新息增量法评估FY-3E/HIRAS-Ⅱ观测质量
O43; FY-3E/HIRAS-Ⅱ作为世界上第一个晨昏轨道的星载红外高光谱仪器,评估其观测资料质量对提高资料同化分析场和全球数值天气预报精度具有十分重要的作用.本文基于2021年12月-2022年1月及2022年3月共35天的HIRAS-Ⅱ观测,采用新息增量法检验了其在轨辐射观测资料质量,按陆地和洋面分别统计了O-B偏差和标准差的分布特征;进一步匹配相同时间段、相同区域的MetOp-B/IASI观测资料,使用双重差异的O-B法分析了HIRAS-Ⅱ观测资料质量,可消除偏差中辐射传输模式模拟的影响.结果表明,不论海洋还是陆地,HIRAS-Ⅱ长波与中波大部分通道的O-B平均偏差均小于0.5 K、标...
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| Published in | 红外与毫米波学报 Vol. 42; no. 6; pp. 834 - 844 |
|---|---|
| Main Authors | , |
| Format | Journal Article |
| Language | Chinese |
| Published |
南京信息工程大学 气象灾害预报预警与评估协同创新中心,江苏 南京 210044
2023
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1001-9014 |
| DOI | 10.11972/j.issn.1001-9014.2023.06.017 |
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| Abstract | O43; FY-3E/HIRAS-Ⅱ作为世界上第一个晨昏轨道的星载红外高光谱仪器,评估其观测资料质量对提高资料同化分析场和全球数值天气预报精度具有十分重要的作用.本文基于2021年12月-2022年1月及2022年3月共35天的HIRAS-Ⅱ观测,采用新息增量法检验了其在轨辐射观测资料质量,按陆地和洋面分别统计了O-B偏差和标准差的分布特征;进一步匹配相同时间段、相同区域的MetOp-B/IASI观测资料,使用双重差异的O-B法分析了HIRAS-Ⅱ观测资料质量,可消除偏差中辐射传输模式模拟的影响.结果表明,不论海洋还是陆地,HIRAS-Ⅱ长波与中波大部分通道的O-B平均偏差均小于0.5 K、标准差在1 K以内,陆地上标准差比洋面偏大(尤其是窗区通道).664～665 cm-1 CO2吸收带和1 300～1 680 cm-1 水汽吸收带,由于再分析资料的偏差引起RTTOV模拟的辐射值存在系统性误差,使得偏差较大;980～1 080 cm-1 O3 吸收带和1 300 cm-1 CH4 吸收带附近较大的偏差是由于辐射传输模式RTTOV中吸收气体浓度采用固定的气候廓线值造成的,这些波段与MetOp-B/IASI相比的double O-B偏差均趋近于0 K,说明O-B偏差主要是由于辐射传输模式模拟误差造成的,而不是仪器观测的质量低.短波大部分通道的O-B平均偏差在-2 K～2 K之间,标准差在2 K以内.1 920 cm-1附近通道由于是仪器中波与短波的交界处,采用的探测器不同造成较大的O-B偏差.2 267～2 380 cm-1较大的偏差是由于RTTOV模拟亮温时没有考虑非局地热力平衡NLTE效应的影响.波数大于2 400 cm-1的短波波段由于太阳污染使得偏差和标准差都逐渐增大.HIRAS-Ⅱ O-B偏差随扫描角存在不对称现象,使用时需要进行扫描角偏差订正. |
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| AbstractList | O43; FY-3E/HIRAS-Ⅱ作为世界上第一个晨昏轨道的星载红外高光谱仪器,评估其观测资料质量对提高资料同化分析场和全球数值天气预报精度具有十分重要的作用.本文基于2021年12月-2022年1月及2022年3月共35天的HIRAS-Ⅱ观测,采用新息增量法检验了其在轨辐射观测资料质量,按陆地和洋面分别统计了O-B偏差和标准差的分布特征;进一步匹配相同时间段、相同区域的MetOp-B/IASI观测资料,使用双重差异的O-B法分析了HIRAS-Ⅱ观测资料质量,可消除偏差中辐射传输模式模拟的影响.结果表明,不论海洋还是陆地,HIRAS-Ⅱ长波与中波大部分通道的O-B平均偏差均小于0.5 K、标准差在1 K以内,陆地上标准差比洋面偏大(尤其是窗区通道).664～665 cm-1 CO2吸收带和1 300～1 680 cm-1 水汽吸收带,由于再分析资料的偏差引起RTTOV模拟的辐射值存在系统性误差,使得偏差较大;980～1 080 cm-1 O3 吸收带和1 300 cm-1 CH4 吸收带附近较大的偏差是由于辐射传输模式RTTOV中吸收气体浓度采用固定的气候廓线值造成的,这些波段与MetOp-B/IASI相比的double O-B偏差均趋近于0 K,说明O-B偏差主要是由于辐射传输模式模拟误差造成的,而不是仪器观测的质量低.短波大部分通道的O-B平均偏差在-2 K～2 K之间,标准差在2 K以内.1 920 cm-1附近通道由于是仪器中波与短波的交界处,采用的探测器不同造成较大的O-B偏差.2 267～2 380 cm-1较大的偏差是由于RTTOV模拟亮温时没有考虑非局地热力平衡NLTE效应的影响.波数大于2 400 cm-1的短波波段由于太阳污染使得偏差和标准差都逐渐增大.HIRAS-Ⅱ O-B偏差随扫描角存在不对称现象,使用时需要进行扫描角偏差订正. |
| Abstract_FL | FY-3E/HIRAS-Ⅱ is the first early mooring orbiting infrared hyperspectral instrument in the world.Evaluating the quality of its observation data plays a very important role in improving the data assimilation and the accuracy of global numerical weather prediction.Based on the 35 days of HIRAS-Ⅱ observations from December 2021 to January 2022 and March 2022,this paper uses the innovation vector method to assess the quality of the on-orbit observation data.The dis-tribution characteristics of O-B deviation and standard deviation are