1 / 15

Characterizing warm-ENSO variability in the Equatorial Pacific

Characterizing warm-ENSO variability in the Equatorial Pacific. An OLR Perspective A.M. Chiodi D.E. Harrison (submitted to J. Climate ). Warm-event US impacts. Smith et al. (1999) J. Climate. Rationale for an OLR-ENSO Index.

sai
Download Presentation

Characterizing warm-ENSO variability in the Equatorial Pacific

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Characterizing warm-ENSO variability in the Equatorial Pacific An OLR Perspective A.M. Chiodi D.E. Harrison (submitted to J. Climate)

  2. Warm-event US impacts Smith et al. (1999) J. Climate

  3. Rationalefor an OLR-ENSO Index Conditions during lists of years of extreme ENSO-state provide a statistical basis for seasonal climate forecasting Tropical atmospheric heating anomalies provide a dynamical basis for tropical and extra-tropical ENSO-related seasonal climate anomalies OLR is offers a more direct link to anomalous atmospheric heating

  4. Region of interest: Eastern Central Pacific

  5. Region of interest: Eastern Central Pacific

  6. Eastern Central Pacific OLRA Index

  7. Event-like behavior

  8. Gaussian-type behavior

  9. Extra-Tropical Atmospheric Anomalies

  10. Conclusions A distinctive type of OLR behavior has been seen in the eastern central Pacific since OLR measurements have become reliably available. Events of 1982-83, 1986-87, 1991-92 and 1997-98 stand out from background variability. Substantial atmospheric circulation anomalies occur over the N. Pacific and N. America in years distinguished by OLR. The case for tropically-driven anomalies is less clear in years with ENSO-status based on some indices but that are not distinctive from an OLR perspective. It makes sense to classify the OLR-distinguished events differently from others. The OLR events were often distinguished in time to be of some use to DJF and later seasonal climate prediction efforts, though operational SSTA indices usually gave earlier indications.

More Related