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Pang-chi Hsu and Tim Li

Interactions between Summer Intraseasonal Oscillations and Synoptic-scale Disturbances over the Western North Pacific. Pang-chi Hsu and Tim Li. LFBS to Eddy. ISO to Eddy. Eddy to ISO.

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Pang-chi Hsu and Tim Li

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  1. Interactions between Summer Intraseasonal Oscillations and Synoptic-scale Disturbances over the Western North Pacific Pang-chi Hsu and Tim Li LFBS to Eddy ISO to Eddy Eddy to ISO (Left) 850-hPa barotropic energy conversion between LFBS and eddy averaged over July-September. 850-hPa barotropic energy conversion between ISO and eddy during the ISO (Middle) active and (Right) suppressed phase. Units: 10-5m2/s3. The role of scale interactions in the eddy kinetic energy (EKE) budget during the wet and dry phases of the intraseasonal oscillation (ISO) was examined with a newly constructed eddy energetics diagnostic tool that separates the EKE of the ISO from that of the low-frequency background state (LFBS, with periods longer than 90 days). In boreal summer, synoptic eddies take on kinetic energy from LFBS regardless of the ISO phase. During the moist ISO phase, the eddies extract energy from the ISO. This positive barotropic energy conversion results from eddy-interaction with the low-level cyclonic and convergent/confluent ISO flows. During the dry ISO phase, the synoptic eddies lose kinetic energy to the ISO flow. This negative barotropic energy conversion results from eddy-interaction with the anticyclonic and divergent/diffluent ISO flows.

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