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南黄海辐射沙脊群海域GPS-PPK海测方案应用分析 预览
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作者 张颖 沈卫明 +1 位作者 李静 赵刚 《现代测绘》 2019年第3期46-48,共3页
为解决南黄海辐射沙脊群海域独特地理、水文条件下水深测量的现实困难,提高测量精度,本文将GPS动态后处理技术(GPS-PPK)运用于该海域的水下地形测量工作中。GPS-PPK技术具有控制距离远、无需实时数据传输的优点,是船载一体化水深测量时... 为解决南黄海辐射沙脊群海域独特地理、水文条件下水深测量的现实困难,提高测量精度,本文将GPS动态后处理技术(GPS-PPK)运用于该海域的水下地形测量工作中。GPS-PPK技术具有控制距离远、无需实时数据传输的优点,是船载一体化水深测量时三维精确定位的理想选择。本文在数据结构、GPS-PPK信号频谱定量分析的基础上,提出了GPS-PPK截频滤波及数据匹配方案,使其适用于该海区水深测量并进一步提高测量精度。实验表明,整套方案操作便捷、有效可靠,测量精度较传统验潮方案更高。同时,远距离无验潮测量,节省了大量人力物力,非常值得在广阔的南黄海辐射沙脊群海域浅水环境下推广使用。 展开更多
关键词 南黄海辐射沙脊群 GPS动态后处理技术 水深测量 数值滤波
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DEVELOPMENT AND ASSESSMENT OF QUANTITATIVE PRECIPITATION ESTIMATION ALGORITHMS FOR S-,C-, AND X-BAND DUAL-POLARIZATION RADARS BASED ON DISDROMETER DATA FROM THREE REGIONS OF CHINA
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作者 张扬 刘黎平 +3 位作者 文浩 陈超 王晗 席宝珠 《热带气象学报:英文版》 SCIE 2019年第2期269-292,共24页
The accuracy of quantitative precipitation estimation(QPE) for dual-polarization radars can be improved by using a localized rainfall estimation algorithm derived from the raindrop size distribution(DSD). In the prese... The accuracy of quantitative precipitation estimation(QPE) for dual-polarization radars can be improved by using a localized rainfall estimation algorithm derived from the raindrop size distribution(DSD). In the present study,DSDs observed at Suzhou City, Jiangsu province;Yangjiang City, Guangdong province;and Naqu City, Tibet are analyzed during the rainy season together with the corresponding polarimetric variables for the above three regions.Most importantly, these DSD data are used to develop optimal 'synthetic' QPE algorithms for S-, C-, and X-band dual-polarization radars, which will be built or upgraded in the three regions. Meanwhile, a new piecewise fitting method(PFM) is proposed. It has been found that the number concentration N(D) of small raindrops(D<1 mm) is the highest in Suzhou, while that of larger raindrops(D>1 mm) is the highest in Yangjiang. The characteristics of the differential reflectivity(ZDR) and specific differential phase(KDP) are significantly different in the three locations,suggesting that different rainfall estimators are needed for different locations. Further performance assessment of the QPE based on DSD data indicates that the PFM QPE algorithm(LDSD) performs better than the conventional fitting method(CFM), and the localized QPE algorithm can improve the QPE accuracy. Observations from S-band dual-polarization radars and rain gauges in the Southern China Monsoon Rainfall Experiment are implemented to verify the performances of the QPE algorithms proposed in the present study. It is found that compared with non-localized algorithms, the localized LDSD algorithm yields the best results with at least 7.66% and 8.43% reductions in the RMSE and NE, respectively, which implies that while polarimetric variables can reflect DSD characteristics, the localized QPE algorithm remains necessary. 展开更多
关键词 atmospheric SOUNDING QUANTITATIVE PRECIPITATION estimation PIECEWISE fitting method drop size distribution localized QPE algorithm
