西藏羌塘北部地区晚二叠世地层再研究

西藏羌塘北部晚二叠世地层,主要分布在双湖办事处-热觉茶卡一带,称为“热觉茶卡组”,其下部为深灰色、灰绿色粉细砂岩、粉砂质页岩、夹生物碎屑灰岩、含竹蜓类、腕足类等化石;上部为黄灰色砂岩夹炭质粉砂岩、泥岩和多层煤层,含植物化石。上、下两部分之间为断层接触。根据1/25万玛依岗日幅区域地质调查的最新资料,其上部产大羽羊齿植物化石的陆相碎屑岩沉积与下部产竹蜓类动物化石的海相沉积,二者为连续沉积。通过古生物化石的研究与岩石地层学分析,将原热觉茶卡组拆分为两个组,保留下部含有竹蜓类等化石海相沉积为主的热觉茶卡组,将上部含植物化石的地层建立一新的岩石地层单位—黑土沟组,代号P3h。     

考虑地形运动学边界条件的斜压大气发展倾向计算

本文讨论在大范围高空温压场的斜压发展短期数值预报中考虑地形运动学边界条件的具体方法,并用张弛法计算了二个实例的高度倾向.计算结果说明在天山阿尔泰山一带地形变高在700mb 上可以大到70—80米/24小时,下层更大,是需要考虑的.但是由于地面风决定的困难,还需要考虑改进模式,在高速电子数学计算机上大量试验,才能在日常预报中使用.     

云南西部发现古鉀鹽矿層

为滿足农业对旷物肥料的要求,一九六二年我們在云南西部开展了鉀盐普查工作,按照就矿找矿的原則,根据已知盐泉和生产矿硐,运用水化学和岩盐取样等方法寻找钾盐。經过初步工作認为,并在一个矿区找到了古鉀盐层。含盐带是有远景的。已知钾盐矿点,处于两个褶皺隆起山脉间的断陷盆地中。此区自华力西运动末期已具盆地的雛     

数值天气预报的现状和2000年展望

一、我国现有水平、与国外先进水平的差距和解决的途径1.我国现有水平近年来,我国用五层北半球原始方程差分模式和正压准地转模式进行过短期预报和月预报的大量试验研究。在五层北半球原始方程差分模式中,考虑了地形、辐射、大尺度凝结、地表摩擦和水汽、感热交换等。它于1981年1月投入业务。其1982年24小时预报检验情况如表1所示。从天气形势来看西风带大尺度流型演变预报有参考价值,但系统移速偏慢,在中纬度,48小时预报要慢5个经度。但低纬度预报则一般较差。     

IMPACT OF THE HEATINC OVER SOUTH ASIA UPON THE SUBTROPICAL HIGH OVER WEST-PACIFIC

A case is reported, during which the Subtropical High over the Western Pacific(hereafter, SHWP in abbreviation)shifted northwestward and met-yu at Chaniiang River valley ended. Several numerical experiments on SHWP activity influenced by the heating over south Asia monsoon area are carried out, and the statistic significance of the results is checked. The results indicate that the enhancement of positive heating over South Asia will motivate a wave-like series of anomaly centers, which propagate northeastward from the maximum heating center.so that a strong positive potential height anomaly center will set up from North China to Japan at Day 3 result in the enhancement of SHWP. Comparison of the influence upon SHWP by the heating over south Asia monsoonarea with that over ITCZ area south to SHWP is also carried out. It is pointed out that the heating over South Asiamonsoon area tends to favor SHWP northward movement while the heating over ITCZ area tends to thvor SHWP westward stretching. As for the time to begin to influence on SHWP, the heating over south Asia monsoon areafavors the enhancement of SHWP atter Day 3 while that over ITCZ south to SHWP effects after Day 5.     

NUMERICAL EXPERIMENT OF MEDIUM-RANGE CHANGE OF THE SUBTROPICAL HIGH Ⅱ. THE INFLUENCE OF THE HEATING SOURCE OVER WESTERN TROPICAL PACIFIC

Numerical experiments are carried out using a global spectral model to study the role of an ideal heating source over the western tropical Pacific region in a medium-term weather process that marks the western advancement of the subtropical high in mid-June 1979. The result has indicated that the effect of the ideal heating source is evident in about 4 days after the inclusion in the high and the circulation at mid-and high-latitudes over the eastern part of China; the disturbance produced over the tropical ocean first transfers towards the northwest along the easterly flow on the southern edge of the subtropical high and then divides into two branches as it moves over the westerly over the mid-latitude area, one continuing the journey northwestward and the other turning to the northeast by east, resulting in changes in the subtropical high and the westerly through combined action.     

亚洲夏季风活动激发北半球大气遥相关的物理机制探讨 II.最优强迫模及其响应

利用最近发展的完备正规强迫模的动力学方法,对亚洲夏季风活动激发北半球大气遥相关的外部物理机制进行了探讨。结果表明,北半球夏季亚洲季风区是外强迫最敏感区域之一,最优强迫模与亚洲季风区季内时间尺度对流活动的结构特征相似,而且北半球大气对最优强迫模的响应与滞后于强季风候的环流异常型结构一致,由此可以认为,亚洲夏季风活动造成的热状况变化也是导致北半球大气遥相关的重要物理原因。     

阿克陶M_S6.7地震前帕米尔东北缘地形变特征的GPS研究

利用2009～2015年4期GPS观测资料,获得阿克陶M_S6. 7地震前震中附近区域水平运动速率、主应变率、面膨胀率及最大剪应变率,结合区域构造背景分析该区域变形动态特征,结果表明:(1)本次地震震前研究区速度场由南向北逐渐减弱,研究区南部帕米尔区域整体运动速率高于北部的南天山区域,以发震构造为界南北部区域的速率大小和方向均有差异。(2)研究区现今应变率场与该区域长期的地质构造背景相一致,震前逐渐增强的压应变为本次地震提供发震背景。研究区剪应变变化趋势优于面膨胀变化趋势。     

与非线性区域预测方法结合的月延伸预报试验Ⅰ:纬向平均环流的预报

为克服数值模式普遍存在的纬向平均环流预报误差,文中在36a NCEP/NCAR再分析高度场资料的基础上,应用非线性时空序列预测理论的局域近似法构建了200,300,500和700hPa4个等压面上的月尺度逐候纬向平均高度距平场非线性动力学区域预报模型.对1996年12个月所做的预报试验表明,无论是南、北半球中高纬度地区还是低纬度地区,非线性模型的候纬向平均高度预报结果均优于持续性预报、气候预报和T42L9模式动力预报.用非线性结果对T42L9模式月平均高度场预报结果进行订正,则使该谱模式系统性预报误差显著减少,也大大减少了其预报高度场的均方根误差,相应地,高度场距平相关评分也有一定程度的提高,表明纬向平均高度的非线性预报比谱模式动力预报包含了更多的有用信息.