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Physical processes associated with movement of maximum wind of Typhoon Rammasun(2014)

Frontiers of Earth Science 2023年第2期17卷 407-416页

作者： Xin QUAN Xiaofan LI Guoqing ZHAI Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province School of Earth SciencesZhejiang UniversityHangzhou 310027China

In this study,the movement of the maximum wind of Typhoon Rammasun(2014)was measured by the radial movement of the maximum symmetric rotational kinetic *** weather research and forecasting(WRF)model was used to simulate Typhoon Rammasun,and validated simulation data for the lower troposphere were analyzed to examine the physical processes responsible for the radial movement of the maximum *** radii,where maximum symmetric rotational kinetic energy and its maximum tendency were located,were compared to explain radial *** tendency in the lower troposphere is controlled by the flux convergence of symmetric rotational kinetic energy and the conversion from symmetric divergent kinetic energy to symmetric rotational kinetic energy,as well as frictional dissipation in the symmetric rotational kinetic energy *** inward movement before rapid intensification(RI)resulted from radial flux convergence;cyclonic circulation develops while moving *** maximum symmetric rotational kinetic energy and RI were caused by the conversion,which was observed to be proportional to the symmetric rotational kinetic *** increased terrain-induced friction dissipation,which led to outward movement and ended the RI.

关键词： typhoon radial movement of maximum wind symmetric rotational kinetic energy rapid intensification kinetic energy budget flux convergence conversion

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The Impact of Tibetan Plateau Snow Cover on the Summer Temperature in Central Asia

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Advances in Atmospheric Sciences 2022年第7期39卷 1103-1114页

作者： Xuke LIU Xiaojing JIA Min WANG Qifeng QIAN Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province School of Earth SciencesZhejiang UniversityHangzhouZhejiang 310027China

The current work examines the impact of the snow cover extent(SCE)of the Tibetan Plateau(TP)on the interannual variation in the summer(June−July−August)surface air temperature(SAT)over Central Asia(CA)(SAT_CA)during the 1979−2019 *** leading mode of the summer SAT_CA features a same-sign temperature anomalies in CA and explains 62%of the total variance in SAT_*** atmospheric circulation associated with a warming SAT_CA is characterized by a pronounced high-pressure system dominating *** high-pressure system is accompanied by warm advection as well as descending motion over CA,favoring the warming of the SAT_*** shows that the interannual variation in the summer SAT_CA is significantly positively correlated with the April SCE over the central-eastern *** April,higher than normal SCE over the central-eastern TP has a pronounced cooling effect on the column of the atmosphere above the TP and can persist until the following early *** and positive height anomalies appear above and to the west of the *** the following months,the perturbation forcing generated by the TP SCE anomalies lies near the western center of the Asian subtropical westerly jet(SWJ),which promotes atmospheric waves in the zonal direction guided by the Asian *** with this atmospheric wave,in the following summer,a significant high-pressure system dominates CA,which is a favorable condition for a warm summer SAT_CA.

关键词： snow cover extent the Tibetan Plateau Central Asia SAT summer

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A comprehensive overview of seismic ambient noise method: Maturity or stagnation?

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Journal of Applied Geophysics 2025年 239卷

作者： Wu, Ruijie Cheng, Feng Xia, Jianghai Guan, Jianbo Zhao, Ke Zhao, Longfeng Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province School of Earth Sciences Zhejiang University 866 Yuhangtang Rd Zhejiang Hangzhou310027 China School of Management Northwestern Polytechnical University Xi'an710129 China

Seismic ambient noise, once regarded merely as interference, has emerged as a crucial geophysical technique, attracting substantial interest from researchers. Despite its advancements, there is a perceptible deceleration in the field, sparking debates over its prospective trajectory. This review employs the bibliometric analysis approach to deeply explore the evolution and trends of the seismic ambient noise method. We outline publication trends and identify three distinct developmental phases that have markedly shaped the seismic ambient noise research. Through structured network analysis, we provide a detailed examination of the thematic trends and the evolving landscapes of the field. We also present a critical discussion on present challenges and opportunities, aiming to highlight areas ripe for innovation. The findings are intended to not only illuminate the potential for further advancements but also to stimulate continued research that could extend the boundaries of the discipline. © 2025 Elsevier B.V.

