92nd American Meteorological Society Annual Meeting (January 22-26, 2012)

Monday, 23 January 2012
Tropical Cyclones Interaction with High Latitude Climate Variability in the Northern Hemisphere
Hall E (New Orleans Convention Center )
Enrico Scoccimarro, Istituto Nazionale di Geofisica e Vulcanologia/Centro Euro-Mediterraneo per i Cambiamenti Climatici, Bologna, Italy; and S. Gualdi and A. Navarra

In recent years increasing interest has been put on the role that intense Tropical Cyclones (hurricanes and typhoons) can play in modulating the climate system. In this work the Tropical Cyclones (TCs) composite effect on the surface winds is investigated using the ERA-Interim reanalysis dataset and a wide cyclonic perturbation affecting a large portion of the Pacific and Atlantic tropical Oceans is highlighted. The composite effect is also evident in Sea Level Pressure (SLP) TC induced anomalies: these anomalies interest Pacific and Atlantic oceans at high latitudes, suggesting an interplay with the first two mode of variability in the Arctic basin: Arctic Oscillation (AO) and Dipole Anomaly (DA). The strength of SLP anomalies associated with AO and DA is of the same order of magnitude of the TC induced anomalies. The atmospheric structure is then investigated to better understand the link between Tropical Cyclones activity and the Arctic region.

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