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69篇 您的检索式:作者名="Negendank"
    题名 作者 年代 出处 被引量
1湖光岩玛珥湖全新世气候波动的周期性显示文摘对全新世以来湖光岩玛珥湖沉积物干密度高分辨率(10~15a间距)时间序列的能谱分析和滤波分析表明:气候变化存在明显的2930,1140,490, 250和 220a的主周期. 2 930 a周期所对应的3次降温期,其峰值分别发生在7300, 4250和1200 Cal aBP左右.1140a主周期变化,在全新世早期波动幅度最大,到中、晚全新世其幅度逐渐减小,所对应的明显的降温期有7~8次.全新世千年尺度的气候变化,有可能是通过岁差周期(23 070 a)的谐波周期对全球水循环的调整,驱动温盐环流强度的变化,进一步影响了全球气候变化.刘嘉麒 吕厚远 J. Negendank J. Mingram 骆祥君 王文远 储国强 2000科学通报2000,45,11:72
2The early Holocene optimum inferred from a high-resolution pollen record of Huguangyan Maar Lake in southern China显示文摘A high-resolution pollen record of the past 13000 a from Huguangyan Maar Lake reveals the vegetation and environment changes in southern China during the Holocene. It shows that (i) pollen percentage of trees and shrubs reached 56% during the early Holocene (11600―7800 cal a BP), of which the pollen percentage of tropical trees reached a maximum at 9500―8000 cal a BP, reflecting a hot and wet envi- ronment; (ii) during the mid-Holocene (7800―4200 cal a BP), the pollen percentage of montane conif- erous trees and herbs increased, while the percentage of tropical-subtropical trees decreased, indi- cating lower temperature and humidity; (iii) in the late Holocene spanning from 4200 to 350 cal a BP, the pollen percentage of herbs and montane conifer increased significantly, indicating a marked decrease of temperature and humidity. Our pollen data reveal that the time period 9500―8000 cal a BP in south- ern China represents a climatic optimum for the Holocene characterized by hot and wet conditions. This is consistent with the Holocene optimum found in lower latitude regions globally. We speculate that strong insolation might cause the northward migration of the ITCZ and subtropical summer mon- soon front, which resulted in an early Holocene optimum in the Huguangyan area. The dry tendency and climate fluctuations of the middle and late Holocene could be associated with a decrease in solar insolation and frequent ENSO event.WANG ShuYun LUE HouYuan LIU JiaQi Joerg F. W. NEGENDANK 2007Chinese Science Bulletin2007,52,20:36
3末次冰期以来湛江湖光岩玛珥湖孢粉记录及古环境变化显示文摘通过对湛江湖光岩玛珥湖钻孔孢粉记录的研究认为 ,末次冰期以来 ,该区植被类型从早期的南亚热带季风常绿阔叶林依次演替为 ,中亚热带常绿、落叶阔叶林→南亚热带季风常绿阔叶林→中亚热带常绿 落叶阔叶 针叶混交林 (湖边草地 )→热带季雨林→半常绿季雨林。气候最寒冷的时期温度比目前至少降低了 4— 6°C以上。全新世早期相对干旱。吕厚远 刘嘉麒 储国强 顾兆炎 Negendank J Schettler G Mingram J 2003古生物学报2003,42,2:39
