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  • 1
    Online Resource
    Online Resource
    Zurich :Trans Tech Publications, Limited,
    Keywords: Electronic books.
    Description / Table of Contents: Selected, peer reviewed papers from 9th International Workshop on Positron and Positronium Chemistry, May 11-15, 2008, Wuhan University, China.
    Type of Medium: Online Resource
    Pages: 1 online resource (287 pages)
    Edition: 1st ed.
    ISBN: 9783038132585
    Series Statement: Materials Science Forum Series ; v.Volume 607
    DDC: 541
    Language: English
    Note: Intro -- Positron and Positronium Chemistry -- Committees -- Preface -- Table of Contents -- Section 1. Fundamental Aspects of Positronium Chemistry and Symposium on Positronium Molecules -- Positronium Chemistry in Polymeric Membrane Systems -- Resonant Positron Annihilation on Molecules -- Prospects for Laser Spectroscopy of Ps2 -- Positronium Molecule Formation on Al (111)a -- Dipositronium and other Two-Positronium Compounds -- Ortho-Positronium Reemission Yield and Energy in Surfactant-Templated Mesoporous Silica Films -- Collisions Involving Positrons and Positronium -- Positronium Thermalization Process in Nanoporous Materials and its Influence on the Shape of PALS Spectrum -- S-Wave Resonances in Positron Scattering from Li and Na -- Positronium in Alkanes at High Pressure of Argon and Nitrogen -- Section 2. Polymer and Insulator -- A Phenomenological Description of the PALS Response in Glass - Forming Systems -- Momentum Distributions of Ortho-Positronium Dependent on Electronic State at Free Volume Walls in Insulators -- Free Volume and Oxygen Permeability in Polymers Related to Polymer Electrolyte Fuel Cells -- Effect of Oxygen on the Free Volume Property of Poly (Ether-Urethane) Irradiated by Neutron -- Seeking the Good Fitting Procedure of PALS Polymer Spectra -- Studying Polyamide Water Separation Film Using Slow Positron Beam -- Positron Annihilation Lifetime Study of Graft-Type Fluorinated Polymer Electrolyte Membranes -- Analysis of Radiation Induced Phenomena in a Polymer Electrolyte Membrane with Positron Annihilation Technique -- The Interface of Multi-Phase Polymer Systems Studied by Positron Annihilation -- The Effect of Anneal on PP and PA Blends Studied by Positron -- Investigation of Free Volume in Epoxy Resins Studied by PALS -- Positron Annihilation and Chemistry of Groups in Hyperbranched Polymers. , The Influence of Acrylic Acid Groups on the Microstructure of HDPE/PS/Clay System Studied by Positron Annihilation -- Influence of Free Volume on Damping Properties for CIIR and CIIR/PEA Investigated by Positron -- Section 3. Surface and Interface, Non-Metallic Solids -- Atomic Scale Study of Surface Structures and Phase Transitions with Reflection High-Energy Positron Diffraction -- Positron Beam Characterization of Silica Thin Films with Structurally Ordered Porosity -- Positron Beam Study of Co Doped ZnO Films Prepared by PLD -- Positron Implantation and Transmission Experiments on Free-Standing Nanometric Polymer Films -- Slow Positron Beam Probe for the ZnO/Silicone under Proton Irradiation -- Hydrogen- and Corrosion-Related Defect Characterization of Iron and Steels Using a Slow Positron Beam -- Disordered Structures of Adsorbed Hydrogens on Ni(111) Surface Studied by Slow Positron Beam and LEED -- Vacancy-Hydrogen Complexes in ZnO -- Positron Lifetime Study on Degradation of TiCrV Hydrogen Storage Alloy -- Structure and Positron Characteristics of Basic Open Volume Defects in Zirconia -- Luminescence and Defect Study of Ce3+-Doped Lu3Al5O12 Phosphors -- The Behavior of