Relation between stable isotope in monsoon precipitation in southern Tibetan Plateau and moisture transport history     

Tian  Lide  Yao  Tandong  A.  Numaguti  Duan  Keqin 《中国科学:地球科学(英文版)》2001,44(1):267-274

The moisture transport history to the south of the Tibetan Plateau was modeled using the meteorological data provided by NCEP in this paper, and the modeled results were compared with the measured δ¹⁸O in the south of the Tibetan Plateau. The relation between δ¹⁸O in precipitation in the south of the Tibetan Plateau and moisture trajectories was discussed. The results show that the extremely low δ¹⁸O in precipitation in the south of the Tibetan Plateau is always related to the moisture from the low-level sea surface evaporation. The long-distance transport of moisture also contributes to low δ¹⁸O in precipitation probably due to the rainout process during moisture transport. It is also found that low δ¹⁸O in precipitation is also related with deep layer transport of moisture, and with intensive condensation in the upper layers of the atmosphere, resulting in low δ¹⁸O because of depletion of heavy isotopes in deep condensation. However, high δ¹⁸O in precipitation whether in monsoon period or not is always companied with moisture coming from the upper layers, and the moisture is from northern or western sides of the plateau. The interpretation of the modeled results is in agreement with the isotope fractionation processes.

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固体潮观测资料平滑处理方法的研究     

苏其辉  段燕飞  胡毅力  吴康森 《大地测量与地球动力学》1993,(4)

固体潮观测数据在进行各种分析之前,需进行平滑处理以便消除各种突跳及错误数据。常用的平滑方法有Lecolazet数字滤波法和Nakai方法。本文讨论了各种方法的特点及存在问题。为了经济、快速而又有效地平滑数据,提出如下建议:对于高精度的观测数据,通常使用数字滤波法处理即可;在少数情况下,数据中出现连续错数,这时可取卅天为时间间隔,在上述滤波法平滑的基础上,分段对数据进行调和分析,如果某几段调和分析的误差较大,那末再进一步对这些数据段用Nakai法进行平滑处理。  相似文献   

地震数据流服务器的优化与改进     

李勇  段亚楠  樊丽云 《地震地磁观测与研究》2009,30(4):28-33

为提高测震数据流服务器的性能及安全性,提出了采用LVS服务器集群技术构建测震数据流服务器集群的方案,通过选用恰当的IP负载均衡技术及连接调度技术,较好的克服了单台服务器性能瓶颈问题,同时增强了地震数据流服务器系统的容错性及可靠性。  相似文献   

和田地震台阵勘址测量与数据分析   总被引：1，自引：1，他引：0  

段天山  范广超 《地震地磁观测与研究》2009,30(5):96-100

介绍了新疆和田地震台阵候选台址现场勘址测量及后续数据处理分析等内容,为确定台阵的最终台址和子台布局提供了可靠的数据基础。  相似文献   

不同郁闭度天山云杉林林冠截留量及穿透雨量特征研究   总被引：3，自引：0，他引：3  

郝帅  张毓涛  刘端  张洪亮  李翔 《干旱区地理》2009,32(6)

天山云杉(Picea schrenkiana var.tianschanica(Rupr.)Chen et Fu)是构成天山山地森林生态系统的主体。选取天山森林生态系统定位研究站不同郁闭度天山云杉林作为研究对象,研究了不同郁闭度条件下天山云杉林冠截留量及穿透雨量的月变化特征、林冠截留量及穿透雨量与总降雨量间的数量关系,通过研究得出结论:林冠截留率与郁闭度表现出显著正相关关系,而穿透雨比率与郁闭度表现出显著负相关关系;穿透雨量、穿透雨比率及林冠截留量的月变化与总降雨量基本一致,林冠截留率则相反;郁闭度为0.8和0.6、0.4和0.2之间的穿透雨量无显著性差异,0.8和0.6与0.4和0.2之间差异明显,林冠截留量相邻郁闭度间均无显著性差异,而不相邻郁闭度之间均差异显著;建立了穿透雨量及林冠截留量与总降雨量间的数学关系,用以定量评价该地区天山云杉林水文生态效益。  相似文献   

