用CHAMP上GPS无线电掩星对对流水蒸气的全球监测
Global monitoring of tropospheric water vapor with GPS radio occultation aboard CHAMP
摘要：
本文讨论了CHAMP上GPS无线电掩星（RO）测量在对流层水蒸气廓线反演中的应用。全球定位系统反渗透技术为大气探测提供了一个强有力的工具，它不需要校准，不受云、气溶胶或降水的影响，并提供几乎均匀的全球覆盖。简要介绍了GPS反渗透观测资料的处理和反演垂直水汽活动、温度和水蒸气廓线的方法。自2001年以来，CHAMP RO数据每天提供多达200个高分辨率大气剖面。用无线电探空仪数据对CHAMP水蒸气廓线进行的全球验证表明，在对流层低层，偏差约为0.2 g/kg，标准差小于1 g/kg比湿度。我们展示了CHAMP RO反演监测全球尺度对流层平均水蒸气分布的潜力。
英文摘要：
The paper deals with application of GPS radio occultation (RO) measurements aboard CHAMP for the retrieval of tropospheric water vapor profiles. The GPS RO technique provides a powerful tool for atmospheric sounding which requires no calibration, is not affected by clouds, aerosols or precipitation, and provides an almost uniform global coverage. We briefly overview data processing and retrieval of vertical refractivity, temperature and water vapor profiles from GPS RO observations. CHAMP RO data are available since 2001 with up to 200 high resolution atmospheric profiles per day. Global validation of CHAMP water vapor profiles with radiosonde data reveals a bias of about 0.2 g/kg and a standard deviation of less than 1 g/kg specific humidity in the lower troposphere. We demonstrate potentials of CHAMP RO retrievals for monitoring the mean tropospheric water vapor distribution on a global scale.
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