Oxygen and Defects in Si-Based Semiconductor Studied by Positron Annihilation Techniques -- Study of Compensation Defects and Electron Irradiation-Induced Defects in Undoped SI-InP by Positron Lifetime Spectroscopy -- Characterizing Native Point Defects in ZnO Bulk by Positron Annihilation Spectroscopy -- Defects in Electron Irradiation Te-Doped GaSb Studied by Positron Lifetime Spectroscopy -- Defect Study of As-Grown Single Crystal ZnO by Positron -- The Calculation of Positron Lifetime in Ni3Al Alloy -- Defects in Carbon Allotropes Studied by Positron Annihilation -- Positron Annihilation on the Surfaces of Single Crystals of Si, SiO2, Graphite and Cu. , Section 4. Porous Materials and Nanostructures -- Some Problems of the Free Volume Studies in Porous Polymers Using Positron Annihilation and Auxiliary Techniques -- Spontaneous Emission of Positronium Negative Ions from Tungsten (100) Surface -- Temperature and Pressure Measurements of PALS Spectra in Photonic Glasses -- Positron Lifetime Spectroscopy on Controlled Pore Glass Porosimetry and Pore Size Distribution -- Monitoring the Crystallization Stages of Silicalite by Positron Lifetime Spectroscopy -- Free Volumes in Polymer Nanocomposites -- n-Nonadecane Embedded in Mesopores -- Investigation of Interfacial Interaction and Microstructure for Epoxy/CNTs Nanocomposites by PALS -- Positron Study of Carbon Black Parameters: Structure and Surface Area -- Open-Nano Pores in Natural Minerals Studied by Positron Lifetime Spectroscopy -- Study of the Defect Formation of Helium in Nanocrystalline Titanium Films -- Tungsten Oxide Nanostructures Growth in HFCVD System by Slow Positron Beam -- Positron Annihilation in Carbon Nanotubes -- Formation of Ordered Pores Determined by Positronium Time of Flight Spectroscopy -- Influence of Sintering Temperature on Defects in Porous Silica Monoliths Studied by Positron Annihilation Techniques -- Porous Structure of Mesoporous Silica Studied by Positron Annihilation Lifetime Spectroscopy -- Temperature Dependence of Free Volume in Epoxy/Rectorite Nanocomposites by Positron Annihilation -- Section 5. Liquids and Bio-Application -- Influence of Temperature on Intratrack Processes and Ps Formation and Behaviour in Liquid Water -- Freezing of Nanodroplets: Phase Transition of Organic Liquids Confined in Nanopores Studied by Positron Annihilation Spectroscopy -- Positron Method for Diagnostics of Carcinogens -- Hydrogen Bonded Supra Molecular Structure as Studied by Positron Annihilation Spectroscopy. , Positronium Formation in Room Temperature Ionic Liquids -- Free Volume Seen by Positronium in Bulk and Confined Molecular Liquid -- Section 6. Advances in Experimental Methods -- Development of Positron Microbeam in AIST -- Development of the Positron Facility at the Argonne National Laboratory's 20 MeV Linac -- Interlaboratory Comparison of Positron Annihilation Lifetime Measurements -- Optimization of Positron Lifetime Spectrometer Using Monte-Carlo Simulation of the Detectors -- 4-Channel Digital Positron Lifetime Spectrometer for Studying Biological Samples -- Advanced Algorithms for PALS Analysis of Self-Assembled Amphiphiles -- A Novel Approach to the Interpretation of PAL Spectra in Glycerol -- Guiding of a Slow Positron Beam with a Glass Capillary -- Application of Positron Microprobe for Nuclear Materials -- Keywords Index -- Authors Index.
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  • 2
    Online Resource
    Online Resource
    Newark :American Geophysical Union,
    Keywords: Climatic changes. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (435 pages)
    Edition: 1st ed.
