期刊
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
卷 123, 期 11, 页码 6213-6229出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2018JD028465
关键词
UT; LS ozone; tropical ozone; ozonesondes; self-organizing maps; MERRA-2; Madden-Julian oscillations
资金
- Penn State University
- NASA/GSFC
- NASA Upper Air Research Program [NNX09AJ23G]
- UARP
- NASA Postdoctoral Program at NASA/GSFC
- NASA Upper Air Research Program (UARP) through Penn State University [NNX09AJ23G]
- NASA Upper Air Research Program (UARP) through UARP funding to NASA/GSFC
- NASA [NNX09AJ23G, 114179] Funding Source: Federal RePORTER
Our previous studies employing the self-organizing map (SOM) clustering technique to ozonesonde data have found significant links among meteorological and chemical regimes, and the shape of the ozone (O-3) profile from the troposphere to the lower stratosphere. Those studies, which focused on specific northern hemisphere midlatitude geographical regions, demonstrated the advantages of SOM clustering by quantifying O-3 profile variability and the O-3/meteorological correspondence. We expand SOM to a global set of ozonesonde profiles spanning 1980 to present from 30 sites to summarize the connections among O-3 profiles, meteorology, and chemistry, using the Modern-Era Retrospective Analysis for Research and Applications, version 2 (MERRA-2) reanalysis and other ancillary data. Four clusters of O-3 mixing ratio profiles from the surface to the upper troposphere/lower stratosphere (UT/LS) are generated for each site, which show dominant profile shapes and typical seasonality (or lack thereof) that generally correspond to latitude (i.e., tropical, subtropical, midlatitude, and polar). Examination of MERRA-2 output reveals a clear relationship among SOM clusters and covarying meteorological fields (geopotential height, potential vorticity, and tropopause height) for polar and midlatitude sites. However, these relationships break down within +/- 30 degrees latitude. Carbon monoxide satellite data, along with velocity potential, a proxy for convection, calculated from MERRA-2 wind fields assist characterization of the tropical and subtropical sites, where biomass burning and convective transport linked to the Madden-Julian oscillation (MJO) dominate O-3 variability. In addition to geophysical characterization of O-3 profile variability, these results can be used to evaluate chemical transport model output and satellite measurements of O-3 profiles.
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