应用卫星重力数据监测维多利亚湖流域水储量变化
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摘要
维多利亚湖是非洲第一大淡水湖,也是全球十大湖泊中纬度最低的淡水湖,有利于GRACE的监测。维多利亚湖为其流域内的居民提供了赖以生存的淡水资源,监测其水储量变化有重要意义。利用2003年1月至2016年12月间的GRACE时变重力场数据反演其水储量变化,针对GRACE数据处理过程中产生的信号泄漏问题,采用Forward Modeling的方法恢复信号,结果表明:此方法能有效地减小泄漏误差,恢复初始信号;通过分析维多利亚湖流域水储量的变化趋势,发现其水储量在2003年至2016年有明显的阶段性变化,并且水储量易受到自然因素和人为因素影响;联合GRACE、卫星测高和GLDAS计算了流域内的地下水变化,其趋势与WGHM模式输出结果具有很好的一致性。
Lake Victoria,the largest freshwater body in Africa,it's the world's largest lake with the lowest latitude,its geography location is conducive to GRACE's monitoring,it provides the living water resources for the surrounding residents,so it's significant to monitor the terrestrial water storage change in the basin. In this paper the time series variation of the water storage in Lake Victoria Basin has been calculated using the time-variable gravity data from GRACE( Gravity Recovery and Climate Experiment) between January 2003 and December 2016. Biases that are caused by spatial leakage errors can be effectively reduced by applying the unconstrained forward modeling to GRACE monthly TWS estimates. Analyzing the long-term variation of the TWS indicates that the TWS variation in the basin has obviously changes in the period. And the TWS are easy to be influenced by human factors and natural factors. In addition,the groundwater storage changes have been estimated using GRACE-derived TWS change,Satellite Altimetry and Global Land Data Assimilation System( GLDAS) data,the results have good relativity with the Water GAP Global Hydrology Model( WGHM) output.
Lake Victoria,the largest freshwater body in Africa,it's the world's largest lake with the lowest latitude,its geography location is conducive to GRACE's monitoring,it provides the living water resources for the surrounding residents,so it's significant to monitor the terrestrial water storage change in the basin. In this paper the time series variation of the water storage in Lake Victoria Basin has been calculated using the time-variable gravity data from GRACE( Gravity Recovery and Climate Experiment) between January 2003 and December 2016. Biases that are caused by spatial leakage errors can be effectively reduced by applying the unconstrained forward modeling to GRACE monthly TWS estimates. Analyzing the long-term variation of the TWS indicates that the TWS variation in the basin has obviously changes in the period. And the TWS are easy to be influenced by human factors and natural factors. In addition,the groundwater storage changes have been estimated using GRACE-derived TWS change,Satellite Altimetry and Global Land Data Assimilation System( GLDAS) data,the results have good relativity with the Water GAP Global Hydrology Model( WGHM) output.
引文
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[4] Chen J L,Wilson C R,Tapley B D,et al. 2005 drought event in the Amazon River basin as measured by GRACE and estimated by climate models[J]. Journal of Geophysical Research,2009,114(B5):15-17.
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[11]尼胜楠,陈剑利,李进,等.利用GRACE卫星时变重力场监测长江、黄河流域水储量变化[J].大地测量与地球动力学,2014,34(4):49-55.
[12]罗志才,李琼,钟波.利用GRACE时变重力场反演黑河流域水储量变化[J].测绘学报,2012,41(5):676-681.
[13]李琼,罗志才,钟波,等.利用GRACE时变重力场探测2010年中国西南干旱陆地水储量变化[J].地球物理学报,2013,56(6):1 843-1849.
[14]吴云龙,李辉,邹正波,等.基于Forward-Modeling方法的黑河流域水储量变化特征研究[J].地球物理学报,2015,58(10):3 507-3 516.
[15] Swenson S,Chambers D,Wahr J. Estimating geocenter variations from a combination of GRACE and ocean model output[J]. Journal of Geophysical Research:Solid Earth,2008,113(B8):410-422.