    ISBN: 9781119068044
    Series Statement: Geophysical Monograph Series ; v.226
    DDC: 551.5
    Language: English
    Note: Intro -- TITLE PAGE -- COPYRIGHT PAGE -- CONTENTS -- CONTRIBUTORS -- PREFACE -- ACKNOWLEDGMENTS -- PART I FORCINGS OF CLIMATE EXTREMES -- CHAPTER 1 THE CHANGING EL NIÑO-SOUTHERN OSCILLATION AND ASSOCIATED CLIMATE EXTREMES -- 1.1. INTRODUCTION -- 1.2. CHANGES IN ENSO PROPERTIES -- 1.3. CHANGES IN ENSO DYNAMICS -- 1.4. CHANGES IN ENSO TELECONNECTIONS AND ASSOCIATED CLIMATE EXTREMES -- 1.5. ENSO IN THE FUTURE -- 1.6. SUMMARY -- ACKNOWLEDGMENTS -- REFERENCES -- CHAPTER 2 WEATHER EXTREMES LINKED TO INTERACTION OF THE ARCTIC AND MIDLATITUDES -- 2.1. INTRODUCTION -- 2.2. ARCTIC EFFECTS ON MIDLATITUDE EXTREMES -- 2.3. MIDLATITUDE EFFECTS ON ARCTIC EXTREMES -- 2.4. DISCUSSION AND CONCLUSIONS -- ACKNOWLEDGMENTS -- REFERENCES -- CHAPTER 3 IMPACT OF AEROSOLS ON REGIONAL CHANGES IN CLIMATE EXTREMES -- 3.1. INTRODUCTION -- 3.2. DIRECT AND INDIRECT EFFECTS OF AEROSOLS ON CLOUDS AND RADIATION -- 3.3. AEROSOL IMPACT ON REGIONAL CLIMATE CHANGE -- 3.4. Mitigation scenarios for aerosol emissions -- 3.5. AEROSOL EFFECT ON TEMPERATURE AND PRECIPITATION EXTREMES -- 3.6. FUTURE RESEARCH NEEDS -- ACKNOWLEDGMENTS -- REFERENCES -- CHAPTER 4 WEAKENED FLOW, PERSISTENT CIRCULATION, AND PROLONGED WEATHER EXTREMES IN BOREAL SUMMER -- 4.1. INTRODUCTION -- 4.2. RESONANT CIRCULATION REGIMES -- 4.3. REAL EVENTS -- 4.4. CONCLUSIONS AND DISCUSSIONS -- ACKNOWLEDGMENTS -- REFERENCES -- CHAPTER 5 LAND PROCESSES AS THE FORCING OF EXTREMES: A REVIEW -- 5.1. INTRODUCTION -- 5.2. FORCINGS OF LAND PROCESSES ON CLIMATE EXTREMES -- 5.3. SUMMARY -- ACKNOWLEDGMENTS -- REFERENCES -- PART II PROCESSES OF CLIMATE EXTREMES -- CHAPTER 6 TIMING OF ANTHROPOGENIC EMERGENCE IN CLIMATE EXTREMES -- 6.1. INTRODUCTION -- 6.2. DEFINING TIME OF EMERGENCE -- 6.3. DATA AND METHODS -- 6.4. RESULTS -- 6.5. DISCUSSION -- 6.6. CONCLUSIONS -- ACKNOWLEDGMENTS -- REFERENCES. , CHAPTER 7 RECENT INCREASES IN EXTREME TEMPERATURE OCCURRENCE OVER LAND -- 7.1. INTRODUCTION -- 7.2. DATA AND METHODOLOGY -- 7.3. RESULTS -- 7.4. CONCLUSIONS -- REFERENCES -- CHAPTER 8 WHY FUTURE SHIFTS IN TROPICAL PRECIPITATION WILL LIKELY BE SMALL: THE LOCATION OF THE TROPICAL RAIN BELT AND THE HEMISPHERIC CONTRAST OF ENERGY INPUT TO THE ATMOSPHERE -- 8.1. INTRODUCTION -- 8.2. THE RELATIONSHIP BETWEEN ITCZ POSITION AND HEMISPHERIC CONTRAST OF ATMOSPHERIC HEATING -- 8.3. RELATIONSHIP BETWEEN THE SEASONAL CYCLE OF ITCZ MIGRATION AND THE ANNUAL MEAN PRECIPITATION DISTRIBUTION -- 8.4. IMPLICATIONS FOR FUTURE ITCZ SHIFTS UNDER GLOBAL WARMING -- REFERENCES -- CHAPTER 9 WEATHER-CLIMATE INTERACTIONS AND MJO INFLUENCES -- 9.1. INTRODUCTION -- 9.2. THE INTERACTIONS BETWEEN THE MJO, BACKGROUND STATE, AND SYNOPTIC WEATHER -- 9.3. A CASE STUDY ON INTERACTIONS BETWEEN THE MADDEN-JULIAN OSCILLATION AND EL NIÑO -- 9.4. INTERACTIONS BETWEEN THE MJO AND BREAKING WAVES -- 9.5. INTERACTIONS BETWEEN THE MJO, TROPICAL