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Impact of tropical cyclone winds on ENSO

Presentation Date
Thursday, December 15, 2022 at 11:32am - Thursday, December 15, 2022 at 11:42am
Location
McCormick Place - E351
Authors

Author

Abstract

The impact of tropical cyclone (TC) winds on ENSO is investigated using the fully-coupled Community Earth System model (CESM 1.3). We conduct a suite of experiments where we insert TC winds, extracted from a TC-permitting simulation (0.25˚ atmosphere), into the low-resolution model configuration (1˚ atmosphere) with nearly no intrinsic TCs. Results are compared to a control experiment to diagnose TCs’ impact on ENSO. The added TC winds increased the ENSO power and shifted the ENSO frequency closer to the observations. TCs lead to an increase of strong to extreme El Nino events, and a positive correlation is identified between strong El Nino events and TC wind power. TCs’ impact on El Nino is mainly through enhanced zonal advection feedback and thermocline feedback. Our results suggest that TCs can actively influence ENSO characteristics in a fully coupled comprehensive Earth System model, pointing to an important two-way interaction between TCs and ENSO.

Funding Program Area(s)