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Search Results: 1 - 10 of 4301 matches for " QIAO Yunting "
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华南秋旱的大气环流异常特征
简茂球 JIAN Maoqiu,乔云亭 QIAO Yunting
大气科学 , 2012, DOI: 10.3878/j.issn.1006-9895.2012.01.16
Abstract: 利用实测降水量资料及NCEP再分析资料,通过统计方法分析了华南秋旱及其相关的环流异常特征。结果发现,华南秋旱以全区性的干旱出现居多。华南秋旱事件对应的同期海温异常分布型大致可分两类。一类是热带中东太平洋的负海表温度距平(SSTA)区的极值中心位于赤道东太平洋,在海洋性大陆和热带西太平洋有马蹄形的正SSTA,而在热带西印度洋,南海至日本东、南部西北太平洋是负SSTA;另一类是热带中东太平洋正SSTA极值中心位于赤道中太平洋,热带—副热带西太平洋、南海和热带印度洋为负SSTA区,副热带北太平洋东部和南太平洋东部为显著的正SSTA。与第一类SSTA相关的华南秋旱与海洋性大陆区域上空的上升运动异常增强(与其下垫面海温异常偏暖有关)。而与第二类SSTA相关的华南秋旱则与中纬度环流的长波调整造成的东北亚上空的异常上升运动距平有关。而两类华南秋旱都是通过大气环流对华南地区的异常下沉运动产生强迫作用而产生的。另外,华南秋旱还与菲律宾和台湾东侧洋面上空出现上升运动距平有关。两类华南秋旱都与南海中北部热带气旋频数偏少,菲律宾和台湾东侧热带气旋频数偏多有关,因此,使得登陆华南的热带气旋偏少,导致华南秋季干旱。
The Impact of Atmospheric Heat Sources over the Eastern Tibetan Plateau and the Tropical Western Pacific on the Summer Rainfall over the Yangtze-River Basin
JIAN Maoqiu,QIAO Yunting,YUAN Zhuojian,LUO Huibang,
JIAN Maoqiu
,QIAO Yunting,YUAN Zhuojian,LUO Huibang

大气科学进展 , 2006,
Abstract: The variability of the summer rainfall over China is analyzed using the EOF procedure with a new parameter (namely, mode station variance percentage) based on 1951-2000 summer rainfall data from 160 stations in China. Compared with mode variance friction, the mode station variance percentage not only reveals more localized characteristics of the variability of the summer rainfall, but also helps to distinguish the regions with a high degree of dominant EOF modes representing the analyzed observational variable.The atmospheric circulation diagnostic studies with the NCEP/NCAR reanalysis daily data from 1966 to 2000 show that in summer, abundant (scarce) rainfall in the belt-area from the upper-middle reaches of the Yangtze River northeastward to the Huaihe River basin is linked to strong (weak) heat sources over the eastern Tibetan Plateau, while the abundant (scarce) rainfall in the area to the south of the middle-lower reaches of the Yangtze River is closely linked to the weak (strong) heat sources over the tropical western Pacific.
Characteristics of General Circulation Anomalies Related to the Drought Events in Fall in South China
华南秋旱的大气环流异常特征

JIAN Maoqiu,QIAO Yunting,
简茂球
,乔云亭

大气科学 , 2012,
Abstract: 利用实测降水量资料及NCEP再分析资料, 通过统计方法分析了华南秋旱及其相关的环流异常特征。结果发现, 华南秋旱以全区性的干旱出现居多。华南秋旱事件对应的同期海温异常分布型大致可分两类。一类是热带中东太平洋的负海表温度距平 (SSTA) 区的极值中心位于赤道东太平洋, 在海洋性大陆和热带西太平洋有马蹄形的正SSTA, 而在热带西印度洋, 南海至日本东、 南部西北太平洋是负SSTA; 另一类是热带中东太平洋正SSTA极值中心位于赤道中太平洋, 热带—副热带西太平洋、 南海和热带印度洋为负SSTA区, 副热带北太平洋东部和南太平洋东部为显著的正SSTA。 与第一类SSTA相关的华南秋旱与海洋性大陆区域上空的上升运动异常增强 (与其下垫面海温异常偏暖有关)。而与第二类SSTA相关的华南秋旱则与中纬度环流的长波调整造成的东北亚上空的异常上升运动距平有关。而两类华南秋旱都是通过大气环流对华南地区的异常下沉运动产生强迫作用而产生的。另外, 华南秋旱还与菲律宾和台湾东侧洋面上空出现上升运动距平有关。两类华南秋旱都与南海中北部热带气旋频数偏少, 菲律宾和台湾东侧热带气旋频数偏多有关, 因此, 使得登陆华南的热带气旋偏少, 导致华南秋季干旱。
The Definition of East Asian Monsoon Indices and Their Relationship to Climate in China
东亚季风指数的定义及其与中国气候的关系