长江三角洲地区经济极化趋势、功能及扩展范围   总被引：2，自引：2，他引：0  

段学军  虞孝感  Josef Nipper 《地理学报(英文版)》2009,19(6):733-749

In the era of economic globalization, the concept of Economic Polarized Area comes into being as an effective vehicle to agglomerate the economic elements and sustain the economic lifeline of the region. Based on the region’s specific development mode and construction form the concept is working in such a way that it will contribute to guide the economic development of the country and will play an important role in competing with other regions or countries in the world. Due to the high speed development of the last 30 years, the Yangtze Delta Region starts to show the features of Economic Polarized Area. But, compared with other world-class Economic Polarized Areas, the economic strength and the ability of the Yangtze Delta Region to drive the country’s economic development is still very low and the competitive power is still very limited. Expanding the boundaries of the Economic Polarized Area of the Yangtze Delta may extend the economic hinterland of the core area of the Yangtze Delta Region, will lighten the pressures from the limited resource and promote the rationalization of the industrial structure in the Yangtze Delta Region’s core area. With regard to the reasonable boundaries of the Yangtze Delta Region, there are different opinions and controversial arguments in political and academic circles. Starting from the idea of increasing the competitive power and improving the economic strength of the Yangtze Delta Region, the paper firstly is discussing the requirements to become a world-class Economic Polarized Area. In a second step an analysis of functional complementation and economic collaboration between the cities of an “extended” Yangtze Delta Region has been carried out by in particular considering the feasibility of integrating these “newly included” cities. The final result of the study is, that the Region should be expanded from the number of 16 cities to 37 cities, and the appended cities should be divided up into two categories: Wenzhou, Jinhua, Yancheng, Huaian, Maanshan, Wuhu, Tongling, Chaohu, Hefei, Chuzhou, Xuancheng should be taken as Preferred Extending Area, and Suqian, Xuzhou, Lianyungang, Lishui, Quzhou, Chizhou, Anqing, Bengbu, Huangshan, Suzhou (Anhui Province) should be taken as Retained Qualification Area.  相似文献   

Control of atmospheric CO<Subscript>2</Subscript> concentrations by 2050: A calculation on the emission rights of different countries   总被引：1，自引：0，他引：1  

ZhongLi Ding  XiaoNan Duan  QuanSheng Ge  ZhiQiang Zhang 《中国科学D辑(英文版)》2009,52(10):1447-1469

This paper is to provide quantitative data on some critical issues in anticipation of the forthcoming international negotiations in Denmark on the control of atmospheric CO2 concentrations. Instead of letting only a small number of countries dominate a few controversial dialogues about emissions reductions, a comprehensive global system must be established based on emissions allowances for different countries, to realize the long-term goal of controlling global atmospheric CO2 concentrations. That a system ...  相似文献   

深海现代沉积有机质碳同位素组成变化的古气候证据   总被引：2，自引：0，他引：2  

段毅  罗斌杰 《海洋地质与第四纪地质》1998,18(4):53-58

分析了南沙海洋深海连续沉积岩心剖面中有机碳同位素,研究了只有机质碳同位素组成变化因素及其与古气候旋回的关系,各种有机地球化学指标综合判识表明,该岩心剖面沉积有机质碳同位素组成变化未受有机质性质和成岩作用的影响,主要与古气候变迁关系密切。其ε＾１３Ｃ低值段对应于晚第四纪末次冰期,高值段对应于末次间冰期。  相似文献   

Preliminary study on the sea level change and its long-term prognostic method for Shanghai     

Qin Zenghao  Li Yongping  Duan Yihong 《海洋学报(英文版)》1998,17(1):27-39

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35°S以北的印度洋的气候状况和季风特征     

姜德忠  陈信雄 《海洋预报》1998,15(4):40-49

３５°Ｓ以北的印度洋位于热带和副热带,北印度洋和印度次大陆及东南亚是全球最显著的季风气候区。北印度洋冬季为东北季风控制;但由于青藏高原阻断了冷空气,没有寒冷天气夏季风在南亚和东南亚陆上主要表现为暴雨,在北印度洋上主要表现为强劲的西南风;特别是在阿拉伯海的索马里急流区,夏季经常有６￣８级以上的西南大风。在春秋季的季风过渡季节,北印度洋时有台风发生,强风暴潮给孟加拉国造成极大的灾难。在春秋季的季风过渡  相似文献