BDS锚碇浮标监测海洋大气水汽初步探究

Preliminary study of atmospheric water vapor monitoring using BeiDou moored buoy over ocean

精细化、动态化监测海洋大气水汽含量对全球海洋气候相关研究具有重要意义。为探究基于北斗卫星导航系统(BDS)的锚碇浮标平台在海洋水汽探测应用中的潜力,本研究利用白龙浮标搭载的测量型接收机,分别在岸基静态模式和海面动态模式下,对获取的BDS和全球定位系统(GPS)观测数据进行精密单点定位处理,并进行大气可降水量(PWV)反演,同时以欧洲中期天气预报中心第五代全球气候再分析数据集(ERA5)获取的PWV为参考值进行精度评估。结果表明:岸基静态模式下利用BDS观测值反演的PWV精度为0.7 mm,GPS反演的PWV精度为0.6 mm。海面动态模式下利用BDS观测值反演的PWV精度为1.2 mm,GPS反演的PWV精度为2.0 mm,与岸基静态模式探测的水汽产品精度基本相符。初步证明了利用BDS锚碇浮标在海洋动态观测条件下进行水汽含量监测的可行性,但仍需更长期更充分的观测以进一步验证。

Accurately and dynamically monitoring the water vapor over the ocean is of vital importance for global climate research.To explore the potential of BeiDou-based moored buoy platform in detection of atmospheric water vapor above the ocean,the experiment was carried out with the BeiDou navigation satellite system(BDS)and global positioning system(GPS)observations from the receiver on the Bailong buoy.The precise point positioning(PPP)technique was applied to process global navigation satellite system(GNSS)observation and retrieve the precipitable water vapor(PWV)under shore-based static and seasurface dynamic modes,respectively.The PWV retrieved from BDS observation was evaluated by the international authoritative global reanalysis data ERA5.It was showed that under shore-based static mode,the root-mean-square(RMS)results of the PWV differences were 0.7 mm and 0.6 mm for BDS and GPS,respectively.While for the sea-surface dynamic mode,the RMS results were 1.2 and 2.0 mm for BDS and GPS,respectively.It indicated that the PWV under the dynamic mode shared similar accuracy with that under the static mode.This partly proved the feasibility of using BDS moored buoy for monitoring atmospheric water vapor under the sea-surface dynamic mode.However,further study should be carried out with longer experiment and more sufficient observation.