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- Title
Vertical level selection for temperature and trace gas profile retrievals using IASI.
- Authors
Vincent, R. A.; Dudhia, A.; Ventress, L. J.
- Abstract
This work presents a new iterative method for optimally selecting a vertical retrieval grid based on the location of the information content while accounting for inter-level correlations. Sample atmospheres initially created to parametrise the RTTOV forward model are used to compare the presented iterative vertical selection method with two other common approaches, which are using levels of equal vertical spacing and selecting levels based on the cumulative trace of the averaging kernel matrix (AKM). This new method is shown to outperform compared methods for synthesized profile retrievals with IASI of temperature, H2O, O3, CH4, and CO. However, the benefits of using the more complicated iterative approach compared to the simpler method of referencing the cumulative trace of the AKM are slight and may not justify the added effort. Furthermore, comparing retrievals using a globally optimized static grid vs. an atmosphere specific one shows that a static grid is likely appropriate for retrievals of O3, CH4, and CO. However, developers of temperature and H2O retrieval schemes may at least consider using adaptive or location specific vertical retrieval grids.
- Subjects
ATMOSPHERE; TEMPERATURE control; KERNEL functions; GASES; ISOTHERMAL processes
- Publication
Atmospheric Measurement Techniques Discussions, 2015, Vol 8, Issue 3, p2591
- ISSN
1867-8610
- Publication type
Article
- DOI
10.5194/amtd-8-2591-2015