Striping Noise Analysis and Mitigation for Microwave Temperature Sounder-2 Observations 预览
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作者 Xiaolei ZOU Xiaoxu TIAN 《大气科学进展:英文版》 SCIE CAS CSCD 2019年第7期711-720,共10页
The Microwave Temperature Sounder(MWTS)-2 has a total of 13 temperature-sounding channels with the capability of observing radiance emissions from near the surface to the stratosphere. Similar to the Advanced Technolo... The Microwave Temperature Sounder(MWTS)-2 has a total of 13 temperature-sounding channels with the capability of observing radiance emissions from near the surface to the stratosphere. Similar to the Advanced Technology Microwave Sounder(ATMS), striping pattern noise, primarily in the cross-track direction, exists in MWTS-2 radiance observations. In this study, an algorithm based on principal component analysis(PCA) combined with ensemble empirical mode decomposition(EEMD) is described and applied to MWTS-2 brightness temperature observations. It is arguably necessary to smooth the first three principal component(PC) coefficients by removing the first four intrinsic mode functions(IMFs) using the EEMD method(denoted as PC3/IMF4). After the PC3/IMF4 noise mitigation, the striping pattern noise is effectively removed from the brightness temperature observations. The noise level in MWTS-2 observations is significantly higher than that detected in ATMS observations. In May 2014, the scanning profile of MWTS-2 was adjusted from varying-speed scanning to constantspeed scanning. The impact on striping noise levels brought on by this scan profile change is also analyzed here. The striping noise in brightness temperature observations worsened after the profile change. Regardless of the scan profile change, the striping noise mitigation method reported in this study can more or less suppress the noise levels in MWTS-2 observations. 展开更多
关键词 MWTS-2 striping noise TEMPERATURE SOUNDING MICROWAVE RADIOMETRY
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Verification of Fengyun-3D MWTS and MWHS Calibration Accuracy Using GPS Radio Occultation Data
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作者 Xueyan HOU Yang HAN +1 位作者 Xiuqing HU Fuzhong WENG 《气象学报:英文版》 SCIE CSCD 2019年第4期695-704,共10页
The newly launched Fengyun-3D(FY-3D)satellite carries microwave temperature sounder(MWTS)and microwave humidity sounder(MWHS),providing the global atmospheric temperature and humidity measurements.It is important to a... The newly launched Fengyun-3D(FY-3D)satellite carries microwave temperature sounder(MWTS)and microwave humidity sounder(MWHS),providing the global atmospheric temperature and humidity measurements.It is important to assess the in orbit performance of MWTS and MWHS and understand their calibration accuracy before using them in numerical weather prediction and many other applications such as hurricane monitoring.This study aims at quantifying the biases of MWTS and MWHS observations relative to the simulations from the collocated Global Positioning System(GPS)radio occultation(RO)data.Using the collocated FY-3C Global