排序方式： 共有32条查询结果，搜索用时 15 毫秒
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利用西安泾河和长安的气象观测资料、陕西秦岭大气科学试验基地气溶胶粒子谱观测资料及西安市环境保护局颗粒物质量浓度观测资料,分析了气象条件对关中颗粒物粒径谱的影响,结果表明:关中特殊的地形影响和严重的颗粒物污染是霾易发的主要原因;混合层高度与PM_(2.5)质量浓度具有较明显的负相关关系,秋、冬季混合层高度高有利于颗粒物污染的扩散。不同方向上风速变化对颗粒物浓度的影响体现了西北气流对关中颗粒物污染的扩散作用和偏东气流对颗粒物污染的输送。高相对湿度有利于稳定层结的维持和污染物集聚,当相对湿度≤80%时,粒径在150nm～1.0μm的粒子的数浓度,随着相对湿度的增大明显增加,对降低能见度、形成雾-霾有重要作用。不同粒径段粒子的数浓度随相对湿度的变化不同,对能见度的影响也不同;相对湿度越大,湿度对降低能见度的贡献越大。 相似文献
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使用中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室（LASG/IAP）开发的第三代气候海洋模式（LASG/IAP Climate system Ocean Model version 3, LICOM3.0）低分辨率版本在海洋模式比较计划（Ocean Model Intercomparison Project, OMIP）试验中的模拟数据,描述了南极绕极流（Antarctic Circumpolar Current, ACC）和南大洋经向翻转环流（Meridional Overturning Circulation, MOC）在1958～2009年的平均状态及其变化,并与已有的模式模拟结果和观测结果对比以评估LICOM模式的模拟效果。通过对比已有模式模拟数据发现,LICOM3.0模式模拟的ACC和南大洋MOC在两组OMIP试验中平均状态相仿、结果在合理范围内,但OMIP1试验中海表强迫的变化趋势较OMIP2试验中的变化更大,得到的环流输送在OMIP1试验中增长趋势也更大。 相似文献
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基于GIS的气温和降水推算方法研究 总被引：6，自引：2，他引：4
针对开展乡镇天气预报对高精度逐日气象要素输入值的需求,以辽宁地区为例,选用克立格法(Kriging)、距离权重反比法(IDw)、带高度梯度订正的距离权重反比法(GIDW)及样条函数法(spline)4种插值方法,进行有限气象站点1～12月逐日气象要素空间插值方法研究并对估值进行检验.结果表明:对温度而言,GIDW方法估值精度较高,插值结果分布趋势也较为接近实际站点的分布;对降水而言.IDW估值精度高于其他插值方法,更适合于日降水量的空间插值. 相似文献
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2007年3月3-5日辽宁特大暴雪过程物理量诊断分析 总被引：10，自引：0，他引：10
通过对2007年3月3—5日辽宁历史罕见特大暴雪过程天气形势及物理量场分析,探讨了同期的天气形势特征及相关物理量场与暴雪落区的对应关系。结果表明:500 hPa阶梯槽和地面江淮气旋是此次过程的主要影响系统。对流层中低层辐合、高层辐散及来自2个源地的充沛水汽在有利环流背景下汇合并被抬升是产生暴雪天气过程的主要原因。强降雪出现在850 hPa涡度和200 hPa散度大值区内。温度平流的强弱及冷暖过渡带位置能够较好地反映出降水的强度及落区。 相似文献
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Baiyang Chen Lingling Xie Quanan Zheng Lei Zhou Lei Wang Baoxin Feng Zipeng Yu 《海洋学报(英文版)》2020,39(12):11-20
Using the mesoscale eddy trajectory atlas product derived from satellite altimeter data from 1993 to 2016, this study analyzes statistical characteristics and seasonal variability of mesoscale eddies in the Banda Sea of the Indonesian seas. The results show that there were 147 mesoscale eddies that occurred in the Banda Sea, of which 137 eddies were locally generated and 10 originated from outside. The total numbers of cyclonic eddies (CEs, clockwise) and anticyclonic eddies (AEs, anticlockwise) are 76 and 71, respectively. Seasonally, the number of CEs (AEs) is twice larger than the number of AEs (CEs) in winter (summer). In winter, CEs are distributed in the southern and AEs in the northern basins, respectively, but the opposite thing occurs in summer, i.e., the polarities of mesoscale eddies observed at the same location reverse seasonally. The mechanisms of polarity distribution reversal (PDR) of mesoscale eddies are examined with reanalysis data of ocean currents and winds. The results indicate that the basin-scale vorticity, wind stress curl, and the meridional shear of zonal current reverse seasonally, which are favorable to the PDR of mesoscale eddies. The possible generation mechanisms of mesoscale eddies include direct wind forcing, barotropic and baroclinic instabilities, of which the direct wind forcing should play the dominant role. 相似文献
