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Holocene climate variation denoted by Barkol Lake sediments in northeastern Xinjiang and its possible linkage to the high and low latitude climates

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Science china Earth Sciences 2011年第4期54卷 603-614页

作者： xue jibin & zhong wei 1 school of geography,south china normal university,guangzhou 510631,china 2 Key Laboratory of Oasis Ecology(Ministry of Education) ,Xinjiang university,Urumqi 830046,china 3 Key Laboratory of Western china's Environmental Systems(Ministry of Education) ,Lanzhou university,Lanzhou 730000,china school of geography South China Normal University Guangzhou China Key Laboratory of Oasis Ecology (Ministry of Education) Xinjiang University Urumqi China Key Laboratory of Western china’s Environmental Systems (Ministry of Education) Lanzhou University Lanzhou China

The climate over the closed inland Barkol Lake,which is located in northeastern Xinjiang Uygur Autonomous Region,is significantly influenced by westerly winds *** improve our understanding of past climate processes in westerly wind influenced regions in northwestern china,a 250-cm sediment section was retrieved from this *** taking the carbon reservoir effect into consideration,the chronological sequence of this section was reconstructed based on seven conventional radiocarbon dates of bulk samples,and the bottom age of this section was determined to be about 9400 cal a ***-proxy datasets,includingδ18O car,δ13C car of authigenic carbonate,and total organic carbon were examined using wavelet analysis and singular spectrum analysis *** show that the Holocene in the Barkol Lake region can be divided into four stages:(1) a cold and dry early stage before～8000 cal a BP;(2) a moderately warm and wet middle stage between～8000 and 6000 cal a BP;(3) a warm and dry stage,along with a cooling-wetting tendency from 6000 to 2700 cal a BP;and(4) a fluctuating cooling and wet stage between 2700-800 cal a BP,and a drier stage since 800 cal a *** general trend of Holocene climatic changes revealed by Barkol Lake sediments was in agreement with that of adjacent *** infer that climatic changes during the Holocene in the Barkol Lake region were influenced not only by high latitudes,especially the North Atlantic region climate,but also tropical low-latitude processes,such as the El Nio/La Nia-southern *** study demonstrates that the enhanced activities of ENSO may have played an important role in climatic changes in northeastern Xinjiang during the *** results also suggest that climatic patterns may be temporally different in the northern Xinjiang area in response to the changing predominant control of either the Westerly or the Asian summer monsoon,depending on the contrast of their relative strengths.

关键词： Barkol Lake Holocene climate change tropical processes northern high-latitude climate

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Strong light–matter interactions based on excitons and the abnormal all-dielectric anapole mode with both large field enhancement and low loss

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Photonics Research 2024年第4期12卷 854-864页

作者： YAN-HUI DENG YU-wei LU HOU-JIAO ZHANG zhong-HONG SHI ZHANG-KAI ZHOU xue-HUA WANG State Key Laboratory of Optoelectronic Materials and Technologies School of PhysicsSun Yat-sen UniversityGuangzhou 510275China Quantum Science Center of Guangdong–Hong Kong–Macao Greater Bay Area(Guangdong) Shenzhen 518045China

The room temperature strong coupling between the photonic modes of micro/nanocavities and quantum emitters(QEs) can bring about promising advantages for fundamental and applied *** the electric fields(EFs) by using plasmonic modes and reducing their losses by applying dielectric nanocavities are widely employed approaches to achieve room temperature strong ***,ideal photonic modes with both large EFs and low loss have been ***,we propose the abnormal anapole mode (AAM),showing both a strong EF enhancement of~70-fold (comparable to plasmonic modes) and a low loss of 34 meV,which is much smaller than previous records of isolated all-dielectric *** realizing strong coupling,we further show that by replacing the normal anapole mode with the AAM,the lasing threshold of the AAM-coupled QEs can be reduced by one order of magnitude,implying a vital step toward on-chip integration of nanophotonic devices.

