Acta Geophysica最新文献_第6页

Modelling and Observation of Mineral Dust Optical Properties over Central Europe 中欧地区矿物粉尘光学特性的模拟和观测

IF 2.3 4区地球科学

Acta Geophysica Pub Date : 2016-12-28 DOI: 10.1515/acgeo-2016-0069

M. Chilinski, K. Markowicz, Olga Zawadzka, I. Stachlewska, Wojciech Kumala, T. Petelski, P. Makuch, D. Westphal, Bogdan Zagajewski

{"title":"Modelling and Observation of Mineral Dust Optical Properties over Central Europe","authors":"M. Chilinski, K. Markowicz, Olga Zawadzka, I. Stachlewska, Wojciech Kumala, T. Petelski, P. Makuch, D. Westphal, Bogdan Zagajewski","doi":"10.1515/acgeo-2016-0069","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0069","url":null,"abstract":"This paper is focused on Saharan dust transport to Central Europe/Poland; we compare properties of atmospheric Saharan dust using data from NAAPS, MACC, AERONET as well as observations obtained during HyMountEcos campaign in June 2012. Ten years of dust climatology shows that long-range transport of Saharan dust to Central Europe is mostly during spring and summer. HYSPLIT back-trajectories indicate airmass transport mainly in November, but it does not agree with modeled maxima of dust optical depth. NAAPS model shows maximum of dust optical depth (~0.04–0.05, 550 nm) in April–May, but the MACC modeled peak is broader (~0.04). During occurrence of mineral dust over Central-Europe for 14% (NAAPS) / 12% (MACC) of days dust optical depths are above 0.05 and during 4% (NAAPS) / 2.5% (MACC) of days dust optical depths exceed 0.1. The HyMountEcos campaign took place in June–July 2012 in the mountainous region of Karkonosze. The analysis includes remote sensing data from lidars, sunphotometers, and numerical simulations from NAAPS, MACC, DREAM8b models. Comparison of simulations with observations demonstrates the ability of models to reasonably reproduce aerosol vertical distributions and their temporal variability. However, significant differences between simulated and measured AODs were found. The best agreement was achieved for MACC model.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0069","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67090953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

First Measurements of the Earth’s Electric Field at the Arctowski Antarctic Station, King George Island, by the New Polish Atmospheric Electricity Observation Network 新波兰大气电观测网在乔治国王岛的阿尔托斯基南极站首次测量地球电场

IF 2.3 4区地球科学

Acta Geophysica Pub Date : 2016-12-28 DOI: 10.1515/acgeo-2016-0096

M. Kubicki, A. Odzimek, M. Neska, J. Berliński, S. Michnowski

{"title":"First Measurements of the Earth’s Electric Field at the Arctowski Antarctic Station, King George Island, by the New Polish Atmospheric Electricity Observation Network","authors":"M. Kubicki, A. Odzimek, M. Neska, J. Berliński, S. Michnowski","doi":"10.1515/acgeo-2016-0096","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0096","url":null,"abstract":"Atmospheric electricity measurements are performed all over the globe for getting a better understanding of the processes and phenomena operating in the Earth’s electric atmosphere, ionosphere and magnetosphere. Over recent years, we have established coordinated observations of atmospheric electricity, mainly of the vertical component of the Earth’s atmospheric electric field, from Polish observation stations: Stanisław Kalinowski Geophysical Observatory in Świder, Poland, Stanisław Siedlecki Polar Station in Hornsund, Svalbard, Norway, and, for the first time, the Henryk Arctowski Antarctic Station in King George Island. The organisation of this network is presented here as well as a preliminary summary of geophysical conditions at Arctowski, important from the point of view of atmospheric electricity observations. In particular, we refer to the geomagnetic observations made at Arctowski station in 1978–1995. We also present the average fair-weather diurnal variation of the atmospheric electric field based on observations made so far between 2013 and 2015.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0096","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67091717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Crustal Structure Along Sunda-Banda Arc Transition Zone from Teleseismic Receiver Functions 从远震接收函数看巽他-班达弧过渡带的地壳结构