Navigation Satellite System Occultation Sounder(GNOS)RO data under clear-sky conditions as inputs to Community Radiative Transfer Model(CRTM),brightness temperatures and viewing angles are simulated for the upper level sounding channels of MWTS and MWHS.In order to obtain O–B statistics under clear sky conditions,a cloud detection algorithm is developed by using the two MWTS channels with frequencies at 50.3 and 51.76 GHz and the two MWHS channels with frequencies centered at 89 and 150 GHz.The analysis shows that for the upper air sounding channels,the mean biases of the MWTS observations relative to the GPS RO simulations are negative for channels 5–9,with absolute values<1 K,and positive for channels 4 and 10,with values<0.5 K.For the MWHS observations,the mean biases in brightness temperature are negative for channels 2–6,with absolute values<2.6 K and relatively small standard deviations.The mean biases are also negative for channels 11–13,with absolute values<1.3 K,but with relatively large standard deviations.The biases of both MWTS and MWHS show scan-angle dependence and are asymmetrical across the scan line.The biases for the upper air MWTS and MWHS sounding channels are larger than those previously derived for the Advanced Technology Microwave Sounder. 展开更多
关键词 SATELLITES Fengyun satellites microwave sounding CROSS-CALIBRATION radio occultation
石家庄地区大气水汽的反演模型
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作者 武紫超 胡引翠 +2 位作者 田冰 程雅琪 张文静 《干旱区研究》 CSCD 北大核心 2019年第2期365-372,共8页
研究大气水汽的反演及了解其时空变化,对有效评估大气生态服务功能具有重要现实意义。基于石家庄地区CE-318观测的大气水汽数据,结合探空水汽数据和地面水汽压数据,运用传统回归分析、改进型回归分析、分段反演等方法,构建传统回归模型... 研究大气水汽的反演及了解其时空变化,对有效评估大气生态服务功能具有重要现实意义。基于石家庄地区CE-318观测的大气水汽数据,结合探空水汽数据和地面水汽压数据,运用传统回归分析、改进型回归分析、分段反演等方法,构建传统回归模型、基于CE-318的大气水汽改进型模型和分季节模型3种大气水汽反演模型,并经过精度对比评估选出适用于研究区的大气水汽最优反演模型。检验结果表明,基于CE-318的大气水汽改进型反演模型的各项精度检验指标均为3个模型中的最佳值,是该地区最优的大气水汽反演模型。 展开更多
关键词 大气水汽 CE-318 探空 地面水汽压 反演模型 石家庄
An Analysis of the Discontinuity in Chinese Radiosonde Temperature Data Using Satellite Observation as a Reference
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作者 Yanjun GUO Chengzhi ZOU +1 位作者 Panmao ZHAI Guofu WANG 《气象学报:英文版》 SCIE CSCD 2019年第2期289-306,共18页
Reconciling upper-air temperature trends derived from radiosonde and satellite observations is a necessary step to confidently determine the global warming rate. This study examines the raw and homogenized radiosonde ... Reconciling upper-air temperature trends derived from radiosonde and satellite observations is a necessary step to confidently determine the global warming rate. This study examines the raw and homogenized radiosonde observations over China and compares them with layer-mean atmospheric temperatures derived from satellite microwave observations for the lower-troposphere(TLT), mid-troposphere(TMT), upper-troposphere(TUT), and lower-stratosphere(TLS) by three research groups. Comparisons are for averages over China, excluding the Tibetan Plateau, and at individual stations where metadata contain information on radiosonde instrument changes. It is found that major differences between the satellite and radiosonde observations are related to