Observations and Modelling of Fronts and Frontogenesis
Observations and Modelling of Fronts and Frontogenesis
Observations and Modelling of Fronts and Frontogenesis
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continuously stratified case (with distributions <strong>of</strong> stress<br />
divergence <strong>and</strong> heating constrained to match those <strong>of</strong> the<br />
original layer 1), the equations analogous to (1) <strong>and</strong> (3)<br />
Ut + vuy + wu - fv (rX(z) 7e(Z))/hl, (Al)<br />
fu Py/PO'<br />
(A2)<br />
Pz -gp, (A3)<br />
vy+wzO<br />
(A4)<br />
Pt + VPy + WPz [-aQ(z)/c + (i Pl)e(z)]/hl. (A5)<br />
Here u, v, w, p, <strong>and</strong> p are functions <strong>of</strong> y, z, <strong>and</strong> t. The<br />
advective terms wu <strong>and</strong> WPz must be retained because <strong>of</strong> the<br />
vertical dependence <strong>of</strong> u <strong>and</strong> p. Layer 3 still obeys the<br />
equations (2) with i 3. For reference, we note the<br />
identities,<br />
(B)y (y)B zBhy (B)t (t)B zB't (A6)<br />
where is any dependent variable in the composite layer, h =<br />
h1 + h2 is the depth <strong>of</strong> the composite layer, <strong>and</strong> subscript B<br />
means evaluation at z = -h(y,t), the base <strong>of</strong> the composite<br />
layer.<br />
gives,<br />
Integrating the hydrostatic equation (2c) vertically<br />
P3 PB - gp3(z + h). (A7)<br />
Then the use <strong>of</strong> (20) yields the thermal wind relation,<br />
POf(UB - u3) = [(Py)B P3yI - B(P3 PBThy (A8)<br />
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