Presenter: Clara Orbe

Title: Modes of Variability in U.S. Climate Models

Abstract: We compare the performance of several modes of variability across six US climate modeling groups, with a focus on identifying robust improvements in recent models (including those participating in the Coupled Model Intercomparison Project (CMIP) Phase 6) compared to previous versions. In particular, we examine the representation of the Madden-Julian Oscillation (MJO), the El Nino/Southern Oscillation (ENSO), the Pacific Decadal Oscillation (PDO), the Quasi-Biennial Oscillation (QBO) in the tropical stratosphere and the dominant modes of extra-tropical variability, including the Southern Annular Mode (SAM), the Northern Annular Mode (NAM) (and the closely related North Atlantic Oscillation (NAO)), and the Pacific-North American Pattern (PNA). Where feasible, we explore the processes driving these improvements through the use of ``intermediary" experiments that utilize model versions between CMIP3/5 and CMIP6 as well as targeted sensitivity experiments in which individual modeling parameters are altered. We find clear and systematic improvements in the MJO and QBO and in the teleconnection patterns associated with the PDO and ENSO. Some gains arise from better process representation, while others (e.g. the QBO) from higher resolution that allows for a greater range of interactions. Our results demonstrate that the incremental development processes in multiple climate model groups lead to more realistic simulations over time.

Date

30 Apr 2020

Time

PT: 8:30 am
ET: 11:30 am

Call Info

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Attendees

Presentation

Time	Title	Presenter	Presentation	Recording	Notes
30 min	Modes of Variability in US Climate modes	Clara Orbe	E3SMseminar_Orbe.pdf	MP4 Movie (on the E3SM YouTube Channel)

Time

Title

Presenter

Presentation

Recording

Notes

30 min

Modes of Variability in US Climate modes

Clara Orbe

E3SMseminar_Orbe.pdf

MP4 Movie (on the E3SM YouTube Channel)

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