A study on the water vapor transport trend and water vapor source of the Tibetan Plateau     

Kepiao Xu  Lei Zhong  Yaoming Ma  Mijun Zou  Ziyu Huang 《Theoretical and Applied Climatology》2020,139(3):1031-1044

This study presents results of the pilot experiments made with new parametric multi-site multi-variable stochastic daily weather generator (WG) SPAGETTA. The experiments are performed for eight European regions and we focus on spatial characteristics of temperature. The WG is calibrated using the gridded weather data E-OBS. In evaluating the generator, the spatial and temporal temperature autocorrelations derived from the synthetic series were found to perfectly fit the values derived from the calibration data. Next, the WG is validated in terms of the frequency of “spatial hot days” and the annual maximum length of “spatial hot spells”. The results indicate a very good correspondence between characteristics derived from synthetic and calibration data. As part of the validation tests, the performance of the WG is compared with a regional climate model (RCM), which shows a similar performance as the generator. In a final experiment, the use of the WG for the future climate is demonstrated, the WG parameters (including the temperature autocorrelations) calibrated with the observed data are modified according to the RCM-based changes in these parameters. While analyzing synthetic series produced with the modified generator, we discuss partial impacts due to changes in individual WG parameters on the spatial hot days and spells. We show that the impacts are mainly (but not only) due to changes in temperature averages. The projected changes in temperature autocorrelations have also some impacts, larger for the spatial hot spells than for the spatial hot days. Climate change impacts on spatial hot days/spells based on the WG are compared with impacts based on the RCM, and we conclude that the differences are mainly due to simplifying assumptions adopted in our pilot experiment.  相似文献   

Development of Climate and Earth System Models in China: Past Achievements and New CMIP6 Results     

Tianjun Zhou  Ziming Chen  Liwei Zou  Xiaolong Chen  Yongqiang Yu  Bin Wang  Qing Bao  Ying Bao  Jian Cao  Bian He  Shuai Hu  Lijuan Li  Jian Li  Yanluan Lin  Libin Ma  Fangli Qiao  Xinyao Rong  Zhenya Song  Yanli Tang  Bo Wu  Tongwen Wu  Xiaoge Xin  He Zhang  Minghua Zhang 《Acta Meteorologica Sinica》2020,34(1):1-19

The Earth-Climate System Model (ECSM) is an important platform for multi-disciplinary and multi-sphere integration research, and its development is at the frontier of international geosciences, especially in the field of global change. The research and development (R&D) of ECSM in China began in the 1980s and have achieved great progress. In China, ECSMs are now mainly developed at the Chinese Academy of Sciences, ministries, and universities. Following a brief review of the development history of Chinese ECSMs, this paper summarized the technical characteristics of nine Chinese ECSMs participating in the Coupled Model Intercomparison Project Phase 6 and preliminarily assessed the basic performances of four Chinese models in simulating the global climate and the climate in East Asia. The projected changes of global precipitation and surface air temperature and the associated relationship with the equilibrium climate sensitivity under four shared socioeconomic path scenarios were also discussed. Finally, combined with the international situation, from the perspective of further improvement, eight directions were proposed for the future development of Chinese ECSMs.  相似文献   

台站闪电定位仪维护方法与技巧     

廖铭超  蒋平凡  邹哲馨 《气象研究与应用》2014,(2):84-85

通过对闪电定位仪的基本构造、日常维护、常见故障等进行分析,找出闪电定位仪维护中存在的问题,提出一些有实用价值的维护维修方法,供台站在工作中参考.  相似文献   

Climatic responses to anthropogenic groundwater exploitation: a case study of the Haihe River Basin,Northern China   总被引：5，自引：0，他引：5  

Jing Zou  Zhenghui Xie  Yan Yu  Chesheng Zhan  Qin Sun 《Climate Dynamics》2014,42(7-8):2125-2145

In this study, a groundwater exploitation scheme is incorporated into the regional climate model, RegCM4, and the climatic responses to anthropogenic alteration of groundwater are then investigated over the Haihe River Basin in Northern China where groundwater resources are overexploited. The scheme models anthropogenic groundwater exploitation and water consumption, which are further divided into agricultural irrigation, industrial use and domestic use. Four 30-year on-line exploitation simulations and one control test without exploitation are conducted using the developed model with different water demands estimated from relevant socioeconomic data. The results reveal that the groundwater exploitation and water consumption cause increasing wetting and cooling effects on the local land surface and in the lower troposphere, along with a rapidly declining groundwater table in the basin. The cooling and wetting effects also extended outside the basin, especially in the regions downwind of the prevailing westerly wind, where increased precipitation occurs. The changes in the four exploitation simulations positively relate to their different water demands and are highly non-linear. The largest changes in climatic variables usually appear in spring and summer, the time of crop growth. To gain further insights into the direct changes in land-surface variables due to groundwater exploitation regardless of the atmospheric feedbacks, three off-line simulations using the land surface model Community Land Model version 3.5 are also conducted to distinguish these direct changes on the land surface of the basin. The results indicate that the direct changes of land-surface variables respond linearly to water demand if the climatic feedbacks are not considered, while non-linear climatic feedbacks enhance the differences in the on-line exploitation simulations.  相似文献   

30-Year atmospheric temperature record derived by one-dimensional variational data assimilation of MSU/AMSU-A observations     

