The dryline on 22 May 2002 during IHOP_2002

Convective-scale measurements at the profiling site

Belay B. Demoz, Cyrille Flamant, Tammy M. Weckwerth, David Whiteman, Keith Evans, Frédéric Fabry, Paolo Di Girolamo, David Owen Miller, Bart Geerts, William Brown, Geary Schwemmer, Bruce Gentry, Wayne Feltz, Zhien Wang

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

A detailed analysis of the structure of a double dryline observed over the Oklahoma panhandle during the first International H2O Project (IHOP_2002) convective initiation (CI) mission on 22 May 2002 is presented. A unique and unprecedented set of high temporal and spatial resolution measurements of water vapor mixing ratio, wind, and boundary layer structure parameters were acquired using the National Aeronautics and Space Administration (NASA) scanning Raman lidar (SRL), the Goddard Lidar Observatory for Winds (GLOW), and the Holographic Airborne Rotating Lidar Instrument Experiment (HARLIE), respectively. These measurements are combined with the vertical velocity measurements derived from the National Center for Atmospheric Research (NCAR) Multiple Antenna Profiler Radar (MAPR) and radar structure function from the high-resolution University of Massachusetts frequency-modulated continuous-wave (FMCW) radar to reveal the evolution and structure of the late afternoon double-dryline boundary layer. The eastern dryline advanced and then retreated over the Homestead profiling site in the Oklahoma panhandle, providing conditions ripe for a detailed observation of the small-scale variability within the boundary layer and the dryline. In situ aircraft data, dropsonde and radiosonde data, along with NCAR S-band dual-polarization Doppler radar (S-Pol) measurements, are also used to provide the larger-scale picture of the double-dryline environment. Moisture and temperature jumps of about 3 g kg-1 and 1-2 K, respectively, were observed across the eastern radar fine line (dryline), more than the moisture jumps (1-2 g kg-1) observed across the western radar fine line (secondary dryline). Most updraft plumes observed were located on the moist side of the eastern dryline with vertical velocities exceeding 3 m s-1 and variable horizontal widths of 2-5 km, although some were as wide as 7-8 km. These updrafts were up to 1.5 g kg-1 moister than the surrounding environment. Although models suggested deep convection over the Oklahoma panhandle and several cloud lines were observed near the dryline, the dryline itself did not initiate any storms over the intensive observation region (IOR). Possible reasons for this lack of convection are discussed. Strong capping inversion and moisture detrainment between the lifting condensation level and the level of free convection related to an overriding drier air, together with the relatively small near-surface moisture values (less than 10 g kg-1), were detrimental to CI in this case.

Original languageEnglish (US)
Pages (from-to)294-310
Number of pages17
JournalMonthly Weather Review
Volume134
Issue number1
DOIs
StatePublished - Jan 1 2006

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radar
moisture
lidar
boundary layer
convection
updraft
capping
Doppler radar
profiler
radiosonde
mixing ratio
antenna
condensation
water vapor
aircraft
spatial resolution
polarization
observatory
plume
air

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

Demoz, B. B., Flamant, C., Weckwerth, T. M., Whiteman, D., Evans, K., Fabry, F., ... Wang, Z. (2006). The dryline on 22 May 2002 during IHOP_2002: Convective-scale measurements at the profiling site. Monthly Weather Review, 134(1), 294-310. https://doi.org/10.1175/MWR3054.1
Demoz, Belay B. ; Flamant, Cyrille ; Weckwerth, Tammy M. ; Whiteman, David ; Evans, Keith ; Fabry, Frédéric ; Di Girolamo, Paolo ; Miller, David Owen ; Geerts, Bart ; Brown, William ; Schwemmer, Geary ; Gentry, Bruce ; Feltz, Wayne ; Wang, Zhien. / The dryline on 22 May 2002 during IHOP_2002 : Convective-scale measurements at the profiling site. In: Monthly Weather Review. 2006 ; Vol. 134, No. 1. pp. 294-310.
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abstract = "A detailed analysis of the structure of a double dryline observed over the Oklahoma panhandle during the first International H2O Project (IHOP_2002) convective initiation (CI) mission on 22 May 2002 is presented. A unique and unprecedented set of high temporal and spatial resolution measurements of water vapor mixing ratio, wind, and boundary layer structure parameters were acquired using the National Aeronautics and Space Administration (NASA) scanning Raman lidar (SRL), the Goddard Lidar Observatory for Winds (GLOW), and the Holographic Airborne Rotating Lidar Instrument Experiment (HARLIE), respectively. These measurements are combined with the vertical velocity measurements derived from the National Center for Atmospheric Research (NCAR) Multiple Antenna Profiler Radar (MAPR) and radar structure function from the high-resolution University of Massachusetts frequency-modulated continuous-wave (FMCW) radar to reveal the evolution and structure of the late afternoon double-dryline boundary layer. The eastern dryline advanced and then retreated over the Homestead profiling site in the Oklahoma panhandle, providing conditions ripe for a detailed observation of the small-scale variability within the boundary layer and the dryline. In situ aircraft data, dropsonde and radiosonde data, along with NCAR S-band dual-polarization Doppler radar (S-Pol) measurements, are also used to provide the larger-scale picture of the double-dryline environment. Moisture and temperature jumps of about 3 g kg-1 and 1-2 K, respectively, were observed across the eastern radar fine line (dryline), more than the moisture jumps (1-2 g kg-1) observed across the western radar fine line (secondary dryline). Most updraft plumes observed were located on the moist side of the eastern dryline with vertical velocities exceeding 3 m s-1 and variable horizontal widths of 2-5 km, although some were as wide as 7-8 km. These updrafts were up to 1.5 g kg-1 moister than the surrounding environment. Although models suggested deep convection over the Oklahoma panhandle and several cloud lines were observed near the dryline, the dryline itself did not initiate any storms over the intensive observation region (IOR). Possible reasons for this lack of convection are discussed. Strong capping inversion and moisture detrainment between the lifting condensation level and the level of free convection related to an overriding drier air, together with the relatively small near-surface moisture values (less than 10 g kg-1), were detrimental to CI in this case.",
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Demoz, BB, Flamant, C, Weckwerth, TM, Whiteman, D, Evans, K, Fabry, F, Di Girolamo, P, Miller, DO, Geerts, B, Brown, W, Schwemmer, G, Gentry, B, Feltz, W & Wang, Z 2006, 'The dryline on 22 May 2002 during IHOP_2002: Convective-scale measurements at the profiling site', Monthly Weather Review, vol. 134, no. 1, pp. 294-310. https://doi.org/10.1175/MWR3054.1

