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1000 hPa Z/Geo Rel Vort at t0

This text provides calculations and analysis of the factors contributing to cyclogenesis, including Geo RelVort, GAVA, LTHAD, LAD, LDIA, and latent heat release.

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1000 hPa Z/Geo Rel Vort at t0

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  1. 1000 hPa Z/Geo RelVort at t0 + +

  2. 1000 hPa Z/Geo RelVort at t1 +

  3. F18 GAVA (x 10-9 s-2); negativeat F24 position + -0.1 x 10-9 s-2 Giving a negative GAVA contribution to cyclogenesis

  4. F18 nearly LTHAD (x 10-13 m-1s-1); negative at F24 position + -[9.81 m s-2/ (11.1417x10-5s-1)]*(-1.60 x10-13m-1s-1) = +14.09 x 10-9s-2 So, multiply by –g/f, giving a positiveLTHAD contribution to cyclogenesis

  5. F18 nearly 700 hPa LAD (x 10-13 units); positive at F24 position + 14.09 x 10-9s-2 * 85% = -11.97 x 10-9s-2 So, multiply by –g/f, giving a negativeLAD contribution to cyclogenesis

  6. F18 nearly LDIA; latent heat release at F24 position + 11.97 x 10-9s-2* 70% = +9.989 x 10-9s-2 ω < 0 mb s-1 & RH ≥ 70%

  7. Calculations Sum of terms on RHS = GAVA + LTHAD + LAD + LDIA = +10.395 x 10-9 s-2 Finite difference approximation of LHS = dGRV/dt = [(28 – 18]) x 10-5 s-1 ] / [6 h * 60 min/h * 60 s/min] = +4.6296 x 10-9 s-2 RHS = 2.245 x LHS

  8. 300 hPa Z, Div at t0 + [+]

  9. 300 hPa Z, GAVA at t0 + [-]

  10. 300 hPa Z, Temp Adv at t0 + [-]

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