基于美国台风预报系统(Hurricane Weather Research and Forecasting,HWRF),研究了气团订正方法对GOES-13/15静止卫星成像仪资料同化效果的改进作用,选取了2012年6月23日生成于大西洋地区的台风Debby作为研究对象,通过一组对照试验比较...基于美国台风预报系统(Hurricane Weather Research and Forecasting,HWRF),研究了气团订正方法对GOES-13/15静止卫星成像仪资料同化效果的改进作用,选取了2012年6月23日生成于大西洋地区的台风Debby作为研究对象,通过一组对照试验比较了气团订正前后台风路径和初始场相关物理量的差异,结果表明:气团订正能显著减小GOES-13/15静止卫星成像仪资料的系统偏差,明显提高台风路径的预报效果,气团订正使得预报的台风路径与观测路径的平均偏差和标准差降低了30%左右,提前6 h实现了台风路径的正确转向。物理机制分析表明,经过气团订正后的静止卫星资料增强了位于台风东南侧副热带高压的强度,同时增加了台风东部的温度和比湿,在引导气流和大气温、湿场的共同作用下,台风预报路径实现了正确转向。展开更多
An effective improvement on the empirical orthogonal function(EOF)–based bias correctionmethod for seasonal forecasts is proposed in this paper,by introducing a stepwise regression method into the process of EOF time...An effective improvement on the empirical orthogonal function(EOF)–based bias correctionmethod for seasonal forecasts is proposed in this paper,by introducing a stepwise regression method into the process of EOF time series correction.Using 30-year(1981–2010)hindcast results from IAP AGCM4.1(the latest version of this model),the improved method is validated for the prediction of summer(June–July–August)rainfall anomalies in Southeast China.The results in terms of the pattern correction coefficient(PCC)of rainfall anomalies shows that the 30-year-averaged prediction skill improves from 0.01 to 0.06 with the original correction method,and to 0.29 using the improved method.The applicability in real-time prediction is also investigated,using 2016 summer rainfall prediction as a test case.With a PCC of 0.59,the authors find that the new correction method significantly improves the prediction skill;the PCC using the direct prediction of the model is?0.04,and using the old bias correction method it is 0.37.展开更多
A 33×33 thermo-optically tunable arrayed-waveguide-grating (AWG) has been fabricated by using the poly (2,3,4,5,6-pentafluorostyrene-co-glycidylmethacrylate) (PFS-co-GMA).The technological process of the fabricat...A 33×33 thermo-optically tunable arrayed-waveguide-grating (AWG) has been fabricated by using the poly (2,3,4,5,6-pentafluorostyrene-co-glycidylmethacrylate) (PFS-co-GMA).The technological process of the fabrication of the device is described,and the measured results are presented.The measured spacing of the wavelength channel is about 0.81 nm,the 3-dB bandwidth is about 0.35 nm,the crosstalk is about -20 dB,and the insertion loss is between 10.4 dB for the centre port and 11.9 dB for the edge port.The measured thermo-optical tunable shift is about -0.12 nm/K.The measured center wavelength is 1 545.21-1 551.81 nm in the temperature range from 10℃ to 65℃,and the tuning range is 6.6 nm.展开更多
Compared with traditional magnetic induction tomography (MIT) system, the innovation of this paper is that the function of voice broadcast based on WT588D module is added to the system. The new MIT system avoids frequ...Compared with traditional magnetic induction tomography (MIT) system, the innovation of this paper is that the function of voice broadcast based on WT588D module is added to the system. The new MIT system avoids frequently looking into the instrument and decreases sartificially reading residual from the hardware debugging to the test process. It makes the process of data acquisition easier and enhances the accuracy and efficiency of detection in the system. It also gives a detailed description to optimize the design of software and hardware. The voice broadcast subsystem has the advantages of simple integral structure, high quality sound, low cost, convenient function expansion, which can be used as a template based on the WT588D modular applied in other related fields.展开更多
文摘基于美国台风预报系统(Hurricane Weather Research and Forecasting,HWRF),研究了气团订正方法对GOES-13/15静止卫星成像仪资料同化效果的改进作用,选取了2012年6月23日生成于大西洋地区的台风Debby作为研究对象,通过一组对照试验比较了气团订正前后台风路径和初始场相关物理量的差异,结果表明:气团订正能显著减小GOES-13/15静止卫星成像仪资料的系统偏差,明显提高台风路径的预报效果,气团订正使得预报的台风路径与观测路径的平均偏差和标准差降低了30%左右,提前6 h实现了台风路径的正确转向。物理机制分析表明,经过气团订正后的静止卫星资料增强了位于台风东南侧副热带高压的强度,同时增加了台风东部的温度和比湿,在引导气流和大气温、湿场的共同作用下,台风预报路径实现了正确转向。
基金jointly supported by the National Key Research and Development Program of China [grant number2016YFC0402702]the Key Project of the Meteorological Public Welfare Research Program [grant number GYHY201406021]the National Natural Science Foundation of China [grant numbers 41575095 and 41661144032]
文摘An effective improvement on the empirical orthogonal function(EOF)–based bias correctionmethod for seasonal forecasts is proposed in this paper,by introducing a stepwise regression method into the process of EOF time series correction.Using 30-year(1981–2010)hindcast results from IAP AGCM4.1(the latest version of this model),the improved method is validated for the prediction of summer(June–July–August)rainfall anomalies in Southeast China.The results in terms of the pattern correction coefficient(PCC)of rainfall anomalies shows that the 30-year-averaged prediction skill improves from 0.01 to 0.06 with the original correction method,and to 0.29 using the improved method.The applicability in real-time prediction is also investigated,using 2016 summer rainfall prediction as a test case.With a PCC of 0.59,the authors find that the new correction method significantly improves the prediction skill;the PCC using the direct prediction of the model is?0.04,and using the old bias correction method it is 0.37.
文摘A 33×33 thermo-optically tunable arrayed-waveguide-grating (AWG) has been fabricated by using the poly (2,3,4,5,6-pentafluorostyrene-co-glycidylmethacrylate) (PFS-co-GMA).The technological process of the fabrication of the device is described,and the measured results are presented.The measured spacing of the wavelength channel is about 0.81 nm,the 3-dB bandwidth is about 0.35 nm,the crosstalk is about -20 dB,and the insertion loss is between 10.4 dB for the centre port and 11.9 dB for the edge port.The measured thermo-optical tunable shift is about -0.12 nm/K.The measured center wavelength is 1 545.21-1 551.81 nm in the temperature range from 10℃ to 65℃,and the tuning range is 6.6 nm.
文摘Compared with traditional magnetic induction tomography (MIT) system, the innovation of this paper is that the function of voice broadcast based on WT588D module is added to the system. The new MIT system avoids frequently looking into the instrument and decreases sartificially reading residual from the hardware debugging to the test process. It makes the process of data acquisition easier and enhances the accuracy and efficiency of detection in the system. It also gives a detailed description to optimize the design of software and hardware. The voice broadcast subsystem has the advantages of simple integral structure, high quality sound, low cost, convenient function expansion, which can be used as a template based on the WT588D modular applied in other related fields.
