南极海冰变化异常与全球海平面变化(英)   总被引：1，自引：0，他引：1  

XIE Si-Mei  ZOU Bin  WANG Yi  BAO Cheng-Lan 《冰川冻土》1998,(4)

In this paper, the long-term variation trend of the Antarctic sea ice in 1973～1994 and the inter-decade variation rule of the global sea level are analyzed. It is foundthat, the Antarctic sea ice area in 1980's was significantly less than in 1970's but with regional difference:decreasing in Regions Ⅰ, Ⅱ, and Ⅲ, and increasing in Region Ⅳ, the average global sea levelheightvalue in 1980's was also significantly higher than in 1970's but also with very large regional difference.Connecting variation of both to analyze their physical mechanism, it is pointed that, the accumulated seaice anomaly value in 1980's less than in 1970's means a global climate warming, the sea watertemperature and air temperature rising, sea water volume expanding, and more icebergs transportingfrom the ice cover on the Antarctic continent to ocean in the warmer years. As a result, the global sealevel raised significantly with the global average sea level value in 1980's was 22 mm higher than in 1970's. The Sea Level Raising (SLR) distributed uneven. It is especially true in the Pacific Ocean andAtlantic. This kind of uneven SLR distribution closely relates to, or is introduced by the uneven sea ice change of the Antarctic Regions.  相似文献   

气候系统内极区热汇与热带海洋热源之间的相互作用(英)   总被引：2，自引：1，他引：1  

XIE Si-Mei  BAO Cheng-Lan  HAO Chun-Jiang 《冰川冻土》1998,(4)

The anomalous change of two polar sea ice and tropical ocean SST is a very important index for global climate monitoring and prediction. In this paper, the wave resonance principle is used to calculate month by month running cross couple correlation coefficient time series between sea ice in different sea area of two Polars, as well as between them and five elements of E1 Nino events, to analyze their variation features, and to find out their resonance periods. The resonance period of two waves is just the strongest interaction period.Some results are concluded as follows. 1) The Arctic sea ice to the Pacific-side (NPI1) and Atlantic-side (NP12) show a strong positive-negative feedback impact each other to the Antarctic Ross Sea ice (SPI2) with equal intensity. 2) Both NPI1 and NPI2 give a strong positive and negative feedback to the Antarctic Wedded Sea ice (SPI3) while it is rather weak in convercse status. It means that, the Arctic sea ice plays a leading and controlling role on the Wedded Sea ice. 3) SST of Nino 4 area in thecentral equatorial Pacific has a best resonance period with SPI2 with cycle period of 132 months. It closely relates to quasi-11 years oscillation period of both SST of Nino 4 area and SPI2. SST of Nino 4 has also a resonance period to SPI3 with cycle of 61 months. There also exist strong interaction periods between the Antarctic sea ice and other elements of ENSO event but weaker than SST of Nino 4 area.  相似文献   

西太平洋暖池基本特征及其对气候的影响   总被引：15，自引：0，他引：15  

李克让  周春平 《地理学报》1998,53(6):511-519

本文在大洋暖区物理气候图集编制以及大洋暖池指数建立的基础上,重点分析研究了西太平洋暖池区的基本特征;大洋暖池指数的建立及暖池气候特征;西太平洋暖池与西太平洋副热带高压的关系;西太平洋暖池与厄尔尼诺的关系。  相似文献   

Surface potential and gravity changes due to internal dislocations in a spherical earth—II. Application to a finite fault     

Wenke Sun  & Shuhei Okubo 《Geophysical Journal International》1998,132(1):79-88

  相似文献   

新疆气候与环境的过去,现在及未来情景   总被引：9，自引：2，他引：7  

姜逢清  胡汝骥 《干旱区地理》1998,21(1):1-9

在分析近年来新疆地质时期与历史时期气候与环境研究方面大量的文献资料与成果,并对现代器测时期的气候变化问题进行讨论的基础上,利用综合分析法构画了新疆下世纪上半叶气候与环境的可能情景,认为新疆气候与环境初期于的晚白垩世,主要形成于第三三纪,至今总的干旱情并未改变。  相似文献   