CYCLONES, AND THE EXTRATROPICAL CIRCULATION -- 9.6. SUMMARY -- REFERENCES -- CHAPTER 10 RECENT CLIMATE EXTREMES ASSOCIATED WITH THE WEST PACIFIC WARMING MODE -- 10.1. INTRODUCTION -- 10.2. BACKGROUND -- 10.3. DATA AND METHODS -- 10.4. SUMMARY AND DISCUSSION -- REFERENCES -- CHAPTER 11 CONNECTIONS BETWEEN HEAT WAVES AND CIRCUMGLOBAL TELECONNECTION PATTERNS IN THE NORTHERN HEMISPHERE SUMMER -- 11.1. INTRODUCTION -- 11.2. DATA AND METHODS -- 11.3. DISTRIBUTION OF HEAT WAVES -- 11.4. PLANETARY WAVES ASSOCIATED WITH THE HEAT WAVES -- 11.5. SUMMARY AND DISCUSSION -- ACKNOWLEDGMENTS -- REFERENCES -- PART III REGIONAL CLIMATE EXTREMES -- CHAPTER 12 NORTH AMERICAN DROUGHT AND LINKS TO NORTHERN EURASIA: THE ROLE OF STATIONARY ROSSBY WAVES -- 12.1. INTRODUCTION -- 12.2. REANALYSIS DATA AND THE GEOS-5 AGCM EXPERIMENTS -- 12.3. RESULTS -- 12.4. SUMMARY AND CONCLUSIONS. , ACKNOWLEDGMENTS -- REFERENCES -- CHAPTER 13 THE CALIFORNIA DROUGHT: TRENDS AND IMPACTS -- 13.1. INTRODUCTION -- 13.2. THE PROLONGED DROUGHT OF 2012-2016 -- 13.3. ROLE OF ENSO CYCLE -- 13.4. ARCTIC INFLUENCES -- 13.5. DROUGHT IMPACTS ON CALIFORNIA -- 13.6. CONCLUDING REMARKS -- REFERENCES -- CHAPTER 14 OBSERVED TRENDS IN US TORNADO FREQUENCY -- 14.1. INTRODUCTION -- 14.2. STORM DATA TORNADO DATABASE -- 14.3. US TORNADO CLIMATOLOGY -- 14.4. CHANGES IN US TORNADO STATISTICS -- 14.5. CONCLUDING REMARKS -- ACKNOWLEDGMENTS -- REFERENCES -- CHAPTER 15 MECHANISMS EXPLAINING RECENT CHANGES IN AUSTRALIAN CLIMATE EXTREMES -- 15.1. INTRODUCTION -- 15.2. AUSTRALIAN RAINFALL EXTREMES OF 2010-2012 -- 15.3. AUSTRALIA'S TEMPERATURE EXTREMES OF 2013 -- 15.4. SUMMARY AND CONCLUSIONS -- ACKNOWLEDGMENTS -- REFERENCES -- CHAPTER 16 UNRAVELING EAST AFRICA'S CLIMATE PARADOX -- 16.1. INTRODUCTION -- 16.2. THE NATURE OF THE RECENT EAST AFRICAN LONG RAINS DECLINE -- 16.3. LINKS TO PACIFIC DECADAL VARIABILITY -- 16.4. PHYSICAL CONSIDERATIONS -- 16.5. CLIMATE MODEL SIMULATIONS OF EAST AFRICAN CLIMATE -- 16.6. CONCLUSIONS -- ACKNOWLEDGMENTS -- REFERENCES -- CHAPTER 17 A PHYSICAL MODEL FOR EXTREME DROUGHT OVER SOUTHWEST ASIA -- 17.1. INTRODUCTION -- 17.2. PRECIPITATION PATTERNS -- 17.3. SST RELATIONSHIPS -- 17.4. ATMOSPHERIC TELECONNECTIONS -- 17.5. SUMMARY -- APPENDIX: DATA -- REFERENCES -- PART IV PREDICTION OF CLIMATE EXTREMES -- CHAPTER 18 EXTRATROPICAL PRECURSORS OF THE EL NIÑO-SOUTHERN OSCILLATION -- 18.1. INTRODUCTION -- 18.2. OVERVIEW OF PRECURSORS AND THEIR IMPACT ON ENSO -- 18.3. DATA AND DEFINITIONS -- 18.4. EVALUATION OF PRECURSOR VARIABILITY AND COVARIABILITY -- 18.5. RELATIONSHIP BETWEEN PRECURSORS AND ENSO -- 18.6. DIAGNOSING PRECURSORS AS ENSO PREDICTORS -- 18.7. RELATIONSHIP OF EXTRATROPICAL PRECURSORS TO 2014 AND 2015 EL NIñO -- 18.8. SUMMARY AND DISCUSSION. , REFERENCES -- CHAPTER 19 NORTH ATLANTIC SEASONAL HURRICANE PREDICTION: UNDERLYING SCIENCE AND AN EVALUATION OF STATISTICAL MODELS -- 19.1. INTRODUCTION -- 19.2. STATISTICALLY BASED SEASONAL HURRICANE OUTLOOK MODELS -- 19.3. CONCLUSIONS -- REFERENCES -- CHAPTER 20 PREDICTING SUBSEASONAL PRECIPITATION VARIATIONS BASED ON THE MADDEN-JULIAN OSCILLATION -- 20.1. INTRODUCTION -- 20.2. THE MJO INFLUENCE ON THE VARIABILITY OF PRECIPITATION -- 20.3. FORECASTING THE MJO -- 20.4. THE MJO AND PREDICTABILITY OF PRECIPITATION -- 20.5. CONCLUSIONS -- ACKNOWLEDGMENTS -- REFERENCES -- CHAPTER 21 PREDICTION OF SHORT-TERM CLIMATE EXTREMES WITH A MULTIMODEL ENSEMBLE -- 21.1. INTRODUCTION -- 21.2. PREDICTION SKILL -- 21.3. PREDICTABILITY -- 21.4. SUMMARY AND DISCUSSION -- REFERENCES -- CHAPTER 22 TOWARD PREDICTING US TORNADOES IN THE LATE 21ST CENTURY -- 22.1. PROJECTING CHANGES IN US TORNADO ACTIVITY USING ENVIRONMENTAL PROXIES -- 22.2. SHORT-TERM TORNADO PREDICTION USING HIGH RESOLUTION MODELS AND APPLICATIONS TO DYNAMICAL DOWNSCALING -- 22.3. CONCLUDING REMARKS -- ACKNOWLEDGMENTS -- REFERENCES -- INDEX -- SUPPLEMENTAL IMAGES -- EULA.
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  • 3
    Publication Date: 2020-02-12
    Description: The formation and evolution of permafrost in China during the last 20 ka were reconstructed on the basis of large amount of paleo-permafrost remains and paleo-periglacial evidence, as well as paleo-glacial landforms, paleo-flora and paleofauna records. The results indicate that, during the local Last Glacial Maximum (LLGM) or local Last Permafrost Maximum (LLPMax), the extent of permafrost of China reached 5.3×106−5.4×106 km2, or thrice that of today, but permafrost shrank to only 0.80×106−0.85×106 km2, or 50% that of present, during the local Holocene Megathermal Period (LHMP), or the local Last Permafrost Minimum (LLPMin). On the basis of the dating of periglacial remains and their distributive features, the extent of permafrost in China was delineated for the two periods of LLGM (LLPMax) and LHMP (LLPMin), and the evolution of permafrost in China was divided into seven periods as follows: (1) LLGM in Late Pleistocene (ca. 20000 to 13000−10800 a BP) with extensive evidence for the presence of intensive ice-wedge expansion for outlining its LLPMax extent; (2) A period of dramatically changing climate during the early Holocene (10800 to 8500−7000 a BP) when permafrost remained relatively stable but with a general trend of shrinking areal extent; (3) The LHMP in the Mid-Holocene (8500−7000 to 4000−3000 a BP) when permafrost degraded intensively and extensively, and shrank to the LLPMin; (4) Neoglaciation during the late Holocene (4000−3000 to 1000 a BP, when permafrost again expanded; (5) Medieval Warming Period (MWP) in the late Holocene (1000−500 a BP) when permafrost was in a relative decline; (6) Little Ice Age (LIA) in the late Holocene (500−100 a BP), when permafrost relatively expanded, and; (7) Recent warming (during the 20th century), when permafrost continuously degraded and still is degrading. The paleo-climate, geography and paleopermafrost extents and other features were reconstructed for each of these seven periods.