artificial systematic changes. The radiosonde system updates in the early 2000 s over China caused significant discontinuities and led the radiosonde temperature trends to exhibit less warming in the middle and upper troposphere and more cooling in the lower stratosphere than satellite temperatures. Homogenized radiosonde data have been further adjusted by using the shift-point adjustment approaches to match with satellite products for China averages. The obtained trends during 1979–2015 from the re-adjusted radiosonde observation are respectively 0.203 ± 0.066, 0.128 ± 0.044, 0.034 ± 0.039, and –0.329 ± 0.135 K decade–1 for TLT, TMT, TUT, and TLS equivalents. Compared to satellite trends, the re-adjusted radiosonde trends are within 0.01 K decade–1 for TMT and TUT, 0.054 K decade–1 warmer for TLT, and 0.051 K decade–1 cooler for TLS. The results suggest that the use of satellite data as a reference is helpful in identifying and removing inhomogeneities of radiosonde temperatures over China and reconciling their trends to satellite microwave observations. Future efforts are to homogenize radiosonde temperatures at individual stations over China by using similar approaches. 展开更多
关键词 RADIOSONDE TEMPERATURE HOMOGENIZATION satellite microwave SOUNDING unit China upper air TEMPERATURE TRENDS
CFL-06型风廓线雷达与L波段探空雷达测风对比分析 预览
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作者 齐佳慧 郝巨飞 耿飞 《气象与环境科学》 2019年第2期135-143,共9页
为探讨风廓线雷达资料的准确性和可用性,将2016年5月2017年4月张家口的风廓线雷达与L波段探空雷达测风资料进行对比分析。结果表明:1)张家口站大多高度层二者风速呈显著正相关,00:00的相关性优于12:00的,8km以上未通过显著性检验。2)4.1... 为探讨风廓线雷达资料的准确性和可用性,将2016年5月2017年4月张家口的风廓线雷达与L波段探空雷达测风资料进行对比分析。结果表明:1)张家口站大多高度层二者风速呈显著正相关,00:00的相关性优于12:00的,8km以上未通过显著性检验。2)4.11km以下风廓线雷达较L波段探空雷达水平风速偏大,平均误差为0.00~1.50m/s;4.11km以上风廓线雷达较L波段探空雷达水平风速偏小,平均误差为0.00~22.13m/s,并随高度的增加而增大。3)水平风速有效样本率(风速差≤3m/s)整体随高度增加呈先增大后减小的趋势,中低层(1.23~3.63km)的有效样本率较高,为60.0%~70.0%。4)2.196.03km各高度层水平风向的有效样本率(风向差≤20°)较大,稳定在70%~80%,有降水时风向有效样本率随高度的增高而增大,且各高度层波动较大。两个时次风向有效样本多集中在风向差为10°的范围内,28km各高度层有效样本率(风向差≤10°)可达到40%~60%。 展开更多
关键词 风廓线雷达 探空 相关性 误差分析 有效样本率
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Crustal Structure Revealed by a Deep Seismic Sounding Profile of Baijing-Gaoming-Jinwan in the Pearl River Delta 预览
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作者 ZHANG Xiang YE Xiuwei +2 位作者 LV Jinshui SUN Jinlong WANG Xiaona 《中国海洋大学学报:英文版》 SCIE CAS CSCD 2018年第1期186-194,共9页
The Pearl River Estuary area,located in the middle part of the southern China coastal seismic belt,has long been considered a potential source of strong earthquakes above magnitude 7.0.To scientifically assess the pot... The Pearl River Estuary area,located in the middle part of the southern China coastal seismic belt,has long been considered a potential source of strong earthquakes above magnitude 7.0.To scientifically assess the potential strong earthquake risk in this area,a three-dimensional artificial seismic sounding experiment,consisting of a receiving array and seabed seismograph,was performed to reveal the deep crustal structure in this region.We used artificial ship-borne air-gun excitation shots as sources,and fixed and mobile stations as receivers to