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sea level variations in the south China sea inferred from satellite gravity,altimetry,and oceanographic data

science China earth sciences 2012年第10期55卷 1696-1701页

作者： feng wei 1,2,zhong min 1,3.& xu houze 1,3.1 state key laboratory of geodesy and earth’s dynamics,institute of geodesy and geophysics,chinese academy of sciences,wuhan 4.0077,China 2 Graduate University of chinese academy of sciences,Beijing 100049,China 3 institute of geophysics,Huazhong University of science and Technology,wuhan 4.0074,China 1. state key laboratory of geodesy and earth’s dynamics Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan 430077 China2. Graduate University of Chinese Academy of Sciences Beijing 100049 China3. Institute of Geophysics Huazhong University of Science and Technology Wuhan 430074 China

sea level variations(sLVs) can be divided into two major components:the steric sLV and the mass-induced *** two components of sLV in the south China sea(sCs) are studied by using satellite altimetry,GRACE(Gravity Recovery and Climate Experiment) satellite gravity,and oceanographic data on annual and inter-annual *** the annual timescale,the geographic distribution of mass-induced sLV's amplitude jointly estimated from altimetry and the ECCO(Estimation of the Circulation and Climate of the Ocean) model agrees very well with that from *** observes obvious seasonal mass-induced sLV in the sCs with annual amplitude of 2.7±0.4 cm,which is consistent with the annual amplitude of 2.7±0.3 cm estimated from the steric-corrected *** the inter-annual timescales,the mean sLV in the sCs shows a large oscillation,which is mainly caused by the steric *** trend of mean sLV inferred from altimetry in the sCs is 5.5±0.7 mm/yr for the period of 1993-2009,which is significantly higher than the global sea level rise rate of 3.3±0.4 mm/yr in the same *** is no obvious trend signal in the mass-induced sLV detected from GRACE that indicates the water exchange between the sCs and its adjacent seas and land is in balance within the study period.

关键词： altimetry GRACE ECCO the south China sea sea level variation

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Monthly gravity field recovery from GRACE orbits and K-band measurements using variational equations approach

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geodesy and Geodynamics 2015年第4期6卷 253-260页

作者： Wang Changqing xu houze zhong min feng wei state key laboratory of geodesy and earth's dynamics Institute of Geodesy and GeophsicsChinese Academy of Sciences University of chinese academy of sciences

The Gravity Recovery and Climate Experiment（GRACE） mission can significantly improve our knowledge of the temporal variability of the earth＇s gravity *** obtained monthly gravity field solutions based on variational equations approach from GPs-derived positions of GRACE satellites and K-band range-rate *** impact of different fixed data weighting ratios in temporal gravity field recovery while combining the two types of data was investigated for the purpose of deriving the best combined *** monthly gravity field solution obtained through above procedures was named as the institute of geodesy and geophysics（IGG） temporal gravity field *** temporal gravity field models were compared with GRACE Release05（RL05） products in following aspects：（i） the trend of the mass anomaly in China and its nearby regions within 2005-2010; （ii） the root mean squares of the global mass anomaly during 2005-2010; （iii） time-series changes in the mean water storage in the region of the Amazon Basin and the sahara Desert between 2005 and *** results showed that IGG solutions were almost consistent with GRACE RL05 products in above aspects（i）-（iii）.Changes in the annual amplitude of mean water storage in the Amazon Basin were 14.7 ± 1.2 cm for IGG,17.1 ± 1.3 cm for the Centre for space Research（CsR）,16.4 ± 0.9 cm for the GeoForschungsZentrum（GFZ） and 16.9 ± 1.2 cm for the Jet Propulsion laboratory（JPL） in terms of equivalent water height（EWH）,*** root mean squares of the mean mass anomaly in sahara were 1.2 cm,0.9 cm,0.9 cm and 1.2 cm for temporal gravity field models of IGG,CsR,GFZ and JPL,*** suggested that IGG temporal gravity field solutions were at the same accuracy level with the latest temporal gravity field solutions published by CsR,GFZ and JPL.

关键词： Gravity recovery and climate experiment (GRACE) Temporal gravity field Variational equations approach Water storage changes Equivalent water height(EWH)Data weight ratio Geoid height per degree IGG temporal gravity model

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2005—2017年两次强ENsO事件对中国区域陆地水储量变化影响的卫星重力观测

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地球物理学报 2020年第1期63卷 141-154页

作者：陈威钟敏冯伟钟玉龙许厚泽中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室武汉430077 中国科学院大学北京100049

近年来极端气候事件的频发对全球和区域性水循环产生了重大影响,特别是2005—2017年间两次强ENsO(El Nino-southern Oscillation)事件使得全球陆地水储量出现了较大的年际波动.GRACE(Gravity Recovery and Climate Experiment)重力卫星... 详细信息

近年来极端气候事件的频发对全球和区域性水循环产生了重大影响,特别是2005—2017年间两次强ENsO(El Nino-southern Oscillation)事件使得全球陆地水储量出现了较大的年际波动.GRACE(Gravity Recovery and Climate Experiment)重力卫星随着数据质量的提高、后处理方法的完善和超过十年的连续观测,捕捉陆地水储量异常的能力明显提高,这为研究2005—2017年间两次强ENsO事件对中国区域陆地水储量变化的影响提供了观测基础.本文综合利用GRACE卫星重力数据、GLDAs水文模型和实测降水资料分析了中国区域陆地水储量年际变化和与ENsO的关系.研究发现:长江流域中、下游地区和东南诸河流域与ENsO存在较高的相关性,与ENsO的相关系数最大值分别为0.55、0.78、0.70,较ENsO分别滞后约7个月、5个月和5个月.其中长江流域下游地区与ENsO的相关性最强,2010/11 La Nina和2015/16 El Nino两次强ENsO事件使得陆地水储量分别发生了约-24.1亿吨和27.9亿吨的波动.在2010/11 La Nina期间,长江流域下游地区和东南诸河流域陆地水储量异常约在2011年4—5月达到谷值,而长江流域中游地区晚1~2月达到谷值.在2015/16 El Nino期间,长江流域中、下游地区和东南诸河流域陆地水储量从2015年9月到2016年7月持续出现正异常信号.其中,2015年秋冬季(2015年9月至2016年1月)陆地水储量异常明显是受此次El Nino同期影响的结果;2016年春季(4—5月)陆地水异常是受到此次厄尔尼诺峰值的滞后影响所致;2016年7月的陆地水储量异常则与西北太平洋存在的异常反气旋环流有关.

关键词： GRACE 陆地水储量异常 ENsO事件相关性

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