Connection between Antarctic Ozone and Climate: Interannual Precipitation Changes in the Southern Hemisphere
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2020Metadata
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Damiani, Alessandro
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Connection between Antarctic Ozone and Climate: Interannual Precipitation Changes in the Southern Hemisphere
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Abstract
In this study, we explored the connection between anomalies in springtime Antarctic ozone
and all-year precipitation in the Southern Hemisphere by using observations from 1960–2018 and
coupled simulations for 1960–2050. The observations showed that this correlation was enhanced
during the last several decades, when a simultaneously increased coupling between ozone and
Southern Annular Mode (SAM) anomalies became broader, covering most of the following summer
and part of the previous winter. For eastern Australia, the ozone–precipitation connection shows a
greater persistence toward the following summer than for other regions. On the other hand, for South
America, the ozone–precipitation correlation seems more robust, especially in the early summer.
There, the correlation also covers part of the previous winter, suggesting that winter planetary waves
could a ect both parameters. Further, we estimated the sensitivity of precipitation to changes in
Antarctic ozone. In both observations and simulations, we found comparable sensitivity values during
the spring–summer period. Overall, our results indicate that ozone anomalies can be understood as a
tracer of stratospheric circulation. However, simulations indicate that stratospheric ozone chemistry
still contributes to strengthening the interannual relationship between ozone and surface climate.
Because simulations reproduced most of the observed connections, we suggest that including ozone
variability in seasonal forecasting systems can potentially improve predictions.
Patrocinador
Environment Research and Technology Development Fund of the Environmental Restoration and Conservation Agency of Japan
2-1901
Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT)
Japan Society for the Promotion of Science
Grants-in-Aid for Scientific Research (KAKENHI)
JP19H04235
Japan Science & Technology Agency (JST)
Core Research for Evolutional Science and Technology (CREST)
JPMJCR15K4
SOUSEI program, MEXT, Japan
Chilean Antarctic Institute (INACH, Preis)
RT_32-15
Consejo Nacional de Ciencia y Tecnologia (FONDECYT)
1191932
1171690
1161460
3150229
CORFO
18BPE-93920
17BPCR-89100
17BPE-73748
Universidad de Santiago de Chile (USACH)
Preis USA1555
JAXA 2nd research announcement on the Earth Observations
19RT000351
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Atmosphere 2020, 11, 579
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