record seismic data from May to August 2015.This paper presents results along a line from the western side of the Pearl River Estuary to the western side of the Baijing-Gaoming-Jinwan profile.A two-dimensional velocity structure was constructed using seismic travel-time tomography.The inversion results show that the Moho depth is 27 km in the coastal area and 30km in the northwest of the Pearl River Estuary area,indicating that the crust thins from land to sea.Two structural discontinuities and multiple low-velocity anomalies appear in the crustal section.Inside both discontinuity zones,a low-velocity layer,with a minimum velocity of 6.05kms?1,exists at a depth of about 15 km,and another,with a minimum velocity of 6.37kms?1,exists at a depth of about 21.5km between the middle and lower crust.These low velocities suggest that the discontinuities may consist of partly molten material.Earthquakes with magnitudes higher than 5.0 occurred in the low-velocity layer along the profile.The deep Kaiping-Enping fault,rooted in the crust,may be one of the most important channels for deep material upwelling and is related to tectonic movement since the Cretaceous in the Pearl River Delta tectonic rift basin. 展开更多
关键词 Pearl River Estuary seismic SOUNDING PROFILE CRUSTAL structure Kaiping-Enping fault earthquake potential
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Spatial Channel Sounding Based on Bistatic Synthetic Aperture Radar Principles 预览
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作者 Lin-Li Cui David G.Michelson Wen-Qin Wang 《电子科技学刊:英文版》 CAS CSCD 2018年第3期251-268,共18页
In this paper,we propose a simplified spatial channel sounding method by utilizing bistatic synthetic aperture radar(BiSAR)principles.Despite the different deployment geometries compared with a conventional BiSAR syst... In this paper,we propose a simplified spatial channel sounding method by utilizing bistatic synthetic aperture radar(BiSAR)principles.Despite the different deployment geometries compared with a conventional BiSAR system,the feasibility of the approach is established by 1)the proposed method achieves a better spatial resolution than conventional directional channel sounders and 2)reconstruction algorithms based on time-domain backprojection in conjunction with a digital elevation model provide a good imaging performance and are suitable for reconstructing the spatial distribution of scatterers.Simulations of a high-speed rail(HSR)scenario demonstrate that the estimated power delay profiles(PDPs)and power angle profiles(PAPs)are close to the actual values. 展开更多
关键词 BISTATIC synthetic APERTURE radar(bistatic SAR) CHANNEL SOUNDING SPATIAL CHANNEL modeling
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不同天气条件下地基微波辐射计探测性能比对 预览 被引量:1
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作者 王志诚 张雪芬 +1 位作者 茆佳佳 王志成 《应用气象学报》 CSCD 北大核心 2018年第3期282-295,共14页
