Comparisons of airborne lidar measurements of ozone with airborne in situ measurements during the 1995 Southern Oxidants Study

Alvarez, R. J.; Senff, Christoph J.; Hardesty, R. Michael; Parrish, D. D.; Luke, Winston T.; Watson, Thomas; Daum, P. H.; Gillani, Noor V.

doi:10.1029/98jd02745

Cited by 21 publications

(16 citation statements)

References 20 publications

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“…Errors in the ozone flux, production rate, and enhancement retrievals are influenced by a number of factors. The lidar ozone measurements at 90 m vertical and at 650 m horizontal resolution have a precision of about 3–10% and an accuracy of a few percent [ Alvarez et al , 1998, 2008]. For the retrievals described here, the ozone data were either integrated vertically and horizontally across the plume (ozone flux, production rate) or averaged vertically (ozone enhancement).…”

Section: Discussionmentioning

confidence: 99%

“…Ozone measurements in the Houston and Dallas/Fort Worth plumes were obtained with two different versions of the NOAA airborne ozone and aerosol lidar. The TexAQS 2000 ozone data were collected with an excimer laser‐based airborne ozone lidar that used five fixed wavelengths in the UV spectral region to detect ozone [ Alvarez et al , 1998]. The TexAQS 2000 missions were flown on a Douglas DC‐3 aircraft.…”

Section: Instrumentationmentioning

confidence: 99%

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Airborne lidar measurements of ozone flux downwind of Houston and Dallas

Senff¹,

Alvarez²,

Hardesty³

et al. 2010

J. Geophys. Res.

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[1] We use airborne lidar measurements of ozone collected during the Texas Air Quality Study (TexAQS) 2000 and TexAQS 2006 field campaigns to compute the horizontal flux of ozone downwind of the Houston and Dallas/Fort Worth metropolitan areas. Fluxes are computed for each aircraft transect by integrating excess ozone (plume ozone minus background ozone) in the urban plumes and multiplying the result by the horizontal wind speed provided by radar wind profilers. In addition, we use the lidar data to estimate ozone production rates and ozone enhancements in the Houston and Dallas/Fort Worth plumes. We found that the average horizontal flux of ozone emanating from the Houston area based on data from six research flights was 3.2 · 10 26 molecules per second. This was significantly higher than the flux measured downwind of Dallas/Fort Worth during a single flight. The Houston fluxes exhibited a strong dependence on wind direction. Under southerly or northerly flow, ozone fluxes were about twice as large as under westerly or easterly flow conditions. We estimate that a day's worth of export of ozone from the Houston area could raise regional background ozone by about 10 ppbv over a 40,000 km 2 area. This has important ramifications for air quality in communities downwind of Houston as it could raise background ozone levels enough that regions with little or no local pollution sources of their own may violate the federally mandated ozone standard.

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Section: Discussionmentioning

confidence: 99%

Section: Instrumentationmentioning

confidence: 99%

Airborne lidar measurements of ozone flux downwind of Houston and Dallas

Senff¹,

Alvarez²,

Hardesty³

et al. 2010

J. Geophys. Res.

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“…[83] The NOAA airborne ozone/aerosol differential absorption lidar (DIAL) [Alvarez et al, 1998] was deployed on a chartered DC-3 aircraft, also stationed at the Pease Tradeport. The nadir-looking lidar measured ozone profiles in the boundary layer with high spatial resolution (90 m vertical, 600 m horizontal) with a precision that varied between 5 and 15 ppbv, depending on the total atmospheric extinction.…”

Section: Appendix A: Mobile Platform Instrument Payloads and Deploymementioning

confidence: 99%

International Consortium for Atmospheric Research on Transport and Transformation (ICARTT): North America to Europe—Overview of the 2004 summer field study

et al. 2006

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[1] In the summer of 2004 several separate field programs intensively studied the photochemical, heterogeneous chemical and radiative environment of the troposphere over North America, the North Atlantic Ocean, and western Europe. Previous studies have indicated that the transport of continental emissions, particularly from North America, influences the concentrations of trace species in the troposphere over the North Atlantic and Europe. An international team of scientists, representing over 100 laboratories, collaborated under the International Consortium for Atmospheric Research on Transport and Transformation (ICARTT) umbrella to coordinate the separate field programs in order to maximize the resulting advances in our understanding of regional air quality, the transport, chemical transformation and removal of aerosols, ozone, and their precursors during intercontinental transport, and the radiation balance of the troposphere. Participants utilized nine aircraft, one research vessel, several ground-based sites in North America and the Azores, a network of aerosol-ozone lidars in Europe, satellites, balloon borne sondes, and routine commercial aircraft measurements. In this special section, the results from a major fraction of those platforms are presented. This overview is aimed at providing operational and logistical information for those platforms, summarizing the principal findings and conclusions that have been drawn from the results, and directing readers to specific papers for further details.

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“…Vertical cross section of logarithmic derivative of the range‐corrected aerosol backscatter d ( lnPz 2 )/ dz from the airborne ozone lidar flown during Nashville‐95 [ Alvarez et al , 1998]. The flight leg depicted here crossed Nashville from northwest to southeast on 12 July 1995 (Julian Day 193), as described in B98.…”

Section: Introductionmentioning

confidence: 99%

“…The Southern Oxidants Study 1995 Nashville intensive field‐measurement campaign during June and July 1995 (SOS‐95) was designed to study ozone formation in a modest‐sized, isolated city in the southeastern United States. The study, described by Cowling et al [1998] and Meagher et al [1998], included extensive surface‐based chemistry and meteorological measurements along with airborne measurements by several different types of instrumented aircraft [ Hübler et al , 1998; Alvarez et al , 1998].…”

Section: Introductionmentioning

confidence: 99%

Mixing‐height differences between land use types: Dependence on wind speed

Banta¹,

White

2003

J. Geophys. Res.

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[1] Mixing height and its spatial variation are important for a variety of issues and applications. In a previous study in the region around Nashville, Tennessee, we found a significant difference in the daytime mixed-layer inversion height z i between the area to the north and west of the city and the area to the south and east. These observations were from 3 days of very light daytime winds. The subregion to the north and west is deciduous forest, and that to the south and east is agricultural and mixed forest land. The differences in z i , which we are referring to as Á z i , were attributed to differences in surface heat flux characteristics arising from the land use variation. In the present study we investigate the effects of increasing wind speed on Á z i between the subregions, using a sample of 15 dry days from Southern Oxidants Study 1995. As convective boundary layer (CBL) wind speeds increased from ]1 to 6 m s À1 , Á z i decreased from 600 m to negligible. We found that an increase in shear-generated turbulence in the CBL was a probable factor in this decline. Two light-wind days that followed days with widespread rainfall were also noted. The Á z i on these days were small. Thus either strong winds or widespread surface moisture availability were able to nullify the effects of the land use/surface heat flux differences on Á z i between the two subregions.

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Comparisons of airborne lidar measurements of ozone with airborne in situ measurements during the 1995 Southern Oxidants Study

Cited by 21 publications

References 20 publications

Airborne lidar measurements of ozone flux downwind of Houston and Dallas

Airborne lidar measurements of ozone flux downwind of Houston and Dallas

International Consortium for Atmospheric Research on Transport and Transformation (ICARTT): North America to Europe—Overview of the 2004 summer field study

Mixing‐height differences between land use types: Dependence on wind speed

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