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The global structure of utls ozone in geos-5: a multi-year assimilation of eos aura data
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Douglass, Anne R. Nielsen, J. Eric Wargan, Krzysztof Witte, Jacquelyn C. Ziemke, Jerald R. Olsen, Mark A. Strahan, Susan E. Pawson, Steven |
| Copyright Year | 2015 |
| Description | Eight years of ozone measurements retrieved from the Ozone Monitoring Instrument (OMI) and the Microwave Limb Sounder, both on the EOS Aura satellite, have been assimilated into the Goddard Earth Observing System version 5 (GEOS-5) data assimilation system. This study thoroughly evaluates this assimilated product, highlighting its potential for science. The impact of observations on the GEOS-5 system is explored by examining the spatial distribution of the observation-minus-forecast statistics. Independent data are used for product validation. The correlation coefficient of the lower-stratospheric ozone column with ozonesondes is 0.99 and the bias is 0.5%, indicating the success of the assimilation in reproducing the ozone variability in that layer. The upper-tropospheric assimilated ozone column is about 10% lower than the ozonesonde column but the correlation is still high (0.87). The assimilation is shown to realistically capture the sharp cross-tropopause gradient in ozone mixing ratio. Occurrence of transport-driven low ozone laminae in the assimilation system is similar to that obtained from the High Resolution Dynamics Limb Sounder (HIRDLS) above the 400 K potential temperature surface but the assimilation produces fewer laminae than seen by HIRDLS below that surface. Although the assimilation produces 5 - 8 fewer occurrences per day (up to approximately 20%) during the three years of HIRDLS data, the interannual variability is captured correctly. This data-driven assimilated product is complementary to ozone fields generated from chemistry and transport models. Applications include study of the radiative forcing by ozone and tracer transport near the tropopause. |
| File Size | 2300036 |
| Page Count | 68 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20150000790 |
| Archival Resource Key | ark:/13960/t51g5pz4z |
| Language | English |
| Publisher Date | 2015-01-01 |
| Access Restriction | Open |
| Subject Keyword | Geos-5 Ozone Monitoring Instrument Eos Aura Satellite Assimilation Earth Observing System Eos Time Series Analysis Correlation Coefficients Measuring Instruments Stratosphere Ozone Aura Spacecraft Forecasting Advanced Microwave Sounding Unit Data Products Atmospheric Composition Tropopause Total Ozone Mapping Spectrometer Ozonosphere Radiative Forcing Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
