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1.
在下垫面相对比较复杂的四川区域,为了解风云二号F(FY-2F)卫星相对湿度产品的可靠性,利用2013~2017年加密观测期间研究区内11个加密观测站点探空探测资料与FY-2F卫星湿度产品进行对比分析,给出了FY-2F卫星相对湿度产品的分析结果,并从偏差统计、相关系数统计等方面对比分析了二者数据间的差异。结果显示:FY-2F卫星湿度产品整体数值小于探空湿度,和探空数据间的相关系数区间为-0.16~0.64;相对偏差区间为-1.65~-0.19;相关系数变化趋势均随气压层高度变化呈线性变化趋势;FY-2F卫星产品的可靠性随着高度升高而升高。   相似文献   

2.
本文使用1979—1984年卫星云量资料,分析了赤道太平洋地区平均纬向垂直环流圈。结果表明,根据卫星获得的云量资料也可以用来分析实际的环流和探讨厄·尼诺现象的。  相似文献   

3.

分析了HDF5文件和风云三号卫星实时遥感数据结构和特点,采用HDF5文件最新的
C++Classes开发包、VC++程序设计语言,开发一种实用性较强的风云三号卫星实时遥感数据
提取方法,并介绍合成风云三号卫星中分辨率真彩色图像的方法。

  相似文献   

4.
利用1998-2012年重庆市34个站点逐时降水观测资料,分析了重庆地区高时空分辨率卫星产品(Tropical Rainfall Measuring Mission,TRMM;Climate Prediction Center morphing technique,CMORPH)和再分析资料(ECMWF Re-Analysis Interim,ERAIN;Modern-Era Retrospective Analysis for Research and Applications,MERRA;Climate Forecast System Reanalysis,CFSR;Japanese 55-year Reanalysis,JRA55)的可靠性,并进一步对卫星和再分析资料降水日变化的准确性进行了评估。结果表明,再分析数据总体上高估了重庆的日降水量。在重庆西南和东南部,TRMM比较接近观测数据。CMORPH在东北部表现最好,低估了其他地区的降水量。就降水量而言,卫星资料的结果好于再分析资料。对于日平均降水强度和降水频率,卫星资料的分布形态与观测资料差异较大,再分析资料与观测则较为一致。观测资料中降水峰值多出现在午夜,沿着西南至东北方向有滞后现象。卫星资料各降水要素(PA,PI和PF)也表现出由西南至东北方向峰值时间滞后的现象。对于不同地形特征上的降水日变化,卫星和再分析资料的表现有明显差距,尤其是在夏季山地地区,再分析资料高估了12:00-17:00(北京时)的降水。  相似文献   

5.
基于GIS空间分析和数学统计方法,利用TERRA、AQUA和NPP-VIIRS卫星数据反演了西藏日土县植被归一化指数(Normalized Difference Vegetation Index,NDVI),并对不同卫星传感器反演结果的一致性进行了检验评估。结果表明:NPP-VIIRS卫星反演的NDVI值略大于TERRA和AQUA的反演值,其估算结果与MODIS卫星估算值存在较好的相关性。NPP-VIIRS卫星可以用于西藏高原植被长势监测工作,为西藏生态文明高地建设提供更加丰富的遥感数据支撑。   相似文献   

6.
风云三号(03)批是我国第二代极轨业务气象卫星的第三个批次,由上午、下午、晨昏和降水测量四颗业务卫星组成。其中,我国首发的降水测量卫星计划装载双频降水测量雷达、微波成像仪、GNSS掩星探测仪和光学成像仪。通过仿真技术,分析风云三号降水测量卫星的功能、性能和设计指标,探讨其降水探测能力。分析表明,风云三号降水测量卫星装载的降水测量雷达从设计层面分析,与美日第二代降水测量卫星GPM搭载的降水雷达DPR性能相当;风云三号降水测量卫星的轨道设计覆盖了南、北纬50°范围内的热带和中纬地区,对影响我国区域的台风系统结构具有三维探测能力;风云三号降水测量卫星上装载的被动微波辐射计相比GPM搭载的微波成像仪增加了50~60和118GHz双氧吸收通道,对陆地弱降水反演等具有应用潜力。总之,风云三号降水测量卫星加上同星配置的其他载荷,整星的降水探测能力优于美日第二代降水测量卫星GPM。  相似文献   

7.
本文讨论了通过判读卫星数据获取用于地球物理研究的冰、雪观测资料的现状.近十年间,在为获取冰和雪的信息而对卫星资料进行分析方面取得了迅速的进展;已经得到了一系列数据集,关于冰和雪的微观特性和它们的电磁特性之间的关系目前已比过去清楚得多了;目前可以获取大量精确的由卫星导出的有关冰和雪的信息.  相似文献   

