The study on climatic changes and lake level fluctuations of Qinghai lake in holocene

According to loess and palaeosol climatic record, field observation, analysis data and¹⁴C dating, we discuss the climatic changes and the water level fluctuations of Qinghai Lake. It is pointed out that there were four relatively warm and moist stages in Qinghai Lake basin during the Holocene. They formed in the periods from 10,300 yr.B.P. to 8,500 yr.B.P., 7,000 yr.B.P. to 3,500 yr.B.P., 2,800 yr.B.P. to 2,000 yr.B.P. and from 1,300 yr.B.P. up to now. the climate in the Holocene optimum period, from 7,000 yr.B.P. to 3,500 yr.B.P., was much warmer and moister than that today. Polypodium plant grew luxuriantly around Qinghai Lake. The annual temperature was 2.5°C higher than that today, but there was no forest at Qinghai Lake shore. It is found that there was a good relationship between precipitation and water level fluctuation. In warm and moist period water level was high and in the cold and dry period it was low in the Holocene. There were four high water level periods for Qinghai Lake in the Holocene, but the highest level was less than 30m above present water level. This research is supported by Youth Foundation of Natural Science Foundation of China (No. 49101015).     

THE HOLOCENE SEDIMENTAL CHARACTERISTIC AND PALEOCLIMATIC EVOLUTION OF EBINUR LAKE，XINJIANG

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松辽盆地中生代沉积基准面变化研究

利用地质资料研究来恢复沉积基准面变化。首先根据沉积物的分布规律、沉积构造、古生物组合及古生态、自生矿物和波基面等特征来获得古水深,然后利用对地层做脱水压实校正获得沉积物原始厚度。对湖盆地区古水深和沉积物原始厚度累加起来就可得到沉积基准面变化曲线。沉积基准面变化曲线为在松辽盆地中进行地层对比提供了依据。     

EVIDENCE FOR ABRUPT CLIMATIC CHANGES ON NORTHWESTERN MARGIN OF EAST ASIAN MONSOON REGION DURING LAST DEGLACIATION

Based on investigations of the Zhongwei Nanshan aeolian section situated in the southeastern margin of Tengger Desert, carbon-14 and TL (thermoluminescence) dating results and paleoclimatie proxies such as magnetic susceptibility and grain size, we inferred that the northwestern margin of East Asian monsoon region experienced abrupt climatic changes during the last deglaciation. Six oscillation events were identified: Oldest Dryas, Bφlling, Older Dryas, Allerφd, Intra-Allerφd Cold Period (IACP) and Younger Dryas (YD). The summer monsoon was weaker during Oldest Dryas and Younger Dryas when the winter monsoon was stronger. However, during the B/A (Bφlling/Allerφd) period, the summer monsoon strengthened, reflected by magnetic susceptibility, when the winter monsoon also became strong, which is different from the paleoclimatic pattern established in the East Asian monsoon region. Furthermore, the summer monsoon was nearly in phase with the climate changes inferred from the oxygen isotopic records of     

应变-水位相关斜率异常与地震的关系研究

利用回归分析求解乌鲁木齐台同一钻孔内应变和水位的相关斜率,并用筛选法方差判定其异常,研究相关斜率和地震的关系。结果表明： ①４ 个元件同时出现相关斜率异常时有震率高;②相关斜率正异常映震效果好;③相关斜率属短临异常范畴;④相关斜率异常映震能力具有地区差异性。     

连云港海平面变化与地震相关性的探讨

利用连云港验潮站长达４３年的验潮资料,结合华北地区４次７级以上强震和江苏及其以东黄海海域１８次中强以上地震的震例分析,认为：经基本消除主要干扰因素的连云港平均海平面变化,表征了与地震有关的地壳形变信息。它对监测华北地区强震和江苏及邻近地区的中强震,具有一定的参考价值。     

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数字化体应变与气压、水位相关性研究

通过对山东省体应变与气压，水位，温度等影响因素的相关性研究，以及对M2波潮汐因子均方差等参数的计算，得到了各台站的特征量值；基于不同井孔条件下资料变化的特点，探讨了气压，水位，温度等对各台站产生不同影响的物理机制。     

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FOSSIL PIGMENTS AS INDICATORS FOR PALAEOCLIMATIC INTERPRETATIONS - A CASE STUDY OF QINGHAI LAKE