利用探空数据和毫米波云雷达数据,对在大气探测试验基地同址观测的国内外3种型号地基微波辐射计进行1年(2016年10月-2017年9月)的比对分析,重点分析不同型号地基微波辐射计在晴空和云天下温、湿观测性能特征。结果表明:3种型号地基... 利用探空数据和毫米波云雷达数据,对在大气探测试验基地同址观测的国内外3种型号地基微波辐射计进行1年(2016年10月-2017年9月)的比对分析,重点分析不同型号地基微波辐射计在晴空和云天下温、湿观测性能特征。结果表明:3种型号地基微波辐射计温度与探空相关系数均超过0.98,达到0.01显著性水平;晴空条件下,德国及国产地基微波辐射计温度平均误差均在±1℃以内(前者为负偏差,后者为正偏差),误差较小,美国地基微波辐射计系统偏差约为-1.8℃;3种型号地基微波辐射计均方根误差随高度递增,整体均方根误差以德国地基微波辐射计2.2℃为最小,美国地基微波辐射计3.8℃为最大;在有云条件下,3种型号地基微波辐射计平均误差分布较晴空条件下无明显变化,均方根误差较晴空条件有约增加0.5℃。3种型号地基微波辐射计均呈晴空相对湿度误差小于云天误差,低空误差小于中高空误差的特点;晴空条件下,美国与国产地基微波辐射计相对湿度均方根误差分别为15%和18%左右,小于德国地基微波辐射计;云天条件下3种型号微波辐射计均方根误差均较大(26%左右)。 展开更多
关键词 地基微波辐射计 误差分析 探空 温度 相对湿度
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机载LiDAR测深在海洋测绘中应用的可行性分析 预览
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作者 刘智敏 杨安秀 +3 位作者 阳凡林 宿殿鹏 冯成凯 王明伟 《海洋测绘》 CSCD 2018年第4期43-47,共5页
针对海洋测绘中遇到的环境恶劣、任务繁重等情况,分析了机载LiDAR测深应用到海洋测绘中的可 行性.介绍机载LiDAR测深原理、优势、典型设备,针对系统最大穿透深度、最浅探测深度、测点密度及测深精度 等关键技术指标进行分析.最终得出结... 针对海洋测绘中遇到的环境恶劣、任务繁重等情况,分析了机载LiDAR测深应用到海洋测绘中的可 行性.介绍机载LiDAR测深原理、优势、典型设备,针对系统最大穿透深度、最浅探测深度、测点密度及测深精度 等关键技术指标进行分析.最终得出结论,机载LiDAR测深符合海洋测绘的需求,应用到海洋测绘中是切实可行的. 展开更多
关键词 海洋测绘 水深测量 机载LiDAR测深 测点密度 测深精度比对
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海底地形测量成果的质量检核评估(四):自容式压力验潮仪验潮零点漂移处理实践 预览 被引量:1
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作者 黄辰虎 唐少华 +4 位作者 董利斌 陆秀平 孙维康 邓凯亮 黄贤源 《海洋测绘》 CSCD 2018年第2期1-4,20共5页
针对使用自容式压力验潮仪在布设临时验潮站时常出现的验潮零点漂移技术难题,基于附近长期验潮站的潮汐观测数据来计算二站同步时段内逐时日平均海面之差值,以此修正临时验潮站观测数据中隐含的验潮零点逐时漂移量。以福建平潭长期站和... 针对使用自容式压力验潮仪在布设临时验潮站时常出现的验潮零点漂移技术难题,基于附近长期验潮站的潮汐观测数据来计算二站同步时段内逐时日平均海面之差值,以此修正临时验潮站观测数据中隐含的验潮零点逐时漂移量。以福建平潭长期站和王爷山、牛山岛两个临时站的验潮数据为例,进行了自容式压力验潮仪验潮零点漂移处理的实践。结果表明本文相关模型具可操作性和实用价值。 展开更多
关键词 水深测量 水位控制 验潮站 验潮零点 日平均海面 余水位
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多型号地基微波辐射计亮温准确性比对 预览
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作者 茆佳佳 张雪芬 +4 位作者 王志诚 杨荣康 潘旭光 季承荔 郭然 《应用气象学报》 CSCD 北大核心 2018年第6期724-736,共13页
目前,国内外对于地基微波辐射计的探测能力多从温湿廓线等二级产品级进行考察,其误差包含反演算法和硬件系统两部分的贡献,不易区分。为直接考察硬件系统的观测性能,试验将评估对象前移,直接对一级亮温数据进行比对分析。利用2016年1月-... 目前,国内外对于地基微波辐射计的探测能力多从温湿廓线等二级产品级进行考察,其误差包含反演算法和硬件系统两部分的贡献,不易区分。为直接考察硬件系统的观测性能,试验将评估对象前移,直接对一级亮温数据进行比对分析。利用2016年1月-2018年3月中国气象局大气探测试验基地4台地基微波辐射计和业务探空的同址观测数据,以探空数据输入MonoRTM辐射传输模型得到的正演亮温为参考,考察不同天气、不同季节微波辐射计的探测准确性。结果表明:国产与进口设备观测亮温的准确性相当。4台地基微波辐射计实测亮温与模拟亮温相关性较好,相关系数基本超过0.9,均达到0.001显著性水平。晴空条件下,实测亮温较模拟亮温均方根误差平均为2.08~3.75K;德国辐射计亮温偏差最小,各通道平均偏差为1.08K,均方根误差平均为2.08K。亮温偏差在冬季最小,夏季达到最大。建议提高定标准确度并进行质量控制以确保亮温准确性,谨慎使用降水期间辐射计的观测数据。 展开更多
关键词 微波辐射计 误差分析 探空 亮温 MonoRTM模型
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利用Tatarski方案估算不同环境下的光学湍流廓线 预览
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作者 蔡俊 李学彬 +1 位作者 武鹏飞 吴晓庆 《红外与激光工程》 CSCD 北大核心 2018年第11期274-280,共7页
大气光学湍流的存在会严重制约光学系统的性能。为了能够降低大气湍流的影响,满足光电工程的应用,准确地估算出不同场景下的大气光学湍流廓线具有十分重要的指导意义。基于Tatarski光学湍流参数化方案和广泛应用的外尺度模式,利用探空... 大气光学湍流的存在会严重制约光学系统的性能。为了能够降低大气湍流的影响,满足光电工程的应用,准确地估算出不同场景下的大气光学湍流廓线具有十分重要的指导意义。基于Tatarski光学湍流参数化方案和广泛应用的外尺度模式,利用探空仪测量的气象探空数据,对内陆(合肥)、海陆交界处(茂名)和远海海洋这三个不同环境下的大气光学湍流廓线进行估算。将合肥和茂名两地的估算值与实际观测的廓线进行对比验证,发现在变化趋势和量级上相近,为该模式估算远海海洋的大气光学湍流廓线提供了依据。结果表明模式能够较好地估算出不同环境下的光学湍流廓线。此外,还发现高空光学湍流的发生与风切变和温度梯度有重要关系。 展开更多
关键词 光学湍流廓线 湍流参数化 外尺度 探空
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内蒙古自治区霍日奇坎金银多金属矿地球物理特征及成矿预测 预览
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作者 曹军 张华川 周毅 《世界有色金属》 2017年第12期153-155,共3页
