Haze pollution in early winter(December and January) in the Yangtze River Delta(YRD) and in North China(NC)are both severe;however, their monthly variations are significantly different. In this study, the dominant lar...Haze pollution in early winter(December and January) in the Yangtze River Delta(YRD) and in North China(NC)are both severe;however, their monthly variations are significantly different. In this study, the dominant large-scale atmospheric circulations and local meteorological conditions were investigated and compared over the YRD and NC in each month. Results showed that the YRD(NC) is dominated by the so-called Scandinavia(East Atlantic/West Russia)pattern in December, and these circulations weaken in January. The East Asian December and January monsoons over the YRD and NC have negative correlations with the number of haze days. The local descending motion facilitates less removal of haze pollution over the YRD, while the local ascending motion facilitates less removal of haze pollution over NC in January, despite a weaker relationship in December. Additionally, the monthly variations of atmospheric circulations showed that adverse meteorological conditions restrict the vertical(horizontal) dispersion of haze pollution in December(January) over the YRD, while the associated local weather conditions are similar in these two months over NC.展开更多
通过城市地质调查工作构建地下三维地质结构模型是推动“智慧城市”建设和“地质+”服务的核心技术。以长江三角洲南翼的嘉兴市地理地形图和各类城市地质调查钻孔数据为基础,建立地形图形库、钻孔数据库、构造数据库等基础数据库,结合...通过城市地质调查工作构建地下三维地质结构模型是推动“智慧城市”建设和“地质+”服务的核心技术。以长江三角洲南翼的嘉兴市地理地形图和各类城市地质调查钻孔数据为基础,建立地形图形库、钻孔数据库、构造数据库等基础数据库,结合地理信息系统(geographic information system,GIS)技术、计算机技术、图像处理与可视化技术,构建分析评价子系统功能模块。借助MapGIS K9软件平台的三维软件工具,开展基于地表地质图和地质-地球物理-钻孔联合解译剖面的三维地质模型构建、三维模型可视化、三维模型切割及三维模型隔栅剖面展示的分析研究。精选代表性第四纪地质钻孔116个、工程地质钻孔1106个、水文地质孔445个,分别构建了嘉兴市第四纪三维地质结构模型、工程地质三维结构模型和水文地质三维结构模型,可在任意角度、任意区块获取地层结构和属性信息,展示地下三维地质构造及地层分布特征的可视化效果,可服务于城市地下空间开发利用和规划管理工作,为政府有关部门提供科学决策依据。展开更多
基金supported by the National Key Research and Development Plan (Grant No. 2016YFA0600703)the National Natural Science Foundation of China (Grant Nos. 91744311, 41991283 and 41705058)the funding of the Jiangsu Innovation & Entrepreneurship Team。
文摘Haze pollution in early winter(December and January) in the Yangtze River Delta(YRD) and in North China(NC)are both severe;however, their monthly variations are significantly different. In this study, the dominant large-scale atmospheric circulations and local meteorological conditions were investigated and compared over the YRD and NC in each month. Results showed that the YRD(NC) is dominated by the so-called Scandinavia(East Atlantic/West Russia)pattern in December, and these circulations weaken in January. The East Asian December and January monsoons over the YRD and NC have negative correlations with the number of haze days. The local descending motion facilitates less removal of haze pollution over the YRD, while the local ascending motion facilitates less removal of haze pollution over NC in January, despite a weaker relationship in December. Additionally, the monthly variations of atmospheric circulations showed that adverse meteorological conditions restrict the vertical(horizontal) dispersion of haze pollution in December(January) over the YRD, while the associated local weather conditions are similar in these two months over NC.
文摘通过城市地质调查工作构建地下三维地质结构模型是推动“智慧城市”建设和“地质+”服务的核心技术。以长江三角洲南翼的嘉兴市地理地形图和各类城市地质调查钻孔数据为基础,建立地形图形库、钻孔数据库、构造数据库等基础数据库,结合地理信息系统(geographic information system,GIS)技术、计算机技术、图像处理与可视化技术,构建分析评价子系统功能模块。借助MapGIS K9软件平台的三维软件工具,开展基于地表地质图和地质-地球物理-钻孔联合解译剖面的三维地质模型构建、三维模型可视化、三维模型切割及三维模型隔栅剖面展示的分析研究。精选代表性第四纪地质钻孔116个、工程地质钻孔1106个、水文地质孔445个,分别构建了嘉兴市第四纪三维地质结构模型、工程地质三维结构模型和水文地质三维结构模型,可在任意角度、任意区块获取地层结构和属性信息,展示地下三维地质构造及地层分布特征的可视化效果,可服务于城市地下空间开发利用和规划管理工作,为政府有关部门提供科学决策依据。
