ENSO Influence on Atlantic hurricanes via tropospheric warming

Details ENSO Influence on Atlantic hurricanes via tropospheric warming ENSO Influence on Atlantic hurricanes via tropospheric warming

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3124204t&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 24, CiteID L24204

Physics

24

Meteorology And Atmospheric Dynamics: Climatology (1620), Meteorology And Atmospheric Dynamics: Convective Processes, Meteorology And Atmospheric Dynamics: Ocean/Atmosphere Interactions (0312, 4504), Meteorology And Atmospheric Dynamics: Tropical Meteorology

Scientific paper

A new pathway for the negative impact of ENSO on tropical North Atlantic (NAtl) storm activity is examined empirically. Anomalous tropospheric temperatures communicated from the Pacific by wave dynamics are hypothesized to impact storm development by affecting column stability relative to equilibrium with NAtl sea surface temperature (SST). This combines recent teleconnection theory with the role of tropospheric temperature-SST differences in hurricane intensity theory. An equilibrium principle component (EQ PC) in which NAtl SST and tropospheric temperature covary, explains most of their variance. A disequilibrium PC (DEQ PC), measuring column stability relative to SST, correlates highly with hurricane season indices for storm frequency and intensity. The hurricane season (Jun.-Nov.) DEQ PC is closely related to ENSO SST just prior to and within the season, consistent with NAtl SST not having had time to adjust to the teleconnected tropospheric warming from onsetting ENSO events. The EQPC is related to prior winter ENSO SST.

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