霍日奇坎金银多金属矿预查区行政区划隶属内蒙古自治区呼伦贝尔市莫力达瓦达斡尔族自治旗塔温克敖宝镇管辖。本次勘查工作完成主要工作量为:1:10000地质草测14km2,1:10000激电中梯测量6.94km2,激电测深14个点。圈定激电异常4处;圈定... 霍日奇坎金银多金属矿预查区行政区划隶属内蒙古自治区呼伦贝尔市莫力达瓦达斡尔族自治旗塔温克敖宝镇管辖。本次勘查工作完成主要工作量为:1:10000地质草测14km2,1:10000激电中梯测量6.94km2,激电测深14个点。圈定激电异常4处;圈定两条金矿体和三条金矿(化)体,取得了较好的找矿效果。 展开更多
关键词 霍日奇坎金银多金属 激电测深 金矿体
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Chinese radioglaciological studies on the Antarctic ice sheet:progress and prospects 预览
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作者 CUI Xiangbin WANG Tiantian +2 位作者 SUN Bo TANG Xueyuan GUO Jingxue 《极地科学进展:英文版》 2017年第3期161-170,共10页
Chinese radioglaciological studies on the Antarctic ice sheet(AIS)began in 2004/05 when the 21st Chinese National Antarctic Research Expedition(CHINARE 21)team arrived at Dome A for the first time and radio echo sound... Chinese radioglaciological studies on the Antarctic ice sheet(AIS)began in 2004/05 when the 21st Chinese National Antarctic Research Expedition(CHINARE 21)team arrived at Dome A for the first time and radio echo sounding(RES)was conducted along the inland traverse and in the Dome A region.Subsequently,more field surveys were conducted along the traverse and in the Dome A region using different radar systems targeting different scientific purposes,such as revealing the landscape of the Gamburtsev Subglacial Mountains by detailed grid RES,or locating a deep ice core drilling site by mapping and studying internal structures,bedrock topography and subglacial conditions in the Dome A region.Furthermore,the evolution of the AIS was inferred from the typical mountain glaciation topography beneath Dome A,and the age of the deep ice core at Kunlun Station was estimated through numerical modeling.Recently,the Snow Eagle 601 airplane was acquired and an airborne geophysical system was constructed to survey the AIS in Princess Elizabeth Land during CHINARE 32(2015/16)and CHINARE 33(2016/17)in order to fill the large data gap there.In this paper,we review both the recent progress of Chinese radioglaciological science in Antarctica and future proposed work. 展开更多
关键词 ANTARCTIC ice sheet radioglaciology Snow EAGLE radio ECHO SOUNDING CHINESE ANTARCTIC EXPEDITION
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内蒙古霍日奇坎金银矿地球化学特征及成矿预测 预览
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作者 张华川 曹军 周毅 《世界有色金属》 2017年第11期162-164,共3页
霍日奇坎矿区行政区划隶属呼伦贝尔市塔温克敖宝镇管辖。本次勘查工作1:1万土壤化探测量14km^2,化学分析样228件,基岩光谱样211件,土壤化探样3780件。圈定两条金矿体,取得较好的找矿效果。
关键词 金银矿 化探 金矿体
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GPS/MET误差分析及其在降水预报中的应用 预览 被引量:1
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作者 王洪 张恩红 +1 位作者 孟金 徐晓琳 《中国水土保持科学》 CSCD 北大核心 2017年第2期85-91,共7页
GPS/MET反演的大气可降水量产品具有近实时、全天候等优点,可为全国水土保持领域的组网监测提供更多的数据支持,GPS/MET的数据质量对降水预报分析尤为重要。本研究将GPS大气可降水量与探空、微波辐射计进行对比,分析GPS/MET的数据质量;... GPS/MET反演的大气可降水量产品具有近实时、全天候等优点,可为全国水土保持领域的组网监测提供更多的数据支持,GPS/MET的数据质量对降水预报分析尤为重要。本研究将GPS大气可降水量与探空、微波辐射计进行对比,分析GPS/MET的数据质量;同时,分析GPS大气可降水量与地面降水的关系,探索GPS/MET在邻近降水预报中的作用。结果显示:1)2015年GPS大气可降水量与探空、微波辐射计的演变趋势总体一致,波峰和波谷有很好的对应性,全年看整层大气水汽含量存在着明显的月际变化,随时间呈单峰曲线分布;因此GPS/MET能较好的反映大气中可降水量随时间的变化。2)虽然GPS/MET与微波辐射计、探空2种探测手段的平均偏差较大,但是离散程度不大,说明GPS/MET与其余2种探测方法之间存在稳定的系统误差。3)大气可降水量在地面降水发生前十几个小时开始增大,随后维持在一个高值的水平上,说明在降水前大气中有一个明显的水汽积累的过程。地面降水发生时大气可降水量达到最大值,降雨强度的极大值与可降水量的极大值有很好的对应。地面降水过程结束后,可降水量量迅速下降。4)大气可降水量的极大值是降水产生的必要条件。综合考虑降水次数和降水概率后,选取大气可降水量连续4 h增加6 mm以上为判断降水发生的依据之一;因此,GPS/MET数据质量较可靠且在降水预报中具有指示性作用,作为气象和水土保持学科交叉的纽带,可为水土保持业务和决策部门决策分析和制定方面提供数据支撑。 展开更多
