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Three-way Calibration Checks Using Ground-Based, Ship-Based and Spaceborne Radars
Atmospheric Measurement Techniques ( IF 3.2 ) Pub Date : 2021-09-14 , DOI: 10.5194/amt-2021-257
Alain Protat , Valentin Louf , Joshua Soderholm , Jordan Brook , William Ponsonby

Abstract. This study uses weather radar observations collected from Research Vessel Investigator to evaluate the Australian weather radar network calibration monitoring technique that uses spaceborne radar observations from the NASA Global Precipitation Mission (GPM). Quantitative operational applications such as rainfall and hail nowcasting require a calibration accuracy of 1 dB for radars of the Australian network covering capital cities. Seven ground-based radars along the coast and the ship-based OceanPOL radar are first calibrated independently using GPM radar overpasses over a 3-month period. The calibration difference between the OceanPOL radar and each of the 7 operational radars is then estimated using collocated, gridded, radar observations to evaluate the accuracy of the GPM technique. For all seven radars the calibration difference with the ship radar lies within ±0.5 dB, therefore fulfilling the 1 dB requirement. This result validates the concept of using the GPM spaceborne radar observations to calibrate national weather radar networks (provided that the spaceborne radar maintains a high calibration accuracy). The analysis of the day-to-day and hourly variability of calibration differences between the OceanPOL and Darwin (Berrimah) radars also demonstrates that quantitative comparisons of gridded radar observations can accurately track daily and hourly calibration differences between pairs of operational radars with overlapping coverage (daily and hourly standard deviations of ~ 0.3 dB and ~ 1 dB, respectively).

中文翻译:

使用陆基、舰载和星载雷达进行三向校准检查

摘要。本研究使用从研究船调查员收集的天气雷达观测来评估澳大利亚天气雷达网络校准监测技术,该技术使用来自美国宇航局全球降水任务 (GPM) 的星载雷达观测。降雨和冰雹临近预报等定量业务应用要求覆盖首府城市的澳大利亚网络雷达的校准精度为 1 dB。沿海的 7 个陆基雷达和舰载 OceanPOL 雷达首先使用 GPM 雷达立交桥在 3 个月的时间里独立校准。然后使用并置、网格化的雷达观测来估计 OceanPOL 雷达与 7 个运行雷达中的每一个之间的校准差异,以评估 GPM 技术的准确性。对于所有七部雷达,与船用雷达的校准差异均在 ±0.5 dB 以内,因此满足 1 dB 要求。这一结果验证了使用 GPM 星载雷达观测校准国家气象雷达网络的概念(前提是星载雷达保持高校准精度)。对 OceanPOL 和达尔文 (Berrimah) 雷达之间校准差异的每日和每小时变化的分析还表明,网格雷达观测的定量比较可以准确地跟踪具有重叠覆盖范围的操作雷达对之间的每日和每小时校准差异(每日和每小时的标准偏差分别为 ~ 0.3 dB 和 ~ 1 dB)。这一结果验证了使用 GPM 星载雷达观测校准国家气象雷达网络的概念(前提是星载雷达保持高校准精度)。对 OceanPOL 和达尔文 (Berrimah) 雷达之间校准差异的每日和每小时变化的分析还表明,网格雷达观测的定量比较可以准确地跟踪具有重叠覆盖范围的操作雷达对之间的每日和每小时校准差异(每日和每小时的标准偏差分别为 ~ 0.3 dB 和 ~ 1 dB)。这一结果验证了使用 GPM 星载雷达观测校准国家气象雷达网络的概念(前提是星载雷达保持高校准精度)。对 OceanPOL 和达尔文 (Berrimah) 雷达之间校准差异的日常和每小时​​变化的分析还表明,网格雷达观测的定量比较可以准确地跟踪具有重叠覆盖范围的操作雷达对之间的每日和每小时校准差异(每日和每小时的标准偏差分别为 ~ 0.3 dB 和 ~ 1 dB)。
更新日期:2021-09-14
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