吉林延边汪清县蛤蟆塘盆地白恶纪地层划分及其演化     

陈跃军  周晓东 《吉林地质》1998,(4)

通过１∶５万区调填图（１９８８～１９９０）,笔者将蛤蟆塘盆地白垩纪地层划分为大拉子组、富兴屯砾岩、龙井组。其中大拉子组下部为山麓冲积扇沉积,上部为湖相沉积;富兴屯砾岩为河流—扇三角洲相沉积;龙井组为浅盆广湖相沉积,其中产有Ｎｉｇｅｒｅｓｔｈｅｒｉａｓｐ等化石,属早白垩世,与延吉盆地等有明显时代差异,具有穿时性。  相似文献   

    

Li Chongyin 《大气科学进展》1998,15(1):31-40

The data analyses found at first that the air—sea system in the northwestern Pacific region has clear systematical quasi—decadal oscillation, such as the surface air temperature, the subtropical high activities over the northwestern Pacific and the SSTA which has different time-scale features from the temporal variation with 3–4 years period of SSTA in the equatorial Pacific. In East Asia, the climate variations, such as the surface air temperature, the precipitation and the beginning date of Mei-yu in the Yangtze River basin, also have clear quasi-decadal oscillation. They can be regarded as the influences of quasi-decadal oscillation of air-sea system in the northwestern Pacific region. This research was supported by the Chinese Academy of Sciences and ‘95’ National Project- “Short-Range Climate Production System”.  相似文献   

全球热带SSTA与中国7月降水和气温的伴随相关型分析   总被引：1，自引：1，他引：0  

吴洪宝  段安民 《南京气象学院学报》1998,21(3):418-423

用伴随相关型（ＡＣＰ）分析了中国７月降水和气温与全球热带ＳＳＴＡ的ＰＯＰ（主振荡型）间的关系,得到当两个典型的传播ＰＯＰ处在Ｅ１Ｎｉｎｏ事件发展相位时中国夏季总体呈南北旱,中间涝的形势,其中江淮流域,华中,东北东部和西北大部为降水正距平,华北,华南为负距平,降水偏多（少）时相应的气温偏低（高）,当两个传播型的典型模态处于ＬａＮｉｎａ事件发展相位时情况则相反。  相似文献   

对流层高层偏北气流在梅雨暴雨中的作用   总被引：11，自引：0，他引：11  

翟国庆 《气象学报》1998,56(1):68-76

文中对江淮梅雨暴雨过程中的高低空流场特征及物理过程进行分析．结果表明：对流层上部青藏高原东侧常有高空偏北大风轴汇入南亚东风急流中．在这支强北风轴北端发现高空辐散和辐散的增长．亦即有利于低层辐合上升的持续、发展和加强;表明了低层西南急流与高空青藏高压东侧的偏北强风轴之间的次级环流圈,有利于梅雨暴雨的持续．  相似文献   

欧亚大陆桥(中国段)沿线气候特征与灾害区段划分研究     

余优森  陈榛妹  陈添宇 《气象学报》1998,56(2):178-186

分析研究了欧亚大陆桥（中国段）沿线的气候特征与地理环境,影响和阻碍铁路运输的气象灾害;作了气象灾害区段划分,并提出铁路安全运输的气象保障与服务。  相似文献   

NUMERICAL STUDY ON THE EFFECTS OF SEA SURFACE TEMPERATURE ON TROPICAL CYCLONE INTENSITY-PART I:NUMERICAL EXPERIMENT OF THE TROPICAL CYCLONE INTENSITY RELATED TO SST Duan Yihong;Qin Zenghao;Gu dianfeng;Li Yongping, Shanghai Typhoon Institute.Shangh     

端义宏  秦曾灏  顾建峰  李永平 《Acta Meteorologica Sinica》1998,(2)

In the context of a model of tropical cyclone intensity based on an improved meso-scaleatmospheric model, numerical simulation is performed of the track and intensity variation oftropical cyclones (TC) arising from sea surface temperature (SST) variation over a specified searegion. Evidence suggests that the model is capable of modeling quite welt the track and intensityof TC: SST variation leads to an abrupt change in the cyclone intensity: the response of thecyclone to the abrupt SST change lasts 8—12 h.  相似文献   