8.
杨国弘  徐建平 《气象》2003,29(4):37-39
叙述了日本和中国在GMS 5卫星停止运行后的应急对策。我国将集中接收和分发美国GOES 9卫星 ( 15 5°E)和欧洲Meteosat 5 ( 63°E)卫星资料 ;各地在FY 2卫星可工作时段也可直接接收其展宽数字资料  相似文献   

9.
华北两类灾害性云团的对比研究   总被引:1,自引:0,他引:1       下载免费PDF全文
运用卫星云图、常规资料以及数值预报分析产品,分析了1998年夏季华北地区出现的强灾害性雷暴云团和暴雨云团。结果指出:它们的形成、发展条件及移动方式,均有着显著的不同特征;卫星云图与其它资料结合,是监测和预报这两类云团的有效途径。  相似文献   

10.
计算机网络平台是风云卫星地面应用系统的重要支撑。从计算资源池、存储资源池、网络系统和管理软件等四个方面详细介绍了风云卫星地面应用系统计算机网络平台的架构和特点。计算资源池中采用了资源调度、并行计算、云计算、大数据等技术实现了计算资源的充分共享和高效使用;存储资源池采用了存储虚拟化、分布式存储等技术实现了存储资源的池化共享;采用软件定义的网络SDN技术保证了网络系统的高效与灵活;通过一体化智能运维系统及典型应用分析与优化软件对系统进行了统一管理和持续优化。实际业务运行表明该平台运行高效可靠,很好地支撑了卫星观测数据的接收、处理、存档、服务与应用以及卫星在轨管理等业务。  相似文献   

11.
Supply chain interventions, which include certification schemes and zero-deforestation commitments that aim to produce environmentally and socially beneficial outcomes, are increasingly common, but evidence of their efficacy is scarce. We quantified avoided deforestation from Brazil's zero-deforestation cattle agreements by exploiting variation in the policy's rollout and the acquisition of slaughterhouses by the agreements’ signatories from 2007 to 2015 in the Amazonian states of Mato Grosso and Pará. We found no average impact of the agreements on forest cover in the regions surrounding signatory slaughterhouses by the end of 2014. Our results show avoided deforestation of about 6% from the agreements on properties that enrolled early in the rural environmental land registry. However, forest loss increased commensurately on those properties that registered later, thus washing out the positive conservation effects from the early registrants. Our results also highlight that slaughterhouses bought plants in regions with higher deforestation both before and after the agreement, suggesting that companies are not avoiding these important hotspots. We conclude that the agreements have led to some avoided deforestation on registered properties, whose boundaries are transparent and publicly accessible, but that more robust reductions in deforestation will require additional action. The agreements could be made more effective by expanding monitoring to include all properties in the supply chain, as well as ensuring that all slaughterhouses monitor.  相似文献   

12.
霍娟 《大气科学》2018,42(5):1013-1022
本文运用CloudSat卫星上搭载的雷达探测数据和AQUA卫星搭载的辐射光谱仪探测数据,选择2007年1月至2010年12月期间,地理位置位于(15°~45°N,145°~165°E)区域内(远海)发生的云场数据开展分析,研究云的物理结构特征与其光谱辐射特性的相互关系。不同光谱波段对云物理结构变化的响应情况各有不同,首先从MODIS光谱仪22个云相关光谱波段中分析并选择出与云物理结构特征密切相关的光谱组合(包含13个波段),而后开展了这些光谱波段的云辐射特性与云物理结构特征的相互变化关系研究。统计分析表明,在外部大气、地表条件以及太阳入射辐射变化不大情况下,云的结构变化与其光谱辐射变化之间总体存在单调相关关系,物理结构变化不大的云廓线之间其光谱辐射的变化也小,反之也成立,即光谱辐射变化小的云廓线之间物理结构变化也小。从而,对于某些内部物理结构特征未知的云,利用与其光谱辐射特性相近的云结构数据可实现自身垂直结构信息的重建。基于光谱辐射相近则云物理结构很可能相近的特点,本文对未知云场的物理结构重建开展了模拟试验,试验结果表明光谱相近原则匹配物理结构的方法一定程度上能够实现云物理结构的构建,为利用被动遥感数据推测云物理结构特征研究提供参考。  相似文献   

13.
引进了广义可逆环ZIn环的概念,并研究了它们的若干性质.证明了对于Armendariz环R,R是广义可逆环当且仅当R[x]是广义可逆环;广义可逆环是2-素环,拟ZIn环在满足一定条件时是2-素环.  相似文献   

