Assessment of SAGE III-ISS solar ozone data and sampling biases in merged ozone datasets
Abstract
The Stratospheric Aerosol and Gas Experiment III on the International Space Station (SAGE III-ISS) was launched in February 2017. It is the 2nd instrument from the SAGE III project, and an extension of previous satellite instruments (SAM I, SAM II, SAGE I, SAGE II, SAGE III/Meteor-3M) that go back to 1975. The SAGE (and other solar occultation) instruments have advantages such as high vertical resolution, strong signal to noise ratio, and self-calibrating features that make them suitable for monitoring ozone long-term trends. They are included in several merged ozone datasets, such as GOZCARDS (Froidevaux et al., 2015), SWOOSH (Davis et al., 2016), SAGE-CCI-OMPS (Sofieva et al, 2017), and used for ozone trend assessments (Steinbrecht et al., 2017, WMO, 2018). The geographic coverage of solar occultation measurements, however, is more limited than that of thermal emission or limb scattering instruments. This could result in sampling biases in merged datasets (Toohey et al., 2013), and affect estimated ozone trends (Damadeo et al., 2018).
We will present validation results of SAGE III-ISS V5.1 solar ozone data by using correlative measurements from ground based (ozonesondes, lidar) and satellite (Aura MLS, Odin-OSIRIS, ACE-FTS, OMPS-LP) instruments. The NASA GMI simulations integrated with MERRA2 meteorology (Douglass et al., 2017, Strahan et al., 2016) will be used to investigate the sampling biases in merged ozone datasets, and most importantly whether the two dimensional regression technique (e.g. Bodeker et al., 2013, Damadeo et al., 2014) can be used to minimize the sampling bias in merged datasets with non-uniform observations.- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.A51R2650W
- Keywords:
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- 0340 Middle atmosphere: composition and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 0365 Troposphere: composition and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 3305 Climate change and variability;
- ATMOSPHERIC PROCESSES;
- 3362 Stratosphere/troposphere interactions;
- ATMOSPHERIC PROCESSES