Qiao Yunting,Chen Lieting,Zhang Qingyun,
乔云亭
,陈烈庭,张庆云

大气科学 , 2002,
Abstract: A set of new East Asian monsoon indices (EAMI), on the basis of objectively selecting the area defined, have been defined by using the 850 hPa u and v component data reanalyzed by NCAR / NCEP for the period of 1968-1997. Their relationship to each other, seasonal and interannual variability is studied. This set of monsoon indices include the southwest monsoon indices Asw and Sw, southeast monsoon indices A SE and ISE, and north monsoon indices A N and IN, in which A and J in. dicate the area and intensity. The EAMI successfully depict the variability of the southwest monsoon, the southeast monsoon and the north monsoon over China. They have both the relationship and some independence to each other and show considerably seasonal and interannual variability. Further, we analyze the relationship between the EAMI and summer rainfall and winter air temperature in China to evaluate the EAMI's ability in explaining the distribution of climatic anomalies there. The results show that the EAMI corresponds wi th summer rainfall and winter air temperature over China in distinctive patterns. Especially, there is an obvious difference in the effect on summer rainfall anomaly in China be-tween the southwest and southeast monsoons. Therefore, we may point out that it is necessary to distin-guish the southwest monsoon from the southeast monsoon when studying the East Asian summer mon-soon. A single index is not enough to characterize their different variability.
The Abrupt Change of the Circulation in Low-Latitudes During the Period From April to June
南海夏季风爆发前后低纬大气环流突变特征

Jian Maoqiu,Qiao Yunting,Luo Huibang,
简茂球
,乔云亭,罗会邦

气候与环境研究 , 2000,
Abstract: 利用1982~1996年15年平均的NCEP再分析资料,研究南海夏季风爆发前后低纬大气环流的突变特征。结果表明,东南亚地区对流层中上层厚度(温度)场、高低风场和大气层顶净辐射加热率(QRT)都有突变发生。海温场的变化相对其他要素较为缓慢,但也存在明显的转折点。QRT突变最早,其次是海温场变化出现明显转折,再是厚度(温度)场、低层风场突变,高层风场的突变最迟;低层风场突变最快,其次是厚度(温度)场,最后是QRT和高层风场。南海地区的降水,水汽场的突变发生在南海夏季风爆发前,而且突变较快。
东亚季风指数的定义及其与中国气候的关系
乔云亭 Qiao Yunting,陈烈庭 Chen Lieting,张庆云 Zhang Qingyun
大气科学 , 2002, DOI: 10.3878/j.issn.1006-9895.2002.01.07
Abstract: 利用NCEP/NCAR850hPa月平均风场再分析资料,在客观地选定定义地区范围的基础上;定义了一组新的东亚季风指数:西南季风面积和强度指数,东南季风面积和强度指数,偏北季风面积和强度指数.研究了各季风指数的相互关系、季节变化和年际变异.这6个东亚季风指数突出反映了东亚西南季风、东南季风及偏北季风3支季风气流强度和范围变化的特征.分析表明,它们相互之间既有一定联系,又有独立性.各季风指数存在明显的季节变化和年际变化.另外,分析了各季风指数与中国夏季降水和冬季气温的联系,以考察其解释我国气候异常分布的能力.结果表明,这些指数与我国夏季降水和冬季气温有很好的关系,并各自对应有一定的降水和气温分布.特别是西南季风与东南季风影响我国夏季降水的地区有很大差异.因此,我们指出,研究东亚夏季风时,区别西南季风与东南季风是很有必要的,用单一指数不足以表征它们不同的变化.
湖南冬季降水的年代际突变及其影响因子
Interdecadal change of winter rainfall over Hunan and its physical factors

