|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Impacts of climate warming on plants phenophases in China for the last 40 years显示文摘Based on plant phenology data from 26 stations of the Chinese Phenology Observation Network of the Chinese Academy of Sciences and the climate data, the change of plant phenophase in spring and the impact of climate warming on the plant phenophase in China for the last 40 years are analyzed. Furthermore, the geographical distribution models of phenophase in every decade are reconstructed, and the impact of climate warming on geographical distribution model of phenophase is studied as well. The results show that (i) the response of phenophase advance or delay to temperature change is nonlinear. Since the 1980s, at the same amplitude of temperature change, phenophase delay amplitude caused by temperature decrease is greater than phenophase advance amplitude caused by temperature increase; the rate of phenophase advance days decreases with temperature increase amplitude, and the rate of phenophase delay days increases with temperature decrease amplitude. (ii) The geographical distribution model between | ZHENG Jingyun GE Quansheng HAO Zhixin | 2002 | Chinese Science Bulletin2002，47，21： | 41 |
| 2 | Meiyu in the middle and lower reaches of the Yangtze River since 1736显示文摘'Yu Xue Fen Cun' records during the Qing Dynasty are used to identify the starting and ending dates of Meiyu at the period of 1736―1911. These results, along with the instrumental meteorological records, are used to reconstruct the series of length and precipitation of Meiyu during 1736―2000 over the middle and lower reaches of the Yangtze River. The characteristics of Meiyu are analyzed since 1736. Moreover, the strength of East Asian Summer Monsoon and locations of rainband are discussed, based on the relationship between the length of Meiyu and the Index of East Asian Summer Monsoon. It is found that the starting and ending dates and the length of Meiyu have significant interannual and in-terdecadal variations. Apart from 7―8 years, 20―30 years and 40 years cycles for the lengths of Meiyu, the centennial oscillation is also presented. The length of Meiyu, monsoon rainband movement over eastern China, and the strength of East Asian Summer Monsoon (EASM) have a very good correlation, which can be expressed in the following: during the periods of 1736―1770, 1821―1870 and 1921―1970, the EASM was stronger, and the monsoon rainband was located in North China and South China easily, corresponding to the decreased length of Meiyu. Whereas during the periods of 1771―1820, 1871―1920 and 1971―2000, the EASM was weaker and monsoon rainband usually stopped at the middle and lower reaches of the Yangtze River, corresponding to the increased length of Meiyu. | GE QuanSheng GUO XiFeng ZHENG JingYun HAO ZhiXin | 2008 | Chinese Science Bulletin2008，53，1： | 28 |
| 3 | Precipitation cycles in the middle and lower reaches of the Yellow River (1736-2000)显示文摘Based on the long-term precipitation series with annual time resolution in the middle and lower reaches of the Yellow River and its four sub-regions during 1736-2000 recon- structed from the rainfall and snowfall archives of the Qing Dynasty, the precipitation cycles are analyzed by wavelet analysis and the possible climate forcings, which drive the precipita- tion changes, are explored. The results show that: the precipitation in the middle and lower reaches of the Yellow River has inter-annual and inter-decadal oscillations like 2-4a, quasi-22a and 70-80a. The 2-4a cycle is linked with El Nio events, and the precipitation is lower than normal year in the occurrence of the El Nio year or the next year; for the quasi-22a and the 70-80a cycles, Wolf Sun Spot Numbers and Pacific Decadal Oscillation (PDO) coincide with the two cycle signals. However, on a 70-80a time scale, the coincidence between solar activity and precipitation is identified before 1830, and strong (weak) solar activity is generally correlated to the dry (wet) periods; after 1830, the solar activity changes to 80-100a quasi-century long oscillation, and the adjusting action to the precipitation is be- coming weaker and weaker; the coincidence between PDO and precipitation is shown in the whole time series. Moreover, in recent 100 years, PDO is becoming a pace-maker of the precipitation on the 70-80a time scale. | HAO Zhixin ZHENG Jingyun GE Quansheng | 2008 | Journal of Geographical Sciences2008，18，1： | 22 |
