山东兴农网信息管理系统的实现

介绍了山东兴农网站点数据维护平台的基本功能及操作流程，重点阐述了数据平台的分级权限管理、信息数据传输、收集、编辑、信息审核和信息统计等功能和实现，较完整地说明了山东兴农网网站的信息数据维护模式。     

陕西农网与农村综合信息服务

陕西农网作为气象部门为新农村建设提供综合信息服务的窗口，在构建和谐社会和社会主义新农村建设中将大有作为，更好的为陕西农业发展做好综合信息服务、科技服务和流通服务，更好地为科技兴农提供信息资源保障，促进陕西农业的发展。[第一段]     

风云卫星数据在中国农业监测中的应用进展

我国风云卫星数据很早就在农业遥感中得到了应用,第二代卫星发射之后的十年,随着卫星技术水平、卫星数据处理和分发能力的提升,风云卫星的农业遥感应用得到了快速的发展。目前我国学者利用风云卫星在作物长势监测、作物分类与面积统计和产量估算、农业气象灾害监测、草原生态监测以及数据精细化处理等方面开展了大量的研究工作,取得了一系列新的成果。未来还应充分发挥风云卫星数据的巨大的潜力,利用最新的云计算数据处理技术、基于互联网的信息服务技术,面向全球农业监测,及时、高效、准确地提供全球作物生产信息,以支撑国家的粮食安全战略和联合国的可持续发展目标。     

农村气象服务网的开发和巩固

农村气象服务网的开发和巩固梁文良，滕风晓农村气象服务网（以下简称农网），主要是以气象警报系统为载体的广播服务网络。气象部门通过该网络发布气象情报，传播农业知识和气象科技及与农业生产有关的信息，为当地农业生产防灾、减灾、抗灾夺丰收服务。农网具有辐射面宽...     

农网现状及加快陕西农网发展的设想

多年来 ,气象部门始终坚持气象服务工作的重点为农业服务 ,并取得了显著的成绩和宝贵的经验 ,为全国各地农业的防灾、减灾、夺取农业丰收做出了较大的贡献。加入 WTO后 ,我国农业面临产业结构调整 ,农业信息化进程必须加快发展 ,为了适应农业信息化进程的发展和需要 ,气象部门认识到充分利用和发挥现有的高新技术网络优势组建“农网”来推动农业信息化进程 ,是气象部门发挥部门优势 ,为农业服务的一条有效途径。由于气象部门全国卫星通信网络系统已建成 ,利用此网络系统传输农业信息 ,可以避免重复建设 ,减少农网建设的费用 ;同时 ,气象部…     

利用IPTV开展温州农村信息服务系统研究

温州市农村经济信息中心联合温州电信共同开发了农村信息IPTV系统,此系统主要利用宽带互联网,以家用电视机作为主要终端,采用“宽带 机顶盒 电视机”的模式,设计了包括农业和娱乐等频道内容的“温州市农村信息综合服务”平台。本文着重介绍此系统的技术及信息服务设计方案,给各市农网开展农业信息服务提供借鉴。     

气象科技服务着眼点应放在农村

为农业服务是气象工作服务的重点。从我国整个农村经济发展的需求来看,气象科技服务的着眼点应放在农村。黑龙江、山东等省的实践经验证明,气象科技服务在农村效益高、功能强、覆盖面大,直接面对广大农户,及时准确地开展气象信息和科技信息服务,积极推广农业气象适用技术,充分发挥当地气候资源优势。有力地推进气象为农业服务的广度和深度,从服务型转化服务经     

农业气象情报业务自动化处理系统之特色

农业气象情报业务自动化处理系统之特色钱锦霞郝智文（山西省卫星遥感减灾服务中心０３０００２）前言随着对农业气象情报业务要求的不断提高，各省根据自己不同的人力、物力等具体情况，对农业气象情报业务自动化处理系统（以下简称情报系统）进行了不同程度的研制，无论...     

