The relationship between lower-stratospheric ozone at southern high latitudes and sea surface temperature in the East Asian marginal seas in austral spring
Using satellite observations, reanalysis data, and model simulations, this study investigates the effect of sea surface temperature (SST) on interannual variations of lower-stratospheric ozone at southern high latitudes in austral spring. It is found that the SST variations across the East Asian...
Main Authors: | , , , , , , , , , , |
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Format: | Article |
Language: | English |
Published: |
Copernicus Publications
2017-06-01
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Series: | Atmospheric Chemistry and Physics |
Online Access: | http://www.atmos-chem-phys.net/17/6705/2017/acp-17-6705-2017.pdf |
Summary: | Using satellite observations, reanalysis data, and model simulations, this
study investigates the effect of sea surface temperature (SST) on interannual
variations of lower-stratospheric ozone at southern high latitudes in austral
spring. It is found that the SST variations across the East Asian marginal
seas (5° S–35° N, 100–140° E) rather than the
tropical eastern Pacific Ocean, where ENSO occurs, have the most significant
correlation with the southern high-latitude lower-stratospheric ozone changes
in austral spring. Further analysis reveals that planetary waves originating
over the marginal seas in austral spring can propagate towards southern
middle to high latitudes via teleconnection pathway. The anomalous
propagation and dissipation of ultra-long Rossby waves in the stratosphere
strengthen/cool (weaken/warm) the southern polar vortex, which produces more
(less) active chlorine and enhances (suppresses) ozone depletion in the
southern high-latitude stratosphere on one the hand and impedes (favors) the
transport of ozone from the southern middle-latitude stratosphere to high
latitudes on the other. The model simulations also reveal that approximately
17 % of the decreasing trend in the southern high-latitude
lower-stratospheric ozone observed over the past 5 decades may be associated
with the increasing trend in SST over the East Asian marginal seas. |
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ISSN: | 1680-7316 1680-7324 |