云南三江并流地区气候变化及其对生态环境的影响   总被引：4，自引：1，他引：4  

郭菊馨  王自英  白波  鲁亚斌 《云南地理环境研究》2006,18(2):48-52

利用EOF等方法通过计算1971-2000年30年来云南三江并流地区6个气象台站气温、降水、蒸发资料，分析了云南三江并流地区近30年来气候变化的异常特征及其对生态环境的影响，结果表明：云南三江并流地区气候变化表现为气温升高、降水略有减少和蒸发增大的干旱化气候变化趋势，同时，在气候干旱化和人为活动的影响下出现草场退化、冰川萎缩、雪线上升、土壤沙化和水土流失等生态环境荒漠化问题。  相似文献   

渤海湾盆地早第三纪水平面升降和全球海平面升降的不一致性   总被引：4，自引：0，他引：4  

李守军 《地质论评》1998,44(1):31-34

本文通过对渤海湾盆地下第三系中半咸水化石纵向分布特点研究,并根据新的地层划分方案,利用古生物－岩相综合分析方法绘制了该地区早第三纪水平面升降曲线,发现半咸水生物出现在水进初期,在最大水进期消失,水平面升降曲线一全球海平面升降曲线无直接关系,即水平面的上升示受海平面上升的影响,从而证明此阶段无海侵发生,非海侵观点对于总结我国陆相地层的油气勘探理论及实践具有重要意义。  相似文献   

Ice-core records of global climate and environment changes     

Robert J. Delmas 《Journal of Earth System Science》1998,107(4):307-319

Precipitation accumulating on the Greenland and Antarctic ice sheets records several key parameters (temperature, accumulation, composition of atmospheric gases and aerosols) of primary interest for documenting the past global environment over recent climatic cycles and the chemistry of the preindustrial atmosphere. Several deep ice cores from Antarctica and Greenland have been studied over the last fifteen years. In both hemispheres, temperature records (based on stable isotope measurements in water) show the succession of glacial and interglacial periods. However, detailed features of the climatic stages are not identical in Antarctica and in Greenland. A tight link between global climate and greenhouse gas concentrations was discovered, CO₂ and CH₄ concentrations being lower in glacial conditions by about 80 and 0.3 ppmv, respectively, with respect to their pre-industrial levels of 280 and 0.65 ppmv. Coldest stages are also characterized by higher sea-salt and crustal aerosol concentrations. In Greenland, contrary to Antarctica, ice-age ice is alkaline. Gas-derived aerosol (in particular, sulfate) concentrations are generally higher for glacial periods, but not similar in both the hemispheres. Marine and continental biomass-related species are significant in Antarctica and Greenland ice, respectively. Finally, the growing impact of anthropogenic activities on the atmospheric composition is well recorded in both polar regions for long-lived compounds (in particular greenhouse gases), but mostly in Greenland for short-lived pollutants.  相似文献   

The Loess in the Qinling Mountains and Its Records of Palaeoenvironmental Changes     

LEI Xiangyi  YUE LepingLoess Research Section  Department of Geology  Northwest University  Xi'' an  Shaanxi 《《地质学报》英文版》1998,72(4):420-431

The Fengzhou loess section is very typical in the Qinling Mountains. The section, which is about 82 m thick and underlain by Neogene red clays, consists of 33 layers of loess and 33 layers of palaeosol. It covers the Brunhes normal polarity zone and Matuyama reversed polarity zone, and the B/ M boundary is located in the middle part of loess layer 8 (L8). The loess of the Matuyama reversed polarity zone records the Jaramillo, Olduvai and Reunion normal polarity subchrons. The boundary between the Matuyama reversed polarity zone and Gauss normal polarity zone (M / Ga) appears on the lithological boundary between loess and Neogene red clays. Loess accumulation in the Fengzhou section started before 2.48 Ma B.P. Based on the stratigraphical structure, the material composition and magnetic susceptibility curve of the Fengzhou loess section, the palaeoclimatic changes during the last 2.48 Ma in the Qinling Mountains are subdivided into 66 cold-dry and warm-humid stages, equivalent to 33 climatic cycles. The  相似文献   

云贵高原湖泊沉积物碳酸盐和有机质的同位素组成及环境信息记录   总被引：1，自引：0，他引：1  

肖保华 《矿物岩石地球化学通报》1998,(1)

云贵高原湖泊沉积物碳酸盐和有机质的同位素组成及环境信息记录＠肖保华￥中国科学院地球化学研究所高原湖泊,碳酸盐,有机质,碳同位素,地球化学记录,环境气候信息云贵高原湖泊沉积物碳酸盐和有机质的同位素组成及环境信息记录肖保华（中国科学院地球化学研究所,贵阳５５０...  相似文献