    Language: English
    Type: info:eu-repo/semantics/article
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  • 4
    Publication Date: 2020-11-03
    Description: In this study, Sentinel-1 and Advanced Land Observation Satellite-2 (ALOS-2) interferometric synthetic aperture radar (InSAR) and global positioning system (GPS) data were used to jointly determine the source parameters and fault slip distribution of the Mw 6.6 Hokkaido eastern Iburi, Japan, earthquake that occurred on 5 September 2018. The coseismic deformation map obtained from the ascending and descending Sentinel-1 and ALOS-2 InSAR data and GPS data is consistent with a thrust faulting event. A comparison between the InSAR-observed and GPS-projected line-of-sight (LOS) deformation suggests that descending Sentinel-1 track T046D, descending ALOS-2 track P018D, and ascending ALOS-2 track P112A and GPS data can be used to invert for the source parameters. The results of a nonlinear inversion show that the seismogenic fault is a blind NNW-trending (strike angle ~347.2°), east-dipping (dip angle ~79.6°) thrust fault. On the basis of the optimal fault geometry model, the fault slip distribution jointly inverted from the three datasets reveals that a significant slip area extends 30 km along the strike and 25 km in the downdip direction, and the peak slip magnitude can approach 0.53 m at a depth of 15.5 km. The estimated geodetic moment magnitude released by the distributed slip model is 6.16 ×1018 N⋅m , equivalent to an event magnitude of Mw 6.50, which is slightly smaller than the estimates of focal mechanism solutions. According to the Coulomb stress change at the surrounding faults, more attention should be paid to potential earthquake disasters in this region in the near future. In consideration of the possibility of multi-fault rupture and complexity of regional geologic framework, the refined distributed slip and seismogenic mechanism of this deep reverse faulting should be investigated with multi-disciplinary (e.g., geodetic, seismic, and geological) data in further studies.
    Language: English
    Type: info:eu-repo/semantics/article
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  • 5
    Publication Date: 2020-12-10
    Description: Satellite sun-induced chlorophyll fluorescence (SIF) has emerged as a promising tool for monitoring growing conditions and productivity of vegetation. However, it still remains unclear the ability of satellite SIF data to predict crop yields at the regional scale, comparing to widely used satellite vegetation index (VI), such as the Enhanced Vegetation Index (EVI) from the Moderate Resolution Imaging Spectroradiometer (MODIS). Additionally, few attempts have been made to verify if SIF products from the new Orbiting Carbon Observatory-2 (OCO-2) satellite could be applied for regional corn and soybean yield estimates. With the deep neural networks (DNN) approach, this study investigated the ability of OCO-2 SIF, MODIS EVI, and climate data to estimate county-level corn and soybean yields in the U.S. Corn Belt. Monthly mean and maximum SIF and MODIS EVI during the peak growing season showed similar correlations with corn and soybean yields. The DNNs with SIF as predictors were able to estimate corn and soybean yields well but performed poorer than MODIS EVI and climate variables-based DNNs. The performance of SIF and MODIS EVI-based DNNs varied with the areal dominance of crops while that of climate-based DNNs exhibited less spatial variability. SIF data could provide useful supplementary information to MODIS EVI and climatic variables for improving estimates of crop yields. MODIS EVI and climate predictors (e.g., VPD and temperature) during the peak growing season (from June to August) played important roles in predicting yields of corn and soybean in the Midwestern 12 states in the U.S. The results highlighted the benefit of combining data from both satellite and climate sources in crop yield estimation. Additionally, this study showed the potential of adding SIF in crop yield prediction despite the small improvement of model performances, which might result from the limitation of current available SIF products. The framework of this study could be applied to different regions and other types of crops to employ deep learning for crop yield forecasting by combining different types of remote sensing data (such as OCO-2 SIF and MODIS EVI) and climate data.
    Language: English
    Type: info:eu-repo/semantics/article
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  • 6
    Publication Date: 2020-12-14
    Description: In precise point positioning (PPP) applications, uncalibrated phase delays (UPD) are applied to retrieve the ambiguity integers for achieving precise solutions over a short period. Also, the atmospheric corrections obtained from a dense reference network are applied to accomplish this task of shorter convergence time or even instantaneous ambiguity resolution. The combined BeiDou Navigation Satellite System (BDS) and Global Positioning System (GPS) PPP with regional network augmentation is presented with threefold contributions. First, in order to overcome the UPD-inherent unmodeled errors in undifferenced ambiguity resolution at reference stations, it is proposed to fix the single-differenced ambiguities and use them as a constraint to fix the undifferenced ambiguities. Second, the performance of combined GPS+BDS PPP are fully evaluated with various indicators specified by single and combined satellite systems and several ratio test thresholds for ambiguity resolution. The BDS observations can provide the user with a significant improvement on the position solutions. The fix rate and correct fix rate are found to be increased by more than 7% and 11%, respectively. Third, the GPS+BDS regional augmented PPP is assessed in a highly occluded urban canyon. The experiments show the unfix rates of the combined system are decreased by more than 40%, and the correct fix rates can be improved by up to 55% compared with a GPS-only scenario.
