Comparison of Wintertime Mesoscale Winds Over the Ocean Around Southeastern Greenland in WRF and ERA-Interim

TitleComparison of Wintertime Mesoscale Winds Over the Ocean Around Southeastern Greenland in WRF and ERA-Interim
Publication TypeJournal Article
Year of Publication2016
AuthorsDuVivier, Alice K., and Cassano John J.
JournalClimate Dynamics
Volume46
Number7-8
Pages2197-2211
Date Published04/2016
Abstract / Summary

Strong, mesoscale tip jets and barrier winds that occur over the ocean near southern Greenland have the potential for impacting deep convection in the ocean. The self-organizing map (SOM) training algorithm was used to identify and classify the range of 10 m wind patterns present during ten winters (1997–2007, NDJFM) in the ECMWF interim reanalysis (ERA-I) and from a regional simulation using the weather research and forecasting (WRF) model at 50 km into a SOM. The SOM is used to identify differences in the manifestation of westerly tip jets, easterly tip jets, and barrier ow. The North Atlantic Oscil- lation (NAO) index is well correlated with the type of tip jet present at Cape Farewell, but the NAO was not well cor- related with the absence or presence of barrier ow. WRF simulated patterns with strong barrier-parallel ow more frequently than ERA-I, and WRF also had faster coastal winds than ERA-I during all types of strong wind events. The difference in coastal winds is likely related to model resolution and the resulting ability of each model to simu- late strong mesoscale winds that are driven by Greenland’s steep terrain.

URLhttps://doi.org/10.1007/s00382-015-2697-8
DOI10.1007/s00382-015-2697-8
Journal: Climate Dynamics
Year of Publication: 2016
Volume: 46
Number: 7-8
Pages: 2197-2211
Date Published: 04/2016

Strong, mesoscale tip jets and barrier winds that occur over the ocean near southern Greenland have the potential for impacting deep convection in the ocean. The self-organizing map (SOM) training algorithm was used to identify and classify the range of 10 m wind patterns present during ten winters (1997–2007, NDJFM) in the ECMWF interim reanalysis (ERA-I) and from a regional simulation using the weather research and forecasting (WRF) model at 50 km into a SOM. The SOM is used to identify differences in the manifestation of westerly tip jets, easterly tip jets, and barrier ow. The North Atlantic Oscil- lation (NAO) index is well correlated with the type of tip jet present at Cape Farewell, but the NAO was not well cor- related with the absence or presence of barrier ow. WRF simulated patterns with strong barrier-parallel ow more frequently than ERA-I, and WRF also had faster coastal winds than ERA-I during all types of strong wind events. The difference in coastal winds is likely related to model resolution and the resulting ability of each model to simu- late strong mesoscale winds that are driven by Greenland’s steep terrain.

DOI: 10.1007/s00382-015-2697-8
Citation:
DuVivier, AK, and JJ Cassano.  2016.  "Comparison of Wintertime Mesoscale Winds Over the Ocean Around Southeastern Greenland in WRF and ERA-Interim."  Climate Dynamics 46(7-8): 2197-2211.  https://doi.org/10.1007/s00382-015-2697-8.