An 82 cm core was collected from Qinghai Lake in the Qinghai- Xizang Plateau , China and sectioned in intervals of 1 cm for analysis of pigments (i.e. chlorophyll derivatives , carotenoids , myxoxanthophyll .oscillaxanthin) and 210Pb .210Pb dating was used to establish the chronological sequence . The concentrations of myxoxanthophyll and oscillaxanthin from the cyanophytes increase with temperature. There are four peak values at 0-14 cm ( present-1891a), 25cm (1786a), 45cm (1581a) . 60cm (1416a) representing four warm and low water level periods during the past 700 years. This was confirmed by the high concentration of carbonate and 13C in these stages. In these 700 years , there were also 4 periods of cold wet climate and high water level as indicated by the tree ring index and high value of native chlorophyll and high , variable CD/TC ratios .     

洱海水位变化对下关基准点绝对重力观测的影响

分析了20世纪90年代以来在下关基准点上进行的绝对重力重复测量数据及洱海的水文资料。结果显示:2001年12月观测值偏大的主要原因是洱海季节性水位变化,其影响可达10.3×10-8ms-2。     

THE IMPACT OF THE CONTEMPORARY CLIMATIC CHANGE ON CHINAS THERMAL RESOURCES

ＴＨＥＩＭＰＡＣＴＯＦＴＨＥＣＯＮＴＥＭＰＯＲＡＲＹＣＬＩＭＡＴＩＣＣＨＡＮＧＥＯＮＣＨＩＮＡＳＴＨＥＲＭＡＬＲＥＳＯＵＲＣＥＳ￥ＬｉｕＹｕｎｆｅｎ（刘允芬）（ＣｏｍｍｉｓｓｉｏｎｆｏｒＩｎｔｅｇｒａｔｅｄＳｕｒｖｅｙｏｆＮａｔｕｒａｌＲｅｓｏｕｒｃ...     

井水位气压效应特征差异研究

基于三峡井网所在地的地质构造背景、气压变化特征和井孔结构,分析了整个井网井水位气压变化特征及其差异,以及与含水层物理力学参数之间的关系等.分析结果表明,承压井水位气压效应特征差异与含水层岩性、井孔深度有关.     

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IMPACTS OF SEA LEVEL RISE ON COASTAL EROSION IN THE CHANGJIANG RIVER DELTA AND NORTH JIANGSU COASTAL PLAINO

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河南省水资源状况及对策研究

本文论述了河南省水资源分布状况及开发利用现状，依据地下水动态长期监测资料，指出了地下水开采利用中出现的一些环境水文地质问题，并提出了相应的对策。     

THE APPLICABILITY OF RESEARCH ON FLOOD－DROUGHT TENDENCY－AN ANALYSIS ON DISASTROUS FLOOD OF TAIHU LAKE BASININ JUNE－JULY，1991

ＴＨＥ ＡＰＰＬＩＣＡＢＩＬＩＴＹ ＯＦ ＲＥＳＥＡＲＣＨ ＯＮ ＦＬＯＯＤ－ＤＲＯＵＧＨＴ ＴＥＮＤＥＮＣＹ－ＡＮ ＡＮＡＬＹＳＩＳ ＯＮ ＤＩＳＡＳＴＲＯＵＳ ＦＬＯＯＤ ＯＦ ＴＡＩＨＵ ＬＡＫＥ ＢＡＳＩＮＩＮ ＪＵＮＥ－ＪＵＬＹ，１９９１ ...     

确定海平面长趋势变化方法的讨论

本文讨论了在我国海平面研究中常用的线性回归和滑动平均方法确定平均海平面长趋势变化存在的问题,指出当海平面观测系列包含有周期变化成分时,上述两种方法通常不能得到正确的结果。建议先对观测序列作显著周期分析,然后以线性趋势项与显著周期项拟合观测序列的方法来确定平均海面的长趋势变化。     

用图解法表示控制相对海平面变化因素及其对沉积地层分布模式的影响

本文从层序地层学中有关术语（如全球海平面变化、地壳沉降、相对海平面变化、可容纳空间、水深、沉积物保留区、剥蚀区及沉积分布模式等）的概念和基本原理入手，通过列举实例，采用定量方法和作出相应的图件来表示控制相对海平面变化的因素、有关参数间相互关系以及对沉积地层分布模式的影响，旨在进一步加深对层序地层学理论和方法的认识及理解，从而提高区域地层研究程度。     

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