| COSMIC数据验证FY-3 MWTS通道4的观测结果 |
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| 引用本文： | 何文英,陈洪滨.COSMIC数据验证FY-3 MWTS通道4的观测结果[J].地球物理学报,2017,60(4):1284-1292. |
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| 作者姓名： | 何文英 陈洪滨 |
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| 作者单位： | 中国科学院大气物理研究所中层大气和全球环境探测重点实验室, 北京 100029 |
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| 基金项目： | 北京市自然科学基金（8153039）和国家自然科学基金项目（41575033）共同资助. |
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| 摘 要： | 利用无线电掩星探测在平流层具有较高精度和稳定性的优势,本文采用COSMIC资料验证我国风云3号(FY-3)系列卫星上微波温度探测仪(MWTS)通道4表征的平流层低层测量结果.两年的FY-3A/3B上MWTS通道4观测亮温与掩星数据模拟的亮温相比较分析表明:两颗卫星平台上MWTS通道4观测亮温都偏高,尤其在热带地区和极区夏季;FY3A/3B上MWTS通道4亮温偏差的月均值变化趋势较为一致,两个年份的变化趋势也较为一致.MWTS通道4表征的平流层低层观测亮温在不同纬度带呈现不同偏差分布特征:热带地区明显系统偏高2~4 K,中纬度地区偏高1 K;而高纬度地区则出现随季节显著变化的偏差,尤其在南极地区季节差异达到5 K,这种依赖于环境温度出现的较大亮温偏差不完全是频率偏移引起.热带地区观测与模拟亮温差异显著,并且热带地区样本对于全球总体亮温偏差影响程度达到20%,这表明COSMIC数据在热带地区的验证结果需谨慎使用.
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| 关 键 词： | COSMIC FY-3 MWTS 微波亮温 平流层低层 |
| 收稿时间： | 2016-10-16 |
Validation of FY-3 MWTS channel 4 measurements using COSMIC radio occultation data |
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| HE Wen-Ying,CHEN Hong-Bin.Validation of FY-3 MWTS channel 4 measurements using COSMIC radio occultation data[J].Chinese Journal of Geophysics,2017,60(4):1284-1292. |
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| Authors: | HE Wen-Ying CHEN Hong-Bin |
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| Institution: | LAGEO, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | In consideration of the high accuracy and stability of GPS radio occultation (RO) data in the stratosphere, COSMIC data is used to validate the Microwave Temperature Sounder (MWTS) channel 4 (ch4) measurements on serial FY-3 satellite platforms. A 2-year comparison between the simulated and observed Tb for MWTS ch4 shows that both observed MWTS ch4 Tb on FY3A/3B are overestimated, especially in the tropic and summer of polar region. The trends of Tb bias are more consistent on both FY3A/3B satellites and in the two years. The variations of Tb bias for MWTS ch4 in different latitude-zones are quite different, for instance, the Tb bias is obviously positive about 2~4 K in the tropic, and is stably positive about 1 K in the mid-latitude, while the Tb bias is evidently varied with seasons from negative in winter to positive in summer in high latitude, particularly in south pole the difference of Tb bias among seasons is about 5 K, such strong dependence on environment temperature for Tb bias is not mainly caused by the sensor central frequency shifting. In the tropic the difference of the observed and simulated Tb is more significant, and the influence of the samples in the tropic on the global Tb bias is more than 20%, which implies that it should be cautious to use the validating results derived from COSMIC in the tropical. |
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| Keywords: | COSMIC FY-3 MWTS Microwave brightness temperature Lower stratosphere |
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