14.
再论发展方程差分格式的构造和应用   总被引:40,自引:8,他引:32  
季仲贞  王斌 《大气科学》1991,15(2):1-10
【摘 要】本文把一大类大气、海洋方程归结为一种发展方程,具体构造了若干定时间步长的显式完全平方守恒差分格式。并证明在一定条件下,这类格式也具有能量守恒、“广义能量”守恒和“平均尺度”守恒的特性,它表明这类格式具有较好的计算稳定性和省时性。文中还探讨了显式平方守恒格式与隐式平方守恒格式之间的密切联系。最后给出了令人满意的用四波的R-H波作数值检验的结果。  相似文献   

15.
In this paper, characterization of cirrus clouds are made by using data from ground based polarization lidar and radiosonde measurements over Chung-Li (24.58°N, 121.10°E), Taiwan for a period of 1999–2006. During this period, the occurrence of cirrus clouds is about 37% of the total measurement nights over the lidar site. Analysis of the measurement gives the statistical characteristics about the macrophysical properties such as occurrence height, ambient temperature, and its geometrical thickness while the microphysical properties are interpreted in terms of extinction coefficient, optical depth, effective lidar ratio and depolarization ratio. The effective lidar ratio has been retrieved by using the simulation technique of backscattered lidar signals. The effect of multiple scattering has been taken into the account by a model calculation. Summer (Jun–Aug) shows the maximum appearances of cirrus due to its formation mechanism. It is shown that tropopause cirrus clouds may occur with a probability of about 24%. These clouds are usually optically thin and having laminar in structure with some cases resembling the characteristics similar to that of polar stratospheric clouds (PSCs). The radiative properties of the cirrus clouds are also discussed in detail by the empirical equations with results show a positive feedback on any climate change.  相似文献   

16.
Measurements of absorption properties of some gases in the atmosphere were made by using CO line-tunable laser. Experimental equipment and method are briefly described. Absorption coefficients of NO, NO2, NH3, CO2 and H2O at some definite laser wavelengths are given, and variations of absorption properties with both partial and total pressures are discussed.  相似文献   

17.
The absorption properties of NO in 5.2 μm band and NO2 in 6.2 μm band are measured for some definite wavelengths by using line-tunable CO laser and long-path absorption cell. The absorption coefficients for 49 CO laser wavelengths are given and variations of absorption withpartial and total pressures are analysed. Fur-thermore, the experimental errors and the interference of water vapour with the absorption at definite laser lines are also discussed.  相似文献   

18.
Studies of entrainment across the top of the boundary layer rely to a great extent on identification of the boundary-layer top, inversion properties, entrainment-zone depth, and the temporal changes in all of these. A variety of definitions and techniques have been used to provide automated and objective estimates; however, direct comparisons between studies is made difficult by the lack of consistency in techniques. Here we compare boundary-layer depth, entrainment-zone thickness, and entrainment rate derived from several commonly used techniques applied to a common set of large-eddy simulations of the idealized, dry, convective boundary layer. We focus in particular on those techniques applicable to lidar backscatter measurements of boundary-layer structure. We find significant differences in all the quantities of interest, and further that the behaviour as functions of common scaling parameters, such as convective Richardson number, also differ, sometimes dramatically. The discretization of the possible values of some quantities imposed by the vertical grid is found to affect some of the results even when changes to model resolution does not affect the entrainment rate or scaling behaviour. This is a particular problem where entrainment parameters are derived from a single mean profile (e.g. the buoyancy-flux profile), but not where they are derived from the statistical properties of large numbers of individual profiles (e.g. the probability distribution of the local boundary-layer top at each model grid point).  相似文献   

19.
初始场作用的衰减与算子的特性   总被引:12,自引:2,他引:12  
丑纪范 《气象学报》1983,41(4):385-392
本文根据描述大气运动的原始方程的算子的性质论证了初始场影响的衰减。对研究某些实际问题来说原始方程必须简化,作者建议,在进行这样那样的简化或离散化时应注意保持算子的性质不变。  相似文献   

20.
凌汛是内蒙古黄河沿河地区频繁发生的一种气象衍生灾害, 黄河贯穿内蒙古中西部大部地区, 凌汛灾害对这些地区的社会经济发展和人民生命安全造成很大威胁。该文从凌汛灾害的基本特点、形成原因、易发时段、发生趋势预测、风险评估和防御对策等方面进行分析。研究表明:凌汛是内蒙古黄河沿河地区特有的气候特点和地理特点双重作用的一种自然灾害; 凌汛灾害只是在特定地区和黄河开河和封河的特定时段内出现; 随着全球气候变暖, 开河日期逐年提前, 封河日期逐年推后, 而流凌期的不断延长, 及气温冷暖异常波动, 增加了黄河凌汛的自然风险。针对凌汛灾害的特殊性, 结合防御现状, 应从工程性和非工程性措施两方面加强防御能力建设。  相似文献   

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