关键词： dielectric mode coupling

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海南岛双池玛珥湖沉积正构烷烃记录揭示的中世纪暖期气候环境特征

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地理科学 2024年第3期44卷 543-552页

作者：卢毅薛积彬张永东马欣璐宋德卓钟巍华南师范大学地理科学学院广东广州510631

对采自海南岛双池玛珥湖的沉积岩芯(SCH17-04)进行了加速器质谱法(Accelerator Mass Spectrometry,AMS)^(14)C测年和正构烷烃组成的实验分析,据此探讨了中国热带北缘地区约775-1550年间的气候环境特征。结果表明,SCH17-04岩芯正构烷烃... 详细信息

对采自海南岛双池玛珥湖的沉积岩芯(SCH17-04)进行了加速器质谱法(Accelerator Mass Spectrometry,AMS)^(14)C测年和正构烷烃组成的实验分析,据此探讨了中国热带北缘地区约775-1550年间的气候环境特征。结果表明,SCH17-04岩芯正构烷烃记录揭示了该湖沉积的有机质主要来自于陆生高等植物,也包含部分水生植物和菌藻类植物的输入;利用正构烷烃相关组分的比值发现,在中世纪暖期(Medieval Warm Period,MWP,约950-1350年)时,研究区草本植物比例明显增大,木本植物占比相对偏小,揭示出地处热带北缘的海南岛地区在中世纪暖期气候环境总体上较为偏干,而在黑暗时代冷期(Dark Ages Cold Period,DACP)晚期(约775-950年)和小冰期(Little Ice Age,LIA)早期(约1350-1550年),海南岛地区气候环境相对较为偏湿。区域对比分析发现,双池玛珥湖沉积正构烷烃记录与同处热带地区的雷州半岛湖光岩玛珥湖沉积、西沙群岛东岛湖泊沉积以及来自泰国的石笋记录等较为一致,都揭示了一个气候相对较为偏干的中世纪暖期,这可能跟同一时期热带辐合带(Intertropical Convergence Zone,ITCZ)南北迁移和热带雨带的扩张与收缩、太平洋东西部海区海表温度梯度变化等因素有关。

关键词：热带地区正构烷烃中世纪暖期小冰期

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Holocene Abrupt Climate Shifts and Mid-Holocene Drought Intervals Recorded in Barkol Lake of Northern Xinjiang of china

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Chinese Geographical Science 2008年第1期18卷 54-61页

作者： xue jibin zhong wei ZHAO Yinjuan PENG Xiaoying school of geography Science South China Normal University Guangzhou 510631 China National Laboratory of Western china＇s Environmental Systems Lanzhou University Lanzhou 730000 China

Study results in this paper have indicated that the Holocene climate in Xinjiang, Northwestem china has been alternating between wet and dry conditions, and was punctuated with a series of abrupt climate shifts. A sediment core taken from Barkol Lake in the northern Xinjiang of Northwest china was analyzed at 1 cm interval for grain-size distribution. Abrupt climate shifts revealed by the grain-size proxy occurred at ca 1.4, 3.0, 4.3, 5.6, 8.0 cal kyr B.E, which were well correlated to both the abrupt shifts recorded in the North Atlantic Ocean （NAO） and the Holocene sea surface temperature （SST） cooling events in the Arabian Ocean. The correlation indicated that the climatic changes in the extreme arid Northwest china were associated with the NAO, probably via the North Atlantic Oscillation-affected westerly winds. The strength and position of westerly winds probably modulated the Siberian-Mongolian high- pressure system （winter monsoon）, and played an important role in climate change of Northwest china. Moreover, an evident drought interval during the middle Holocene was also revealed by grain-size proxy.

关键词： abrupt climate shifts grain size Holocene Barkol Lake Xinjiang

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A New High-resolution Late Glacial-Holocene Climatic Record from Eastern Nanling Mountains in south china

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Chinese Geographical Science 2009年第3期19卷 274-282页

作者： xue jibin zhong wei ZHENG Yanming MA Qiaohong CAI Ying OUYANG Jun school of geography South China Normal University Guangzhou 510631 China

A 350-cm-long sediment core sequence from Dahu Swamp situated in the eastern Nanling Mountains was selected for high-resolution paleoclimatic reconstruction since the Late Glacial period. The multi-proxy records of this paper reveal several evidently dry and cold events that may coincide with the Oldest Dryas, the Older Dryas, the Younger Dryas in the late deglacial period. Two relatively wetter and warmer phases occurred in ca. 15,000-14,400 cal yr B.P. and 13,500-12,800 cal yr B.P. respectively may correspond to the Boiling and Allerod warming events. The Younger Dryas event （ca. 12,800-11,500 cal yr B.P.） revealed by multi-proxies was characterized by relatively colder and drier climate. A warmer and wetter climate, occurred in ca. 10,000~5000 cal yr B.P., was consistent with the Holoeene Optimum, which coincided with the maximum Northern Hemisphere insolation. The ＂8.2kyr cool event＂ and even the ＂8.8kyr cool event＂ were indicated as well from our sediment core. A dry mid-Holocene period （ca. 60000 3000 cal yr B.P.） indicated by multi-proxies does not follow the traditional concept of the wet mid-Holocene conditions observed in other regions in china.