NUMERICAL EXPERIMENT OF IMPACT OF SEA SURFACE TEMPERATURE IN SOUTH CHINA SEA AND WARM POOL/WEST PACIFIC ON EAST ASIAN SUMMER MONSOON   总被引：1，自引：0，他引：1  

陈隆勋  王予辉 《Acta Meteorologica Sinica》1998,(2)

By using the NCAR CCM1 model, we have designed six sensitive experiments, which areincreased and decreased SST (sea surface temperature) by 1℃ each in the SCS (South China Sea)and in the West Pacific warm pool, increased and decreased SST by 1℃ in the warm pool withincreased SST by 1℃ in the SCS. All experiments are integrated from April to July. Comparingwith the control experiment, we have analyzed the anomalies of the wind field at the upper andlower layers, the anomalies of the seasonal variability of the monsoon and precipitation for eachexperiment. In the result, we have found that the SST anomaly (SSTA) in the SCS greatly affectsthe seasonal variability of the SCS monsoon and precipitation in China, especially during the coldperiod of SST in the SCS. The impact of SSTA in the warm pool on SCS monsoon is also found.but is weak as compared to the effect of SST anomaly in the SCS. Besides, its impact on rainfall inChina is uncertain.  相似文献   

海温异常对热带内外环流相互作用影响的对比分析   总被引：5，自引：2，他引：3  

孙柏民  孙淑清 《大气科学》1998,22(1):83-96

运用ECMWF的风场和高度场及TBB资料,用相关方法对比分析了热带太平洋海温分布东冷西暖（1984～1985年冬季）和东暖西冷（1982～1983年冬季）两种不同背景下,热带西太平洋对流活动与中高纬环流在季内时间尺度下相互作用的特点。结果表明,不同的海温分布其对应的大尺度环流场包括Hadley和Walker环流的位置及强弱均有较大的差别。冬季热带西太平洋对流活动与热带外大气的季内相互作用过程也有明显差异。  相似文献   

华南晋宁期造山运动──地质年代学和地球化学制约   总被引：9，自引：0，他引：9       下载免费PDF全文

李献华 《地球物理学报》1998,41(Z1):184-194

综合了前人和作者最新的地质年代学和地球化学研究成果,对华南晚元古代晋宁期造山运动的演化提供了化学地球动力学制约晚元古代早期（0．97－1．0Ga）的皖南、赣东北和桂北蛇绿岩在元素地球化学上具有相似的岛弧特征,但它们的Nd同位素组成明显不同新获得的高精度结石U－Ph年龄资料表明,桂北地区的本洞、三防和元宝山等三个主要花岗岩岩体均形成于820-825Ma,排除了本区有中元古代晚期花岗岩的存在．扬子南缘中元古代到三叠纪各个时代地层中的泥质沉积岩的TDM在晚元古代早期从约1．8Ga急剧降低至约1．3Ga,反映了这个时期的沉积物源区有大量新生馒源物质的加入．根据研究资料,提出了华南和扬子块体晋宁期陆-弧-陆碰撞模式  相似文献   

Stress Responses to Rapid Temperature Changes of the Juvenile Sea Cucumber （Apostichopusjaponicus Selenka）   总被引：2，自引：0，他引：2  

DONG Yunwei JI Tingting DONG Shuanglin 《中国海洋大学学报(英文版)》2007,6(3):275-280

Activities of hexokinase （HK）, pyruvate kinase （PK）, superoxide dismutase （SOD） and catalase （CAT） and Hsp70 level were measured to evaluate the response of the commercially important sea cucumber （Apostichopus japonicus Selenka） to rapid temperature changes in laboratory. Animals were subjected to a higher temperature （from 10 to 20℃） （Tinc treatment） or to a lower temperature （from 20 to 10℃） （Tddec treatment） for 72 h. At 1, 3, 12, 24, 72 h of exposure, animals were removed and prepared for further analysis. Results showed that the effect of acute temperature changes on enzyme activities was significant. In Tinc treatment, activities of SOD and CAT increased immediately. The significant enhancement of SOD and CAT activities suggested that oxidative stress increases significantly when ambient temperature increasing from 10 to 20℃. The up-regulation of Flsp70 in Tinc and Tdec treatments indicated that Hsp70 was a bioindicator of thermal stress in the sea cucumber, and the expression pattern depended on the thermal treatment.  相似文献