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利用2016年3月至2020年2月逐时气象和PM2.5质量浓度观测资料,依据《霾的观测和预报等级（QX/T 113—2010）》（以下简称2010行标）和《霾的观测识别》（GB/T 36542—2018）(以下简称2018国标)两种标准规定的判识方法,分析了在不同标准下陕西省霾出现频率的差异。结果表明:采用2018国标判识的霾出现频率明显多于采用2010行标的霾出现频率,若均以霾现象持续6 h及以上作为判定标准,则两者得到的霾日数相当。在80%≤相对湿度<95%时,用2018国标判识的霾出现频率比采用2010行标多,湿度越大,增加越明显;气溶胶吸湿性参数对吸湿增长后气溶胶消光系数的计算影响较大,使用2018国标时应注意该参数在各地的差异。在PM2.5≤75μg·m-3时,采用2018国标仍能识别出霾,显现出湿度对能见度的影响;在PM2.5>75μg·m-3时,当空气污染达到中度及以上时,两者差异缩小。陕西省各地市霾发生频率的月变化均呈现出“冬高夏低”的“U型”分布,... 相似文献
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Yiwen LI Hailong LIU Mengrong DING Pengfei LIN Zipeng YU Yongqiang YU Yao MENG Yunlong LI Xiaodong JIAN Jinrong JIANG Kangjun CHEN Qian YANG Yaqi WANG Bowen ZHAO Jilin WEI Jinfeng MA Weipeng ZHENG Pengfei WANG 《大气科学进展》2020,37(10):1067-1080
A 61-year(1958–2018) global eddy-resolving dataset for phase 2 of the Ocean Model Intercomparison Project has been produced by the version 3 of Chinese Academy of Science, the State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics/Institute of Atmospheric Physics(LASG/IAP) Climate system Ocean Model(CAS-LICOM3). The monthly and a part of the surface daily data in this study can be accessed on the Earth System Grid Federation(ESGF) node. Besides the details of the model and experiments, the evolutions and spatial patterns of large-scale and mesoscale features are also presented. The mesoscale features are reproduced well in the high-resolution simulation, as the mesoscale activities can contribute up to 50% of the total SST variability in eddy-rich regions. Also, the large-scale circulations are remarkably improved compared with the low-resolution simulation, such as the climatological annual mean SST(the RMSE is reduced from 0.59°C to 0.47°C, globally) and the evolution of Atlantic Meridional Overturning Circulation. The preliminary evaluation also indicates that there are systematic biases in the salinity, the separation location of the western boundary currents, and the magnitude of eddy kinetic energy. All these biases are worthy of further investigation. 相似文献
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Yaqi WANG Zipeng YU Pengfei LIN Hailong LIU Jiangbo JIN Lijuan LI Yanli TANG Li DONG Kangjun CHEN Yiwen LI Qian YANG Mengrong DING Yao MENG Bowen ZHAO Jilin WEI Jinfeng MA Zhikuo SUN 《大气科学进展》2020,37(10):1093-1101
The Flux-Anomaly-Forced Model Intercomparison Project(FAFMIP) is an endorsed Model Intercomparison Project in phase 6 of the Coupled Model Intercomparison Project(CMIP6). The goal of FAFMIP is to investigate the spread in the atmosphere–ocean general circulation model projections of ocean climate change forced by increased CO_2, including the uncertainties in the simulations of ocean heat uptake, global mean sea level rise due to ocean thermal expansion and dynamic sea level change due to ocean circulation and density changes. The FAFMIP experiments have already been conducted with the Flexible Global Ocean–Atmosphere–Land System Model, gridpoint version 3.0(FGOALS-g3). The model datasets have been submitted to the Earth System Grid Federation(ESGF) node. Here, the details of the experiments,the output variables and some baseline results are presented. Compared with the preliminary results of other models, the evolutions of global mean variables can be reproduced well by FGOALS-g3. The simulations of spatial patterns are also consistent with those of other models in most regions except the North Atlantic and the Southern Ocean, indicating large uncertainties in the regional sea level projections of these two regions. 相似文献