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131.
132.
柴达木盆地自然伽玛曲线记录的古气候变化对太阳辐射响应关系的对比研究 总被引:3,自引:0,他引:3
采用柴达木盆地达参1井自然伽玛(GR)曲线,建立了2 85MaBP以来的轨道调谐时标.对GR曲线、深海记录和黄土记录与太阳辐射曲线时频域的多维谱分析及奇异谱分析结果表明:达参1井GR曲线相对于太阳辐射的滞后时间短于深海及黄土记录3~4ka,GR曲线记录的岁差周期成分更为显著,且与太阳辐射在岁差周期上显示了更强的相关性.表明盆地古气候演化受到太阳辐射岁差周期强烈影响,具有低纬陆地记录的特征,而与深海记录和黄土记录受轨道倾斜周期和全球冰量变化的重要影响有别. 相似文献
133.
Strontium, neodymium isotopic compositions and trace elements of the detrital sediments of Core NS90-103 from South China
Sea were analyzed. The results show that the87Sr/86Sr ratios of the detritus during the last glacial range from 0.722 4 to 0.723 0. They are significantly higher than those
during the Holocene and the maximum of the last interglacial, which range from 0.721 0 to 0.721 7. This indicates stronger
continental weathering during the last glacial. On the other hand, the143Nd/144Nd ratios of these detritus are higher during the last glacial too, similar to the variation of the87Sr/86Sr ratios. The trace element geochemistry of these detritus indicates that more authigenic sediments, such as ferromanganese,
during the last glacial may partly contribute to the increase of143Nd/144Nd ratios. Furthermore, much more detritus from continent of South China to the north of the South China Sea may probably
contribute to143Nd/144Nd ratios increase during the last glacial, which was the result of the enhancement of northeast monsoon. 相似文献
134.
Using a recently developed global vegetation distribution, topography, and shorelines for the Early Eocene in conjunction with the Genesis version 2.0 climate model, we investigate the influences that these new boundary conditions have on global climate. Global mean climate changes little in response to the subtle changes we made; differences in mean annual and seasonal surface temperatures over northern and southern hemispheric land, respectively, are on the order of 0.5°C. In contrast, and perhaps more importantly, continental scale climate exhibits significant responses. Increased peak elevations and topographic detail result in larger amplitude planetary 4 mm/day and decreases by 7–9 mm/day in the proto Himalayan region. Surface temperatures change by up to 18°C as a direct result of elevation modifications. Increased leaf area index (LAI), as a result of altered vegetation distributions, reduces temperatures by up to 6°C. Decreasing the size of the Mississippi embayment decreases inland precipitation by 1–2 mm/day. These climate responses to increased accuracy in boundary conditions indicate that “improved” boundary conditions may play an important role in producing modeled paleoclimates that approach the proxy data more closely. 相似文献
135.
Geoffrey Lemdahl 《Journal of Paleolimnology》2000,23(1):57-66
Thirty-six Coleoptera (beetle) taxa and other insects were identified from the late-glacial and early-Holocene sediments at Kråkenes Lake. Compared with other Scandinavian late-glacial sites, this is a rather sparse record. The water beetles found in the Allerod are characteristic of a poorly vegetated clear-water lake. The terrestrial fauna is indicative of dwarf-shrub and moss vegetation. A marked decline in the number of species at the start of the Younger Dryas was rather rapid, probably over less than 80 calendar yrs. No obligate tundra species replaced the Allerod fauna. Most of the Younger Dryas is virtually devoid of beetles. The increase in numbers and diversity of both aquatic and terrestrial species at the Younger Dryas/Holocene transition is very rapid. After an initial pioneer stage, beetles associated with dwarf-shrub heath and willow scrub appeared, but no obligate tree or forest taxa were recorded.Mutual Climatic Range (MCR) temperature reconstructions suggest that the Allerod was colder and more continental than present. The near absence of beetles in the Younger Dryas probably reflects very cold conditions. A rapid temperature rise at the start of the Holocene resulted in a warmer and more continental climate than present. 相似文献
136.