Fuzhong Weng  Xiaolei Zou 《Climate Dynamics》2014,43(7-8):1857-1870

In the past, satellite observations of the microwave radiation emitted from the atmosphere have been directly utilized for deriving the climate tends of vertical-layer-averaged atmospheric temperatures. This study presents the 30-year atmospheric temperature trend derived by one-dimensional variational (1D-Var) data assimilation of Microwave Sounding Unit/Advanced Microwave Sounding Unit-A (MSU/AMSU-A) observations. Firstly, the radiance measurements from MSU on board the early National Oceanic and Atmospheric Administration (NOAA)-6 to NOAA-14 and AMSU-A on board NOAA-15 to -19 have been inter-calibrated to form a fundamental climate data record. A 1D-Var method is then employed to establish the thematic climate data record of atmospheric temperature profiles that are appropriate for climate change study. Verification of the MSU/AMSU-A derived temperature profiles with collocated Global Positioning System radio occultation data confirms a reasonable good accuracy of the derived atmospheric temperature profiles in the troposphere and low stratosphere. Finally, the global climate trend of the atmospheric temperature in clear-sky conditions is deduced, showing not only a global warming in the troposphere and a cooling in the stratosphere, but also a stronger warming in the upper troposphere than in the low troposphere.  相似文献   

福建区域性暴雨过程综合强度定量化评估方法   总被引：8，自引：1，他引：7       下载免费PDF全文

邹燕  叶殿秀  林毅  刘爱鸣 《应用气象学报》2014,25(3):360-364

该文以福建省为例,探讨了区域性暴雨过程的识别方法和综合强度评估模型。采用福建省66个国家级气象观测站1961—2010年逐日降水量资料,首先在给定区域性暴雨过程识别方法的基础上,筛选出941次区域性暴雨过程;其次选取区域最大日降水量、区域最大过程降水量、区域暴雨范围和区域暴雨持续时间4项暴雨过程指标,采用百分位数方法分别确定4项指标的等级划分标准;采用相关系数法确定各指标权重,构建福建区域性暴雨过程的综合强度评估模型,并给出福建区域性暴雨过程的综合强度等级划分标准。业务服务和历史事件验证表明:采用该方法的评估结果较为合理,且与历史重大暴雨事件具有良好的一致性。  相似文献   

����ػ���ǿPPP-RTKģ���ȿ��ٹ̶������о�     

邹璇  唐卫明  施闯  刘经南 《大地测量与地球动力学》2014,34(1):78-83

?????????α??????PPP??RTK???????????????ο?????????????????????????????????????????y????CORS???????????????????????????PPP??RTK??????輸??????????????????????????????????????????????λ???????  相似文献   

���ڴ�ֱ����б�ǵ�GNSS�۲��־�ȶ����о�     

管啸  杜瑞林  马武刚  胡国庆  赵斌  聂兆生  邹舟 《大地测量与地球动力学》2014,34(4):165-171

??????????????????????????????????????б????÷??????GNSS??????????飬?????????????????????????????????????????????????仯????????????????????????????????????3 mm??1 mm?????????????????????????????????2 mm??0.2 mm??????????仯?????????о???????????????????2?仯????????????????????????????仯????????峱???????????????????????????????????????????????????????????????????????????????????????????????????????????  相似文献   

冀中坳陷深县凹陷古近系沙河街组沙一段沉积相特征   总被引：1，自引：0，他引：1       下载免费PDF全文

李先平  于兴河  李胜利  张锐锋  田建章  邹敏  李瑞军  刘玮 《古地理学报》2011,13(3):262-270

冀中坳陷深县凹陷在古近系沙河街组一段沉积时期处于填平补齐阶段,地层厚度变化大,在200～1200 m之间,沉积相研究及其分布规律长期制约着勘探工作.为此,在系统的岩心观察与精细描述的基础上,通过测井资料的分析,并结合粒度分析资料对盆地水动力环境和沉积相类型进行了探讨,共识别出3种沉积相类型:辫状河三角洲、扇三角洲和湖泊...  相似文献   

Numerical Simulation of the Rock SHPB Test with a Special Shape Striker Based on the Discrete Element Method   总被引：4，自引：3，他引：1  

Xibing Li  Yang Zou  Zilong Zhou 《Rock Mechanics and Rock Engineering》2014,47(5):1693-1709

A split Hopkinson pressure bar (SHPB) system with a special shape striker has been suggested as the test method by the International Society for Rock Mechanics (ISRM) to determine the dynamic characteristics of rock materials. In order to further verify this testing technique and microscopically reveal the dynamic responses of specimens in SHPB tests, a numerical SHPB test system was established based on particle flow code (PFC). Numerical dynamic tests under different impact velocities were conducted. Investigation of the stresses at the ends of a specimen showed that the specimen could reach stress equilibrium after several wave reverberations, and this balance could be maintained well for a certain time period after the peak stress. In addition, analyses of the reflected waves showed that there was a clear relationship between the variation of the reflected wave and the stress equilibrium state in the specimen, and the turning point of the reflected wave corresponded well with the peak stress in the specimen. Furthermore, the reflected waves can be classified into three types according to their patterns. Under certain impact velocities, the specimen deforms at a constant strain rate during the whole loading process. Finally, the influence of the micro-strength ratio ( \({{\tau_{\text{c}} } \mathord{\left/ {\vphantom {{\tau_{\text{c}} } {\sigma_{\text{c}} }}} \right. \kern-0pt} {\sigma_{\text{c}} }}\) ) and distribution pattern on the dynamic increase factor (DIF) of the strength DIF were studied, and the lateral inertia confinement and heterogeneity were found to be two important factors causing the strain rate effect for rock materials.  相似文献