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| 1 | Low-frequency sea level variation and its correlation with climate events in the Pacific显示文摘Global mean sea level(GMSL) has not only significant secular trend and seasonal variations,but also inter-annual and decadal variations.This paper reconstructs the time series of GMSL variations between 1948 and 2007 by combining satellite altimeter measurements and tide gauge observations.Based on the time series,the acceleration of GMSL rise in the second half of 20th century is estimated to be 0.010±0.009 mm/a 2,and multi-scale low frequency sea level oscillations including decadal variations are detected,and the high-rate of GMSL rise during 1993-2003 is locate in the ascending phase of low frequency oscillation.Then,using the reconstructed GMSL time series after removing the secular trend from satellite altimetry and tide gauges measurements,it shows that low frequency signal of sea level variation has strong correlations with the index of El Ni o/Southern Oscillation(ENSO) and Pacific Decadal Oscillation(PDO).But in several time periods,they have large difference due to effects of both high frequency occurrence of El Ni o and La Ni a phenomenon and short term switch of PDO events. | JIN TaoYong LI JianCheng JIANG WeiPing CHU YongHai | 2012 | Chinese Science Bulletin2012，57，27： | 6 |
| 2 | Prediction of Gravity Anomalies Over the South China and Philippine Seas from Multi-satellite Altimeter Sea Surface Heights显示文摘2.5 ×上的严肃异例在一个非潮汐的系统的 2.5 弧分钟格子从多卫星测高法数据在华南和菲律宾的海上被导出。vertical 的偏转的诺思和东方部件在转线路地点,和 gridded 从导出高度表的海面高度被计算到 2.5 ×上 2.5 弧分钟决定格子。进 2.5 弧分钟分辨率当时是的 2.5 × 的vertical 和严肃异例 gridded 的偏转的 导出EGM96 的部件在一个移开恢复过程把全球重力势模型数量用作引用经由1D快速傅里叶变换技术实现反的 Vening Meinesz 公式从 gridded 在华南和菲律宾的海上预言严肃异例vertical 的偏转的导出高度表的部件。统计比较在之间导出高度表并且舷侧严肃异例证明有在他们之间的 5.7 mgals 的一个 root-mean-square 协议。 | Isaac Dadzie LI Jiancheng CHU Yonghai | 2008 | Geo-Spatial Information Science2008，11，3： | 1 |
| 3 | Inducible IL-23p19 expression in human microglia via p38 MAPK and NF-κB signal pathways显示文摘 | Li Yonghai Chu Niansheng Hu Aihua | 2008 | Exp Mol Pathol2008，84，1： | 1 |
| 4 | Extraction of two tsunamis signals generated by earthquakes around the Pacific rim显示文摘As one of the ocean sudden natural disasters,the tsunami is not easily to differentiate from the ocean variation in the open ocean due to the tsunami wave amplitude is less than one meter with hundreds of kilometers wavelength. But the wave height will increases up to tens of meters with enormous energy when the tsunami arrives at the coast. It would not only devastate entire cities near coast,but also kill millions of people. It is necessary to forecast and make warning before the tsunami arriving for many countries and regions around the Pacific rim. Two kinds of data were used in this study to extract the signals of 2011 Tohoku tsunami and 2014Iquique tsunami. Wave undulations from DART( Deep-ocean Assessment and Reporting of Tsunamis) buoys and SLA from altimetry could extract the tsunami signals generated by this two earthquake. The signals of Tohoku tsunami were stronger than that of Iquique tsunami probably due to the 2011 Tohoku tsunami was generated by a magnitude 9. 0 earthquake and the 2014 Iquique tsunami was triggered by a magnitude 8. 2 earthquake. | Chu Yonghai Li Jiancheng | 2014 | Geodesy and Geodynamics2014，5，2： | 1 |
| 5 | Evaluation of the geopotential value W_0^(LVD) of China显示文摘Estimation of the zero-height geopotential value W_0^(LVD) for the CVD(China Vertical Datum) plays a fundamental role in the connection of traditional height reference systems into a global height system.Estimation the W_0^(LVD) of China is based on the computation of the mean geopotential offset between the value W_0= 62636856.0 m^2 s^(-2), selected as reference in this study, and the unknown geopotential value W_0^(LVD). This estimation is based on the combination of ellipsoidal heights, levelled heights(referring to the CVD), and some physical parameters, such as geopotential values, gravity values, and geoid undulations.The geoid undulations derived from the GGM(Global Geopotential Models). This combination is performed through three approaches: The first one is based on the theory of Molodensky, and the second one compares levelled heights and geopotential values derived from the GGMs, while the third one analyses the differences between GPS/Levelling and GGMs geoid undulations. The approaches are evaluated at 65 benchmarks(BMs) covered around Qingdao where the tide gauge is used to observe the local mean sea level of China. The results from three approaches are very similar. Furthermore, the W_0^(LVD)determined for the China local vertical datum was 62636852.9462 m^2 s^(-2), indicates a bias of about3.0538 m^2/s^(-2) compared to the conventional value of 62636856.0 m^2 s^(-2). | Lin He Yonghai Chu Nan Yu | 2017 | Geodesy and Geodynamics2017，8，6： | 1 |