关键词： Late Glacial period Holocene climatic record Dahu Swamp south china

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Dryness-wetness change and regional differentiation of flood-drought disasters in Guangdong during 1480-1940AD

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Journal of Geographical Sciences 2005年第3期15卷 286-292页

作者： zhong wei xue jibin PENG Xiaoying ZHAO Yinjuan College of Geographical Science South China Normal University Guangzhou 510631 China

Based on the historical records of the drought and flood disasters during 1480-1940AD, this paper reconstructs the sequences of wetness index （WI） and drought and flood disasters. We find a good identical relationship between the fluctuation of WI sequence and the δ^18O record of the GISP2 ice core in Greenland, which shows an apparent monsoonal disposal pattern of moisture and temperature. By applying the Morlet Wavelet Transform Method to deal with the data, several apparent periodicities, such as 7-8a, 11-15a, 20-23a and ca 50a, are revealed, among which some can be attributed to the solar forcing. Based on results of Cluster Analysis of dry-wet changes, we resume the regional differentiation pattern of flood-drought disasters all over Guangdong during different climatic intervals in the LIA and, find the western and northern parts of Guangdong have undergone drastic changes in drought-flood regional differentiation, but the eastern part is relatively stable, and the area of the Pearl River Delta shows stable condition of more flood disasters.

关键词： Guangdong climatic change drought and flood disaster regional differentiation the LIA

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DRY-WET EVOLUTION IN GUANGDONG PROVINCE DURING LAST 500 YEARS

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Chinese Geographical Science 2006年第1期16卷 63-69页

作者： xue Ji-bin zhong wei ZHEN Zhi-guo LIU wei school of geography Science south china normal university Guangzhou 510631 P.R. China

Based on the historical records in Guangdong Province during the last 500a, the moist index sequence was reconstructed and analyzed by the correlation analysis, wavelet analysis and the power spcctrum analysis. The resuits indicate that： 1 ） The El Nino events have evident correlations with the droughts happened in the west and north of Guangdong Province, which intensified the dryness and wetness distribution patterns in these areas in a certain degree. 2） Good correspondence relations exist among the moist index sequence, Greenland ice core oxygen isotope record and the winter-half-year temperature sequence in the eastern china, which showed pattern of moisture and temperature. 3） By applying the wavelet analysis to deal with icities are revealed, among which some can be attributed to the solar activities. At monsoon （especially the East Asian monsoon） activity and the human activity may an apparent monsoonal disposal the data, several apparent period. the same tithe, the ENSO event, also have some influences on the periodicities of the climatic changes in Guangdong Province. 4） Guangdong will persist in dry period before 2040 （±5 years） though some little waterlogged period will also exist in this interval, and after that great floods maybe take place in Guangdong. We think that the variety range of the dryness and wetness has increasing tendency in Guangdong Province in future several even hundred years.

关键词： dry-wet evolution El Nino monsoon solar activity Guangdong Province

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近4万年来雷州半岛北部地区汞沉积及其影响机制

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沉积学报 2023年第1期41卷 233-242页

作者：马欣璐薛积彬宋德卓钟巍华南师范大学地理科学学院广州510631

雷州半岛地处热带北缘,受东亚季风影响强烈。以取自雷州半岛北部下录地区的埋藏泥炭沉积作为研究材料,测试分析了该岩心的汞浓度及其分布情况,将测试结果与其他气候环境代用指标如孢粉、炭屑、烧失量(LOI)以及有机碳同位素(δ^(13)C_(or... 详细信息

雷州半岛地处热带北缘,受东亚季风影响强烈。以取自雷州半岛北部下录地区的埋藏泥炭沉积作为研究材料,测试分析了该岩心的汞浓度及其分布情况,将测试结果与其他气候环境代用指标如孢粉、炭屑、烧失量(LOI)以及有机碳同位素(δ^(13)C_(org))等进行对比分析,讨论自MIS(Marine Isotope Stages)-3晚期(约40 cal ka B.P.)至全新世早期(约6.9 cal ka B.P.)区域气候与环境变化影响下的汞沉积过程及可能的影响机制。结果显示:近4万年以来,沉积物的汞浓度与乔木类孢粉浓度的变化较吻合,两者之间显示出较高的相关性,揭示了晚更新世晚期以来,森林群落作为重要的地表汞库,在地区汞沉积过程中起到固定、储存和传输作用。此外,汞浓度与岩心中炭屑沉积通量(指示了区域性野火发生状况)的变化存在相反趋势,反映了区域性野火活动对地表植被以及土壤有机质的焚毁破坏,造成地表汞向大气的释放,不利于汞在地表和沉积物中的沉积与保存。对比不同区域的汞沉积记录发现,晚更新世晚期以来,下录泥炭汞浓度记录与全球其他地区汞记录、粉尘记录等具有较高的相似度,特别是MIS-2时期均存在明显峰值,反映了全球气候变化影响下,大气粉尘沉降对地表汞的输送和沉积具有较大贡献。