calculated by land and ocean respectively.Further matching MetOp-B/IASI observation data in the same time period and in the same region,the double-difference method is used to analyze the quality of HIRAS-Ⅱ observation data,which can eliminate the influence of radiation transfer mode simulation deviation.The results show that the O-B average deviation of long wave and medium wave in most channels is less than 0.5 K,and the standard deviation is within 1 K.The standard deviation on land is larger than that on ocean(especially for window channels).Due to the deviation of ERA5 reanalysis data,the radiation value simulated by RT-TOV has a systematic error in the 664-665 cm-1 CO2 absorption band and the 1 300-1 680 cm-1 water vapor absorption band,which makes the deviation larger,and the double O-B bias in these bands compared with MetOp-B/IASI is close to 0 K,indicating that the O-B bias is mainly caused by the simulation error of the radiation transfer mode,rather than the low quality of the instrument observation.The large deviation near the 980-1 080 cm-1 O3 absorption band and the 1 300 cm-1 CH4 absorption band is caused by the use of fixed climate profile values in RTTOV.The O-B average deviation of short wave in most channels is between-2 K and 2 K,and the standard deviation is within 2 K.The channels near 1 920 cm-1 are the junction of medium wave and short wave of the instrument,so different detectors will cause large O-B devia-tion.The large deviation of 2 267-2 380 cm-1 due to the fact of the NLTE effect(Non-local Thermodynamic Equilibrium)is not taken into account when RTTOV simulates the brightness temperature.The deviation and standard deviation of channels greater than 2 400 cm-1 increase gradually due to solar pollution.HIRAS-Ⅱ O-B deviation is asymmetric with the scanning angle,so it is necessary to correct the scanning angle deviation when using HIRAS-Ⅱ data. |
| Author | 官莉 陈宏涛 |
| AuthorAffiliation | 南京信息工程大学 气象灾害预报预警与评估协同创新中心,江苏 南京 210044 |
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| Author_FL | GUAN Li CHEN Hong-Tao |
| Author_FL_xml | – sequence: 1 fullname: CHEN Hong-Tao – sequence: 2 fullname: GUAN Li |
| Author_xml | – sequence: 1 fullname: 陈宏涛 – sequence: 2 fullname: 官莉 |
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| Keywords | FY-3E/HIRAS- RTTOV innovation vector method 观测质量评估 evaluation of observation quality 新息增量法 |
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| PublicationTitle | 红外与毫米波学报 |
| PublicationTitle_FL | Journal of Infrared and Millimeter Waves |
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| Publisher | 南京信息工程大学 气象灾害预报预警与评估协同创新中心,江苏 南京 210044 |
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| Snippet | O43; FY-3E/HIRAS-Ⅱ作为世界上第一个晨昏轨道的星载红外高光谱仪器,评估其观测资料质量对提高资料同化分析场和全球数值天气预报精度具有十分重要的作用.本文基于2021年12... |
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| Title | 新息增量法评估FY-3E/HIRAS-Ⅱ观测质量 |
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