Evolution and Impact of an Upwind Coastal Jet

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Presentation transcript:

Evolution and Impact of an Upwind Coastal Jet Bob Chant1 and Scott Glenn1 1Rutgers University Ocean Science Meeting - San Antonio, TX January, 2000

Along Shore Wind Stress July 1998 Ocean Currents in the LEO-15 Area Today’s Talk dyne/cm2 Ocean Currents in the LEO-15 Area on July 23, 1998 at 08:20 GMT

Ocean Currents in the LEO-15 area ADCP Sections July 21, 1998 - 11:30 GMT Ocean Currents in the LEO-15 area July 23, 1998 - 08:20 GMT

Temperature (contours) July 23 - 3rd Transect Along-shore Currents (color) and Temperature (contours) 14o 22o 18o July 24 - 3rd Transect 30 20 10 -10 -20 -30 N o r t h S u cm/sec

July 23, 1998 - Detided Along Shelf Velocity Downshelf Transport 31.7 km3/s Downshelf Transport 29.4 km3/s Downshelf Transport 22.6 km3/s

Transport upshelf/downshelf 195 196 197 198 199 200 201 202 203 204 205 Wind Stress 195 196 197 198 199 200 201 202 203 204 205 1.0 .75 .5 .25 -.25 -.5 -.75 -1.0

Along-Shore Surface and Bottom Transport and Along-shore Wind Stress m2/s dyne/cm2 195 196 197 198 199 200 201 202 203 204 205 Offshore Mooring Cross-Shore Surface and Bottom Transport and Along-shore Wind Stress 195 196 197 198 199 200 201 202 203 204 205 195 196 197 198 199 200 201 202 203 204 205 m2/s dyne/cm2

Transport Upshelf/Downshelf 195 196 197 198 199 200 201 202 203 204 205 m3/s *103 Transport Upshelf/Downshelf 195 196 197 198 199 200 201 202 203 204 205

Along-Shore Surface and Bottom Trasport and Along-Shore Wind Stress Node B Along-Shore Surface and Bottom Trasport and Along-Shore Wind Stress Node B dyne/cm2 m2/s 195 196 197 198 199 200 201 202 203 204 205 Node B Cross-Shore Surface and Bottom Trasport and Along-Shore Wind Stress dyne/cm2 m2/s 195 196 197 198 199 200 201 202 203 204 205

Alongshore Transport at Node B m2/s m3/s 195 196 197 198 199 200 201 202 203 204 205 Wind Stress Along Shore dyne/cm2 Cross Shore 195 196 197 198 199 200 201 202 203 204 205

195 196 197 198 199 200 201 202 203 204 205

Two Numbers equal to the volume of a semicircle of fluid 20m deep and a diameter of 15 nm If jet converges over a 50 km length scale it would provide the additional offshore transport observed at the offshore mooring. 2D Upwelling + Along-Shore Convergence = 3D Upwelling

What is the fate of the coastal jet as it impinges on shoaling Distance (km) What is the fate of the coastal jet as it impinges on shoaling and rougher topography?

Conclusions 1) AVHRR imagery reveals an upwelling center which translates down the coast and extends offshore. 2) Towed ADCP data revels an upwind-near-shore-jet during upwelling favorable conditions. The jet tends to have a mid depth maximum and resides in the center of spreading isopyncals. 3) The jet’s appearance was coincident with a maximum in the along shore wind stress and spins up within an inertial period. 4) Moored data indicate that off shore transport at the surface is consistent with Ekman transport prior to the jets appearance. However, as the near shore jet develops off shore transport exceeds the Ekman transport. We suggest that the increased offshore transport due to offshore transport of fluid in the Jet. 5) The volume of fluid transported by the jet is consistent with the volume of the upwelling center. We speculate that the evolution of the upwelling center and its offshore extent is related to the jet impinging on shoaling and rougher topography.