Precipitable water vapour content from ESR/SKYNET sun–sky radiometers: validation against GNSS/GPS and AERONET over three different sites in Europe
Precipitable water vapour content from ESR/SKYNET sun–sky radiometers: validation against GNSS/GPS and AERONET over three different sites in Europe
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ESR/SKYNET 太阳天空辐射计的可降水水蒸气含量：在欧洲三个不同地点针对 GNSS/GPS 和 AERONET 进行验证
DOI：
10.5194/amt-11-81-2018
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发表时间：
2017
影响因子：
3.8
通讯作者：
S. Dietrich
中科院分区：
文献类型：
--
作者：
M. Campanelli;A. Mascitelli;P. Sanò;H. Diémoz;V. Estellés;S. Federico;A. Iannarelli;F. Fratarcangeli;A. Mazzoni;E. Realini;M. Crespi;O. Bock;J. Martínez;S. Dietrich
抽象的。用高水汽含量的可降水量（W）估算
时间和空间分辨率对气象和气象部门都很重要，
气候学研究。基于遥感的几种方法
最近开发了一些技术，
经常测量这个大气参数。其中，相对
低成本和容易部署的太阳天空辐射计，或太阳光度计，
在几个国际网络中运行，允许开发
从这些仪器中自动估计W，
分辨率然而，这种方法的最大问题是估计
太阳光度校准参数。本文的目的是
为了验证一种新的方法，
表征940 nm处大气透射率的参数为
取决于温度、气压和湿度的垂直分布
每个测量点的典型值。为了获得校准参数，
同时从独立来源对W进行季节性测量，
在大范围的太阳天顶角上并且覆盖宽范围的W，
是必要的。在这项工作中，每年的GNSS/GPS数据集被用于获得
表的光度校准常数和方法，应用
并在三个欧洲ESR-SKYNET网络站点中验证，其特征在于：
不同的大气和气候条件：罗马、瓦伦西亚和奥斯塔。
结果进行了验证，对GNSS/GPS和AEROSOL机器人网络（AERONET）
W估计。在这两次验证中，
高，RMSD百分比约为6%、13%和8%，
分别在罗马、奥斯塔和瓦伦西亚进行全球定位系统相互比较，
在瓦伦西亚的AERONET比较中。通过W类分析结果，发现本方法
与AERONET相比，
%偏差的条款，使与GPS的协议（考虑到
参考文献1）从5.76%偏倚至0.52%偏倚。
Abstract. The estimation of the precipitable water vapour content ( W ) with high
temporal and spatial resolution is of great interest to both meteorological
and climatological studies. Several methodologies based on remote sensing
techniques have been recently developed in order to obtain accurate and
frequent measurements of this atmospheric parameter. Among them, the relative
low cost and easy deployment of sun–sky radiometers, or sun photometers,
operating in several international networks, allowed the development of
automatic estimations of W from these instruments with high temporal
resolution. However, the great problem of this methodology is the estimation
of the sun-photometric calibration parameters. The objective of this paper is
to validate a new methodology based on the hypothesis that the calibration
parameters characterizing the atmospheric transmittance at 940 nm are
dependent on vertical profiles of temperature, air pressure and moisture
typical of each measurement site. To obtain the calibration parameters some
simultaneously seasonal measurements of W , from independent sources, taken
over a large range of solar zenith angle and covering a wide range of W ,
are needed. In this work yearly GNSS/GPS datasets were used for obtaining a
table of photometric calibration constants and the methodology was applied
and validated in three European ESR-SKYNET network sites, characterized by
different atmospheric and climatic conditions: Rome, Valencia and Aosta.
Results were validated against the GNSS/GPS and AErosol RObotic NETwork (AERONET)
W estimations. In both the validations the agreement was very
high, with a percentage RMSD of about 6, 13 and 8 % in the case of
GPS intercomparison at Rome, Aosta and Valencia, respectively, and of 8 %
in the case of AERONET comparison in Valencia. Analysing the results by W classes, the present methodology was found to
clearly improve W estimation at low W content when compared against AERONET in
terms of % bias, bringing the agreement with the GPS (considered the
reference one) from a % bias of 5.76 to 0.52.
影响因子：
4.4
作者：
Haywood, Jim M.;Bellouin, Nicolas;Shine, Keith P.
通讯作者：
Shine, Keith P.