| 4 | Simulated and reconstructed winter temperature in the eastern China during the last millennium显示文摘The reconstructed temperature anomalies in the eastern China were compared with the output from a 1000-year model simulation in an attempt to evaluate the model’s regional simulation skills and to understand the causes of climate change in China over the last millennium. The reconstructed data are the winter half-year temperature anomalies in the central region of eastern China (25°-40°N, east of 105°E) for the last 1000 years with a 30-year resolu- tion. The model used is the global atmosphere-ocean coupled climate model, ECHO-G, which was driven by time-varying external forcings including solar radiation, volcanic erup- tions, and greenhouse gas concentrations (CO2 and CH4) for the same period. The correlation coefficient between the simulated and reconstructed time series is 0.37, which is sta- tistically significant at a confidence level of 97.5%. The Me- dieval Warm Period (MWP) during 1000-1300 A.D., the Little Ice Age (LIA) during 1300-1850 A.D. and the modern warming period after 1900 A.D. are all recognizable from both the simulated and reconstructed temperatures. The anomalies associated with the LIA and the modern warming simulated by the model are in good consistency with the re- constructed counterpart. In particular during the Maunder sun-spot minimum (1670-1710 A.D.), both the simulated and reconstructed temperature anomalies reach their min- ima without any phase difference. But in the earlier MWP, significant discrepancies exist between the simulation and the reconstruction, which might reflect the degrading quality of the reconstruction data. The range of the simulated anoma- lies (1.62 K) is comparable with that of reconstructed (2.0 K). Diagnosis of the model results indicates that, during the last millennium, variations in solar radiation and volcanic activ- ity are the main controlling factors on regional temperature change, while in the recent 100 years, the change of the con- centration of greenhouse gases plays most important role in explaining the rapid temperature rising. | LIU Jian H. Storch CHEN Xing E. Zorita ZHENG Jingyun WANG Sumin | 2005 | Chinese Science Bulletin2005，50，24： | 21 |
| 5 | Variation of precipitation for the last 300 years over the middle and lower reaches of the Yellow River显示文摘The precipitation at 17 stations over the middle and lower reaches of the Yellow River is reconstructed during the period of 1736―1910, using the snow and rainfall records in the Qing Dynasty, together with the instrumental observation data of precipitation and farmland soil moisture content. The soil physics model related to rainfall infiltration and the surface water bal-ance equation are taken as main reconstruction methodology. The field infiltration experiment by artificial rainfall is conducted to check the reliability. And the precipitation series over the middle and lower reaches of the Yellow River and its 4 sub-regions are established, going back to 1736. Analysis of the time series indicates that the abrupt change of precipitation from high to low oc-curs around 1915 over the middle and lower reaches of the Yellow River. During the three peri-ods of 1791―1805, 1816―1830 and 1886―1895, the precipitation is markedly higher than the mean of the series. While both the periods of 1916―1945 and 1981―2000 are characterized by less precipitation. Three periodicities of 22―25a, 3.9a and 2.7a are shown in the precipitation fluctuation over the middle and lower reaches of the Yellow River. Moreover, the periodical signal of 22―25a becomes weaker and weaker since the abrupt change of 1915 and disappears in the late 1940s, and then the periodical signal of 35―40a appears instead. | ZHENG Jingyun HAO Zhixin GE Quansheng | 2005 | Science China Earth Sciences2005，48，12： | 20 |