| 6 | Solving Three Types of Satellite Gravity Gradient Boundary Value Problems by Least-Squares显示文摘The principle and method for solving three types of satellite gravity gradient boundary value problems by least-squares are discussed in detail. Also, kernel function expressions of the least-squares solution of three geodetic boundary value problems with the observations {Γ zz },{Γ xz , Γ yz} and {Γ xx -Γ yy ,2 Γxy}are presented. From the results of recovering gravity field using simulated gravity gradient tensor data, we can draw a conclusion that satellite gravity gradient integral formulas derived from least-squares are valid and rigorous for recovering the gravity field. | XU Xinyu LI Jiancheng ZOU Xiancai CHU Yonghai | 2007 | Geo-Spatial Information Science2007，10，3： | 0 |
| 7 | Reply to: Parker A. Comment on “Low-frequency sea level variation and its correlation with climate events in the Pacific”显示文摘First, we would like to thank Parker for his discussion and comments on our work. Parker’s main concern [1] is that the sea level is oscillating with important multi-decadal periodicities but absolutely not positively accelerating. He also argued that the global mean sea level (GMSL) acceleration computed by Jin et al. [2] seemed too large. His | JIN TaoYong LI JianCheng JIANG WeiPing CHU YongHai | 2013 | Chinese Science Bulletin2013，58，14： | 0 |
| 8 | Ice-sheet surface elevation change from crossover of ENVISAT data显示文摘Understanding the current state of the polar ice sheets is critical for determining their contribution to sea-level rise and predicting their response to climate change.Surface elevation time series especially can be used to study ice-sheet dynamics and the mass or volume balance of the ice sheets,which are relevant to global climate change and sea-level rise.During the last two decades,satellite radar altimetry or airborne laser altimetry could obtain accuracy by an order of magnitude greater than the traditional airborne barometric altimetry,which has a precision of typically several tens of meters at best and only a limited coverage.The widest coverage comes from satellites,especially from the ERS1/2 and ENVISAT,which extends to 81.5°of latitude,covering almost all of Greenland and most of Antarctica.In this paper,an algorithm for time series analysis based on crossover was used to obtain 4-year(September 2002–March 2007)ice-sheet elevation changes from ENVISAT data.The height of the whole Antarctic ice sheet has a decline of about 0.4±0.43 cm from September 2002 to March 2007.The time series data present clearly a seasonal and annual signal feature;that the ice sheet thickens in March.From the time series data,the seasonal and annual signal can be observed clearly. | CHU Yonghai LI Jiancheng | 2012 | Geo-Spatial Information Science2012，15，1： | 0 |
| 9 | Improving Gravity Anomalies Over China Marginal Sea from Retracked Geosat and ERS-1 Data显示文摘The quality of altimeter data and ocean tide model is critical to the recovery of coastal gravity anomalies. In this contribution, three retracking methods (threshold, improved threshold and Beta-5) are investigated with the aim of improving the altimeter data over a shallow water area. Comparison indicates that the improved threshold is the best retracking method over China Sea. Two ocean tide models, NAO99b and CSR4.0, are analyzed. Results show that different tide models used in the processing of altimeter data may result in differences more than 10 mGal in recovered coastal gravity anomalies. Also, NAO99b is more suitable than CSR4.0 over the shallow water area of China Sea. Finally, gravity anomalies over China Sea are calculated from retracked Geosat/GM and ERS-1/GM data by least squares collocation. Comparison with shipborne gravimetry data demonstrates that gravity anomalies from retracked data are significantly superior to those from non-retracked data. Our results have the same order as the other two altimeter-derived gravity models: Sandwell&Smith(V16) and DNSC08. | WANG Haihong YANG Yuande HWANG Chenway CHU Yonghai MA Xinying | 2010 | Geo-Spatial Information Science2010，13，2： | 0 |
| 10 | Review of the Research Progress on Static Earth Gravity Field and Vertical Datum in China during 2019—2023显示文摘The contribution presents the representative research progress on global static gravity field modeling,regional geoid/quasigeoid determination,vertical datum study,as well as the theory,algorithm and software for gravity field study in China from 2019 to 2023,which are the highlights of the chapter 6“Progress in Earth Gravity Model and Vertical Datum”in the“2019—2023 China National Report on Geodesy”that submitted to the International Association of Geodesy(IAG).In addition,suggestions are proposed to promote the research in the fields of earth gravity field,geoid/quasigeoid and vertical datumin China according to trends of international geodesy and related disciplines. | Tao JIANG Xinyu XU Yonghai CHU Taoyong JIN Wei LIANG Yihao WU Yanguang FU Yongqi ZHAO Xinwei GUO | 2023 | Journal of Geodesy and Geoinformation Science2023，6，3： | 0 |
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