Applicability of methods for estimating GPS precipitable water in the Qinghai-Tibet Plateau

Applicability of methods for estimating GPS precipitable water in the Qinghai-Tibet Plateau
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GPS可降水量估算方法在青藏高原的适用性

DOI:
10.1016/j.jastp.2012.08.008
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发表时间:
2012-11
影响因子:
1.9
通讯作者:
Guangliu Feng
Guangliu Feng
中科院分区:
地球科学4区
文献类型:
--
作者:
Anwei Lai;Xia Wan;Zhikang Fu;Guangliu Feng

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大气加权平均温度(TM)和天顶静水延迟(ZHD)是决定GPS可降水量(PW)估算精度的关键参数。利用10-30m的高垂直分辨率探空剖面,计算了TM、ZHD和PW,并研究了Tmand ZHD模型的适用性,以及由此得到的GPS PW在青藏高原(QTP)的适用性。结果表明:(1)Bevis TM模式在QTP中的偏差和均方根误差分别小于5%和2%,日变化在上午较小,其他时间较大。(2)ZHD模型在QTP中的均方根误差在1%以内,小于中国中部平原的RMS误差在1.5%以内。在QTP中,Saastamoinen模型的ZHD偏差小于0.5%,小于Hopfield和Black模型的ZHD偏差。模拟的ZHD偏差和均方根误差在QTP中的日变化是复杂的,随ZHD模型和站点的变化而变化。(3)GPS PW的相对均方根误差随台站高度的升高而增大,QTP的相对均方根误差在12-66%之间,中国中部平原的相对RMS误差在8%以内。QTP中GPS PW偏差和均方根误差的日变化与模拟的ZHD相似。(4)GPS PW的精度主要受ZHD模型的影响,一个好的TM可以提高QTP中GPS PW的精度。
Atmospheric weighted mean temperature (Tm) and zenith hydrostatic delay (ZHD) are key parameters in determining the accuracy of GPS precipitable water (PW) estimations. Using radiosonde profiles with a high vertical resolution of 10–30m, we calculated Tm, ZHD and PW and investigated the applicability of the modeled Tmand ZHD, including the GPS PW obtained with them, in the Qinghai-Tibet Plateau (QTP). It is found that (1) the bias and RMS error of the Bevis Tmmodel in the QTP are less than 5% and 2%, respectively, with a diurnal variation that is small in the morning and large otherwise. (2) The ZHD models have an RMS error within 1% in the QTP, which is smaller than that in the plain of Central China, which is within 1.5%. The ZHD bias of the Saastamoinen model is less than 0.5% in the QTP, smaller than those of the Hopfield and Black models. The diurnal variations of the modeled ZHD bias and RMS error are complex in the QTP, varying with the ZHD model and station. (3) The relative RMS error of GPS PW increases with the station altitude, with a range of 12–66% in the QTP and within 8% in the plain of Central China. The diurnal variations of the GPS PW bias and RMS error in the QTP are similar to those of the modeled ZHD. (4) The accuracy of GPS PW is mainly affected by the ZHD model, and a good Tmcan improve the accuracy of GPS PW in the QTP.
DOI: --
发表时间: 2009
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