| 6 | Rates of temperature change in China during the past 2000 years显示文摘Using 24 proxy temperature series,the rates of temperature change in China are analyzed at the 30-to 100-year scales for the past 2000 years and at the 10-year scale for the past 500 years.The results show that,at the 100-year scale,the warming rate for the whole of China in the 20th century was only 0.6±1.6°C/100 a (interval at the 95% confidence level,which is used hereafter),while the peak warming rate for the period from the Little Ice Age (LIA) to the 20th century reached 1.1±1.2°C/100 a,which was the greatest in the past 500 years and probably the past 2000 years.At the 30-year scale,warming in the 20th century was quite notable,but the peak rate was still less than rates for previous periods,such as the rapid warming from the LIA to the 20th century and from the 270s-290s to 300s-320s.At the 10-year scale,the warming in the late 20th century was very evident,but it might not be unusual in the context of warming over the past 500 years.The exact timing,duration and magnitude of the warming peaks varied from region to region at all scales.The peak rates of the 100-year scale warming in the AD 180s-350s in northeastern China as well as those in the 260s-410s and 500s-660s in Tibet were all greater than those from the mid-19th to 20th century.Meanwhile,the rates of the most rapid cooling at scales of 30 to 100 years in the LIA were prominent,but they were also not unprecedented in the last 2000 years.At the 10-year scale,for the whole of China,the most rapid decadal cooling in the 20th century was from the 1940s to 1950s with a rate of 0.3±0.6°C/10 a,which was similar to rates for periods before the 20th century.For all regions,the rates of most rapid cooling in the 20th century were all less than those for previous periods. | GE QuanSheng ZHANG XueZhen HAO ZhiXin ZHENG JingYun | 2011 | Science China Earth Sciences2011，54，11： | 17 |
| 7 | Agriculture Development-induced Surface Albedo Changes and Climatic Implications Across Northeastern China显示文摘To improve the understandings on regional climatic effects of past human-induced land cover changes,the surface albedo changes caused by conversions from natural vegetation to cropland were estimated across northeastern China over the last 300 years,and its climatic effects were simulated by using the Weather Research and Forecasting (WRF) model.Essential natural vegetation records compiled from historical documents and regional optimal surface albedo dataset were used.The results show that the surface albedo decreased by 0.01-0.03 due to conversions from grassland to cropland in the Northeast China Plain and it increased by 0.005-0.015 due to conversions from forests to cropland in the surrounding mountains.As a consequence,in the Northeast China Plain,the surface net radiation increased by 4-8 W/m 2,2-5 W/m 2,and 1-3 W/m 2,and the climate was therefore warmed by 0.1℃-0.2℃、0.1℃-0.2℃、 0.1℃-0.3 ℃ in the spring,autumn and winter,respectively.In the surrounding mountain area,the net radiation decreased by less than 1.5 W/m 2,and the climate was therefore cooled too slight to be detected.In summer,effects of surface albedo changes on climate were closely associated with moisture dynamics,such as evapotranspiration and cloud,instead of being merely determined by surface radiation budget.The simulated summer climatic effects have large uncertainties.These findings demonstrate that surface albedo changes resulted in warming climate effects in the non-rainy seasons in Northeast China Plain through surface radiation processes while the climatic effects in summer could hardly be concluded so far. | ZHANG Xuezhen WANG Wei-Chyung FANG Xiuqi YE Yu ZHENG Jingyun | 2012 | Chinese Geographical Science2012，22，3： | 15 |
