University:
Widener University
Course:
ESSC 103 | Intriduction To Earth Science
Academic year:

2023
Views:

276

Pages:

1
Author:

Persingqyj

Inversion of Gulf Stream Proﬁles Geostrophic calculation We have prepared a section across the Gulf Stream at 70 W. There actually has been a lot of processing to get to this point – the proﬁles were averaged and smoothed, etc. You can contour this using the links on the page. Look at the geostrophic velocity calculated from the exact dynamic height and compare it to that calculated from σθ ∂ g ∂ u= σθ ∂z f0 ρ0 ∂y What are the diﬀerences? PV calculation You can calculate the PV from either the full geostrophic velocity or the version calculated from σθ . You just need to set the appropriate ﬁeld in the menu; you can also use various forms of PV 1 ∂σθ No velocity −f ρ0 ∂z 1 ∂σθ 1 ∂u ∂σ θ horiz=0 −f + ρ0 ∂y ∂z ρ0 ∂z 1 ∂σθ 1 ∂u ∂σθ horiz=1 −f + ρ0 ∂y ∂z ρ0 ∂z 1 ∂σθ 1 ∂u ∂σθ 1 ∂u ∂σθ horiz=2 −f + − ρ0 ∂y ∂z ρ0 ∂z ∂y ρ0 ∂z See what diﬀerences these make. Inversion You can now invert the various forms of PV and compare the velocities to the original data. In addition, you can add extra surface gradients or interior sources.Try various combinations of PV ﬁeld and linear/nonlinear inversions. Note that any functions for “q,” “strat,” “sigs,” or “sigb” will be added to the values. Can you make an artiﬁcial PV structure which gives a fairly realistic ﬂow?