amp its relation with trace gas transport ATTREXCONTRASTCAST Science Team Meeting Oct 2014 JiEun Kim University of Colorado Boulder CO M Joan Alexander NWRAColorado Research Associates Boulder CO ID: 1026045
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1. A fine vertical wave structure & its relation with trace gas transportATTREX/CONTRAST/CAST Science Team Meeting, Oct, 2014 Ji-Eun KimUniversity of Colorado, Boulder, COM. Joan AlexanderNWRA/Colorado Research Associates, Boulder, COThanks to the ATTREX team!
2. A wave study is one of the objectives of ATTREX.We planned and had a wave flight (7deg) at a near-constant altitude (RF04).We happened to have another wave flight (RF02).
3. Stuck in the UA zone? Unprecedented wave measurements!GuamGH path on Feb 16-17~0.5-1 hourly ~24 vertical profileslike continuous radio-/dropsonde
4. Datasets: Large scale to small scaleMERRAwell represents slow, large scalesMLS COLarge scale tracer distribution in the TTLGuam radiosonde2/day meteorological measurementsGood vertical and frequency wave structureGlobalHawkMeteorological fields with tracersVery high vertical, time resolution (0.5-1 hourly) CPL clouds* Everything in log-pressure altitude for comparison, except for CPL
5. Mean fields show typical Gill-type DJF TTL.No strong wind near GuamMean temperature and winds
6. MERRA evolution (Day -6)Strong cyclonic circulation in TTL near GuamTemperature and wind anomaly
7. MERRA evolution (Day -4)Cyclonic Rossby wave circulation propagating eastwardTemperature and wind anomaly
8. MERRA evolution (Day -2)Cyclonic Rossby wave circulation propagating eastwardTemperature and wind anomaly
9. MERRA evolution (Day 0)No strong large-scale disturbances in Guam Temperature and wind anomaly
10. MERRA evolution (Day +2)A Rossby wave anti-cyclonic motion developedTemperature and wind anomaly
11. MERRA evolution (Day +4)Rossby wave anti-cyclonic circulation propagating eastwardTemperature and wind anomaly
12. Measurement Day (Day 0)The day was right in the middle of strong cyclonic and anti-cyclonic motions.This is consistent with radiosonde observations.It looks nothing is going on near Guam.Temperature and wind anomaly
13. 30-day Guam radiosonde shows the same featureThe day was right in the middle of strong cyclonic and anti-cyclonic motions.This is consistent with radiosonde observations.Meridional wind anomaly
14. Actual atmosphere was not boring!TemperatureZonal UMeridional V
15. TemperatureZonal UMeridional V
16. Opposite phase of U and V Gravity waves with vertical wavelength ~ 1.7 km Analysis model vertical resolution near TTL ~1.2 km can resolve ~2.4 km scales at most
17. Current models cannot resolve the scale.GHGFS
18.
19. Vertical mixing? Horizontal transport?Waves induce vertical and horizontal motions.17 km layer is vertically well mixed.15 km layer has enhanced tropospheric air with northerly wind.
20. More tropospheric air is distributed north of Guam Northerly wind (-v) would transport higher CO into Guam.
21. Highest dehydration level ~ 15 kmEvidence of dehydrationCPL 532 nm
22. Evidence of dehydration
23. +v tropicssubtropicsdehydrated airEvidence of dehydration and meridional transport+v tropicssubtropicsstill moisture Water vapor is also transported by wave motions.+ V+ VDryWet
24. How often do these waves exist?SondeMERRA
25. Vertical wavelet (S-transform) analysisSondeMERRA
26. Short vertical wavelength spectrum is significantSondeMERRAAverage Spectrum @ TTL2.4 km wavelength
27. ConclusionA fine scale wave is observed.There is a strong correlation between meridional wind and tracers.A significant portion of TTL disturbances is attributed to short vertical wavelength waves.This is lacking in models, implying weaker vertical mixing and horizontal transport at these scales in models.
28.