| 8 | General characteristics of climate changes during the past 2000 years in China显示文摘The general characteristics of climate changes over the past 2000 years in China,regional differences and uncertainties were analyzed based on the recently peer-reviewed high time-resolution climatic reconstructions.The results showed that there exists four warm periods of the temperature variation in China since the Qin Dynasty,including the western and eastern Han Dynasties(200 BC-AD 180),the Sui and Tang dynasties(541-810),the Song and Yuan dynasties(931-1320),and the 20th century,and three cold phases involving the Wei,Jin,and North-South Dynasties(181-540),the late Tang Dynasty(811-930),and the Ming and Qing dynasties(1321-1920).The Song and Yuan warm period is consistent with the Medieval Warm Period over the Northern Hemisphere,and the cold phases of the North-South Dynasties and the Ming and Qing dynasties are paralleled to the Dark Ages Cold Period and the Little Ice Age,respectively.The 13th-15th century could be a shift to the wet condition of the climate,and the low precipitation variability is exhibited in western China prior to 1500.In the context of the climate warming,the pattern of the drought in north and flood in south is prevalent over the eastern China.In addition,the published reconstructions have a high level of confidence for the past 500 years,but large uncertainties exist prior to the 16th century. | GE QuanSheng ZHENG JingYun HAO ZhiXin LIU HaoLong | 2013 | Science China Earth Sciences2013，56，2： | 15 |
| 9 | NEECF: a project of nutrient enrichment experiments in China’s forests显示文摘Anthropogenic nitrogen(N)emissions to atmosphere have increased dramatically in China since 1980s,and this increase has aroused great concerns on its ecological impacts on terrestrial ecosystems.Previous studies have showed that terrestrial ecosystems in China are acting as a large carbon(C)sink,but its potential in the future remains largely uncertain.So far little work on the impacts of the N deposition on C sequestration in China’s terrestrial ecosystems has been assessed at a national scale.Aiming to assess and predict how ecological processes especially the C cycling respond to the increasing N deposition in China’s forests,recently researchers from Peking University and their partners have established a manipulation experimental network on the ecological effects of the N deposition:Nutrient Enrichment Experiments in China’s Forests Project(NEECF).The NEECF comprises 10 experiments at 7 sites located from north to south China,covering major zonal forest vegetation in eastern China from boreal forest in Greater Khingan Mountains to tropical forests in Hainan Island.This paper introduces the framework of the NEECF project and its potential policy implications. | Enzai Du Zhang Zhou Peng Li Xueyang Hu Yuecun Ma Wei Wang Chengyang Zheng Jianxiao Zhu Jin-Sheng He Jingyun Fang | 2013 | Journal of Plant Ecology2013，6，5： | 13 |
| 10 | Major advances in studies of the physical geography and living environment of China during the past 70 years and future prospects显示文摘The natural environment provides material essentials for human survival and development. The characteristics,processes, regional differentiation and forcing mechanisms of the elements of the natural environment(e.g. geomorphology,climate, hydrology, soil, etc.) are the main objects of research in physical geography. China has a complex natural environment and huge regional differentiation and therefore it provides outstanding reserach opportunities in physical geography. This review summarizes the most important developments and the main contributions of research in the physical geography and human living environment in China during the past 70 years. The major topics addressed are the uplift of the Tibetan Plateau and the evolution of its cryosphere, the development of fluvial systems, the acidification of the vast arid region of the Asian interior, variations in the monsoon and westerly climate systems on multiple timescales, the development of lakes and wetlands, the watershed system model, soil erosion, past human-environment interactions, biogeography, and physical geographic zonality. After briefly introducing international research developments, we review the history of research in physical geography in China, focusing on the major achievements and major academic debates, and finally we summarize the status of current research and the future prospects. We propose that in the context of the national demand for the construction of an ecological civilization, we should make full