Arctic and Antarctic Oscillation signatures in tropical coral proxies over the South China Sea
Arctic Oscillation (AO) and Antarctic Oscillation (AAO) are the leading modes of atmospheric circulation in mid-high latitudes. Previous studies have revealed that the climatic influences of the two modes are dominant in extra-tropical regions. This study finds that AO and AAO signals are also w...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2009-05-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/27/1979/2009/angeo-27-1979-2009.pdf |
| Summary: | Arctic Oscillation (AO) and Antarctic Oscillation (AAO) are the
leading modes of atmospheric circulation in mid-high latitudes.
Previous studies have revealed that the climatic influences of the
two modes are dominant in extra-tropical regions. This study finds
that AO and AAO signals are also well recorded in coral proxies in
the tropical South China Sea. There are significant interannual
signals of AO and AAO in the strontium (Sr) content, which
represents the sea surface temperature (SST). Among all the seasons,
the most significant correlation occurs during winter in both
hemispheres: the strongest AO-Sr and AAO-Sr coral correlations occur
in January and August, respectively. This study also determined that
the Sr content lags behind AO and AAO by 1–3 months. Large-scale
anomalies in sea level pressure and horizontal wind at 850 hPa level
support the strength of AO/AAO-coral teleconnections. In addition, a
comparison with oxygen isotope records from two coral sites in
neighboring oceans yields significant AO and AAO signatures with
similar time lags. These results help to better understand monsoon
climates and their teleconnection to high-latitude climate changes. |
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| ISSN: | 0992-7689 1432-0576 |