[16] Chen J L,Wilson C R,Li J,et al. Reducing leakage error in GRACE-observed long-term ice mass change:a case study in West Antarctica[J]. Journal of Geodesy,2015,89(9):925-940.
[17] Crétaux J F,Jelinski W,Calmant S,et al. SOLS:A lake database to monitor in the Near Real Time water level and storage variations from remote sensing data[J]. Advances in Space Research,2011,47(9):1 497-1 507.
[18] Swenson S,Wahr J. Monitoring the water balance of Lake Victoria,East Africa,from space[J]. Journal of Hydrology,2009,370(1-4):163-176.
[2] Swenson S,Wahr J. Methods for inferring regional surface-mass anomalies from Gravity Recovery and Climate Experiment(GRACE)measurements of time-variable gravity[J]. Journal of Geophysical Research:Solid Earth,2002,107(B9):1-3.
[3] Tapley B D. GRACE Measurements of Mass Variability in the Earth System[J]. Science,2004,305(5 683):503-505.
[4] Chen J L,Wilson C R,Tapley B D,et al. 2005 drought event in the Amazon River basin as measured by GRACE and estimated by climate models[J]. Journal of Geophysical Research,2009,114(B5):15-17.
[5]冯伟,Jean-Michel Lemoine,钟敏,等.利用重力卫星GRACE监测亚马逊流域2002—2010年的陆地水变化[J].地球物理学报,2012,55(3):814-821.
[6] Swenson S,Wahr J. Multi-sensor analysis of water storage variations of the Caspian Sea[J]. Geophysical Research Letters,2007,34(16):105-106.
[7] Rodell M,Velicogna I,Famiglietti J S. Satellite-based estimates of groundwater depletion in India[J]. Nature,2009,460(7 258):999-1 002.
[8] Chen J,Li J,Zhang Z,et al. Long-term groundwater variations in Northwest India from satellite gravity measurements[J]. Global and Planetary Change, 2014(116):130-138.
[9] Feng W,Zhong M,Lemoine J,et al. Evaluation of groundwater depletion in North China using the Gravity Recovery and Climate Experiment(GRACE)data and ground-based measurements[J]. Water Resources Research,2013,49(4):2 110-2 118.
[10]胡小工,陈剑利,周永宏,等.利用GRACE空间重力测量监测长江流域水储量的季节性变化[J].中国科学(D辑:地球科学),2006,36(3):225-232.
[11]尼胜楠,陈剑利,李进,等.利用GRACE卫星时变重力场监测长江、黄河流域水储量变化[J].大地测量与地球动力学,2014,34(4):49-55.
[12]罗志才,李琼,钟波.利用GRACE时变重力场反演黑河流域水储量变化[J].测绘学报,2012,41(5):676-681.
[13]李琼,罗志才,钟波,等.利用GRACE时变重力场探测2010年中国西南干旱陆地水储量变化[J].地球物理学报,2013,56(6):1 843-1849.
[14]吴云龙,李辉,邹正波,等.基于Forward-Modeling方法的黑河流域水储量变化特征研究[J].地球物理学报,2015,58(10):3 507-3 516.
[15] Swenson S,Chambers D,Wahr J. Estimating geocenter variations from a combination of GRACE and ocean model output[J]. Journal of Geophysical Research:Solid Earth,2008,113(B8):410-422.
[16] Chen J L,Wilson C R,Li J,et al. Reducing leakage error in GRACE-observed long-term ice mass change:a case study in West Antarctica[J]. Journal of Geodesy,2015,89(9):925-940.
[17] Crétaux J F,Jelinski W,Calmant S,et al. SOLS:A lake database to monitor in the Near Real Time water level and storage variations from remote sensing data[J]. Advances in Space Research,2011,47(9):1 497-1 507.
[18] Swenson S,Wahr J. Monitoring the water balance of Lake Victoria,East Africa,from space[J]. Journal of Hydrology,2009,370(1-4):163-176.