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Relationship between polar motion and key hydrological elements at multiple scales

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Science China Earth Sciences 2022年第5期65卷 882-898页

作者： Shanshan DENG suxia liu Xingguo MO Gongbing PENG Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of ScienceBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100190China Sino-Danish College University of Chinese Academy of SciencesBeijing 100049China

Changes in the elements of the Earth system are closely *** the key factors linked with hydrological changes is significant for in-depth analysis of hydrological *** study chooses polar motion,which is the movement of the Earth’s rotational axis relative to its crust,as a key factor in the investigation of the physical processes of its interaction with several hydrological ***,the statistical relationships between polar motion and multi-hydrological elements(i.e.,precipitation,evaporation,runoff,and terrestrial water storage)are investigated,using trend analysis,mutation analysis,cycle analysis,and correlation analysis methods,from basinal to global and from intra-annual to inter-annual ***,their interactions are *** study quantifies the effect of hydrological changes on polar motion using the excitation *** explores the effect of polar motion on hydrological changes based on the theory of equilibrium tides and atmospheric *** results show that they are significantly correlated and abruptly changed at a similar ***,regional to global hydrological changes can significantly excite polar *** April 2002 to June 2020,the global terrestrial water storage decreased significantly(by approximately−4.68 mm yr^(−1)),which significantly drove polar motion towards the direction of the Greenwich Meridian(by approximately 4.32 mas yr^(−1)).Changes in regional terrestrial water storage also contributed significantly to directional changes in polar motion around 2005 and ***,polar motion can perturb the Earth’s centrifugal force system and generate equilibrium tides,and thus further cause changes in sea-level pressure,wind,and water vapor *** show that polar motion-induced water vapor flux divergences correlate significantly with actual precipitation and terrestrial water storage changes in the Yangtze River and the Pearl River *** correlations are also significant when

关键词： Polar motion Hydrological changes Polar motion deformation Excitation Function

Indexing the relationship between polar motion and water mass change in a giant river basin

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Science China Earth Sciences 2018年第8期61卷 1065-1077页

作者： suxia liu Shanshan DENG Xingguo MO Haoming YAN Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources Research(IGSNRR) Chinese Academy of Sciences University of Chinese Academy of Sciences (UCAS) College of Resources and Environment Sino-Danish College State Key Laboratory of Geodesy and Earth’s Dynamics Institute of Geodesy and Geophysics Chinese Academy of Sciences

Previous studies on the relationship between polar motion and water mass change have mainly concentrated on the excitation of polar motion via global terrestrial water storage changes(TWSC). In view of the uneven distribution of global terrestrial water storage, the relationship between regional water mass change and polar motion needs to be further explored owing to the lack of documented results. In addition, given the uncertainty in the estimation of TWSC, it is required to develop appropriate indices to describe water mass change from different perspectives. The Amazon River basin(referred to Amazon hereafter), containing the world's largest river, located at around the 90°W longitude, is selected as the study area. Water vapor flux, precipitation, runoff and TWSC are selected as the indices of water mass changes to reveal the relationship between polar motion and water mass change in this giant basin. The Mann-Kendall(M-K) method, the accumulated anomaly analysis method and the curvature method are used to identify the abrupt change points; the least squares method is used to estimate the trends,and the Fast Fourier Transform(FFT) and the Ensemble Empirical Mode Decomposition(EEMD) are used to perform a periodic analysis, for all the above indices. It is shown that, of all the indices from 1948 to 2011, water vapor flux is the most closely related index to polar motion. In detail, precipitation and water vapor flux contain beat periods of polar motion; water vapor flux,precipitation and polar motion have a common M-K test abrupt change point(occurring in ca. 1968) at the 0.05 significance level; water vapor flux has a similar accumulated anomaly curve with that of polar motion; and water vapor flux is more highly correlated with polar motion than most other indexes. It is found, just like global TWSC, the χ2 component of the excitation via water vapor flux and water storage change in the Amazon follows that of observed polar motion; χ1 does not follow. However,

关键词： Polar motion the Amazon River Basin Location of Vapor-based Inter Tropical Convergence Zone(LVITCZ) Terrestrial water storage changes(TWSC) Water vapor flux

Global sensitivity and uncertainty analysis of the VIP ecosystem model with an expanded soil nitrogen module for winter wheat-summer maize rotation system in the North China Plain

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Pedosphere 2021年第5期31卷 822-838页

