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ALOHA vs K2 water properties

ALOHA vs K2 water properties. VISCOSITY: -colder T at K2 makes it more viscous than ALOHA. SIGMA THETA: -colder T at K2 makes it more dense than ALOHA -larger gradient at ALOHA from bigger T gradient. Pellet lengths (data from Stephanie Wilson) *significantly different than other depths.

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ALOHA vs K2 water properties

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  1. ALOHA vs K2 water properties VISCOSITY: -colder T at K2 makes it more viscous than ALOHA SIGMA THETA: -colder T at K2 makes it more dense than ALOHA -larger gradient at ALOHA from bigger T gradient

  2. Pellet lengths (data from Stephanie Wilson) *significantly different than other depths ALOHA: 131um K2: 291um 122.29 329.17 131 300.79 138.11 227.51* K2d1: 324um K2d2: 278um 283.79 400.09 300.79 201.88* 238.59* vertigostokesvelocity.m

  3. Pellet widths (data from Stephanie Wilson) *significantly different than other depths ALOHA: 80um K2: 100um 76.92 101.93* 122.19* 84.62 79.26 89.71* K2d1: 104um K2d2: 100um 96.8 110.22* 122.19* 89.38* 89.71 vertigostokesvelocity.m

  4. Vsphere= g d2  Vcyl= 0.079gL2(L/d)-1.664  Komar et al. 1981 Settling velocities Effect of seawater differences only -higher viscosity at K2 slows particles down -K2 SW also more dense, so smaller difference in particle-SW density With particle density diffs too -particles at K2 are ~30% more dense than at ALOHA, overtaking the seawater differences

  5. Vsphere= g d2  Vcyl= 0.079gL2(L/d)-1.664  Settling velocities Effect of seawater differences only -higher viscosity at K2 slows particles down -K2 SW more dense, but ALOHA has high density gradient ALOHA: 220-320 m/d K2: 190 m/d Seawater+size K2 particles are bigger; overtake seawater differences ALOHA: 250-325 m/d K2: 375 m/d

  6. Vsphere= g d2  Vcyl= 0.079gL2(L/d)-1.664  Settling velocities Seawater+size K2 particles are bigger; overtake seawater differences ALOHA: 250-325 m/d K2: 375 m/d Seawater+size+composition K2 particles are denser too; accentuates difference in velocities ALOHA: 150-200 m/d K2: 450 m/d

  7. Settling velocities with size and composition Seawater+size+composition K2 particles are bigger and more dense ALOHA: 150-200 m/d K2: 450 m/d Seawater+size+composition+ 80% porosity 80% porosity slows the particles down by a factor of ~5 ALOHA: 30-40 m/d K2: 90 m/d

  8. Settling velocities and porosities ALOHAd1 K2Deploy1 K2Deploy2 Calculated settling velocities (m/d) from POC Flux and 55-350um concentrations (ALOHA:>53um; K2:55-350um) (bulk) • 150 18.38 28.60 17.52 • 300 29.00 43.22 10.07 • 500 17.00 22.73 17.74 Calculated porosities of particles to account for above settling velocities, assuming a sphere of d=100um (Ws = g* *d2  ) • 150 0.887 0.854 0.905 • 300 0.782 0.791 0.947 • 500 0.849 0.890 0.907 vertigostokesvelocity.m

  9. Settling velocities: Varying porosities at K2

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