Variations of the alpine precipitation from an ice core record of the Laohugou glacier basin during 1960-2006 in western Qilian Mountains,China     

Xiang QIN  Xiaoqing CUI  Wentao DU  Zhiwen DONG  Jiawen REN  Jizu CHEN 《地理学报(英文版)》2015,25(2):165-176

The net accumulation record of ice core is one of the most reliable indicators for reconstructing precipitation changes in high mountains. A 20.12 m ice core was drilled in 2006 from the accumulation zone of Laohugou Glacier No.12 in the northeastern Tibetan Plateau, China. We obtained the precipitation from the ice core net accumulation during 1960-2006, and found out the relationship between Laohugou ice core record and other data from surrounding sites of the northeastern Tibetan Plateau. Results showed that during 1960-2006, the precipitation in the high mountains showed firstly an increasing trend, while during 1980 to 2006 it showed an obvious decreasing trend. Reconstructed precipitation change in the Laohugou glacier basin was consistent with the measured data from the nearby weather stations in the lower mountain of Subei, and the correlation coefficient was 0.619 (P<0.001). However, the precipitation in the high mountain was about 3 times more than that of the lower mountain. The precipitation in Laohugou Glacier No.12 of the western Qilian Mountains corresponded well to the net accumulation of Dunde ice core during the same period, tree-ring reconstructed precipitation, the measured data of multiple meteorological stations in the northeastern Tibetan Plateau, and also the changes of adjacent PDSI drought index. Precipitation changes of the Laohugou glacier basin and other sites of the northeastern Tibetan Plateau had significantly positive correlation with ENSO, which implied that the regional alpine precipitation change was very likely to be influenced by ENSO.  相似文献   

海陆气候事件关联规则挖掘方法     

石岩  邓敏  刘启亮  杨文涛 《地球信息科学学报》2014,16(2):182-190

近年来,异常气候事件的频发对人类的生活环境和经济发展带来严重负影响。气象学家研究表明：海洋气候异常对陆地气候异常事件的发生具有重要的诱发作用,因此,对海陆气候间的内在关联机制进行深入挖掘具有重要研究价值。本文提出了一种关联规则挖掘方法,以探索单一海洋气候指数与陆地异常气候事件间存在的关联。首先,针对陆地气候要素,采用顾及空间邻近关系的层次聚类方法进行有效气候分区,通过对各层分区结果进行相关统计分析得到有效的各区域气候序列;然后,进行顾及多重约束进行时序关联规则挖掘,以探索海陆气候要素间的关联机制;最后,通过实际算例分析得到的各气候指数与我国陆地区域异常降水事件间的关联机制结果,与实际情况高度吻合。  相似文献   

Modeling the long-term variability of phytoplankton functional groups and primary productivity in the South China Sea     

Wentao Ma  Fei Chai  Peng Xiu  Huijie Xue  Jun Tian 《Journal of Oceanography》2013,69(5):527-544

Primary productivity (PP) and phytoplankton structure play an important role in regulating oceanic carbon cycle. The unique seasonal circulation and upwelling pattern of the South China Sea (SCS) provide an ideal natural laboratory to study the response of nutrients and phytoplankton dynamics to climate variation. In this study, we used a three-dimensional (3D) physical–biogeochemical coupled model to simulate nutrients, phytoplankton biomass, PP, and functional groups in the SCS from 1958 to 2009. The modeled results showed that the annual mean carbon composition of small phytoplankton, diatoms, and coccolithophores was 33.7, 52.7, and 13.6 %, respectively. Diatoms showed a higher seasonal variability than small phytoplankton and coccolithophores. Diatoms were abundant during winter in most areas of the SCS except for the offshore of southeastern Vietnam, where diatom blooms occurred in both summer and winter. Higher values of small phytoplankton and coccolithophores occurred mostly in summer. Our modeled results indicated that the seasonal variability of PP was driven by the East Asian Monsoon. The northeast winter monsoon results in more nutrients in the offshore area of the northwestern Luzon Island and the Sunda Shelf, while the southwest summer monsoon drives coastal upwelling to bring sufficient nutrients to the offshore area of southeastern Vietnam. The modeled PP was correlated with El Niño/Southern Oscillation (ENSO) at the interannual scale. The positive phase of ENSO (El Niño conditions) corresponded to lower PP and the negative phase of ENSO (La Niña conditions) corresponded to higher PP.  相似文献   

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陈醒  程鹏飞  成英燕  范文涛  王晓明  王福丽 《大地测量与地球动力学》2013,33(4):48-51

???ú??CORS?????????4???GPS????????????GAMIT/GLOBK??????е??????????????????????????????????????????????????????????????????????????3???????????????150 mm??11?′??????????4??????????????????10 mm/a????????溯?????????????????????????????????6′×6′?????????????????????????????????  相似文献   