use of the research findings of physical geography, and determine the patterns and mechanisms of natural environmental processes in order to continue to promote the continued contribution of physical geography to national development strategies, and to further contribute to the theory of physical geography from a global perspective. | Fahu CHEN Bojie FU Jun XIA Duo WU Shaohong WU Yili ZHANG Hang SUN Yu LIU Xiaomin FANG Boqiang QIN Xin LI Tingjun ZHANG Baoyuan LIU Zhibao DONG Shugui HOU Lide TIAN Baiqing XU Guanghui DONG Jingyun ZHENG Wei YANG Xin WANG Zaijun LI Fei Wang Zhenbo HU Jie WANG Jianbao LIU Jianhui CHEN Wei HUANG Juzhi HOU Qiufang CAI Hao LONG Ming JIANG Yaxian HU Xiaoming FENG Xingguo MO Xiaoyan YANG Dongju ZHANG Xiuhong WANG Yunhe YIN Xiaochen LIU | 2019 | Science China Earth Sciences2019，62，11： | 11 |
| 11 | Characteristics of Temperature Change in China over the Last 2000 years and Spatial Patterns of Dryness/Wetness during Cold and Warm Periods显示文摘This paper presents new high-resolution proxies and paleoclimatic reconstructions for studying climate changes in China for the past 2000 years. Multi-proxy synthesized reconstructions show that temperature variation in China has exhibited significant 50–70-yr, 100–120-yr, and 200–250-yr cycles. Results also show that the amplitudes of decadal and centennial temperature variation were 1.3℃ and 0.7℃, respectively, with the latter significantly correlated with long-term changes in solar radiation, especially cold periods, which correspond approximately to sunspot minima. The most rapid warming in China occurred over AD 1870–2000, at a rate of 0.56°± 0.42℃(100 yr)^(-1); however, temperatures recorded in the 20 th century may not be unprecedented for the last 2000 years, as data show records for the periods AD 981–1100 and AD1201–70 are comparable to the present. The ensemble means of dryness/wetness spatial patterns in eastern China across all centennial warm periods illustrate a tripole pattern: dry south of 25°N, wet from 25°–30°N, and dry to the north of 30°N. However, for all centennial cold periods, this spatial pattern also exhibits a meridional distribution. The increase in precipitation over the monsoonal regions of China associated with the 20 th century warming can primarily be attributed to a mega El Nino–Southern Oscillation and the Atlantic Multidecadal Oscillation. In addition, a significant association between increasing numbers of locusts and dry/cold conditions is found in eastern China. Plague intensity also generally increases in concert with wetness in northern China, while more precipitation is likely to have a negative effect in southern China. | Quansheng GE Haolong LIU Xiang MA Jingyun ZHENG Zhixin HAO | 2017 | Advances in Atmospheric Sciences2017，34，8： | 10 |
| 12 | When will China achieve its carbon emission peak?显示文摘Global warming is primarily attributed to the significant increase in atmospheric CO2 concentration,which is caused mainly by carbon emissions generated from fossil fuel combustion[1].Efficient measures are required to control these emissions and reduce global warming. | Tianli Zheng Jiangling Zhu Shaopeng Wang Jingyun Fang | 2016 | National Science Review2016，3，1： | 9 |
| 13 | Reconstructing temperature change in Central East China during 601-920 AD显示文摘Using historical records on first and last frost and snow,spring cultivation,David peach blossom,autumn crop harvest,grade of sea freeze and change in northern citrus boundary,we reconstructed temperature change during 601-920 AD.The mean temperature of the winter half-year(October to April)over Central East China during this period was about-0.22°C higher than that of the present(1961-2000 AD mean).During 601-820 AD,mean temperature was about-0.52°C higher than the present.During 821-920 AD,the mean temperature was 0.42°C lower than the present.The temperature fluctuations were characterized by a maximum amplitude of 1.05°C at the centennial scale,1.38°C at the 50-year scale,2.02°C at the 30-year scale,and 2.3°C at the 20-year scale.There were four peaks warmer than today(601-620 AD,mean of 1°C higher temperature;641-660 AD,1.44°C;701-720 AD,0.88°C;781-800 AD,0.65°C).Three cold periods were in 741-760,821-840,and 881-900 AD,the mean temperature of which was 0.37-0.87°C lower than the present. | GE QuanSheng LIU HaoLong ZHENG JingYun ZHANG XueZhen | 2010 | Chinese Science Bulletin2010，55，34： | 8 |