关键词： Earthquakes

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The optical and molecular signatures of DOM under the eutrophication status in a shallow,semi-enclosed coastal bay in southeast China

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Science China Earth Sciences 2021年第7期64卷 1090-1104页

作者： Chen ZHAO Yuping ZHOU Yu PANG Yanzhen ZHANG Wei HUANG Yuntao WANG Ding HE Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province School of Earth SciencesZhejiang UniversityHangzhou 310027China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310027China

We applied stable carbon isotopes,ultraviolet-visible absorption(UV-Vis),fluorescence excitation-emission matrices spectroscopy(EEMs),and Fourier transform ion cyclotron resonance mass spectrometry(FT-ICR-MS)to investigate the chemical composition and sources of the dissolved organic matter(DOM)in both the water column and pore water in Xiangshan Bay,a representative semi-enclosed and eutrophic bay in zhejiang province,*** protein-like fluorescent component(C1)and two humic-like fluorescent components(C2 and C3)were identified by PARAFAC *** concentration of dissolved organic carbon(DOC),the relative intensities of C2,C3,and black carbon-like compounds are all negatively correlated with salinity,indicating that there is a dilution effect of terrestrial signals by seawater in Xiangshan *** differences in light penetration ability of Xiangshan Bay cause different degrees of photo-degradation,which may play an important role in the transformation of organic matter in Xiangshan *** weak correlation between the C1 fluorescent component and salinity indicates that autochthonous sources cannot dominate the protein-like FDOM in the Xiangshan Bay drainage *** sources(such as anthropogenic inputs and release of pore water)also affect the distribution of the protein-like fluorescent component under eutrophication *** relative proportion of the protein-like fluorescent component in Xiangshan Bay is on a medium level in China and anthropogenic inputs may be a significant source of DOM in coastal bays.

关键词： Xiangshan Bay Dissolved organic matter Optical properties Molecular composition Transporting and processing

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The fate of eclogites in the lithosphere

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Science China Earth Sciences 2024年第3期67卷 879-884页

作者： Zhensheng WANG Yixian XU State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesWuhan 430074China Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province School of Earth SciencesZhejiang UniversityHangzhou 310058China

1. Eclogites and the concept of viscous drainage Eclogites are a distinctive rock type, mainly composed of garnet and omphacite and formed through ultra-high-pressure metamorphism, wherein oceanic or continental crust... 详细信息

关键词： crustal garnet rock

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Decomposing Images into Triangles by Delaunay Point Processes 24

Decomposing Images into Triangles by Delaunay Point Processe...

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2020 24th ISPRS Congress on Technical Commission II

作者： Chai, Dengfeng Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province School of Earth Sciences Zhejiang University China

We propose a method for decomposing images into triangles. Contrary to superpixel methods, our output representation both preserves the geometric information disseminated in input images, and has an attractive storage capacity. Our method relies on the flexibility and efficiency of Delaunay point processes to address the problem. These stochastic models distribute points interacting between each other through Delaunay triangulations. The mechanism for distributing points combines several complementary ingredients including image discontinuity preservation, radiometric homogeneity inside atomic regions as well as priors on the shape of these regions. Said differently, sampled points and induced shapes work in tandem. The potential of our approach is shown through comparisons with existing oversegmentation methods and applications to vision problems. © 2020 Copernicus GmbH. All rights reserved.

关键词： Stochastic models

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On the Surface Waves Retrieved from High-speed Trains Running on Viaducts and Ground Surface 10

On the Surface Waves Retrieved from High-speed Trains Runnin...

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10th International Conference on Environmental and Engineering Geophysics, ICEEG 2023

作者： You, Baiyang Xia, Jianghai Mi, Binbin Liu, Ya Zhang, Hao Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province School of Earth Sciences Zhejiang University Hangzhou China

The high-speed train (HST) generates strong ground vibrations when it runs on the railroad. However, little attention has been paid to retrieving surface wave from these vibrations. Here, we try to retrieve surface waves from HST-induced vibrations using field data. There are two kinds of HST tracks, one is built on the viaduct and the other is built on the ground. We acquired the signals generated by the HST running on the two kinds of tracks in Huzhou, China. In the original noise records, the HST signals can be obviously observed. In terms of a single HST event, the signals generated by the HST on the ground surface decay quickly and the signals generated by the HST running on the viaduct have broadband energy. We calculated the noise crosscorrelations in the HST-induced segments and stacked the results. Surface-wave dispersion energy were generated and compared with the results from the segments without HST. A significant improvement of the retrieval of surface waves were observed with signals generated by the HST running on viaducts while less obviously when on the ground surface. © Published under licence by IOP Publishing Ltd.

