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A Maloney Group, Weak Temperature Gradient Balance Perspective

A Maloney Group, Weak Temperature Gradient Balance Perspective. Large-scale circulation response alters moisture field. Precipitation is a strong increasing, non-linear function of lower free tropospheric humidity. ????. MJO.

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A Maloney Group, Weak Temperature Gradient Balance Perspective

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  1. A Maloney Group, Weak Temperature Gradient Balance Perspective

  2. Large-scale circulation response alters moisture field Precipitation is a strong increasing, non-linear function of lower free tropospheric humidity ???? MJO Diabatic heating profile result of integrated effects of cloud population and radiation Diabatic heating structure influences large-scale circulation response

  3. SLHF OLR in ERAi Eddy Mixing import neutral/export export

  4. What is the phase relation of these terms? Do the answers to these questions change dramatically with location? What terms are dominant?

  5. pole-equator moisture gradient westerly mean state west-east moisture gradient easterly mean state east-west moisture gradient easterlies poleward of ~7.5°

  6. An Old Problem

  7. Where is the MJO? The RMM index only gives us a rough estimate At what phase is the MJO “directly over” the DYNAMO domain? How about TOGA-COARE?

  8. A New Diagnostic

  9. 90° gridpoint phase 180° 0° 270° each gridpoint has its own “phase”

  10. 90° RMM phase gridpoint phase 180° 0° 270° corresponds to RMM phase of maximum (+) MJO related anomaly in a variable EX: for zonal wind this corresponds to maximum westerly winds

  11. 90° gridpoint phase 180° 0° RMM phase 270° corresponds to RMM phase of maximum (-) MJO related anomaly in a variable EX: for zonal wind this corresponds to maximum easterly winds

  12. 45°prior to maximum (+) anomaly 90° RMM phase gridpoint phase 180° 0° 270° Tells you where you are in MJO lifecycle

  13. 45°after maximum (+) anomaly 90° RMM phase gridpoint phase 180° 0° 270° Tells you where you are in MJO lifecycle

  14. DYNAMO TOGA-COARE Identifies at what “RMM” phase <q> maximizes at each location Objectively calculated from EOF structure

  15. Does it work?

  16. Composites as a function of MJO lifecycle

  17. Suppressed Transition to Enhanced Enhanced Transition to Suppressed Suppressed

  18. Suppressed Transition to Enhanced Enhanced Transition to Suppressed Suppressed

  19. Suppressed Transition to Enhanced Enhanced Transition to Suppressed Suppressed

  20. Suppressed Transition to Enhanced Enhanced Transition to Suppressed Suppressed

  21. Point #1: Phasing Changes

  22. <q> (850-500) Peak of convection

  23. October-April Column Integrated MSE Budget

  24. MSE Composite Analysis RMM > 1Composite as function of MJO lifecycle at each location using new diagnostic

  25. Suppressed Transition to Enhanced Enhanced Transition to Suppressed Suppressed

  26. Suppressed Transition to Enhanced Enhanced Transition to Suppressed Suppressed

  27. Suppressed Transition to Enhanced Enhanced Transition to Suppressed Suppressed

  28. Point #2: Phasing Matters Point #3: Mean State Matters

  29. Suppressed Transition to Enhanced Enhanced ? ? Transition to Suppressed Suppressed

  30. Just after peak of convection SLHF Substantial cancelation in lat. average

  31. Suppressed Transition to Enhanced Enhanced Transition to Suppressed Suppressed

  32. Suppressed Transition to Enhanced Enhanced Transition to Suppressed Suppressed

  33. Near complete cancelation, all times, everywhere Suppressed Transition to Enhanced Enhanced Transition to Suppressed Suppressed Radiation Dominant….. Missing Physics?

  34. Horizontal Advection SLHF Suppressed Transition to Enhanced Enhanced Transition to Suppressed Suppressed

  35. Point #4: In ERAi, horizontal advection drives tendency

  36. Point #5: Local vs. large-scale processes at work Meridional advection is small locally and does not correspond with intraseasonal OLR maxima, but is very large in lat. average. - Conditions tropics on large scale Zonal advection and SLHF are very large locally and correspond with intraseasonal OLR maxima, but are very weak in lat. average. - Helps determine locations of maximum intraseasonal variance

  37. Questions

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