CAJ | 학술논문

针对探空观测资料使用造成的某些区域 GRAPES 分析场存在虚假的高、低压系统问题，该文通过对比全球探空资料的位势高度观测与 NCEP 分析场，统计站点中观测质量较差的时次出现频数，确定探空位势高度观测黑名单。研究表明：500 hPa 在印度地区、北大西洋和南极洲附近的探空位势高度观测与 NCEP 分析场的均方根误差在30 gpm 以上的站点较多，且位势高度观测不可靠观测比率为20％以上的站点主要集中这些区域，以上观测站均列入黑名单。文中在 GRAPES 全球三维变分分析场的质量控制中加入探空位势高度观测黑名单检查，通过6 h 分析预报循环试验表明：探空位势高度观测黑名单检查能有效提高分析场质量，GRAPES 位势高度分析场在南极洲附近和印度地区有所改善。
침대탐공관측자료사용조성적모사구역 GRAPES 분석장존재허가적고、저압계통문제，해문통과대비전구탐공자료적위세고도관측여 NCEP 분석장，통계참점중관측질량교차적시차출현빈수，학정탐공위세고도관측흑명단。연구표명：500 hPa 재인도지구、북대서양화남겁주부근적탐공위세고도관측여 NCEP 분석장적균방근오차재30 gpm 이상적참점교다，차위세고도관측불가고관측비솔위20％이상적참점주요집중저사구역，이상관측참균렬입흑명단。문중재 GRAPES 전구삼유변분분석장적질량공제중가입탐공위세고도관측흑명단검사，통과6 h 분석예보순배시험표명：탐공위세고도관측흑명단검사능유효제고분석장질량，GRAPES 위세고도분석장재남겁주부근화인도지구유소개선。
The radiosonde observations are very important for the numerical weather forecasting as they are more reliable data compared to other observations in the assimilation system.The radiosonde observation needs serious quality controlling before used in data assimilation,and the blacklisting check which uses monthly blacklist to delete the abnormal noise and bias data compared with background field is a significant step in observation quality monitoring.At present the radiosonde observations used in GRAPES (Global-Regional Assimilation and PrEdiction System)analysis system are scanned through preliminary checks such as cli-matological extreme check,consistency checks and background quality control in data assimilation system, but blacklisting check is not included.For the spurious high/low-pressure system structure of GRAPES a-nalysis caused by the radiosonde observation in some region,the radiosonde observations are analyzed through comparing with NCEP analysis from June to August in 2007.Results show that the bias of radio-sonde geopotential height observation and NCEP analysis is less than 50 gpm under 100 hPa.The bias is much bigger over 100 hPa and the radiosonde geopotential height is much smaller than NCEP analysis. Stations where the root mean square errors of the geopotential height between radiosonde observations and NCEP analysis for 500 hPa exceed 30 gpm are located in India,North Atlantic Ocean and Antarctic region. In those regions the unreliable observation ratios of some stations are above 20%,so they are listed in the blacklist.The geopotential height blacklist of radiosonde is provided by comparing observations with NCEP analysis and estimating the frequency of bad observation-quality station.The geopotential height blacklisting check of radiosonde is applied to GRAPES global 3D-var analysis system,and the cycle experi-ments of the analysis and forecast from 1 July to 21 July in 2009 are carried out.Two experiments are per-formed,Experiment 1 (control test)without blacklisting check and Experiment 2 with blacklisting check. The results indicate that the quality of geopotential height analysis of GRAPES is improved in India and Antarctic regions when considering geopotential height blacklist.The average root mean square errors of geopotential height GRAPES analysis and NCEP analysis for 500 hPa is reduced by 6 gpm in India Region and near 10 gpm in Antarctic Region after using blacklisting check in the 3D-var analysis system.In Ant-arctic region,the average biases and root mean square errors of geopotential height GRAPES analysis and NCEP analysis both decrease from 1000 hPa to high levels.The blacklisting check of radiosonde observa-tion is a necessary step in the analysis system.The updated blacklist information will be used to assimilate the radiosonde observation more effectively.