462 kaBP以来湖光岩玛珥湖沉积物有机碳同位素记录及古气候环境意义显示文摘湖光岩玛珥湖HUG B孔岩心记录了62kaBP以来的古气候、古环境变化信息。全岩有机碳同位素组成(δ13CTOC)分析表明,62kaBP以来δ13CTOC值变化比较明显,其变化范围为-28.5‰~-15.5‰。结合孢粉和有机地球化学指标进行综合分析,湖光岩玛珥湖δ13CTOC变化曲线可划分为6个演化阶段:62~58和48~40.5kaBP两个时段的δ13CTOC值偏负,沉积物中有机质主要来源于热带—亚热带地区的陆生C3森林植被,反映了温暖潮湿的气候环境;58~48和40.5~17.2kaBP期间δ13CTOC值明显偏正,沉积物中有机质主要源自C4草本植物,反映了湖光岩地区有效降水量减少、干旱程度增加导致湖光岩玛珥湖湖面下降,大量C4草本植物生长在暴露的湖滨岸;17.2~4kaBP时段内δ13CTOC值尽管存在更加频繁的波动,但总体呈现逐渐偏负的趋势,反映了暖湿和冷干气候多次交替但总体上逐渐变暖、变湿的气候环境;4kaBP以来δ13CTOC值存在逐渐偏正的趋势,虽然不排除人类活动的影响,但很可能反映了干旱程度的再次增加。综合分析表明,有效降水量(降水量-蒸发量)是控制湖光岩玛珥湖地区C3/C4植物相对生物量变化的主导因素。湖光岩玛珥湖有机碳同位素的研究结果支持区域气候环境而不是大气CO2浓度变化是末期冰期以来热带低纬度地区C3/C4植被相对生物量变化的主要原因。刘强 顾兆炎 刘嘉麒 游海涛 吕厚远 储国强 祁向雷 Jorg F W Negendank Jens Mingram Georg Schettler 2005海洋地质与第四纪地质2005,25,2:34
51H-MRS in patients with glial tumors:a multicenter study显示文摘Negendank WG Sauter R Brown TR 1996J Neurosurg1996,84,3:1
6High resolution sediment and vegetation responses to Younger Dryas climate change in varved lake sediments from Meerfelder Maar,Germany显示文摘Brauer A Endres C G nter C Litt T Stebich M Negendank J F W 0,,:1
7An abrupt wind shift in western Europe at the onset of the Younger Dryas cold period显示文摘Brauer A Haug G H Dulski P Sigman D M Negendank J W 0,,:1
8Proton magnetic resonance spectroscopy in patients with glial tumors:a multicenter study显示文摘Negendank WG Sauter R Brown TR 1996J Neurosurg1996,84,:1
9MR spectroscopy of musculoskeletal soft-tissue tumors显示文摘Negendank WG 1995Magn Reson Imaging Clin N Am1995,3,:1
10Proton Magnetic resonance spectroscopy in patients with glial tumors: a multicenter study显示文摘Negendank W6 Sauter R Brown TR et al 1996J ~eurosurg1996,84,3:1
11Studies of human tumors by MRS:a review显示文摘Negendank W 1992NMR Biomed1992,5,5:1
12The value of annually laminated lake sediments in Palaeoenvironment reconstruction显示文摘Brauer A Negendank J F W 2002Quaternary International2002,88,:1
13Studies of human tumors by MRS : a review 显示文摘Negendank W 1992NMR Biomed1992,5,5:1
14Intratumoral lipids in ^1H MRS in vivo in brain tumors: experience of the Siemens cooperative clinical trial 显示文摘Negendank W Sauter R 1996Anticancer Res1996,16,3:1
15Proton mag- netic resonance spectroscopy in patients with glial tumors:a multicenter study显示文摘Negendank WG Sauter R Brown TR 1996J Neurosurg1996,84,3:1
16Evidence for clonal disease by magnetic resonance imaging in patients with hypoplastic marrow disorders显示文摘 Weissman D Bey TM 1991Blood1991,78,11:1
17Studies of human tumors by MRS:a review(Review)显示文摘Negendank W 1992NMR Biomed1992,5,5:1
18Studies of human tumors by MRS : a review 显示文摘Negendank W 1992NMR Biomed1992,5,5:1
19Proton magnetic resonance spectroscopy in patients with glial tumors:a multicenter study显示文摘Negendank WG Sauter R Brown TR 1996J Neurosurg1996,84,3:1
20MR spectroscopy of musculoskeletal soft-tissue tumors显示文摘Negendank WG 1995Magn Reson Imaging Clin North Am1995,3,4:1
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