Validating HY-2A CMR precipitable water vapor using ground-based and shipborne GNSS observations

Validating HY-2A CMR precipitable water vapor using ground-based and shipborne GNSS observations
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使用地面和船载 GNSS 观测验证 HY-2A CMR 可降水蒸气

DOI:
10.5194/amt-13-4963-2020
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发表时间:
2020-03
影响因子:
3.8
通讯作者:
Harald Schuh
Harald Schuh
中科院分区:
地球科学3区
文献类型:
--
作者:
Zhilu Wu;Yanxiong Liu;Yang Liu;Jungang Wang;Xiufeng He;Wenxue Xu;Maorong Ge;Harald Schuh

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摘要。海洋- 2a (HY-2A)卫星上的校准微波辐射计(CMR)提供湿对流层延迟校正。测高数据也有助于了解气候。系统和天气过程。地面全球导航卫星。系统(GNSS)提供精确的可降水量(PWV)。时间分辨率和可用于校准和监测。CMR数据和船载GNSS在公海上提供准确的PWV,可以直接与未受污染的CMR数据进行比较。在这项研究中,HY-2A CMR水汽产品使用地面GNSS进行验证。100个国际全球导航卫星系统服务(IGS)站沿。全球海岸线和印度洋56 d船载GNSS观测。详细讨论了GNSS数据和CMR数据的处理策略。在质量控制和改造方面做了特别的努力。被污染的CMR数据验证结果表明HY-2A CMR PWV。与地面GNSS PWV(均方根为2.67 mm)吻合较好。(均方根)在100公里内。从地理上看,极地地区的均方根为1.12毫米。其他地方是2.78毫米。HY-2A和舰载GNSS之间的PWV协议。显示出与船与船之间的距离有显著的相关性。卫星足迹,距离阈值的均方根值为1.57 mm。100公里。地基GNSS和舰载GNSS与HY-2A的CMR匹配良好。
Abstract. The calibration microwave radiometer (CMR) on board the Haiyang-2A (HY-2A) satellite provides wet tropospheric delay correction for.altimetry data, which can also contribute to the understanding of climate.system and weather processes. The ground-based global navigation satellite.system (GNSS) provides precise precipitable water vapor (PWV) with high.temporal resolution and could be used for calibration and monitoring of the.CMR data, and shipborne GNSS provides accurate PWV over open oceans, which.can be directly compared with uncontaminated CMR data. In this study, the.HY-2A CMR water vapor product is validated using ground-based GNSS.observations of 100 International GNSS Service (IGS) stations along the.global coastline and 56 d shipborne GNSS observations over the Indian.Ocean. The processing strategy for GNSS data and CMR data is discussed in.detail. Special efforts were made in the quality control and reconstruction.of contaminated CMR data. The validation result shows that HY-2A CMR PWV.agrees well with ground-based GNSS PWV with 2.67 mm as the root mean square.(rms) within 100 km. Geographically, the rms is 1.12 mm in the polar region.and 2.78 mm elsewhere. The PWV agreement between HY-2A and shipborne GNSS.shows a significant correlation with the distance between the ship and the.satellite footprint, with an rms of 1.57 mm for the distance threshold of.100 km. Ground-based GNSS and shipborne GNSS agree with HY-2A CMR well.
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