Relationship between sea surface temperature anomalies in the Southwestern Atlantic Continental Shelf and atmospheric variability on intraseasonal timescales
| العنوان: | Relationship between sea surface temperature anomalies in the Southwestern Atlantic Continental Shelf and atmospheric variability on intraseasonal timescales |
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| المؤلفون: | Claudia G. Simionato, Mariano Sebastián Alvarez, Moira Luz Clara, Andrés Javier Jaureguizar, Carolina Vera |
| المصدر: | Climate Dynamics. 59:1539-1554 |
| بيانات النشر: | Springer Science and Business Media LLC, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Atmosphere, Atmospheric Science, Sea surface temperature, geography, geography.geographical_feature_category, Atmospheric pressure, Continental shelf, Atmospheric wave, Climatology, Rossby wave, Environmental science, Predictability, Teleconnection |
| الوصف: | The intraseasonal (IS) variability of the sea surface temperature (SST) in the Southwestern Atlantic Continental Shelf (SWACS, 45–33° S—70–50° W), and its relationship with that in the atmosphere, was studied for the austral warm season. SST satellite data (11-km resolution NOAA CoastWatch Program) and data of different atmospheric variables (Reanalysis1 NCEP/NCAR and ERA-Interim) were used. Data were filtered using a 10–90 day filter to isolate the IS variability. A Principal Component analysis was applied then to the filtered SST anomalies (SSTA) and the activity of the leading modes was described through the corresponding temporal series. The first three modes are significant. EOF1 (25.7% of variance) exhibits SSTA of opposite sign to the north/south of 42° S. EOF2 (9.0%) and EOF3 (5.1%) are related with centers of SSTA of opposite sign located off the Uruguayan coast and in the middle shelf. Composites of SSTA and of key atmospheric variables were made considering the days in which the main modes were active. They show that the SSTA described by the three modes are associated with distinctive regional sea level pressure anomalies that, in turn, seem to be related to atmospheric Rossby wave trains extending from the Australia area towards South America. The corresponding atmospheric wave sources vary depending on the mode. These results show, therefore, that the SSTA in the SWACS exhibit significant IS variability that is, in part, locally and remotely influenced by atmospheric anomalies oscillating on similar timescales. These ocean–atmosphere teleconnections could help to improve ocean predictability at those timescales in the future. |
| تدمد: | 1432-0894 0930-7575 |
| DOI: | 10.1007/s00382-021-06058-3 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::056f04f824e5e965aa397eb69a85cb4d https://doi.org/10.1007/s00382-021-06058-3 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi...........056f04f824e5e965aa397eb69a85cb4d |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14320894 09307575 |
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| DOI: | 10.1007/s00382-021-06058-3 |