赵杰,乔云亭,王超
ZHAO Jie
,QIAO Yunting,WANG Chao

- , 2016, DOI: 10.13471/j.cnki.acta.snus.2016.02.024
Abstract: 利用1960-2010年湖南20个测站的降水资料,采用经验正交函数分解(EOF)等方法分析了湖南冬季降水的年代际变化特征及其影响因子。结果表明:1973-2009年湖南冬季降水经历了两次年代际突变,分别出现在1988和1998年。1973-1987年湖南冬季降水偏少,1988-1997年降水偏多,1998-2009年降水再次偏少。湖南降水的年代际变化与西伯利亚高压、北极涛动(AO)、东亚西风急流和欧亚遥相关型年代际变化的协同作用有关。西伯利亚高压偏弱、AO指数偏强、东亚西风急流偏弱以及欧亚遥相关型为负位相这些因子的共同作用导致1988-1997年期间湖南冬季降水偏多。而1973-1987年和1998-2009年,湖南冬季降水偏少时期,上述影响因子的变化则基本相反
Reproductive Biology of Ficus beipeiensis  [PDF]
Hongping Deng, Yunting Li, Long Chen, Shaohu Tang
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.618286
Abstract: This paper uses morphological, anatomical and ecological methods to study the morphological characteristics and propagation mechanism of Ficus beipeiensis S.S Chang which is endemic to China, providing a scientific basis for the rare population of wild plants and repopulation. The following results were obtained. First, F. beipeiensis with pollinating fig wasps was highly adapted in morphological structure and behavior. Second, a monoclinous flower period existed during the developmental phase of male flowers. F. beipeiensis had one to four stamens and one pistil. The pistil in the stigma of syconium flowers was similar to that of gall flowers, but no pollinating fig wasps that laid eggs in the ovary were found. Third, wild individual specimens were found to be rare. The investigation found only one male and four female individuals among them. However, only two female plants can bear fruits. The remaining 9 female plants were cultivated, among which only four grew syconia. No fruit, seed germination, and seeding were found under natural conditions. Several possible reasons for the growth of rare wild plants can be found as following: 1) An imbalance between male and female plants reduces breeding efficiency; 2) Ceratosolen sp. is a species-specific pollinator of F. beipeiensis, so the gall rate is lower; 3) The high mortality of Ceratosolen sp. results in low pollination rate; 4) The seed rate [25.64% ± 54.13% (N = 50)] is lower, ranging from 2% to 70%; 5) Seed germination is difficult under natural conditions.
Micro bubble formation and bubble dissolution in domestic wet central heating systems
Fsadni Andrew M.,Ge Yunting
EPJ Web of Conferences , 2012, DOI: 10.1051/epjconf/20122501016
Abstract: 16 % of the carbon dioxide emissions in the UK are known to originate from wet domestic central heating systems. Contemporary systems make use of very efficient boilers known as condensing boilers that could result in efficiencies in the 90-100% range. However, research and development into the phenomenon of micro bubbles in such systems has been practically non-existent. In fact, such systems normally incorporate a passive deaerator that is installed as a ‘default’ feature with no real knowledge as to the micro bubble characteristics and their effect on such systems. High saturation ratios are known to occur due to the widespread use of untreated tap water in such systems and due to the inevitable leakage of air into the closed loop circulation system during the daily thermal cycling. The high temperatures at the boiler wall result in super saturation conditions which consequently lead to micro bubble nucleation and detachment, leading to bubbly two phase flow. Experiments have been done on a test rig incorporating a typical 19 kW domestic gas fired boiler to determine the expected saturation ratios and bubble production and dissolution rates in such systems.
An Algorithm to Find the Optimal Matching in Halin Graphs
Yunting Lu,Yueping Li,Dingjun Lou
IAENG International Journal of Computer Science , 2007,
Abstract:
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