关键词 GPS/MET 可降水量 探空 微波辐射计 降水
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Application of high-frequency magnetotelluric method in porphyry copper deposit exploration:a case study of Duobaoshan deposit area 预览
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作者 LIU Caihua QU Xin +4 位作者 FENG Xuan TTAN You LIU Yang QIAO Hanqing WANG Shiyu 《世界地质:英文版》 2017年第4期246-252,共7页
The Duobaoshan mine area in Heilongjiang is located in the northeast section of Xingmeng orogenic belt and is in the west side of Hegang Mountain-Heihe fault zone. There exist many deposits in this area, and its metal... The Duobaoshan mine area in Heilongjiang is located in the northeast section of Xingmeng orogenic belt and is in the west side of Hegang Mountain-Heihe fault zone. There exist many deposits in this area, and its metallogenic conditions are superior, which has been one of the hotspots in geological prospecting and metallogenic research in Northeast China. On the basis of previous studies, the authors used the EH^I- electromagnetic imaging system to carry out the data acquisition of three survey lines in Woduhe Village, Duobaoshan Town,Nenjiang County. Through the analysis of apparent resistivity section under TE and TM polarization modes, integrating regional geological data, it is concluded that: (T) the electrical characteristics of the metal ore in this area show a relatively low resistance, and according to its resistivity difference with surrounding rocks, the geometrical structures and apparent resistivity parameters of the low resistivity bodies in the lower section of the survey line are defined, and the electrical anomalies can be identified; (2)faults FI and F2 may have a good metallogenic environment, so they are recommended for further exploration ; (3) low resistance metal ore bodies have good correlation with local small structures or faults, which may play an iconic role for the delineation of key target areas; (4) in the process of using apparent resistivity to define the geometric structures of ore bodies underground , comprehensive analysis integrating the advantages of TE and TM models should be carry out to achieve more reliable inversion results. 展开更多
关键词 MAGNETOTELLURIC SOUNDING ( MT) apparent resistivity Xing’an Mongolia OROGENIC belt PORPHYRY copper DEPOSIT Duobaoshan ore concentration area
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花岗岩地区浅部地下水井位的快速确定 预览 被引量:1
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作者 杨天春 张正发 +1 位作者 许德根 曹书锦 《水文地质工程地质》 CSCD 北大核心 2017年第5期20-24,32共6页
文章探讨在花岗岩地区地下水井位的快速定位问题,结合工程实践,采用三极电阻率测深法和天然电场选频法开展综合探测研究。首先实施三极电阻率测深剖面工作,对采集结果进行二维有限元反演研究,获得二维测深断面上低阻导电体的分布规律;... 文章探讨在花岗岩地区地下水井位的快速定位问题,结合工程实践,采用三极电阻率测深法和天然电场选频法开展综合探测研究。首先实施三极电阻率测深剖面工作,对采集结果进行二维有限元反演研究,获得二维测深断面上低阻导电体的分布规律;在测深剖面上进一步开展天然电场选频法剖面勘探工作,得到低阻含水构造的水平精确位置,并进一步开展选频测深法的实践。后期的成井结果表明:三极电测深勘探成果的剖面异常比较直观,选频法则在异常体的地表水平定位方面比较精确,施工非常方便,两种方法相结合对地下水进行综合勘探是一种行之有效的办法。 展开更多
关键词 测深 天然电场选频法 地下水 花岗岩
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