关键词： Surface waves

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EG19: Seismic interferometry from correlated sources by crosscoherence: Application to the retrieval of Rayleigh, Love and virtual refraction waves from 3C train-traffic-induced vibrations 7

EG19: Seismic interferometry from correlated sources by cros...

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7th International Conference on Engineering Geophysics, ICEG 2023

作者： Mi, Binbin Xia, Jianghai Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province School of Earth Sciences Zhejiang University Hangzhou310058 China

We extract Rayleigh, Love, and virtual refraction P waves by applying seismic interferometry to high-speed-train-induced vibrations for near-surface characterization. The sources at bridge piers with a moving train are correlated in space and time. We use crosscoherence instead of crosscorrelation to eliminate the spurious imprint of source self-correlations. Stationary-phase analysis suggests that it is easier to retrieve direct and refracted waves using a linear array along the railway with a moving train source. In the experiment, with totally 9 high-speed train events and by using stationary-phase segment selection, we extract strong multicomponent Rayleigh waves in range of 3-20 Hz. We clearly retrieve the virtual refraction P waves in range of 20-25 Hz using the in-line linear array. Love waves in range of 3-20 Hz are also observed. The extracted Rayleigh, Love and virtual refraction waves can be used to estimate S and P wave velocities of the shallow subsurface. © 2024 7th International Conference on Engineering Geophysics, ICEG 2023. All rights reserved.

关键词： Refraction

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Surface-Wave Imaging with Nonrandom Traffic Noise Sources 10

Surface-Wave Imaging with Nonrandom Traffic Noise Sources

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10th International Conference on Environmental and Engineering Geophysics, ICEEG 2023

作者： Mi, Binbin Xia, Jianghai Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province School of Earth Sciences Zhejiang University Hangzhou310058 China

We analyze the influence of nonrandom traffic noise sources on surface wave imaging. With nonrandom traffic noise sources in time (correlated sources), spurious signals are produced in the crosscorrelation functions. With nonrandom traffic noise sources in space (directional sources), phase velocities are overestimated from the retrieved surface waves. The retrieval of surface waves can be improved by stationary-phase segment selection, cross-coherence and stacking of the results from multiple traffic noise sources. Synthetic results demonstrate that cross-coherence and stacking of multiple traffic noise sources makes the source tend to be random distribution in time and suppresses the spurious signals in the crosscorrelation functions. Enhancing the stationary-phase contribution makes more accurate estimation of surface wave phase velocities. © Published under licence by IOP Publishing Ltd.

关键词： Surface waves

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Analysis of lower-boundary climate factors contributing to the summer heatwave frequency over eastern Europe using a machine-learning model

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Atmospheric and Oceanic Science Letters 2022年第5期15卷 49-54页

作者： Ruizhi Zhang Xiaojing Jia Qifeng Qian Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province School of Earth SciencesZhejiang UniversityHangzhouChina Zhejiang Institute of Meteorological Science(Chinese Academy of Meteorological Sciences Zhejiang Branch)HangzhouChina

A machine-learning(ML)model,the light gradient boosting machine(LightGBM),was constructed to simulate the variation in the summer(June-July-August)heatwave frequency(HWF)over eastern Europe(HWFUR)and to analyze the contributions of various lower-boundary climate factors to the HWFUR *** examined lower-boundary climate factors were those that may contribute to the HWFUR variation—namely,the sea surface temperature,soil moisture,snow-cover extent,and sea-ice concentration from the simultaneous summer,preceding spring,and *** selected climate factors were significantly correlated to the summer HWFUR variation and were used to construct the ML *** the hindcast simulation of HWF EUR for the period 1981-2020 and its real-time simulation for the period 2011-2020,which used the constructed ML model,were *** evaluate the contributions of the climate factors,various model experiments using different combinations of the climate factors were examined and *** results indicated that the LightGBM model had comparatively good performance in simulating the HWFUR *** sea surface temperature made more contributions to the ML model simulation than the other climate *** examination showed that the best ML simulation was that which used the climate factors in the preceding winter,suggesting that the lower-boundary conditions in the preceding winter may be critical in forecasting the summer HWFUR variation.

关键词： Heatwave frequency Eastern Europe Summer Machine learning

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