作者： Lihong HE Xingguo MO Shi HU suxia liu Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101(China) College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049(China) Sino-Danish Center University of Chinese Academy of SciencesBeijing 100049(China)

Accurately simulating the soil nitrogen(N)cycle is crucial for assessing food security and resource utilization *** accuracy of model predictions relies heavily on model *** sensitivity and uncertainty of the simulations of soil N cycle of winter wheat-summer maize rotation system in the North China Plain(NCP)to the parameters were ***,the N module in the Vegetation Interface Processes(VIP)model was expanded to capture the dynamics of soil N cycle calibrated with field measurements in three ecological stations from 2000 to ***,the Morris and Sobol algorithms were adopted to identify the sensitive parameters that impact soil nitrate stock,denitrification rate,and ammonia volatilization ***,the shuffled complex evolution developed at the University of Arizona(SCE-UA)algorithm was used to optimize the selected sensitive parameters to improve prediction *** results showed that the sensitive parameters related to soil nitrate stock included the potential nitrification rate,Michaelis constant,microbial C/N ratio,and slow humus C/N ratio,the sensitive parameters related to denitrification rate were the potential denitrification rate,Michaelis constant,and N2 O production rate,and the sensitive parameters related to ammonia volatilization rate included the coefficient of ammonia volatilization exchange and potential nitrification *** on the optimized parameters,prediction efficiency was notably increased with the highest coefficient of determination being approximately ***,the average relative interval length at the 95% confidence level for soil nitrate stock,denitrification rate,and ammonia volatilization rate were 11.92,0.008,and 4.26,respectively,and the percentages of coverage of the measured values in the 95% confidence interval were 68%,86%,and 92%,*** identifying sensitive parameters related to soil N,the expanded VIP model optimized by the SCE-UA algorithm can effectively si

关键词： ammonia volatilization denitrification rate global sensitivity analyses shuffled complex evolution developed at the University of Arizona(SCE-UA)algorithm vegetation interface processes model

Comparing surface erosion processes in four soils from the Loess Plateau under extreme rainfall events

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International Soil and Water Conservation Research 2021年第4期9卷 520-531页

作者： Liying Sun John L.Zhou Qiangguo Cai suxia liu Jingan Xiao Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China School of Civil and Environmental Engineering University of Technology Sydney15 BroadwayNSW 2007Australia

This research aims to improve erosion control practice in the Loess Plateau,by studying the surface erosion processes,including splash,sheet/interrill and rill erosion in four contrasting soils under high rainfall intensity(120 mm h^(−1))with three-scale indoor artificial *** contrasting soils as sandy loam,sandy clay loam,clay loam and loamy clay were collected from different parts of the Loess *** results showed that sediment load was significantly impacted by soil properties in all three *** rate(4.0-21.6 g m^(−2∙)min^(−1))was highest in sandy loam from the north part of the Loess Plateau and showed a negative power relation with the mean weight diameter of aggregates after 20 min of rainfall *** average sediment load by sheet/interrill erosion(6.94-42.86 g m^(−2∙)min^(−1))was highest in clay loam from middle part of the Loess Plateau,and the stable sediment load after 20 min showed a positive power relation with the silt content in *** average sediment load increased dramatically by rill and interrill erosion(21.03-432.16 g m^(−2∙)min^(−1)),which was highest in loamy clay from south part of the Loess *** average sediment load after the occurrence of rill showed a positive power relation with clay content and a negative power relation with soil organic matter *** impacts of slope gradient on the runoff rate and sediment load also changed with soil *** critical factors varied for different processes,which were the aggregate size for splash erosion,the content of silt particles and slope gradient for sheet/interrill erosion,and the content of clay particles,soil organic matter and slope gradient for rill *** on the results of the experiments,specific erosion control practices were proposed by targeting certain erosion processes in areas with different soil texture and different distribution of slope *** findings from this study should support the improvement of erosion

关键词： Soil erosion process Particle size Surface erosion Cropland management Loess Plateau

USP3 deubiquitinates and stabilizes the adapter protein ASC to regulate inflammasome activation

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Cellular & Molecular Immunology 2022年第10期19卷 1141-1152页

作者： Wanxin Zhuang Lei Zhang Yi Zheng Bingyu liu Chunhong Ma Wei Zhao suxia liu Feng liu Chengjiang Gao Key Laboratory of Infection and Immunity of Shandong Province&Key Laboratory for Experimental Teratology of Ministry of Education Shandong UniversityJinanShandong250012PR China Department of Immunology School of Biomedical SciencesShandong UniversityJinanShandong250012PR China