系统压力测试和性能分析在气象网站中的应用

介绍B/S系统的压力和性能测试的方法,分析其架构的稳定性、可靠性。通过对浙江三农网(由浙江农网开发,平台部署在信息网络中心)、浙江气象网、浙江农网3个平台进行测试对比,阐述各平台技术架构的优劣。     

自动气象站和人工气象站气温差异特征分析

2006年5月27日,全国第一个新一代气象数据卫星接收站在山西省气象信息中心投入业务试运行,该系统采用的是D V B传输协议。DVB-S(Digital Video Broadcastby Satellite)气象数据接收站在山西省的成功安装,标志着我国新一代气象数据卫星广播系统建设工作拉开了序幕。该系统的业务化运行将大大增加气象信息的数据量,提供高质量的流媒体广播,为提高天气预报准确率和气象服务时效奠定坚实的基础。目前新系统运行一切正常。     

CHARACTERISTICS AND TRENDS OF CLIMATIC EXTREMES IN CHINA DURING 1959–2014

The spatial and temporal variations of daily maximum temperature(Tmax), daily minimum temperature(Tmin), daily maximum precipitation(Pmax) and daily maximum wind speed(WSmax) were examined in China using Mann-Kendall test and linear regression method. The results indicated that for China as a whole, Tmax, Tmin and Pmax had significant increasing trends at rates of 0.15℃ per decade, 0.45℃ per decade and 0.58 mm per decade,respectively, while WSmax had decreased significantly at 1.18 m·s~(-1) per decade during 1959—2014. In all regions of China, Tmin increased and WSmax decreased significantly. Spatially, Tmax increased significantly at most of the stations in South China(SC), northwestern North China(NC), northeastern Northeast China(NEC), eastern Northwest China(NWC) and eastern Southwest China(SWC), and the increasing trends were significant in NC, SC, NWC and SWC on the regional average. Tmin increased significantly at most of the stations in China, with notable increase in NEC, northern and southeastern NC and northwestern and eastern NWC. Pmax showed no significant trend at most of the stations in China, and on the regional average it decreased significantly in NC but increased in SC, NWC and the mid-lower Yangtze River valley(YR). WSmax decreased significantly at the vast majority of stations in China, with remarkable decrease in northern NC, northern and central YR, central and southern SC and in parts of central NEC and western NWC. With global climate change and rapidly economic development, China has become more vulnerable to climatic extremes and meteorological disasters, so more strategies of mitigation and/or adaptation of climatic extremes,such as environmentally-friendly and low-cost energy production systems and the enhancement of engineering defense measures are necessary for government and social publics.     

Revisiting the Concentration Observations and Source Apportionment of Atmospheric Ammonia

正While China’s Air Pollution Prevention and Control Action Plan on particulate matter since 2013 has reduced sulfate significantly, aerosol ammonium nitrate remains high in East China. As the high nitrate abundances are strongly linked with ammonia, reducing ammonia emissions is becoming increasingly important to improve the air quality of China. Although satellite data provide evidence of substantial increases in atmospheric ammonia concentrations over major agricultural regions, long-term surface observation of ammonia concentrations are sparse. In addition, there is still no consensus on     

LOW-FREQUENCY CIRCULATION AND EXTENDED-RANGE FORECAST IN CONNECTION WITH AUTUMN EXTREME HEAVY RAINFALL PROCESS IN HAINAN

Observed daily precipitation data from the National Meteorological Observatory in Hainan province and daily data from the National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis-2 dataset from 1981 to 2014 are used to analyze the relationship between Hainan extreme heavy rainfall processes in autumn (referred to as EHRPs) and 10–30 d low-frequency circulation. Based on the key low-frequency signals and the NCEP Climate Forecast System Version 2 (CFSv2) model forecasting products, a dynamical-statistical method is established for the extended-range forecast of EHRPs. The results suggest that EHRPs have a close relationship with the 10–30 d low-frequency oscillation of 850 hPa zonal wind over Hainan Island and to its north, and that they basically occur during the trough phase of the low-frequency oscillation of zonal wind. The latitudinal propagation of the low-frequency wave train in the middle-high latitudes and the meridional propagation of the low-frequency wave train along the coast of East Asia contribute to the ‘north high (cold), south low (warm)’ pattern near Hainan Island, which results in the zonal wind over Hainan Island and to its north reaching its trough, consequently leading to EHRPs. Considering the link between low-frequency circulation and EHRPs, a low-frequency wave train index (LWTI) is defined and adopted to forecast EHRPs by using NCEP CFSv2 forecasting products. EHRPs are predicted to occur during peak phases of LWTI with value larger than 1 for three or more consecutive forecast days. Hindcast experiments for EHRPs in 2015–2016 indicate that EHRPs can be predicted 8–24 d in advance, with an average period of validity of 16.7 d.     

