Tomographic retrieval of atmospheric parameters from infrared limb emission observations.
Tomographic retrieval of atmospheric parameters from infrared limb emission observations.
复制标题
从红外临边发射观测中大气参数的层析成像检索。
作者：
T. Steck;M. Höpfner;T. von Clarmann;U. Grabowski
临边探测测量的典型反演假定大气的局部水平均匀性。这种简化对应的光谱辐射误差，可以超过一个典型的红外仪器的噪声水平的10倍，并导致检索的状态参数的错误。为了避免这些错误，并考虑到大气的水平结构，一个二维（2D）层析序列估计方法。从模拟测量温度检索的应用程序产生典型的检索误差的顺序为1 K，和一维检索与相同的合成测量显示差异的真实值高达10 K的区域具有较强的水平不均匀性。2D检索的水平分辨率甚至比水平切线点间距更好（高达40公里）。
Typical inversion of limb-sounding measurements assumes local horizontal homogeneity of the atmosphere. This simplification corresponds to spectral radiance errors that can exceed the noise level of a typical infrared instrument by a factor of 10 and causes errors in retrieved state parameters. To avoid these errors and to take the horizontal structure of the atmosphere into account, a two-dimensional (2D) tomographic sequential estimation approach is described. Application to temperature retrievals from simulated measurements yields typical retrieval errors of the order of 1 K, and a one-dimensional retrieval with the same synthetic measurements shows differences to the true values up to 10 K in regions with strong horizontal inhomogeneities. The horizontal resolution of the 2D retrieval is even better (up to 40 km) than the horizontal tangent point spacing.