Comparison Between GAMIL, and CAM2 on Interannual Variability Simulation     

杨军丽  王斌  郭裕福  万慧  季仲贞 《大气科学进展》2007,24(1):82-88

Recently, a new atmospheric general circulation model （GAMIL： Grid-point Atmospheric Model of IAP LASG） has been developed at the Institute of Atmospheric Physics （IAP）, Chinese Academy of Sciences （CAS）, which is based on the Community Atmospheric Model Version 2 （CAM2） of the National Center for Atmospheric Research （NCAR）. Since the two models have the same physical processes but different dynamical cores, the interannual variability simulation performances of the two models are compared. The ensemble approach is used to reduce model internal variability. In general, the simulation performances of the two models are similar. Both models have good per- formance in simulating total space-time variability and the Southern Oscillation Index. GAMIL performs better in the Eastern Asian winter circulation simulation than CAM2, and the model internal variability of GAMIL has a better response to external forcing than that of CAM2. These indicate that the improvement of the dynamic core is very important. It is also verified that there is less predictability in the middle and high latitudes than in the low latitudes.  相似文献   

鄂东南铁山铁铜矿床成矿流体特征及铁的迁移与沉淀富集机制     

王伟  王敏芳  刘坤  魏克涛  柯于富 《地质通报》2018,37(6):1125-1141

对铁山铁铜矿床的流体包裹体研究发现,在石榴子石和透闪石中主要发育气液两相富液相、富气相和含石盐子晶三相包裹体。显微测温结果表明,进矽卡岩阶段热液流体均一温度为499.2~594.8℃,盐度多集中分布在17.3%_(Na Cl)~19.5%_(Na Cl)之间,密度为0.45~0.62g/cm~3,形成压力为58.0~90.6MPa;退化蚀变阶段成矿流体均一温度为356.2~428.6℃,盐度多集中分布在7.2%_(Na Cl)~15.5%_(Na Cl)之间,密度为0.52~0.83g/cm~3,成矿压力为23.8~29.7MPa,成矿深度为0.90~1.12km,主成矿阶段成矿流体具有高温、中-低盐度、低密度、较低成矿压力的特征,属于浅成矽卡岩型铁铜矿床。同时,群体包裹体气液相成分结果显示,气相成分以H_2O和CO_2为主,并含有少量CH_4、C_2H_6、N_2和H_2S气体;液相成分阳离子以Na~+、Ca~(2+)、K~+为主,阴离子以SO_4~(2-)、Cl~-为主。研究表明,Cl~-、SO_4~(2-)和碳酸络合物在铁质搬运与富集过程中发挥了重要作用,流体混合和成矿热液p H值的系统演变可能是导致铁山铁铜矿床铁质超常富集沉淀的重要机制。  相似文献   

川南普格玄武岩中沥青质杏仁体的矿物学与成因     

张良钜  阮青锋  杨育富  李东升  曾伟来 《高校地质学报》2020,26(6):628-638

川南普格玄武岩顶部发育了一系列杏仁体,沥青、绿泥石、石英、自然铜等矿物以各种产状出现在杏仁体中。系统的矿物学研究表明：杏仁体中的绿泥石为辉绿泥石,形成于中—高温富有机质成矿热液环境;沥青属于石油沥青,有机质来源于下伏地层的中二叠统阳新组（P2 y）生物碎屑灰岩;绿泥石、沥青、石英及自然铜等矿物是玄武岩成岩后的构造应力与晚期基性火山活动共同作用形成的含有机质成矿热液演化的结果,其形成过程为：玄武质岩浆末期（基性岩浆作用末期）→含铜的火山热液(火山热液作用）→构造应力→含有机质的成矿热液→绿泥石→第一世代沥青→乳白色石英→烟灰色石英、第二世代沥青、自然铜→辉铜矿→葡萄石。玄武岩中含沥青的杏仁体、晶洞以及构造破碎带可以作为该地区的铜矿化的重要找矿标志。  相似文献   

