Rossby wave breaking (RWB) Definition Detection / Measurement Climatology Dynamics – Impact on internal variability (NAO / NAM) – Impact on surface turbulent.

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Presentation transcript:

Rossby wave breaking (RWB) Definition Detection / Measurement Climatology Dynamics – Impact on internal variability (NAO / NAM) – Impact on surface turbulent heat flux (PDO)

Definition 350 K Potential Vorticity, 1-8 July Wave amplitude reaches critical level - Irreversible overturning of isentropic potential vorticity PVU Data: NCEP / NCAR Reanalysis

PVU Anticyclonic RWB Cyclonic RWB Detection / measurement Centroid of low-P lobe

Climatology: DJF Antic Cycl contours are relative frequency shading is zonal extent

Climatology Relative frequency:

Rossby wave breaking (RWB) Definition Detection / measurement Climatology Dynamics – Impact on internal variability (NAO / NAM) – Impact on surface turbulent heat flux (PDO)

Dynamics Impact on internal variability (NAO / NAM) – Forces the background flow via, primarily, eddy momentum flux convergence – Generates surface pressure anomalies Impact on surface turbulent heat flux (PDO) – Generates coherent, 3D circulations associated with temperature and moisture anomalies

Forcing of background flow Look at composite divergence of E fields around hundreds of RWB centroids Hoskins et al. (1983)

SLP

Regions where RWB forces NAO Pos. Neg.

Dynamics Impact on internal variability (NAO / NAM) – Forces the background flow via, primarily, eddy momentum flux convergence – Generates surface pressure anomalies Impact on surface turbulent heat flux (PDO) – Generates coherent, 3D circulations associated with temperature and moisture anomalies

Pacific Decadal Oscillation Leading pattern of extratropical Pacific sea surface temperature variability Data: NOAA ESRL SST V2 “warm” “cool”

Pacific Decadal Oscillation Alexander et al. (2002) Journal of Climate Anticyclonic and cyclonic RWB

D D Negative indicates into the ocean Anticyclonic RWB Composite of 200 randomly Selected winter cases

U U Negative indicates into the ocean Cyclonic RWB Composite of 200 randomly selected winter cases

RWB Variability (EOFs) Relative frequency: All four patterns are significantly correlated with the current and future PDO (e.g., January)

Effect of Cyclonic Dec-Jan RWB

200 randomly selected cases

Effect of Cyclonic Dec-Jan RWB 200 randomly selected cases

Effect of Anticyclonic Jul-Aug RWB 200 randomly selected cases

RWB Variability (EOFs) Relative frequency: All four patterns are significantly correlated with the current and future PDO (e.g., January)

Statistical Model of PDO using RWB Cross validation Stepwise bootstrapping Model any month

Rossby wave breaking (RWB) Definition Detection / Measurement Climatology Dynamics – Impact on internal variability (NAO / NAM) – Impact on surface turbulent heat flux (PDO)

Rossby wave breaking PVU 350 K, July 1998, NCEP / NCAR Reanalysis data - Wave amplitude reaches critical level - Irreversible overturning of isentropic potential vorticity PVU

Cyclonic Rossby wave breaking PVU Potential vorticity on the 350-K surface, January 2003 PVU