山东潍北凹陷古近系孔店组一段特征及沉积演化          下载免费PDF全文

陈世悦  王玲  周清波  白静波  李文涛  孙廷彬  韩敏 《古地理学报》2012,14(5):553-564

综合运用岩心、钻井、测井及地震资料,对潍北凹陷古近系孔一段的地层特征及沉积演化进行研究。结果表明：潍北凹陷孔店组一段可以划分为3个亚段、11个砂层组。在西部鄌郚—葛沟断裂和东部昌邑—大店断裂控制下,地层东西向发育稳定,仅在北部洼陷带地层显著加厚;在北部古城—潍河口断层控制下,地层向南部超覆,地层由北向南变薄。潍北凹陷孔店组一段主要发育扇三角洲相和湖泊相,南部斜坡带发育小范围三角洲相。孔一下亚段,物源供给充足,北部洼陷带、瓦城断阶带和灶户断鼻带发育大规模的扇三角洲相;孔一中亚段,湖盆水体变浅,物源供给减少,北部洼陷带、瓦城断阶带和灶户断鼻带继承性发育扇三角洲相,但分布范围变小;孔一上亚段,湖盆水体最浅,物源供给少,全区发育滨浅湖亚相,仅在央斜4井区和昌11井区发育小范围的扇三角洲相沉积。  相似文献   

利用TIN和高程梯度进行高程点抽稀     

曹文涛  何伟 《测绘通报》2017,(5):110-112

为了解决系列比例尺地形图缩编过程中高程点的抽稀问题,考虑到高程点分布的密度和地形起伏等因素,基于高程点构建了TIN,再结合平均高程面、高程梯度和局部高程最值点,对高程点进行了筛选抽稀。  相似文献   

全球碳排放空间约束条件下美国退出《巴黎协定》对中欧日碳排放空间和减排成本的影响     

戴瀚程  张海滨  王文涛 《气候变化研究进展》2017,13(5):428-438

应用全球多部门、多区域动态可计算一般均衡（CGE）模型,采用情景分析方法,评估美国退出《巴黎协定》后,由于其碳排放路径的变化对国际气候谈判中的3个重要谈判方中国、欧盟和日本实现国家自主贡献（NDC）和2℃目标情景下碳排放空间和减排成本的影响。结果表明：在全球碳排放固定且分配方式固定的条件下,美国不同程度的退约将为自身获得较大的碳排放空间,同时挤压其他地区,包括中国、欧盟和日本实现NDC和2℃目标的碳排放空间,将推高中国、欧盟和日本实现NDC和2℃目标的碳价。2030年,2℃目标下中国碳价的升幅将达4.4~14.6美元/t,欧盟为9.7~35.4美元/t,日本为16.0~53.5美元/t。同时将增加中国、欧盟和日本等其他国家和地区的GDP损失。2030年,2℃目标下中国GDP损失的升幅将达220.0亿~711.0亿美元（相当于16.4~53.1美元/人）,欧盟为93.5亿~321.4亿美元（相当于20.7~71.1美元/人）,日本为41.3亿~134.5亿美元（相当于34.3~111.7美元/人）。  相似文献   

汶川地震发震构造应力场分析   总被引：1，自引：0，他引：1  

马文涛  徐锡伟  于贵华  徐长朋 《国际地震动态》2010,(6):18-18

通过对汶川8级地震区的地震震源机制资料进行分析,得到了该区域内地震震源机制分布及分类特点,讨论了断裂重新滑动型地震的发震构造应力场的校对问题,提出了使用地震学的定标率来区分破裂型地震和滑动型地震的方法,并给出了汶川地震发震构造应力场的分布,结合龙门山断裂带的几何特征,分析了孕育和发生8级地震的构造原因。  相似文献   

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陈宇波  杨文韬  戴吾蛟 《大地测量与地球动力学》2010,30(2):76-79

?????GPS??????????????Ч?????GPS?????????????????????????????δ???????????????????????????????????????????????е????????????????????????????????????????????Ч?????????????????????????????????????????????????????????  相似文献   

河南留山盆地太山庙组沉积相及遗迹化石特征     

钟明洋  胡斌  刘顺喜  吴海东  杨文涛 《煤田地质与勘探》2010,38(6):5-11

采用沉积学和遗迹学的理论及分析方法,研究了河南留山盆地上三叠统太山庙组的沉积环境。结果显示:该组为一套温暖潮湿气候条件下的河流-湖泊相含煤沉积,整个沉积经历了河流相—湖沼相—滨、浅湖相—深湖相—滨、浅湖相—半深湖相—滨、浅湖相的演化过程,显示该盆地经历了“下降—抬升—下降—抬升”的构造旋回演化过程。在该套地层中已识别出遗迹化石的4个属和4个种,包括Beaconites coronus,Cochlichnus surpuliformis,Palaeophycus tubularis和Planolites montanus等,并详细讨论了该遗迹群落中Beaconites coronus在不同微相中的发育特征,推测其造迹生物最适宜的生境是滨湖环境。该项研究成果可为本区晚三叠世岩相古地理图的编制,进而为矿产资源评价与开发提供理论依据。   相似文献