江南持续阴雨 秋收秋播受阻 东部地区大雾 交通受到影响     

Ye Dianxiu 《气象》2001,27(2)

11月份，全国大部地区气温偏低，部分地区偏低幅度较大。月内降 水过程较频繁且分布不均，北疆、青海大部、长江下游等地区降水明显偏多，北疆出现雪灾 ，尤其长江下游地区持续出现连阴雨天气，给当地秋收秋播及秋播作物幼苗生长造成一定影 响。华北、黄淮等地出现大雾天气，给人们出行、交通运输等带来不便。 1　大部气温偏低，气温变幅大 　　月内气温变幅较大。上旬和中旬，全国大部地区气温偏低，尤其中旬气温偏低幅度大，达3 ～5℃；下旬，除北疆、东北大部气温偏低较明显外，全国其余大部及南疆南部、云南大部 正常或稍偏高外，全国其余大部地区气温偏低，其中东北地区、华北北部、江南西部及北疆 、河南西部和南部、广西东北部等地偏低2～4℃。月内，黄淮南部、江淮、江南北部及陕南 、贵州等地相继出现了初霜冻，大部地区初霜冻日期比常年偏早3～11天。由于热量条件较 差，北方冬小麦生长分蘖、形成壮苗及南方秋播作物幼苗生长受到不良影响，但低温能在一 定程度上抑制病虫越冬。  相似文献   

20世纪全球增暖最显著的区域   总被引：6，自引：0，他引：6  

Zeng Zhaomei  Yan Zhongwei  Ye Duzheng 《大气科学进展》2001,18(4):481-496

Having analyzed a global grid temperature anomaly data set and some sea level pressure data during the last century, we found the following facts. Firstly, the annual temperature change with a warming trend of about 0.6℃/100 years in the tropical area over Indian to the western Pacific Oceans was most closely correlated to the global mean change. Therefore, the temperature change in this area might serve as an indicator of global mean change at annual and longer time scales. Secondly, a cooling of about -0.3℃ / 100 years occurred over the northern Atlantic. Thirdly, a two-wave pattern of temperature change, warming over northern Asia and northwestern America and cooling over the northern Atlantic and the northern Pacific, occurred during the last half century linked to strengthening westerlies over the northern Atlantic and the weakening Siberian High. Fourthly, a remarkable seasonal difference occurred over the Eurasian continent, with cooling (warming) in winter (summer) during 1896-1945, and warming (cooling) in winter (summer) during 1946-1995. The corresponding variations of the North Atlantic Oscillation and the Southern Oscillation were also discussed.  相似文献   

Evaluation of Petroleum System in Xihu Depression, East China Sea Shelf Basin     

Lü Delin 《中国地质大学学报(英文版)》2001,12(4)

Since Dow (l972) proposed the concept of oil system atthe AAPG annual meeting in l972, after unremitting effol.tsand progressive perfection, it has become the petroleum systemaccepted by numerous geologists at present. The concept of pe-troleum system was introduced to our country in early l990s(I)ou, l999). In fact, as early as the 1960s, based on the hy-drocarbon exploration and development practice at Songliao ba-sin and Bohai Bay basin, some viewpoints similar to petroleumsystem have be…  相似文献   

利用计算机实现综合解译圈定找矿靶区     

叶水盛  纪瑛瑛  朱政嘉  余生晨 《吉林大学学报(地球科学版)》1997,(2)

主要论述用计算机代替手工实现综合解译的过程。该过程归纳为：从专业领域获取知识组织成专业模型，再将其转变翻译成知识模型，然后转移到计算机内实现推理目标。重点论述从专业模型到知识模型的过渡和推理目标的实现。通过在河北、山西的实践，证明用计算机综合解释圈定找矿靶区是可行的  相似文献   

Crustal structure along the EDGE transect beneath the Kodiak shelf off Alaska derived from OBH seismic refraction data   总被引：4，自引：0，他引：4  

S. Ye  E. R. Flueh  D. Klaeschen  R. von  Huene 《Geophysical Journal International》1997,130(2):283-302

  相似文献   

成都地磁台的观测与评估     

叶富华  江道崇 《四川地震》1997,(3)

通过对成都地磁台的仪器配置、误差来源、资料质量等方面进行综合分析，结果表明．成都地磁台的观测质量稳定，资料连续可靠。成都地磁台的观测能够正确反映成都地区地磁场的变化特征。  相似文献   

Short-term　and　imminent　anomalies　of　earthquake　of　load　and　unload　response　ratio　of　the　well　level　to　earth　tides     

张昭栋  陈学忠  吴子泉  王梅  程烨  苏鸾声  王忠民  石荣会 《地震学报(英文版)》1997,10(2):217-225

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鲁东-苏北榴辉岩的构造特征及其折返机制     

王清晨  张儒瑷  从柏林  赵中岩  叶凯 《岩石学报》1992,8(2):153-160,T001

鲁东-苏北地区出露了M型和Q型两类榴辉岩,前者的原岩为地幔岩类,后者的原岩为地壳岩类。它们均呈外来岩块产出于片麻岩中。其形成经历了前榴辉岩I、A和S阶段,在I和A阶段它们表现为韧性变形,而在S阶段则表现为碎裂变形。它们的折返过程经历了剪切回流和区域性隆起剥蚀。  相似文献   

夏季青藏高原热力场和环流场的诊断分析——Ⅱ:环流场的主要特征及其大型垂直环流场   总被引：8，自引：0，他引：8  

杨伟愚  叶笃正  吴国雄 《大气科学》1992,(3)

本文使用经过青藏高原气象科学实验测站观测资料订正过的欧洲中心FGGE-Ⅲb资料,对1979年7月月平均进行分析,计算了垂直速度、散度、垂直剖面函数和速度势函数等物理量以及上升气流轨迹,给出了夏季高原主体地区环流场的主要特征和详细的高原地区不同经纬度剖面垂直环流场的特征和分布. 配合夏季高原高层强大稳定的反气旋高压带,高原主体地区为整层上升气流区,但ω场有东西两个上升中心,它们是两个对流活动上升中心,两部的中心位于狮泉河和改则之间偏北的地区,东部的位于那曲一带. 本文给出了高原地区三个主要的经向环流圈(南北两侧下沉的小环流圈、跨赤道的季风环流圈)的经度位置和高原地区与西太平洋之间发生遥相关的主要纬度位置,发现在跨赤道的季风环流圈中,在赤道以南的下沉气流主要来自高原与15°N之间,从高原上升的气流仅在对流层上部(200hPa左右)跨过赤道.从高原西部上升的气流往往从非洲至印度尼西亚一带跨过赤道,而从高原东部及其东侧我国大陆上升的气流往往下沉在太平洋和北大西洋地区.  相似文献   

Climatic jumps in the flood/drought historical chronology of central China   总被引：2，自引：0，他引：2  

Yan Zhongwei  Ye Duzheng  Wang Cun 《Climate Dynamics》1992,6(3-4):153-160

Statistical series of flood/drought (F/D) grades and F/D variabilities were derived for the flood and drought chronology (2700 bc-1980 AD) of central China. Two types of climatic jumps were analyzed. The moving sign-test, T-test and F-test were applied to detect jump signals. A few wet-to-dry jumps for time-scales from decades to thousand years were compared with relevant climatic changes in other regions of the world. Changes in the annual rainfall due to jumps were estimated. Some F/D-deficient-to-F/D-frequent jumps were also found and their significance is discussed.Contribution to Clima Locarno — Past and Present Climate Dynamics; Conference September 1990, Swiss Academy of Sciences — National Climate Program  相似文献