Rhawn F. Denniston Luis A. Gonzalez Holmes A. Semken Jr. Yemane Asmerom Richard G. Baker Heather Recelli-Snyder Mark K. Reagan E. Arthur Bettis III 《Quaternary Research》1999,52(3):381
Speleothem carbon and oxygen isotopic records from Onondaga Cave, south-central Missouri, and Beckham Creek Cave, north-central Arkansas, are compared with the Cupola Pond and Oldfield Swamp pollen series from southeastern Missouri and the Rodgers Shelter and Modoc Shelter vertebrate biostratigraphic sequences from central Missouri and southwestern Illinois. Similar, and roughly contemporaneous, shifts between deciduous forest and steppe indicators throughout the Holocene are revealed in each database. These independent proxies record steppe conditions between approximately 9000 and 1500 cal yr B.P. A shift toward lighter speleothem carbon may reflect a change from warm and dry to cool and dry conditions between 4500 and 3000 yr B.P. The sensitive response of speleothem δ13C to changes in vegetation emphasizes their importance as paleoclimate records in an area containing few other millenial-scale climate proxies. 相似文献
137.
内蒙岱海湖岩芯碳酸盐含量变化与气候环境演化 总被引:4,自引:0,他引:4
内蒙岱海是位于东南季风区的西北边缘的内陆封闭湖泊,对气候变化十分敏感。本文根据对岱海湖泊岩芯的碳酸盐含量分析,结合湖泊沉积岩性特征、介形类化石以及其年代学研究,初步讨论了岱海距今近千年的气候环境演化过程,结果表明:930aBP—670aBP气候以温湿为主,670aBP—540aBP,气候以冷偏湿为主;540aBp—490aB.P.湖泊急剧退缩,以冷偏干气候为主;490aBp—270aBP以凉干气候为主;270aBP-150温干气候;150年以来,湖区有效降水有所增加的温偏湿气候为主。 相似文献
138.
末次冰期晚期以来地层序列与地质环境特征——渤海南部地区沉积序列研究 总被引:1,自引:0,他引:1
就渤海南部末次冰期晚期以来的地层序列与地质环境演化特征,将研究区划分出4个沉积环境区,分别选择4个典型钻孔(ZK101,ZK228,C305,Y86)进行了对比研究。选用27个钻孔联成282km长的地层剖面,剖面明显反应出郯庐断裂带挽近的运动及现代黄河三角洲体的均衡作用。同时,分析了本区全新世气候及海侵边界层 相似文献
139.
The Padul-15-05 sediment core provides an exceptional perspective of the paleoenvironmental and climate change in the Western Mediterranean region for the last ca. 200 kyr. However, even though a robust chronology mainly relying on radiometric dating is available for the last 50 ka, the chronology for the older sediments is not yet fully resolved. Ages for the bottom part of the core (>21 m) were previously inferred from amino-acid racemization dating and sediment accumulation rates. In this work, we provide a more accurate chronology for the older part (>100 kyr) of the Padul-15-05 sediment core record based on the recognition of past Earth's magnetic excursions. We identify an interval prone of reversed polarity samples close to MIS-5e/5 d transition that we correlate to the Blake geomagnetic excursion (116.5 kyr–112 kyr). In addition, we identify an interval of low inclinations and two reversed samples that we interpret as the Iceland Basin geomagnetic excursion (192.7 kyr–187.7 kyr: wide scenario of VGP <40°). Our new results, which include IRM acquisition curves that contribute to understand the magnetic mineralogy, enhances the robustness of the age model for the Padul-15-05 sedimentary sequence by adding an independent age dataset with new accurate tie-points. Our refined age control together with the available paleoenvironmental and paleoclimate multiproxy data provide insightful information to unveil the response of the western Mediterranean environments to regional environmental and climate change. 相似文献
140.
白令海北部陆坡B2 9柱状样中放射虫Cycladophoradavisiana含量曲线和深海SPECMAP氧同位素记录的对比 ,为该柱状样建立了晚第四纪约 1 0万年以来的地层年代框架。该柱状样中微体化石、碳屑颗粒、筏冰碎屑 (石英和岩屑颗粒 )的定量分析结果表明 ,作为表层生产力指标的粗组份自氧同位素 5 .3期以来呈阶梯状增加 ,反映表层生产力阶段式的增长 ;碳屑颗粒丰度自氧同位素 5 .3期至末次冰消期的增加说明白令海末次冰消期以前气候较全新世干冷 ,天然火灾发生的概率较全新世大大增加 ;冰期和早、中全新世较高的筏冰碎屑反映了冰期和早、中全新世白令海陆架海冰的扩大以及气候转暖所导致的海冰消融的过程 ,揭示了白令海对过去全球气候变化的响应。 相似文献