    Language: English
    Type: info:eu-repo/semantics/article
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  • 7
    Publication Date: 2021-03-16
    Description: The modern high topography of the Tianshan resulted from the reactivation of a Paleozoic orogenic belt by the India/Asia collision. Today, the range exhibits tectonically active forelands and intermontane basins. Based on quantitative morphotectonic observations and age constraints derived from cosmogenic 10Be dating, single-grain post-infrared infrared stimulated luminescence (p-IR IRSL) dating and modeling of fault scarp degradation, we quantify the deformation in the Nalati and Bayanbulak intermontane basins in the central Eastern Tianshan. Our results indicate that at least 1.4 mm/yr of horizontal crustal shortening is accommodated within these two basins. This shortening represents over 15% of the 8.5 ± 0.5 mm/yr total shortening rate across the entire range at this longitude. This shortening rate implies that the Eastern Central Tianshan is thickening at a mean rate of ∼1.4 mm/yr, a rate that is significantly higher than the average denudation rate of 0.14 mm/yr derived from our cosmogenic analysis. This discrepancy suggests that the Tianshan range has not yet reached a steady-state topography and remains in a transient state of topographic growth, most likely due to limited denudation rates driven by the arid climate of Central Asia.
    Language: English
    Type: info:eu-repo/semantics/article
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  • 8
    Publication Date: 2021-04-01
    Description: The conjugate measurements of a detached SAR arc on 28 March 2017 are analyzed using observations from the Arase satellite. Swarm and GNSS‐TEC data show that the electron density decreased and the electron temperature increased in the ionosphere above the SAR arc. The observed plasmas and electromagnetic fields suggest that Coulomb collision is the most plausible mechanism for the SAR‐arc generation.
    Language: English
    Type: info:eu-repo/semantics/article
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  • 9
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    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Publication Date: 2023-05-19
    Description: Recent expansion of the Hadley circulation, Earth’s major atmospheric meridional overturning circulation, is linked to anthropogenic emissions and variability within the climate system. Most studies of this expansion focus on a poleward shift in the Hadley circulation’s dry, descending limb over subtropical arid zones. Instead, we target the tropical rain belt, the latitudinal band spanned by the seasonal migration of the Intertropical Convergence Zone that represents the near-equatorial wet, ascending limb. Here we examine drivers of changes in the width (expansion and contraction) of the Indo-Pacific tropical rain belt since CE 850 by coupling highly resolved stalagmites, tree rings, corals, and marine sediments with state-of-the-art climate model simulations. We identify strong modulation of Indo-Pacific tropical rain belt width by persistent internal variability within the climate system, as seen in characteristic basin-wide changes in ocean temperatures and the atmospheric circulation at multi-decadal time scales associated with the Pacific’s leading mode of decadal variability, the Interdecadal Pacific Oscillation. Our analyses define an envelope of tropical rain belt variability from terrestrial and marine proxies that provides a long-term context to the short, regional instrumental record. These results hold important implications for decadal predictions and climate risk management over societally-relevant time scales.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 10
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    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Publication Date: 2023-06-29
    Description: An Ms6.9 earthquake occurred in Menyuan, Qinghai, China on Jan 7th, 2022. This earthquake destructed the high-speed railway passing through the epicentral area and rise concerns on the seismic hazard of the Tianzhu Seismic gap, which is about 150 km long. Two DAS arrays were deployed with about 40km long dark fiber optic cable for aftershock monitoring and subsurface imaging. Three automatic methods were utilized to scan earthquake signals on the continuous data including: a neural network, template-matching method, and a hybrid method integrating array-detection and template-matching. All of three methods reported more than 80% aftershocks in the routine catalog and up to 50% newly detected events. For the template-matching method, using aftershocks occurred in the first two-day as templates provides about 91% catalog events and 50% additional events. The other two methods do not depend on the prior information, which means quicker response. The fault-related signal is also observed on the seismic wavefields of earthquakes, which helps to identify blind faults in the Menyuan basin. Ambient noise tomography method was used to construct 2D Vs profile along one cable. Strong lateral variation emerges and faults can be identified on the NCF COG gather. Such high-resolution shallow structure model and earthquake catalog provides additional information of seismic hazard in the Menyuan region.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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