| 14 | 1876-1878 severe drought in North China:Facts,impacts and climatic background显示文摘Based on the reconstructed precipitation series in North China from historical documents, the 1876-1878 drought was identified as the most severe and extreme one in North China over the past 300 years. Meanwhile, the spatial patterns of seasonal and annual precipitation during 1876-1877 were analyzed and the social and economic impacts related with this drought event were evaluated according to the descriptions in the historical documents. The results indicated that this long-lasting drought started by the spring of 1876 and did not stop until the spring of 1878. Within the three years, the harvest failures brought the rice price increased to 5-10 times than that in the normal year, and the total population in the five provinces over North China decreased by more than 20 million due to a large number of dead people and migrations. In addition, related investigations suggested that the 1876-1878 drought was prevalent worldwide, which has possible link with abnormal high SST in the equatorial central and eastern Pacific, strong El Nio episode and positive AAO anomalies. | HAO ZhiXin ZHENG JingYun WU GuoFeng ZHANG XueZhen GE QuanSheng | 2010 | Chinese Science Bulletin2010，55，26： | 8 |
| 15 | Reconstruction of temperature series in China for the last 5000 years显示文摘有为在中国的最后 5000 年的 100 年决定的一个温度系列被 using31 重建了从最后 20 年里的最近的出版物的长期的温度代理系列。代理记录包括花粉,石笋,湖沉积,泥炭,冰核心和历史的文件。结果表明在千年的规模温度变化,它在 3050-250 BC,它在 250 BC 是冷的 - 1950 广告。在上述二个时期,有亚规模温度变化的许多阶段。结果也在 2850 BC, 2350 BC, 1350 BC, 950-350 BC, 50-250 广告,和 550 广告在这个世纪显示出明显的温度差异到在东方季风区域, Qinghai- 西藏区域和西北的区域之间的多世纪规模。在这篇论文的重建的系列和某诺思半球温度系列之间的比较显示在长期的规模变化,在中国的温度变化在最后 5000 年期间在有北半球的短语,当在到多世纪的世纪在那里的规模是时,在开始和结束的差别预定,它可以暗示温度变化不在不同区域同时发生。 | GE Quansheng WANG Shunbing ZHENG Jingyun | 2006 | Progress in Natural Science:Materials International2006，16，8： | 8 |
| 16 | A facile surfactant-free synthesis of Rh flower-like nanostructures constructed from ultrathin nanosheets and their enhanced catalytic properties显示文摘Rh 是广泛地在许多器官的反应被使用的重要催化剂。在最近的年里,许多努力集中了于由与控制尺寸和形态学制作催化剂 nanoparticles 改进它的催化效率。然而,也把有机化合物用作反应媒介或盖住代理人的经常采用的合成线路经常在催化剂表面上导致剩余分子,它急速地接着减少催化表演。此处,我们报导甲醛经由 Rh (acac )3 的热水的减小获得的新奇 Rh 象花的结构的灵巧的、水的、没有表面活化剂的合成。唯一的 Rh nanoflowers 从 ultrathin nanosheets 被构造,其基础表面包括了 { 111 } 有 ~ 的平均厚度的方面 1.1 nm。特定的表面区域由公司脱衣测量了 79.3 是 m 2 钟声到 134.4 食火鸟的浸透的磁化 ???? 愠汬祯湩吗?? | Yaqi Jiang Jingyun Su Yanan Yang Yanyan Jia Qiaoli Chen Zhaoxiong Xie Lansun Zheng | 2016 | Nano Research2016，9，3： | 7 |
| 17 | Low Cycle Fatigue and Strengthening Mechanism of Cold Extruded Large Diameter Internal Thread of Q460 Steel显示文摘高张力钢(LDITHSS ) 的内部线由传统的方法生产了的大直径总是有低精确性和短生活的问题。与传统的方法相比,冷挤出过程是一个有效工具认识到更高的精确性和长寿。LDITHSS 的低周期的疲劳性质被实验获得,并且疲劳裂缝的开始和繁殖被扫描电子显微镜(SEM ) 观察。基于机械性质,表面微观结构和剩余应力,冷渗出的大直径的加强的机制内部线(LDIT ) 被讨论。结果证明新谷物或亚谷物能在冷挤出期间由于谷物分割和谷物精炼在 LDIT 的表面上被形成。含纤维的结构是伸长并且在渗出的表面上沿着导致剩余的牙齿表面的正常方向优化了压缩应力出现。在冷挤出以后的 LDIT 的最大的紧张压力被发现是 192.55 kN。在低应力骑车下面,线上的收益压力增加,裂缝还原剂的繁殖率,吗疲劳生活因此与减少的表面谷物直径和生活增加到 45.539 的平均疲劳显著地被改进???蟳?寪螥??????蟳??鲢駻?媣??鯣???????????廩?仙哠??????矙璣???吗??????????????????蟳龢駻???????辧????????鲥?????焀?焘?焘?? | MIAO Hong MEI Qing YUAN Jingyun ZHENG Zaixiang JIN Yifu ZUO Dunwen | 2016 | Chinese Journal of Mechanical Engineering2016，29，3： | 7 |
| 18 | Two centuries of April-July temperature change in southeastern China and its influence on grain productivity显示文摘China is a traditional agriculture based country and one main region for crop production is southeastern China where temperature is a dominant climate variable affecting agriculture. Temperature and social disturbances both influence crop production, yet distinguishing their relative impacts is difficult due to a lack of reliable, high-resolution historical climatic records before the very recent period. Here we present the first tree-ring based warm-season temperature reconstruction for southeastern China, a core region of the East Asian monsoon, for the past 227 years. The