In this study,a quasi-global(excluding the Arctic Ocean) eddy-resolving ocean general circulation model(OGCM) is established based on the latest version of the LASG/IAP Climate system Ocean Model(LICOM2.0).The horizon...In this study,a quasi-global(excluding the Arctic Ocean) eddy-resolving ocean general circulation model(OGCM) is established based on the latest version of the LASG/IAP Climate system Ocean Model(LICOM2.0).The horizontal resolution and vertical resolution are increased to 1/10° and 55 layers,respectively.Forced by the surface fluxes from the reanalysis and observed data,the model has been integrated for approximately 20 model years(20 a).During the last 8 a,the model is driven by daily mean wind stresses from QuikSCAT and heat fluxes from reanalysis data from 2000 to 2007.The basic performance of the OGCM is analyzed using the last 8 a simulation output.Compared with the simulation of the coarse-resolution OGCM,the eddy-resolving OGCM not only better simulates the spatial-temporal features of mesoscale eddies and the paths and positions of western boundary currents but also reproduces the large meander of the Kuroshio Current and its interannual variability.Another aspect,namely,the complex structures of equatorial Pacific currents and currents in the coastal ocean of China,are better captured due to the increased horizontal and vertical resolution.展开更多
本文从垂直分辨率、时间更新频率和要素完整性三个方面,对水平网格距为1 km的华南区域短时临近预报模式(TRAMSRUC1 km:Tropical Region Assimilation Model for South China SeaThe Rapid Update Cycle1 km)中的初始场和侧边界方案进行...本文从垂直分辨率、时间更新频率和要素完整性三个方面,对水平网格距为1 km的华南区域短时临近预报模式(TRAMSRUC1 km:Tropical Region Assimilation Model for South China SeaThe Rapid Update Cycle1 km)中的初始场和侧边界方案进行改进研究。首先选择一次华南飑线个例进行敏感性试验,研究结果表明:(1)提高初始场和侧边界的垂直分辨率以后,模式对飑线内部中小尺度对流系统引起的强降水中心的模拟结果明显更加接近实况,而增加中低层的垂直分辨率对预报的改进起到了主要作用。(2)将模式侧边界时间更新频率从6 h一次提高到1 h一次以后,模式侧边界要素场的逐小时剧烈变化信息可以比较完整的保留下来。在使用高时间分辨率的侧边界条件进行模拟时,粤西沿海地区的水汽辐合明显加强,这对原来模式预报飑线移速偏慢现象会有改善作用。(3)当模式侧边界条件具有较高的时空分辨率时,进一步补充垂直速度和云微物理变量的侧边界条件对于飑线模拟结果的影响并不明显。总的来说,提高初始场和侧边界的垂直分辨率以及增加侧边界更新的时间分辨率,对于区域高分辨率模式对这次华南飑线预报效果的改进具有重要意义,而忽略垂直速度和云微物理量的侧边界条件则是一种可以接受的简化。在个例研究的基础上,利用改进后的初、边界条件进行为期一个月(2019年4月份)的批量试验,评估结果表明新方案对于逐小时降水空间分布和日变化特征的模拟均有明显改善。展开更多
With the objective of establishing the necessary conditions for 3D seismic data from mountainous areas in western China, we compared the application results of wave impedance technology in the lithology and exploratio...With the objective of establishing the necessary conditions for 3D seismic data from mountainous areas in western China, we compared the application results of wave impedance technology in the lithology and exploration of coal fields. First, we introduce principles and features of three kinds of inversion methods. i.e., Model-Based Inversion, Constrained Sparse Spike Inversion (CSSI) and Geology-Seismic Feature Inversion. Secondly, these inversion methods are contrasted in their application to 3D seismic data from some coalfields in western China. The main information provided by the research includes: improving the vertical resolution of coal deposit strata, inferring lateral variation of the lithology and predicting coal seams and their roof lithology. Finally, the comparison between the three methods shows that the model-based inversion has the higher resolution, while CSSI inversion has better waveform continuity. The geology-seismic feature inversion requires information from a large number of wells and many types of logging curves of good quality. All three methods can meet the requirements of seismic exploration for lithological exploration in coal fields.展开更多