Inflammasomes are essential components of the innate immune system and its defense against infections,whereas the dysregulation of inflammasome activation has a detrimental effect on human *** activation of inflammasomes is subjected to tight regulation to maintain immune homeostasis,yet the underlying mechanism remains ***,we identify USP3 as a direct deubiquitinating enzyme(DUB)for ASC,the central adapter mediating the assembly and activation of most ***3 removes the K48-linked ubiquitination on ASC and strengthens its stability by blocking proteasomal ***,USP3 promotes inflammasome activation,and this function was confirmed in mouse models of aluminum(Alum)-induced peritonitis,*** infection and flagellin-induced pneumonia in *** work unveils that USP3 functions as a key regulator of ASC ubiquitination and maintains the physiological role of ASC in mediating inflammasome activation,and we propose a new mechanism by which the ubiquitination of ASC regulates inflammasome activation.

关键词： ASC inflammasome K48-linked ubiquitination proteasomal degradation USP3

Contributions of climate change and human activities to ET and GPP trends over North China Plain from 2000 to 2014

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Journal of Geographical Sciences 2017年第6期27卷 661-680页

作者： CHEN Xuejuan MO Xingguo HU Shi liu suxia Key Laboratory of Water Cycle and Related Land Surface Processes Natural Resources Research CAS Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China College of Resources and Environment/Sino-Danish Center University of Chinese Academy of Sciences Beijing 100049 China

College of Resources and Environment/Sino-Danish Center, Univers Beijing 100049, China nstitute of Geographic Sciences and ty of Chinese Academy of SciencesAbstract： Quantifying the contributions of climate change and human activities to ecosystem evapotranspiration （ET） and gross primary productivity （GPP） changes is important for adaptation assessment and sustainable development. Spatiotemporal patterns of ET and GPP were estimated from 2000 to 2014 over North China Plain （NCP） with a physical and remote sensing-based model. The contributions of climate change and human activities to ET and GPP trends were separated and quantified by the first difference de-trending method and multivariate regression. Results showed that annual ET and GPP increased weakly, with climate change and human activities contributing 0.188 mm yr-2 and 0.466 mm yr-2 to ET trend of 0.654 mm yr-2, and -1.321 g C m-2 yr-2 and 7.542 g C m-2 yr-2 to GPP trend of 6.221 g C m-2 yr-2, respectively. In cropland, the increasing trends mainly occurred in wheat growing stage; the contributions of climate change to wheat and maize were both negative. Precipitation and sunshine duration were the major climatic factors regulating ET and GPP trends. It is concluded that human activities are the main drivers to the long term tendencies of water consumption and gross primary productivity in the NCP.

关键词： evapotranspiration gross primary production contribution process-based model multi-regression North China Plain

Assessing the impact of climate change on potential evapotranspiration in Aksu River Basin

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Journal of Geographical Sciences 2011年第4期21卷 609-620页

作者： ZHANG Shouhong liu suxia MO Xingguo SHU Chang SUN Yang ZHANG Chun Key Laboratory of Water Cycle & Related Land Surface Processes Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

Evapotranspiration is one of the key components of hydrological processes. Assessing the impact of climate factors on evapotranspiration is helpful in understanding the impact of climate change on hydrological processes. In this paper, based on the daily meteorological data from 1960 to 2007 within and around the Aksu River Basin, reference evapotranspiration （RET） was estimated with the FAO Penman-Monteith method. The temporal and spatial variations of RET were analyzed by using ARCGIS and Mann-Kendall method. Multiple Regression Analysis was employed to attribute the effects of the variations of air temperature, solar radiation, relative humidity, vapour pressure and wind speed on RET. The results showed that average annual RET in the eastern plain area of the Aksu River Basin was about 1100 mm, which was nearly twice as much as that in the western mountainous area. The trend of annual RET had significant spatial variability. Annual RET was reduced significantly in the southeastern oasis area and southwestern plain area and increased slightly in the mountain areas. The amplitude of the change of RET reached the highest in summer, contributing most of the annual change of RET. Except in some high elevation areas where relative humidity predominated the change of the RET, the variations of wind velocity predominated the changes of RET almost throughout the basin. Taking Kuqa and Ulugqat stations as an example, the variations of wind velocity accounted for more than 50% of the changes of RET.