IF 2.3 4区地球科学

Acta Geophysica Pub Date : 2016-12-28 DOI: 10.1515/acgeo-2015-0098

S. Syuhada, N. Hananto, C. I. Abdullah, N. Puspito, T. Anggono, T. Yudistira

引用次数: 24

Acoustic Emission Parameters of Three Gorges Sandstone during Shear Failure 三峡砂岩剪切破坏过程中的声发射参数

IF 2.3 4区地球科学

Acta Geophysica Pub Date : 2016-12-28 DOI: 10.1515/acgeo-2016-0094

Jiang Xu, Yixin Liu, S. Peng

{"title":"Acoustic Emission Parameters of Three Gorges Sandstone during Shear Failure","authors":"Jiang Xu, Yixin Liu, S. Peng","doi":"10.1515/acgeo-2016-0094","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0094","url":null,"abstract":"In this paper, an experimental investigation of sandstone samples from the Three Gorges during shear failure was conducted using acoustic emission (AE) and direct shear tests. The AE count rate, cumulative AE count, AE energy, and amplitude of the sandstone samples were determined. Then, the relationships among the AE signals and shearing behaviors of the samples were analyzed in order to detect micro-crack initiation and propagation and reflect shear failure. The results indicated that both the shear strength and displacement exhibited a logarithmic relationship with the displacement rate at peak levels of stress. In addition, the various characteristics of the AE signals were apparent in various situations. The AE signals corresponded with the shear stress under different displacement rates. As the displacement rate increased, the amount of accumulative damage to each specimen decreased, while the AE energy peaked earlier and more significantly. The cumulative AE count primarily increased during the post-peak period. Furthermore, the AE count rate and amplitude exhibited two peaks during the peak shear stress period due to crack coalescence and rock bridge breakage. These isolated cracks later formed larger fractures and eventually caused ruptures.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0094","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67091692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

The New Algorithm for Fast Probabilistic Hypocenter Locations 地震快速概率定位新算法

IF 2.3 4区地球科学

Acta Geophysica Pub Date : 2016-12-28 DOI: 10.1515/acgeo-2016-0111

W. Debski, P. Klejment

引用次数: 4

Potential Field, Geoelectrical and Reflection Seismic Investigations for Massive Sulphide Exploration in the Skellefte Mining District, Northern Sweden 瑞典北部Skellefte矿区块状硫化物勘探的位场、地电和反射地震调查

IF 2.3 4区地球科学

Acta Geophysica Pub Date : 2016-12-28 DOI: 10.1515/acgeo-2016-0088

S. Tavakoli, Mahdieh Dehghannejad, María Ángeles García Juanatey, Tobias E. Bauer, P. Weihed, S. Elming

{"title":"Potential Field, Geoelectrical and Reflection Seismic Investigations for Massive Sulphide Exploration in the Skellefte Mining District, Northern Sweden","authors":"S. Tavakoli, Mahdieh Dehghannejad, María Ángeles García Juanatey, Tobias E. Bauer, P. Weihed, S. Elming","doi":"10.1515/acgeo-2016-0088","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0088","url":null,"abstract":"Multi-scale geophysical studies were conducted in the central Skellefte district (CSD) in order to delineate the geometry of the upper crust (down to maximum ∼ 4.5 km depth) for prospecting volcanic massive sulphide (VMS) mineralization. These geophysical investigations include potential field, resistivity/induced polarization (IP), reflection seismic and magnetotelluric (MT) data which were collected between 2009 and 2010. The interpretations were divided in two scales: (i) shallow (∼ 1.5 km) and (ii) deep (∼4.5 km). Physical properties of the rocks, including density, magnetic susceptibility, resistivity and chargeability, were also used to improve interpretations. The study result delineates the geometry of the upper crust in the CSD and new models were suggested based on new and joint geophysical interpretation which can benefit VMS prospecting in the area. The result also indicates that a strongly conductive zone detected by resistivity/IP data may have been missed using other geophysical data.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0088","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67091568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Imprints of Natural Phenomena and Human Activity Observed During 10 Years of ELF Magnetic Measurements at the Hylaty Geophysical Station in Poland 波兰Hylaty地球物理站10年极低频磁测量观测到的自然现象和人类活动的印记