基金supported by the National Basic Research Program of China (2010CB950502)the Strategic Priority Research Program -Climate Change:Carbon Budget and Related Issues of the Chinese Academy of Sciences (XDA05110302)+1 种基金the National High-tech R&D Program of China (2010AA012304)China National Science Foundation Committee (40975065 and 41023002)
文摘In this study,a quasi-global(excluding the Arctic Ocean) eddy-resolving ocean general circulation model(OGCM) is established based on the latest version of the LASG/IAP Climate system Ocean Model(LICOM2.0).The horizontal resolution and vertical resolution are increased to 1/10° and 55 layers,respectively.Forced by the surface fluxes from the reanalysis and observed data,the model has been integrated for approximately 20 model years(20 a).During the last 8 a,the model is driven by daily mean wind stresses from QuikSCAT and heat fluxes from reanalysis data from 2000 to 2007.The basic performance of the OGCM is analyzed using the last 8 a simulation output.Compared with the simulation of the coarse-resolution OGCM,the eddy-resolving OGCM not only better simulates the spatial-temporal features of mesoscale eddies and the paths and positions of western boundary currents but also reproduces the large meander of the Kuroshio Current and its interannual variability.Another aspect,namely,the complex structures of equatorial Pacific currents and currents in the coastal ocean of China,are better captured due to the increased horizontal and vertical resolution.
文摘本文从垂直分辨率、时间更新频率和要素完整性三个方面,对水平网格距为1 km的华南区域短时临近预报模式(TRAMSRUC1 km:Tropical Region Assimilation Model for South China SeaThe Rapid Update Cycle1 km)中的初始场和侧边界方案进行改进研究。首先选择一次华南飑线个例进行敏感性试验,研究结果表明:(1)提高初始场和侧边界的垂直分辨率以后,模式对飑线内部中小尺度对流系统引起的强降水中心的模拟结果明显更加接近实况,而增加中低层的垂直分辨率对预报的改进起到了主要作用。(2)将模式侧边界时间更新频率从6 h一次提高到1 h一次以后,模式侧边界要素场的逐小时剧烈变化信息可以比较完整的保留下来。在使用高时间分辨率的侧边界条件进行模拟时,粤西沿海地区的水汽辐合明显加强,这对原来模式预报飑线移速偏慢现象会有改善作用。(3)当模式侧边界条件具有较高的时空分辨率时,进一步补充垂直速度和云微物理变量的侧边界条件对于飑线模拟结果的影响并不明显。总的来说,提高初始场和侧边界的垂直分辨率以及增加侧边界更新的时间分辨率,对于区域高分辨率模式对这次华南飑线预报效果的改进具有重要意义,而忽略垂直速度和云微物理量的侧边界条件则是一种可以接受的简化。在个例研究的基础上,利用改进后的初、边界条件进行为期一个月(2019年4月份)的批量试验,评估结果表明新方案对于逐小时降水空间分布和日变化特征的模拟均有明显改善。
基金part of an ongoing project of the National Important Industry Technological Development Project (High Precision 3D Seismic Technology of Coal Resources of Western China)the financial support from the National Basic Research Program of China (No.2009CB 219603)the National Key Scientific and Technological Project of China (No.2008ZX05035-005-003HZ)
文摘With the objective of establishing the necessary conditions for 3D seismic data from mountainous areas in western China, we compared the application results of wave impedance technology in the lithology and exploration of coal fields. First, we introduce principles and features of three kinds of inversion methods. i.e., Model-Based Inversion, Constrained Sparse Spike Inversion (CSSI) and Geology-Seismic Feature Inversion. Secondly, these inversion methods are contrasted in their application to 3D seismic data from some coalfields in western China. The main information provided by the research includes: improving the vertical resolution of coal deposit strata, inferring lateral variation of the lithology and predicting coal seams and their roof lithology. Finally, the comparison between the three methods shows that the model-based inversion has the higher resolution, while CSSI inversion has better waveform continuity. The geology-seismic feature inversion requires information from a large number of wells and many types of logging curves of good quality. All three methods can meet the requirements of seismic exploration for lithological exploration in coal fields.