关键词：泥炭沉积汞浓度环境变化雷州半岛

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海南东部小海潟湖沉积物地球化学特征及对古台风活动的指示

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湖泊科学 2019年第6期31卷 1758-1769页

作者：游爱华薛积彬谢露华程嵘魏志强钟巍华南师范大学地理科学学院广州510631 中国科学院广州地球化学研究所广州510640

为探讨海南东部历史时期的气候环境变化,2015年于海南岛东海岸小海潟湖中采集了一根长73 cm的柱状样(XH15-02),在年代学(210Pb和AMS14C)测试的基础上,开展了多环境代用指标(总有机碳(TOC)、总氮(TN)、有机碳稳定同位素、干密度等)的测... 详细信息

为探讨海南东部历史时期的气候环境变化,2015年于海南岛东海岸小海潟湖中采集了一根长73 cm的柱状样(XH15-02),在年代学(210Pb和AMS14C)测试的基础上,开展了多环境代用指标(总有机碳(TOC)、总氮(TN)、有机碳稳定同位素、干密度等)的测试和分析.结果表明,XH15-02柱状样TOC与TN含量有很好的相关性,C/N比值在10.41~23.33之间变化,有机碳稳定同位素(δ13Corg)值在-25.14‰^-23.29‰之间.通过对多气候环境代用指标的分析,以及与历史文献资料和其他自然代用指标的综合比对,认为XH15-02孔岩芯沉积记录了研究区过去1100多年来较为丰富的气候环境、台风活动以及人类活动影响等信息.近千年来,小海潟湖沉积有机物主要以陆源输入为主,据估算该岩芯有机碳陆生来源约占47.00%~73.43%,但在不同时期变化幅度较大,该陆源有机碳含量变化可能主要反映了历史时期海南东部地区的干湿变化历史;自1850年以来,XH15-02孔岩芯沉积通量的显著增加与当地人口的快速增长历史一致,反映了研究区近二百年来可能受到的人类对自然界的开发活动影响强烈;多个具有显著偏正δ13Corg记录的时期同史料记载以及周边区域地质记录中的"大风"、"海溢"、"风暴"等事件发生时间较为相近,可能揭示了历史时期的台风或高海平面事件,进而认为小海潟湖沉积在重建历史时期海南地区台风活动等方面具有很大潜力.

关键词：小海潟湖有机碳同位素人类活动强台风

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海南小海潟湖沉积物地球化学揭示的近千年气候环境变化

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地球化学 2022年第2期51卷 202-212页

作者：宋德卓薛积彬孙升升钟巍华南师范大学地理科学学院广东广州510631

对取自海南岛东部小海潟湖的柱状岩心(XH15-02)开展了年代学(^(210)Pb和AMS ^(14)C)和常量/微量元素分析,在建立可靠年代模型的基础上,探讨了该潟湖沉积物地球化学元素及其比值的环境指示意义,进而揭示近千年来海南地区的气候环境变化... 详细信息

对取自海南岛东部小海潟湖的柱状岩心(XH15-02)开展了年代学(^(210)Pb和AMS ^(14)C)和常量/微量元素分析,在建立可靠年代模型的基础上,探讨了该潟湖沉积物地球化学元素及其比值的环境指示意义,进而揭示近千年来海南地区的气候环境变化历史。研究表明:(1)小海潟湖沉积物地球化学元素比值(Al/Ca、Mg/Ca、K/Ca、Fe/Ca、Ti/Ca)主要反映了近千年来海南地区的降水变化历史,具体表现在中世纪暖期(870~1100 AD)海南地区的降水较少,而小冰期降水波动较为明显,总体上较中世纪暖期降水偏多,这可能与近千年来热带辐合带的南北移动以及西太平洋暖池海表温度变化有关;(2)结合史料文献中有关“飓风”、“飚风”等记载,从小海潟湖沉积物地球化学元素及其比值序列中共识别出8次强台风事件,为当前全球变暖背景下我国热带地区台风活动趋势预测提供了参考和科学依据。

关键词：潟湖沉积地球化学元素降水古台风海南岛

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