IF 2.3 4区地球科学

Acta Geophysica Pub Date : 2016-12-28 DOI: 10.1515/acgeo-2016-0101

Z. Nieckarz

引用次数: 1

Various Approaches to Forward and Inverse Wide-Angle Seismic Modelling Tested on Data from DOBRE-4 Experiment 基于DOBRE-4试验数据的多种广角地震正反演模拟方法

IF 2.3 4区地球科学

Acta Geophysica Pub Date : 2016-12-28 DOI: 10.1515/acgeo-2016-0084

T. Janik, P. Środa, W. Czuba, D. Lysynchuk

{"title":"Various Approaches to Forward and Inverse Wide-Angle Seismic Modelling Tested on Data from DOBRE-4 Experiment","authors":"T. Janik, P. Środa, W. Czuba, D. Lysynchuk","doi":"10.1515/acgeo-2016-0084","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0084","url":null,"abstract":"The interpretation of seismic refraction and wide angle reflection data usually involves the creation of a velocity model based on an inverse or forward modelling of the travel times of crustal and mantle phases using the ray theory approach. The modelling codes differ in terms of model parameterization, data used for modelling, regularization of the result, etc. It is helpful to know the capabilities, advantages and limitations of the code used compared to others.This work compares some popular 2D seismic modelling codes using the dataset collected along the seismic wide-angle profile DOBRE-4, where quite peculiar/uncommon reflected phases were observed in the wavefield.The ~505 km long profile was realized in southern Ukraine in 2009, using 13 shot points and 230 recording stations. Double PMP phases with a different reduced time (7.5–11 s) and a different apparent velocity, intersecting each other, are observed in the seismic wavefield. This is the most striking feature of the data. They are interpreted as reflections from strongly dipping Moho segments with an opposite dip. Two steps were used for the modelling. In the previous work by Starostenko et al. (2013), the trial-and-error forward model based on refracted and reflected phases (SEIS83 code) was published. The interesting feature is the high-amplitude (8–17 km) variability of the Moho depth in the form of downward and upward bends. This model is compared with results from other seismic inversion methods: the first arrivals tomography package FAST based on first arrivals; the JIVE3D code, which can also use later refracted arrivals and reflections; and the forward and inversion code RAYINVR using both refracted and reflected phases. Modelling with all the codes tested showed substantial variability of the Moho depth along the DOBRE-4 profile. However, SEIS83 and RAYINVR packages seem to give the most coincident results.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0084","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67091193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Dynamic and Thermal Processes in the Mid-Latitude Ionosphere over Kharkov, Ukraine (49.6° N, 36.3° E), During the 13–15 November 2012 Magnetic Storm: Calculation Results 2012年11月13-15日磁暴期间乌克兰哈尔科夫(49.6°N, 36.3°E)中纬度电离层的动力和热过程:计算结果

IF 2.3 4区地球科学

Acta Geophysica Pub Date : 2016-12-28 DOI: 10.1515/acgeo-2016-0087

M. Lyashenko

引用次数: 2

An Estimation Method of Pore Structure and Mineral Moduli Based on Kuster-Toksöz (KT) Model and Biot’s Coefficient 基于Kuster-Toksöz (KT)模型和Biot系数的孔隙结构和矿物模量估算方法

IF 2.3 4区地球科学

Acta Geophysica Pub Date : 2016-12-28 DOI: 10.1515/acgeo-2016-0108

Da Peng, Cheng Yin, Hu Zhao, Wei Liu

引用次数: 3