1 / 9

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.

ugo
Télécharger la présentation

ALOHA vs K2 water properties

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related