关键词： climate change reference evapotranspiration Penman-Monteith method Aksu River Basin

1990—2020年天山北坡地下水储量估算及其时空演变规律

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地理学报 2023年第7期78卷 1744-1763页

作者：王宗侠刘苏峡中国科学院地理科学与资源研究所中国科学院陆地水循环及地表过程重点实验室北京100101 中国科学院大学资源与环境学院北京100049 中国科学院大学中丹学院北京100049

天山北坡位于中国新疆,地处亚欧桥的国门,社会经济发展迅速,其绿洲经济和灌溉农业对地下水资源的依赖程度高。揭示1990—2020年地下水储量的演变规律对维持区域可持续发展具有重要意义。但由于长时序和较高分辨率的区域地下水观测数据匮... 详细信息

天山北坡位于中国新疆,地处亚欧桥的国门,社会经济发展迅速,其绿洲经济和灌溉农业对地下水资源的依赖程度高。揭示1990—2020年地下水储量的演变规律对维持区域可持续发展具有重要意义。但由于长时序和较高分辨率的区域地下水观测数据匮乏,使得该任务又极具挑战性。本文基于重建的陆地水储量(TWS)变化数据、ERA5-Land再分析数据和其他相关的土壤质地、海拔高程、植被指数和冰川分布等辅助数据,建立了随机森林降尺度模型,据此估算了天山北坡1990—2020年的8 km分辨率地下水储量(GWS)变化,分析了天山北坡GWS的时空演变规律。估算的GWS变化与实测地下水位序列的时间变化具有较高的一致性,二者的相关系数最高达到0.68。天山北坡GWS具有明显的年内变化和年际变化。GWS在夏季和春季较高,在秋季和冬季较低,峰值出现在6月,最低值出现在10月。1990—2020年天山北坡有85%以上的地区GWS发生了显著下降,全区平均的变化趋势为-0.38 cm/a。其中,艾比湖水系和中段诸河区GWS下降最剧烈,额敏河流域下降速率最小;耕地下降速率最大,草地次之,裸地下降速率最小。日益增强的农业耗水活动是1990—2020年天山北坡GWS持续下降的主要驱动因素。相比于季节变化和亚季节变化,长期趋势性变化是天山北坡GWS时间变化的主导模式。但对于额敏河流域,GWS变化由三者共同主导。特别值得指出的是,在冰川覆盖区联合重力卫星与水储量组分方程开展GWS估算工作面临的挑战之一是缺乏长序列、高分辨率的冰川水储量数据,以往大部分研究忽视了冰川覆盖的影响。本文研究表明,若忽视冰川的影响,将导致天山北坡的平均GWS变化速率至少高估27.56%,应引起重视。

关键词：地下水储量陆地水储量 GRACE 降尺度天山北坡

Estimating the minimum in-stream flow requirements via wetted perimeter method based on curvature and slope techniques

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Journal of Geographical Sciences 2006年第2期16卷 242-250页

作者： liu suxia＇ MO Xingguo XIA Jun liu Changming LINZhonghui MEN Baohui JI Lina Key Lab. of Water Cycle ＆ Related Land Surface Processes Institute of Geographic Sciences and Natural Resources Research （IGSNRR） CAS Beijing 100101 China Key Lab of Ecological Net Observation and Modeling IGSNRR CASBeiing 100101 China College of Water Conservancy and Architectural Engineering Northwest A ＆ F University Xi＇an 712100 China

Under the assumptions of triangular cross section channel and uniform stable flow, an analytical solution of the minimum ecological in-stream flow requirement （MEIFR） is deduced. Based on the analytical solution, the uncertainty of the wetted perimeter method is analyzed by comparing the two techniques for the determination of the critical point on the relationship curve between wetted perimeter, P and discharge, Q. It is clearly shown that the results of MEIFR based on curvature technique （corresponding to the maximum curvature） and slope technique （slope being 1） are significantly different. On the P-Q curve, the slope of the critical point with the maximum curvature is 0.39 and the MEIFR varied prominently with the change of the slope threshold. This indicates that if a certain value of the slope threshold is not available for slope technique, curvature technique may be a better choice. By applying the analytical solution of MEIFR in the losing rivers of the Western Route South-to-North Water Transfer Project in China, the MEIFR value via curvature technique is 2.5%-23.7% of the multi-year average annual discharge, while that for slope technique is 11%-105.7%. General conclusions would rely on the more detailed research for all kinds of cross-sections.

关键词： uncertainty wetted perimeter minimum in-stream flow requirements analytical solution Western Routhe South-to-North Water Transfer Project in China