Statistics – Computation
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa51b1943e&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA51B-1943
Statistics
Computation
[0520] Computational Geophysics / Data Analysis: Algorithms And Implementation, [3332] Atmospheric Processes / Mesospheric Dynamics, [3360] Atmospheric Processes / Remote Sensing
Scientific paper
The main purpose of this study is to evaluate the Superconducting sub-Millimeter Limb Emission Sounder (SMILES) measurements of mesospheric ozone, O3. As the first step, the error due to the impact of Mesospheric Temperature Inversions (MTIs) on ozone retrieval has been determined. The impacts of other parameters such as pressure variability, solar events, and etc. on mesospheric O3 will also be investigated. Ozone, is known to be important due to the stratospheric O3 layer protection of life on Earth by absorbing harmful UV radiations. However, O3 chemistry can be studied purely in the mesosphere without distraction of heterogeneous situation and dynamical variations due to the short lifetime of O3 in this region. Mesospheric ozone is produced by the photo-dissociation of O2 and the subsequent reaction of O with O2. Diurnal and semi-diurnal variations of mesospheric ozone are associated with variations in solar activity. The amplitude of the diurnal variation increases from a few percent at an altitude of 50 km, to about 80 percent at 70 km. Although despite the apparent simplicity of this situation, significant disagreements exist between the predictions from the existing models and observations, which need to be resolved. SMILES is a highly sensitive radiometer with a few to several tens percent of precision from upper troposphere to the mesosphere. SMILES was developed by the Japanese Aerospace eXploration Agency (JAXA) and the National Institute of Information and Communications Technology (NICT) located at the Japanese Experiment Module (JEM) on the International Space Station (ISS). SMILES has successfully measured the vertical distributions and the diurnal variations of various atmospheric species in the latitude range of 38S to 65N from October 2009 to April 2010. A sensitivity analysis is being conducted to investigate the expected precision and accuracy of the mesospheric O3 profiles (from 50 to 90 km height) due to the impact of Mesospheric Temperature Inversions (MTIs). This study uses the retrieval and forward models developed at NICT for the level-2 research products. Sensitivity analysis has been implemented on the retrieved O3 profiles using the synthetic measurements and considering various error sources such as parameter approximations of the retrieval and forward model approximations of the retrieval and forward model noises, instrumental, and navigation errors. The results of this study represent that the systematic and random errors caused by the temperature inversions in the mesosphere zone, are about 3 and 4 percent, respectively. Comparison between the computed errors with the ones estimated without taking MTIs into account depicts that: 1) random error is small compared to the noise measurement, but 2) the systematic error has the same order of magnitude as calibration and spectroscopic errors. Evaluation and error analysis of SMILES will lead us to a solution for adjusting some of the uncertainties and improving assimilated data and associated products.
Baron Philippe
Esmaeili Mahani M.
Kasaba Yasumasa
Kasai Yasuko
Murata Ichiro
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