基于红外窗区与水汽通道对流云团识别方法研究

卫星观测与辐射传输分析证明,对流云团红外水汽与窗区亮温差(brightness temperature difference,BTD)具有显著特征,利用对流云团BTD红外亮温特征可以识别对流云团。基于对流云团BTD特征建立的全球对流识别系统(global convection diagnostic,GCD)算法通过设立一个BTD单阈值检测对流云团的有无,但是它不能进一步量化对流云团强度。本文利用FY-2GVISSR红外观测数据与CINRAD CAR(CAPPI of reflectivity)雷达观测数据进行对比研究,结果表明:BTD/CAR具有较好线性正相关关系;BTD不仅可以用于识别对流云团的存在,还可以进一步量化对流云团强度;BTD作为对流云团识别因子优于IRW(infrared window)亮温法。基于BTD/CAR相关关系可以实现基于静止卫星红外水汽和窗区观测的对流云团识别与定强。     

Bifurcations and catastrophes in a nonlinear dynamical model of the western Pacific subtropical high ridge line index and its evolution mechanism

Despite much previous effort, the establishment of an accurate model of the western Pacific subtropical high (WPSH) and analysis of its chaotic behavior has proved to be difficult. Based on a phase-space technique, a nonlinear dynamical model of the WPSH ridge line and summer monsoon factors is constructed here from 50 years of data. Using a genetic algorithm, model inversion and parameter optimization are performed. The Lyapunov spectrum, phase portraits, time history, and Poincaré surface of section of the model are analyzed and an initial-value sensitivity test is performed, showing that the model and data have similar phase portraits and that the model is robust. Based on equilibrium stability criteria, four types of equilibria of the model are analyzed. Bifurcations and catastrophes of the equilibria are studied and related to the physical mechanism and actual weather phenomena. The results show that the onset and enhancement of the Somali low-level jet and the latent heat flux of the Indian monsoon are among the most important reasons for the appearance and maintenance of the double-ridge phenomenon. Violent breakout and enhancement of the Mascarene cold high will cause the WPSH to jump northward, resulting in the “empty plum” phenomenon. In the context of bifurcation and catastrophe in the dynamical system, the influence of the factors considered here on the WPSH has theoretical and practical significance. This work also opens the way to new lines of research on the interaction between the WPSH and the summer monsoon system.

     

关于平果铝矿生产勘探问题的研究

岩溶堆积型铝土矿是国内新类型的铝土矿床,文章探讨该类型矿床的勘探类型,研究合理勘探网度,将地质勘探与生产勘探资料进行对比分析,简介生产勘探中一些成功经验     

青藏高原自然植被总生物量的估算与净初级生产量的潜在分布*

以800多块样地资料及森林和草地资源调查数据为基础,按县级为单位估算了青海和西藏两省区的自然植被总生物量,分别为2.586×10⁸t和1.282×10⁹t.建立的QZNPP模型显示,随着温度的增加,生物生产量呈S型曲面递增,且其递增速率随降水量增加而加快;当年均温度0℃～10℃和年降水量400mm～1000mm时,生物生产量增长最快;当年均温度>11℃和年降水量>1 100mm时,生物生产量趋向于20t/hm²·a;在年均温度<0℃时,相对降水量的增加,生物生产量呈缓慢的递减趋势,说明这时温度是影响生物生产量的主导因子。两省区115个县的生物量现实分布图显示,生物量最高值出现在西藏墨脱,其次是西藏的察隅、波密、林芝和米林,青藏高原中部及西北部的广阔地区最低。青藏高原自然植被净初级生产量最小值为0,最大值为20t/hm²·a,全区平均为6.03t/hm²·a,低于世界陆地植被的平均水平     

山东大山地震台避雷器简介

介绍了一种适合于地震台站地震仪器使用的避雷器,叙述了其工作原理,安装方法,指出因其造价低廉、安装简单、安全可靠,可保证地震仪器的正常运转。     

山东乳山三甲金矿床的叠加晕模式

１９８７年,研究了三甲金矿床－２６ｍ标高以上矿体原生晕特点,预测深部还有盲矿,后被钻探证实。１９９５年,又研究了－２６６ｍ标高以上矿体原生叠加晕特点,建立了矿床叠加晕模式,预测深部还有盲矿,验证已见矿。     

富水水库温度分层的调查研究

该文系1985年7月至1986年5月对富水水库温度分层现象调查资料的研究,着重分析了夏秋分层期温跃层及其相应的溶氧量和酸碱度的变动情况。     

“互联网+”时代下地理信息应用模式

针对"互联网+"下地理信息应用创新的问题,提出构建以互联网为中心和以地理信息共建共享为常态的应用模式。研究以地理信息应用为主线,对各时期的数据来源、特征、产品、应用目的及受众人群进行了比较分析,理清应用各部分的关系。结合"互联网+"的内涵及主要特点,提出地理信息应用方面的创新,构建以互联网为中心的服务体系,实现地理与传统行业的跨界融合,推进地理信息共建共享。     

川东南小麦生育期农业气候资源分析

本文揭示了川东南地区小麦生育期间光、热、水等农业气候资源特点,分布和变化规律,及其对小麦生长发育和产量形成的影响。     

A contribution to physicochemical conditions for the formation of syngenetic sulfide ores

The results of thermodynamic calculations demonstrate that the pH and Eh values for bottom sea water enriched in organic matter tend to decrease drastically as a result of bacterial reduction of sulfates in sea water. Syngenetic sulfide ore beds associated with the Jiashengpan strata-bound Pb-Zn-S ore deposit are believed to have been precipitated under the conditions of pH varying from 7.08 to 7.17 and Eh from −0.232 to −0.418V. It is established that in the reducing system in sea water where reduction of sulfates by anaerobic bacteria took place, paleosalinity is an important factor affecting pH and Eh changes and controlling the formation of sulfide ore beds. The present study shows that the quantitative evaluation of physicochemical conditions can be effected from thermodynamic calculations on the basis of geochemical data.