between the two lakes. The contemporary increasing lake level signal at a rate of 0.89˘0.05 cm¨yr´1, in a 2˝by 2˝grid equivalent water height since 2002, is higher than the GRACE observed trend at 0.41˘0.17 cm¨yr´1 during the same time span. Finally, a down-turning trend or inter-annual variability shown in the GRACE signal is observed after 2012, while the lake level is still rising at a consistent rate.

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Section: Radar and Laser Altimetrymentioning

confidence: 99%

Quantifying Freshwater Mass Balance in the Central Tibetan Plateau by Integrating Satellite Remote Sensing, Altimetry, and Gravimetry

et al. 2016

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“…With more than 30 years development, great achievements have been made in the ocean altimetry technique (Rapley 1990;Chelton et al 2001). Satellite radar altimetry applications are not only for open oceans where deep researches have been performed, but also for coastal seas with much more complex conditions (Freeman and Berry 2006;Hwang et al 2006;Guo et al 2010) as well as monitoring water level variations in inland lakes (Campos et al 2001;Hwang et al 2005;Guo et al 2009Guo et al , 2011Lee et al 2011). Over coastal seas the waveform retracking technique is used to improve altimetric data to study geodesy, geophysics and oceanography (Guo et al , 2010Hwang et al 2006;Chang et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Decadal Variation in Surface Characteristics over Xinjiang, Western China, from T/P Altimetry Backscatter Coefficients: Evidence of Climate Change

Guo¹,

Yang²,

Liu³

et al. 2013

Terr. Atmos. Ocean. Sci.

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The backscatter coefficient, known as sigma0, is an important measurement of satellite radar altimetry and a key parameter for land altimetry because of its close relationship with the physical properties and geometric features of land coverage under global/regional climate change effects. Using the TOPEX/Poseidon GDR-M dataset from January 1993 to December 2004, we study the spatial and temporal distribution of sigma0 at bands Ku and C over Xinjiang, western China. The results show that the sigma0 is influenced by the water distribution over land and the time evolution of sigma0 has clear seasonal changes. River basins or deserts are classified over the spatial distribution based on different sigma0 values. For example, high sigma0 values are found in the Tarim River Basin and low values are found in the Taklimakan Desert. The periodic components of sigma0 time series are determined using the fast Fourier transformation method. The annual variation is the dominating cycle and the semi-annual variation is the secondary signal. The amplitudes of sigma0 time series at bands Ku and C are also given and most areas have quite low amplitudes except for the Tarim River Basin. Several areas including the Tarim River Basin, Tianshan Mountain and Taklimakan Desert are selected for sigma0 time series spacial analysis to discuss the reasons for variations in sigma0. The main factors are precipitation and vegetation growth, which are affected by the global/ regional climate change. The correlation between the brightness temperature, which is related to the water-vapor content in the atmosphere measured by TMR at the 21 GHz channel and sigma0 at two bands, is analyzed.

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“…Satellite radar altimetry provides this facility and has been used for many years to measure large lakes [1], [2]. More recently, the use of this technique has been extended to many locations on major river and lake systems [3]- [6].…”

Section: Introductionmentioning

confidence: 99%

“…More recently, the use of this technique has been extended to many locations on major river and lake systems [3]- [6]. The capability of this method continues to grow as techniques to analyze the altimeter data, particularly the ability to retrack the waveforms, become more sophisticated [2], [6]. The next generation of satellite radar altimeters offers the possibility further to enhance the retrieval capability due to their higher pulse repetition frequency (PRF).…”

Section: Introductionmentioning

confidence: 99%

Global Analysis of EnviSat Burst Echoes Over Inland Water

Berry

Smith

Salloway

et al. 2012

IEEE Trans. Geosci. Remote Sensing

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Satellite radar altimeters have an established and increasingly vital role in monitoring the Earth's surface inland water resources. This paper analyzes two years of EnviSat burst echoes (which have 3.9-m nominal along-track separation) over rivers, lakes, and ephemeral water globally to assess the increase in monitoring potential afforded by the higher pulse repetition frequency (PRF) of the next generation of synthetic aperture radar altimeters and investigate spatial burst correlation. Burst echoes at 1800 Hz are successfully retracked with no waveform averaging. The conclusion is that the higher PRF allows detection and measurement of water bodies on a far finer spatial scale because water is a very bright reflector at Ku-band and land in general is relatively poor, with pools of water a few tens of meters across being successfully identified.

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Lake Level Variations Monitored With Satellite Altimetry Waveform Retracking

Cited by 32 publications

References 13 publications

Quantifying Freshwater Mass Balance in the Central Tibetan Plateau by Integrating Satellite Remote Sensing, Altimetry, and Gravimetry

Quantifying Freshwater Mass Balance in the Central Tibetan Plateau by Integrating Satellite Remote Sensing, Altimetry, and Gravimetry

Decadal Variation in Surface Characteristics over Xinjiang, Western China, from T/P Altimetry Backscatter Coefficients: Evidence of Climate Change

Global Analysis of EnviSat Burst Echoes Over Inland Water

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