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Oceanic Response to Overflows

Oceanic Response to Overflows. Shin Kida MIT/WHOI Joint Program November 10, 2004. Advisors: Jim Price and Jiayan Yang. Overflow and oceanic water are dynamically connected. My goal is to examine how the ocean responds to overflows. This consists of layer interaction and mixing.

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Oceanic Response to Overflows

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  1. Oceanic Response to Overflows Shin Kida MIT/WHOI Joint Program November 10, 2004 Advisors: Jim Price and Jiayan Yang

  2. Overflow and oceanic water are dynamically connected. • My goal is to examine how the ocean responds to overflows. This consists of layer interaction and mixing. • Layer interaction was examined by not allowing any mixing process

  3. Model Setup • HIM,2-layer model. • Dense water formation in the upper basin. • Physical space is close to the Faroe Bank Channel Overflow • Depth of the sill …… D=1000m • Topographic slope …… a=0.01 • Reduced gravity …… g’=0.005 m/s^2 • Outflow transport …… 2Sv

  4. Snap Shot Ekman number =n/f= 7.5e-6/1.4e-4 =0.05 < 0.15 (model) : Momentum to upper layer Strong eddies! roughly 20 cm/s

  5. Current Meter upper layer lower layer Lower layer velocity is always downstream: Strong Background Flow

  6. By only changing the upper layer thickness H=1000m H=2000m Increasing the layer thickness prevents baroclinic instability. This reduces the momentum transfer to the upper layer and thus can not drive a significant circulation in the upper layer.

  7. Time average upstream 0.25 downstream 0.05 Momentum transfer is done locally where the flow is unstable. This drive the upper layer flow. Downstream shows that the eddies flow according to the Ekman number.

  8. Adiabatic overflow and ocean interaction is also important! • Changes the dynamics of the overflow itself More wave like than a tube. • Steeper angle than the Ekman number shows the momentum loss to the ocean. • This momentum transfer is significant enough to drive eddies of strength 20cm/s and a mean flow of 10cm/s in the ocean layer.

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