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Temperature anomalies in the lower stratosphere (namely, at 50-hPa) poleward of 30°N (hereafter, T50) are analysed from reanalysis daily products (i.e. ERA-40 and NCEP/NCAR) in order to detect those regions with statistically significant trends of T50 during the common 1957?2002 period. We also analyse radiosonde data in order to validate the reanalyses results. The analyses are conducted for the extended polar winter (i.e. from November to May) in order to relate T50 changes to the northern polar vortex variability. In relation to the previous literature, the novelty of this study is double: first, temporal evolution is considered according to regions with similar T50 temporal variability in the Northern Hemisphere;...
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Temperature anomalies in the lower stratosphere (namely, at 50-hPa) poleward of 30°N (hereafter, T50) are analysed from reanalysis daily products (i.e. ERA-40 and NCEP/NCAR) in order to detect those regions with statistically significant trends of T50 during the common 1957?2002 period. We also analyse radiosonde data in order to validate the reanalyses results. The analyses are conducted for the extended polar winter (i.e. from November to May) in order to relate T50 changes to the northern polar vortex variability. In relation to the previous literature, the novelty of this study is double: first, temporal evolution is considered according to regions with similar T50 temporal variability in the Northern Hemisphere;...
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Temperature anomalies in the lower stratosphere (namely, at 50-hPa) poleward of 30°N (hereafter, T50) are analysed from reanalysis daily products (i.e. ERA-40 and NCEP/NCAR) in order to detect those regions with statistically significant trends of T50 during the common 1957?2002 period. We also analyse radiosonde data in order to validate the reanalyses results. The analyses are conducted for the extended polar winter (i.e. from November to May) in order to relate T50 changes to the northern polar vortex variability. In relation to the previous literature, the novelty of this study is double: first, temporal evolution is considered according to regions with similar T50 temporal variability in the Northern Hemisphere;...
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Temperature anomalies in the lower stratosphere (namely, at 50-hPa) poleward of 30°N (hereafter, T50) are analysed from reanalysis daily products (i.e. ERA-40 and NCEP/NCAR) in order to detect those regions with statistically significant trends of T50 during the common 1957?2002 period. We also analyse radiosonde data in order to validate the reanalyses results. The analyses are conducted for the extended polar winter (i.e. from November to May) in order to relate T50 changes to the northern polar vortex variability. In relation to the previous literature, the novelty of this study is double: first, temporal evolution is considered according to regions with similar T50 temporal variability in the Northern Hemisphere;...
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Temperature anomalies in the lower stratosphere (namely, at 50-hPa) poleward of 30°N (hereafter, T50) are analysed from reanalysis daily products (i.e. ERA-40 and NCEP/NCAR) in order to detect those regions with statistically significant trends of T50 during the common 1957?2002 period. We also analyse radiosonde data in order to validate the reanalyses results. The analyses are conducted for the extended polar winter (i.e. from November to May) in order to relate T50 changes to the northern polar vortex variability. In relation to the previous literature, the novelty of this study is double: first, temporal evolution is considered according to regions with similar T50 temporal variability in the Northern Hemisphere;...
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