AN ATTRIBUTION ANALYSIS OF CHANGES IN POTENTIAL EVAPOTRANSPIRATION IN THE BEIJING–TIANJIN–HEBEI REGION UNDER CLIMATE CHANGE

Based on the measurements obtained at 64 national meteorological stations in the Beijing–Tianjin–Hebei (BTH) region between 1970 and 2013, the potential evapotranspiration (ET0) in this region was estimated using the Penman–Monteith equation and its sensitivity to maximum temperature (Tmax), minimum temperature (Tmin), wind speed (Vw), net radiation (Rn) and water vapor pressure (Pwv) was analyzed, respectively. The results are shown as follows. (1) The climatic elements in the BTH region underwent significant changes in the study period. Vw and Rn decreased significantly, whereas Tmin, Tmax and Pwv increased considerably. (2) In the BTH region, ET0 also exhibited a significant decreasing trend, and the sensitivity of ET0 to the climatic elements exhibited seasonal characteristics. Of all the climatic elements, ET0 was most sensitive to Pwv in the fall and winter and Rn in the spring and summer. On the annual scale, ET0 was most sensitive to Pwv, followed by Rn, Vw, Tmax and Tmin. In addition, the sensitivity coefficient of ET0 with respect to Pwv had a negative value for all the areas, indicating that increases in Pwv can prevent ET0 from increasing. (3) The sensitivity of ET0 to Tmin and Tmax was significantly lower than its sensitivity to other climatic elements. However, increases in temperature can lead to changes in Pwv and Rn. The temperature should be considered the key intrinsic climatic element that has caused the "evaporation paradox" phenomenon in the BTH region.     

ANALYSIS OF “BIMODAL PATTERN” STORM ACTIVITY CHARACTERISTICS OF THE BAY OF BENGAL

Storms that occur at the Bay of Bengal (BoB) are of a bimodal pattern, which is different from that of the other sea areas. By using the NCEP, SST and JTWC data, the causes of the bimodal pattern storm activity of the BoB are diagnosed and analyzed in this paper. The result shows that the seasonal variation of general atmosphere circulation in East Asia has a regulating and controlling impact on the BoB storm activity, and the “bimodal period” of the storm activity corresponds exactly to the seasonal conversion period of atmospheric circulation. The minor wind speed of shear spring and autumn contributed to the storm, which was a crucial factor for the generation and occurrence of the “bimodal pattern” storm activity in the BoB. The analysis on sea surface temperature (SST) shows that the SSTs of all the year around in the BoB area meet the conditions required for the generation of tropical cyclones (TCs). However, the SSTs in the central area of the bay are higher than that of the surrounding areas in spring and autumn, which facilitates the occurrence of a “two-peak” storm activity pattern. The genesis potential index (GPI) quantifies and reflects the environmental conditions for the generation of the BoB storms. For GPI, the intense low-level vortex disturbance in the troposphere and high-humidity atmosphere are the sufficient conditions for storms, while large maximum wind velocity of the ground vortex radius and small vertical wind shear are the necessary conditions of storms.     

Information for Authors

正AIMS AND SCOPE Atmospheric and Oceanic Science Letters (AOSL) publishes short research letters on all disciplines of the atmosphere sciences and physical oceanography.     

Information for Authors

AIMS AND SCOPE
Atmospheric and Oceanic Science Letters （AOSL） publishes short research letters on all disciplines of the atmosphere sciences and physical oceanography. Contributions from all over the world are welcome.     

Information for Authors

AIMS AND SCOPE Atmospheric and Oceanic Science Letters （AOSL） pub- lishes short research letters on all disciplines of the atmos- phere sciences and physical oceanography. Contributions from all over the world are welcome.     

INFORMATION FOR AUTHORS

正Aims Scope Advances in Atmospheric Sciences(AAS)is an international journal on the dynamics,physics,and chemistry of the atmosphere and ocean with papers across the full range of the atmospheric sciences,co-published bimonthly by Science Press and Springer.The journal includes Articles,Note and Correspondence,and Letters.Contributions from all over the world are welcome.