温室效应引起的东亚区域气候变化   总被引：16，自引：2，他引：14  

陈起英  俞永强  郭裕福  张学洪 《气候与环境研究》1996,1(2):113-123

用中国科学院大气物理研究所的两层大气和二十层大洋环流模式耦合的海气模式进行了控制试验和瞬变响应试验两个长期积分,并用它们的差异来分析大气中二氧化碳含量加倍所引起的东亚区域的气候变化。二氧化碳加倍以后,东亚年平均温度升高,降水增加,土壤湿度也是增加的,但存在着显著的季节性和区域性的差异。因此,又把东亚分成８个区,来详细探讨二氧化碳增加所引起的区域气候变化。选取了３个具有代表性的气候量：温度、降水和土壤湿度。二氧化碳加倍以后,温度的增加和土壤湿度的增加主要出现在冬半年的高纬度,降水增加的最大值也出现在冬半年的高纬度。另外,还初步分析了二氧化碳浓度加倍所引起的温度和降水年际变率的变化  相似文献   

中国科学院大气物理研究所短期气候预测系统的改进及其对1998年全国汛期旱涝形势的预测   总被引：35，自引：9，他引：26  

林朝晖  李旭  赵彦  周广庆  王会军  袁重光  郭裕福  曾庆存 《气候与环境研究》1998,3(4):339-348

通过引入改善了地表反照率参数化方案的中国科学院大气物理研究所（ＩＡＰ）大气环流模式,我们对ＩＡＰ短期气候距平预测系统（ＩＡＰＰＳＳＣＡ）中的大气模式部分进行了改进。利用改进前后的ＩＡＰＰＳＳＣＡ,我们对１９８０～１９９４共１５年中国夏季降水异常进行了集合预报检验,与实测结果比较表明,改进后的ＩＡＰＰＳＳＣＡ对江淮和华南地区的预报技巧与原先的系统相比只是有略微的提高,但对我国东北、华北、河套区域以及整个中国东部的预报技巧则比原系统有较大程度的提高,从而表明气候模式中陆面过程的正确表述可以提高模式气候预测的能力。利用改进的ＩＡＰＰＳＳＣＡ和ＩＡＰＥＮＳＯ预测系统提供的预测海温距平,我们对１９９８年中国夏季降水异常进行了预报（该预测３月份提供给有关单位）。今与实际情况比较表明,改进了的ＩＡＰＰＳＳＣＡ和ＩＡＰＥＮＳＯ预测系统耦合,对１９９８我国夏季旱涝形势的预测与实测基本相符,但强度较小,说明有一定预报能力,但也还有许多问题。  相似文献   

区域多维贫困测量的理论与方法   总被引：12，自引：4，他引：8  

李寻欢  周扬  陈玉福 《地理学报》2020,75(4):753-768

贫困包括区域贫困和个体贫困,两者均具有多维属性。区域多维贫困是贫困地理学研究的重要内容,深度贫困地区是区域多维贫困的集中表现,是当前和未来脱贫攻坚的贫中之贫、困中之困、坚中之坚。本文以空间贫困理论为基础,界定了贫困地域系统和区域多维贫困的概念,并探究了区域多维贫困测度指标体系与评估方法。据此,以中国334个深度贫困县为研究对象,运用BP神经网络模型和ESDA技术刻画了中国深度贫困地区的多维贫困空间格局。结果表明：① 区域多维贫困是贫困地域系统发展演化过程中“人”“地”“业”三个核心要素耦合失调的一种外在表现形式,是特定地域在生态环境劣势、经济劣势、社会福利劣势上的综合表现,包括生态贫困、经济贫困和福利贫困3个维度。② 深度贫困地区最“深”的地方在青藏高原,最“深”的短板在公共服务和基础设施。从单一维度的贫困指数来看,深度贫困地区的福利贫困指数（WPI）>经济贫困指数（EPI）>生态贫困指数（NPI）,三者平均值分别为2.77、2.66、1.89,贫困人口社会福利供给不足和公共服务短缺是深度贫困地区最突出的问题;从多维贫困指数来看,青藏高原是区域多维贫困指数（RMP）的高集聚区或热点区,生态贫困、经济贫困和福利贫困程度均显著高于其他地区。③ 区域多维贫困指数能较好地揭示特定区域的贫困状况。在地理位置偏远、生态环境极其脆弱、区域劣势突出的地区,区域贫困和个体贫困在空间上高度重叠。  相似文献   