reconstruction target was April-July mean temperature, and our model explained 60.6% of the observed temperature variance during 1953–2012.Spatial correlation analysis showed that the reconstruction is representative of April-July temperature change over most of eastern China. The reconstructed temperature series agrees well with China-scale(heavily weighted in eastern China) agricultural production index values quite well at decadal timescales.The impacts of social upheavals on food production, such as those in the period 1920–1949, were confirmed after climatic influences were excluded. Our study should help distinguish the influence of social disturbance and warm-season temperature on grain productivity in the core agricultural region of China during the past two centuries. | Jiangfeng Shi Jinbao Li David D.Zhang Jingyun Zheng Shiyuan Shi Quansheng Ge Harry F.Lee Yesi Zhao Jie Zhang Huayu Lu | 2017 | Science Bulletin2017，62，1： | 6 |
| 19 | Observed,Reconstructed,and Simulated Decadal Variability of Summer Precipitation over Eastern China显示文摘Based on observations made during recent decades, reconstructed precipitation for the period A.D. 1736–2000,dry–wet index data for A.D. 500–2000, and a 1000-yr control simulation using the Community Earth System Model with fixed pre-industrial external forcing, the decadal variability of summer precipitation over eastern China is studied. Power spectrum analysis shows that the dominant cycles for the decadal variation of summer precipitation are:22–24 and quasi-70 yr over the North China Plain; 32–36, 44–48, and quasi-70 yr in the Jiang–Huai area; and 32–36and 44–48 yr in the Jiang–Nan area. Bandpass decomposition from observation, reconstruction, and simulation reveals that the variability of summer precipitation over the North China Plain, Jiang–Huai area, and Jiang–Nan area, at scales of 20–35, 35–50, and 50–80 yr, is not consistent across the entire millennium. We also find that the warm(cold) phase of the Pacific Decadal Oscillation generally corresponds to dry(wet) conditions over the North China Plain, but wet(dry) conditions in the Jiang–Nan area, from A.D. 1800, when the PDO became strengthened.However, such a correspondence does not exist throughout the entire last millennium. Data–model comparison suggests that these decadal oscillations and their temporal evolution over eastern China, including the decadal shifts in the spatial pattern of the precipitation anomaly observed in the late 1970s, early 1990s, and early 2000s, might result from internal variability of the climate system. | Jingyun ZHENG Maowei WU Quansheng GE Zhixin HAO Xuezhen ZHANG | 2017 | Journal of Meteorological Research2017，31，1： | 6 |
| 20 | Plant microremains provide direct evidence for the functions of stone knives from the Lajia site, northwestern China显示文摘A large number of stone knives have been recovered from Neolithic archaeological sites in East Asia.However, direct evidence regarding the functions of the stone knives has been scarce, and hence, their functions have remained controversial. In this study, we recovered and analysed ancient starch grains and phytoliths from residues adhering to stone knives excavated from the Lajia site, Qinghai Province, northwest China, thus providing direct evidence for the functions of the knives. Our analyses were based on the following:(1) an assemblage of 278identifiable starch grains, representing grains from the stems of foxtail millet(Setaria italica) and broomcorn millet(Panicum miliaceum)(65.1 % of the total) and the stems of Hordeum and Triticum species(3.6 % of the total), and(2) an assemblage of 361 identifiable phytoliths,the majority of which were from the stems and leaves of plants such as Panicoideae and related taxa(96 % of the total). Our study demonstrates that one of the functions of the stone knives was the harvesting crops. In addition, a few starch grains from food legumes and roots(3.4 % of the total) indicate that the stone knives were also likely used to process, peel and cut some foods. | Zhikun Ma Quan Li Xiujia Huan Xiaoyan Yang Jingyun Zheng Maolin Ye | 2014 | Chinese Science Bulletin2014，59，11： | 5 |
您所在的机构暂未开通此部分的功能，请联系管理员