Optimal estimation of tropospheric H 2 O and δD with IASI/METOP
Optimal estimation of tropospheric H 2 O and δD with IASI/METOP
复制标题
利用 IASI/METOP 对对流层 H 2 O 和 δD 进行优化估算
DOI：
10.5194/acp-11-11207-2011
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发表时间：
2011
影响因子：
6.3
通讯作者：
F. Hase
中科院分区：
文献类型：
--
作者：
M. Schneider;F. Hase
我们提出了对流层 H2O 和 D 的最佳估计，该估计是根据 EUMETSAT 极轨飞行器 METOP 上飞行的 IASI（红外大气探测干涉仪）仪器测量的辐射率得出的。我们记录了 IASI 光谱允许检索地表和对流层上层之间的 H2O 剖面以及对流层中层 D 值。理论误差估计表明，H2O 在对流层下部的精度优于 35%，在对流层中部和上部的精度分别优于 15%，其中表面发射率和大气温度的不确定性是主要误差源。对于中对流层 D 值，我们估计精度为 15-20 ‰，测量噪声是主要误差源。对于对流层下层到上层 H2O 和对流层中层 D，IASI 产品的精度估计分别约为 20-10% 和 10 ‰。它受到所应用的光谱参数和先验大气温度剖面的系统不确定性的限制。我们将我们的 IASI 产品与大量近重合无线电探空仪现场和地面 FTS（傅立叶变换谱仪）遥感测量进行比较。不同 H2O 和 D 数据集之间的偏差和分散度与所涉及测量技术的综合理论不确定性一致。
We present optimal estimates of tropospheric H2O and D derived from radiances measured by the instrument IASI (Infrared Atmospheric Sounding Interferometer) flown on EUMETSAT's polar orbiter METOP. We document that the IASI spectra allow for retrieving H2O profiles between the surface and the upper troposphere as well as middle tro- pospheric D values. A theoretical error estimation suggests a precision for H2O of better than 35 % in the lower tro- posphere and of better than 15 % in the middle and upper troposphere, respectively, whereby surface emissivity and atmospheric temperature uncertainties are the leading error sources. For the middle tropospheric D values we estimate a precision of 15-20 ‰ with the measurement noise being the dominating error source. The accuracy of the IASI products is estimated to about 20-10 % and 10 ‰ for lower to upper tropospheric H2O and middle tropospheric D, respectively. It is limited by systematic uncertainties in the applied spec- troscopic parameters and the a priori atmospheric tempera- ture profiles. We compare our IASI products to a large num- ber of near coincident radiosonde in-situ and ground-based FTS (Fourier Transform Spectrometer) remote sensing mea- surements. The bias and the scatter between the different H2O and D data sets are consistent with the combined theo- retical uncertainties of the involved measurement techniques.