    

Yuan Zhuojian  Wang Tongmei  He Haiyan  Luo Huibang  Guo Yufu 《大气科学进展》2000,17(4):538-554

Two numerical simulations of forced local Hadley circulation are carried out based on a linear diagnostic equation to provide an insight into the mechanisms of monsoon evolution in different monsoon regions. One simulation is for the zonal mean Hadley circulation over East Asia (from 95°E to 122.5°E), another over India (from 70°E to 85°E). With the NCEP/ NCAR re-analysis data re—processed by Chinese Academy of Science in Beijing, the former simulation displays a dominant anti—Hadley circulation pattern over East Asia at 1200 UTC May 1, 1994. The simulated circulation pattern is consistent well enough with the circulation pattern plotted directly from the data for lack of the radiation information at each level. Although the simulation over India is not as good as that over East Asia, a dominant Hadley circulation pattern is obvious as data show. Further analysis shows that the defective simulation over India is due to the presence of statically unstable condition at some grid points in the lower troposphere. This circumstance slightly violates the hydrodynamic stability criterion required by the elliptic diagnostic equation for the forced circulation. Since the simulations are reliable enough compared with the given data, the linear equation facilitates a systematic assessment of relative importance of each internally forcing process. The assessment shows that among the internal processes, the horizontal temperature advections account obviously for the Hadley (anti—Hadley) circulation over India (East Asia) at 1200 UTC May 1, 1994 in addition to the process associated with the latent heat releasing. The calculation of latent heat energy is a little bit unreliable due to the unclear cloud physics in the convection processes and the less accurate humidity data. These preliminary results are consistent with the results of previous studies which show that the feature of the seasonal warming in the upper troposphere and the corresponding processes are part of key processes closely related to the evolution of the summer monsoon over East Asia and India. This work was supported by the “ National key programme of China for developing basic science” G 1998040900 part 1, NSFC 49675264 and NSFC 49875021.  相似文献   

6 震前大气电场异常的基本特征和震例     

郝建国  潘怀文  毛国敏  张云福  唐天明  李德瑞  柳松 《地震地磁观测与研究》2000,21(4)

Possible impacts of Barents Sea ice on the Eurasian atmospheric circulation and the rainfall of East China in the beginning of summer   总被引：2，自引：1，他引：1  

WANG Ji  GUO Yufu 《大气科学进展》2004,21(4):662-674

Possible influences of the Barents Sea ice anomalies on the Eurasian atmospheric circulation and the East China precipitation distribution in the late spring and early summer (May-June) are investigated by analyzing the observational data and the output of an atmospheric general circulation model (AGCM).The study indicates that the sea ice condition of the Barents Sea from May to July may be interrelated with the atmospheric circulation of June. When there is more than average sea ice in the Barents Sea, the local geopotential height of the 500-hPa level will decrease, and the same height in the Lake Baikal and Okhotsk regions will increase and decrease respectively to form a wave-chain structure over North Eurasia.This kind of anomalous height pattern is beneficial to more precipitation in the south part of East China and less in the north.  相似文献   

Numerical Simulation of Global Temperature Change during the 20th Century with the IAP／LASG GOALS Model   总被引：1，自引：0，他引：1  

MA Xiaoyan  GUO Yufu  SHI Guangyu  YU Yongqiang 《大气科学进展》2004,21(2):227-235

The IAP/LASG GOALS coupled model is used to simulate the climate change during the 20th century using historical greenhouse gases concentrations, the mass mixing ratio of sulfate aerosols simulated by a CTM model, and reconstruction of solar variability spanning the period 1900 to 1997. Four simulations, including a control simulation and three forcing simulations, are conducted. Comparison with the observational record for the period indicates that the three forcing experiments simulate reasonable temporal and spatial distributions of the temperature change. The global warming during the 20th century is caused mainly by increasing greenhouse gas concentration especially since the late 1980s; sulfate aerosols offset a portion of the global warming and the reduction of global temperature is up to about 0.11℃ over the century; additionally, the effect of solar variability is not negligible in the simulation of climate change over the 20th century.  相似文献