Tropospheric Ozone Laminar Structures and Vertical Correlation Lengths. Michael J. Newchurch 1 , Guanyu Huang 1 , Brad Pierce 3 , John Burris 2 , Shi Kuang 1 , Wesley Cantrell 1 , Lihua Wang 1 , Patrick I. Buckley 1 , Steve Johnson 4 , Kevin Knupp 1 , Dustin Phillips 1
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Tropospheric Ozone Laminar Structures and Vertical Correlation Lengths
Michael J. Newchurch1, Guanyu Huang1, Brad Pierce3, John Burris2 , Shi Kuang1,
Wesley Cantrell1, Lihua Wang1, Patrick I. Buckley1 , Steve Johnson4, Kevin Knupp1, Dustin Phillips1
1University of Alabama in Huntsville, 2NASA/Goddard Space Flight Center,
3University of Wisconsin-Madison, 4NASA/Marshall Space Flight Center
Ozone laminae frequently occur in ozonesonde and DIAL profiles. These ozone layers have significant potential implications for a variety of dynamic and chemical atmospheric processes and energy budgets (Newell et. al,. 2001). However, we have limited understanding of the mechanisms involving ozone layers and models rarely reproduce these laminae. (Colette et al., 2005a and 2005b,Stoller et al., 1999, Newell et al., 2001, Thouret et al., 2001).Based on two independent methods (Gradients and Wavelets), we study the morphology of ozone laminar structure and its applications to models and satellite retrievals. 10-year Huntsville ozonesonde data show a strong seasonal variation and the ubiquity of ozone laminae. DIAL profiles provide continuous observation of the sub-hourly evolution of atmospheric processes involving ozone laminae.
GEO-CAPE will measure tropospheric gases and aerosols at ~8km and hourly resolution. Vertical resolution is on the order of 5-10km in the troposphere. This vertical resolution is inadequate to resolve laminar structures that characterize tropospheric ozone and aerosols. Furthermore, GEO-CAPE information content in the PBL will likely be inadequate to resolve the processes responsible for air quality variability. We seek, therefore, to augment the space-borne measurements with a ground-based measurement system.
Ozonesondes are extensively used in various atmospheric chemistry studies because of their low upfront cost and well-characterized behavior. However, the whole process for a sonde launch typically requires four hours. And four-hour ozonesonde resolution is prohibitively expensive. We therefore consider a lidar network to provide the necessary spatial and temporal resolution.
3. Ozone Laminae and Correlation Lengths
4. Nocturnal Jet Ozone Transport and STE
Oct. 4 2008
Low frequency of layers near tropopause
Co-located wind profiler
Aerosol ext.coeff. at 291nm from O3 DIAL
High frequency of layers below tropopause
Co-located ceilometer backscatter
Figure 1 Seasonal variations occur in altitudinal distributions. Layer height WRT to tropopause height.
Figure 2 seasonal correlation of surface ozone w/ ozone aloft. Ozone in FT is not correlated with surface ozone
Figure 6. Huntsville DIAL observes an ozone enhancement in the residual layer from the late evening to midnight on 4 Oct. 2008 due to the nocturnal jet ozone transport.
Ozone DIAL retrieval
Figure 7. A Stratosphere- troposphere exchange (STE) observed by Huntsville DIAL and Huntsville ozonesondes at April, 2010
5. RAQMS and Ozone DIAL Comparison
Daytime PBL top collapsed
EPA Surface Data
Figure 8. The comparisons between RAQMS results with 1° by 1° horizontal resolution and ozone DIAL observations, May 4- 7 2010.
Figure 4. correlation between EPA surface ozone and ozone aloft based on Huntsville ozone DIAL profiles. EPA local measurement is located 4.5 miles southeast of Huntsville DIAL. Laminar structures cause anomalous behavior in correlation.
Figure 5. Ozone observation of 4-hour temporal resolution (upper panel) vs. 10-min temporal resolution (DIAL data , lower panel)
NOAA ESRL Global Monitoring Annual Meeting, May 17-18, 2011 Boulder CO.