CAJ | 학술논문

搭载于风云三号A星和B星上的红外分光计（IRAS）分别于2008年5月27日和2010年11月5日成功发射。该仪器主要提供从可见光到红外波长范围内多通道的辐射观测，并可应用于资料同化、全球大气温度和水汽廓线反演等领域。搭载于风云三号A星上的IRAS由于滤光轮转速不稳定，导致仪器观测不连续。风云三号B星上的IRAS运行正常，处于稳定的业务模式。利用仪器在轨3个月期间的资料，进行了一系列的在轨定标和验证试验，对IRAS仪器的性能进行了一系列的验证，包括冷空和暖黑体定标计数值的长期趋势、噪音等效辐射率等。利用IRAS和红外大气探测干涉仪（IASI）同时观察到的地球场景进行比较，证明了两种观测非常相似。另外，将FY3B/IRAS红外通道的观测与NOAA-19/HIRS对应的通道的辐射传输模式模拟进行了对比。对比结果显示相对于HIRS，部分IRAS红外通道，尤其是通道1到10，15，19和20偏差很小。但是少数通道，如通道13，16和18有较大的偏差。造成这些偏差的原因仍需要进一步的研究。
탑재우풍운삼호A성화B성상적홍외분광계（IRAS）분별우2008년5월27일화2010년11월5일성공발사。해의기주요제공종가견광도홍외파장범위내다통도적복사관측，병가응용우자료동화、전구대기온도화수기곽선반연등영역。탑재우풍운삼호A성상적IRAS유우려광륜전속불은정，도치의기관측불련속。풍운삼호B성상적IRAS운행정상，처우은정적업무모식。이용의기재궤3개월기간적자료，진행료일계렬적재궤정표화험증시험，대IRAS의기적성능진행료일계렬적험증，포괄랭공화난흑체정표계수치적장기추세、조음등효복사솔등。이용IRAS화홍외대기탐측간섭의（IASI）동시관찰도적지구장경진행비교，증명료량충관측비상상사。령외，장FY3B/IRAS홍외통도적관측여NOAA-19/HIRS대응적통도적복사전수모식모의진행료대비。대비결과현시상대우HIRS，부분IRAS홍외통도，우기시통도1도10，15，19화20편차흔소。단시소수통도，여통도13，16화18유교대적편차。조성저사편차적원인잉수요진일보적연구。
InfraRed Atmospheric Sounder (IRAS) instruments were successfully launched onboard the FengYun-3A (FY3A) and FengYun-3B (FY3B) satellites on May 27, 2008, and November 5, 2010, respectively. They aim at providing multichannel radiances within the spectral range of visible to infrared (IR) wavelengths for many environmental applications, including data assimilation and retrievals of global atmospheric temperature and humidity proifles. However, the velocity of the iflter wheel of the ifrst IRAS onboard FY3A is unstable and, therefore, induced a discontinuity in the measurement. The IRAS onboard FY3B works well in normal and stable operational mode since its launch without any anomaly. A variety of postlaunch calibration/validation tasks are conducted using on-orbit data during a period of three months. This paper presents on-orbit veriifcation of IRAS instrument performance, including long-term trends of the space and warm calibration counts and noise equivalent delta radiance. The Earth scenes observed simultaneously by IRAS and Meteorological Operational Satellite Programme (METOP)/Infrared Atmospheric Sounding Interferometer were obtained and compared to demonstrate a close similarity between the two measurements. Furthermore, the IR channel observations from FY3B/IRAS are compared with those from National Oceanic and Atmospheric Administration-19/High Resolution Infrared Radiation Sounder (HIRS) equivalent channels and simulations from a radiative transfer model. The results show that some of IRAS IR channels perform very well, particularly for channels 1-10, 15, 19, and 20, compared to those of HIRS. Several channels, such as 13, 16, and 18, however, display some large biases. The causes of these increased biases are still under investigation.