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Layered Structures Detected in GroundWinds (New Hampshire) Data

Layered Structures Detected in GroundWinds (New Hampshire) Data. RAMA VARMA RAJA MK, CIRA & ORA Rama.Mundakkara@noaa.gov Jim Yoe, NOAA/NESDIS/ORA james.g.yoe@noaa.gov. Data Used. From the September, 2000 GW Demonstration Campaign GroundWinds Aerosol-Molecular Ratio (AM)

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Layered Structures Detected in GroundWinds (New Hampshire) Data

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  1. Layered Structures Detected in GroundWinds (New Hampshire) Data RAMA VARMA RAJA MK, CIRA & ORA Rama.Mundakkara@noaa.gov Jim Yoe, NOAA/NESDIS/ORA james.g.yoe@noaa.gov Layer in GroundWinds Data - RVRMK & JGY

  2. Data Used • From the September, 2000 GW Demonstration Campaign • GroundWinds Aerosol-Molecular Ratio (AM) • AM = ( Number of aerosol photons)/(Total number of photons) • Local Radiosonde • Vertical Temperature profiles (T) • Vertical Profiles of Relative Humidity (RH or q) • ETA Model Analysis • Vertical Profiles of Relative Humidity • Vertical profiles of vertical velocity

  3. Time_Height Section of AM 09/25/00, 14:43:04-15:44:04 (Z)LT = 10:43-11:44 • Note maxima @ • In the BL • ~ 5 – 6 km • ~ 9 – 11 km

  4. Time-Height Section, 09/25/00, 16:17-18:20 (Z)12:17-14:20 (Local noon) • Diurnal Variation; Layers replaced by low A/M thru entire troposph.

  5. 09/25/00, 19:19-20:17 (Z)15:19-16:17 (Local evening) Layers return @ evening’s onset

  6. 09/25/00, 22:56-24:38 (Z)18:56-20:38 (Local Time Night) • Strong layering • At 9 – 10 km cirrus cloud with fine scale structures

  7. 09/26/00, 14:22-17:02 (Z)10:22-13:03 (Local morning time to noon) • Cirrus layer breaking, descending

  8. 09/26,19:37-20:51 (Z)15:37-16:51 (Local evening) • Cirrus layer @ ~ 5 km

  9. 09/27, 14:27-15:25 (Z)10:27-11:25 (Local Time) • Layers not apparent; • Convection?

  10. Vertical Profiles • Comparison with ETA model analyses • Fine scale enhanced structures in GWM AM Ratio and Relative Humidity profiles

  11. Tendency for Vertical Gradient of RH to be positive near the layers of increasing vertical velocity convergence

  12. Sep 25

  13. Sep 25

  14. SUMMARY • Can detect layers using GW A/M as “tracer” • Layers show diurnal variation • RS Relative Humidity & ETA Model Analysis Relative Humidity show corresponding layered structures • Comparison with ETA model analysis of vertical velocity suggests that the enhanced aerosol/RH layers in the upper troposphere are tending to occur in the layers of vertical velocity convergence • It would be interesting to compare these layered structures with the directly observed vertical velocity profiles

  15. 09/27/00, 17:29-18:45 (Z)13:29-14:45 (Local Evening) • Layered Structure starts restoration • Relative minimum in the free troposphere between 2 and 8 km levels

  16. 09/27/00, 19:57-20:29 (Z)15:57-16:30 (Local Time Evening) • Layered Structure reappears

  17. 09/27, 20:35-21:36 (Z)16:35-17:31 (Local evening to night) • Layered structure

  18. 09/28, 20:46+ >8hrs (Z)16:46+>8hrs (Local Evening to night time) • Distorted Layered Structure • Descending Cirrus Cloud

  19. SUMMARY • Spatial Contour patterns of Vertical Velocity from temporally nearest ETA model analysis also suggests the existence of alternate upward and downward motions horizontally and do show a pattern of 500 km to 1000 km wavelength • Possibly these are inter-mediate scale inertio-gravity waves and layered structure might be related to these waves. However, more investigations are necessary to bring out this possibility in a clear way.

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