The dryline on 22 May 2002 during IHOP_2002 : Convective-scale measurements at the profiling site. / Demoz, Belay B.; Flamant, Cyrille; Weckwerth, Tammy M.; Whiteman, David; Evans, Keith; Fabry, Frédéric; Di Girolamo, Paolo; Miller, David Owen; Geerts, Bart; Brown, William; Schwemmer, Geary; Gentry, Bruce; Feltz, Wayne; Wang, Zhien.

In: Monthly Weather Review, Vol. 134, No. 1, 01.01.2006, p. 294-310.

Research output: Contribution to journalArticle

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T2 - Convective-scale measurements at the profiling site

AU - Demoz, Belay B.

AU - Flamant, Cyrille

AU - Weckwerth, Tammy M.

AU - Whiteman, David

AU - Evans, Keith

AU - Fabry, Frédéric

AU - Di Girolamo, Paolo

AU - Miller, David Owen

AU - Geerts, Bart

AU - Brown, William

AU - Schwemmer, Geary

AU - Gentry, Bruce

AU - Feltz, Wayne

AU - Wang, Zhien

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N2 - A detailed analysis of the structure of a double dryline observed over the Oklahoma panhandle during the first International H2O Project (IHOP_2002) convective initiation (CI) mission on 22 May 2002 is presented. A unique and unprecedented set of high temporal and spatial resolution measurements of water vapor mixing ratio, wind, and boundary layer structure parameters were acquired using the National Aeronautics and Space Administration (NASA) scanning Raman lidar (SRL), the Goddard Lidar Observatory for Winds (GLOW), and the Holographic Airborne Rotating Lidar Instrument Experiment (HARLIE), respectively. These measurements are combined with the vertical velocity measurements derived from the National Center for Atmospheric Research (NCAR) Multiple Antenna Profiler Radar (MAPR) and radar structure function from the high-resolution University of Massachusetts frequency-modulated continuous-wave (FMCW) radar to reveal the evolution and structure of the late afternoon double-dryline boundary layer. The eastern dryline advanced and then retreated over the Homestead profiling site in the Oklahoma panhandle, providing conditions ripe for a detailed observation of the small-scale variability within the boundary layer and the dryline. In situ aircraft data, dropsonde and radiosonde data, along with NCAR S-band dual-polarization Doppler radar (S-Pol) measurements, are also used to provide the larger-scale picture of the double-dryline environment. Moisture and temperature jumps of about 3 g kg-1 and 1-2 K, respectively, were observed across the eastern radar fine line (dryline), more than the moisture jumps (1-2 g kg-1) observed across the western radar fine line (secondary dryline). Most updraft plumes observed were located on the moist side of the eastern dryline with vertical velocities exceeding 3 m s-1 and variable horizontal widths of 2-5 km, although some were as wide as 7-8 km. These updrafts were up to 1.5 g kg-1 moister than the surrounding environment. Although models suggested deep convection over the Oklahoma panhandle and several cloud lines were observed near the dryline, the dryline itself did not initiate any storms over the intensive observation region (IOR). Possible reasons for this lack of convection are discussed. Strong capping inversion and moisture detrainment between the lifting condensation level and the level of free convection related to an overriding drier air, together with the relatively small near-surface moisture values (less than 10 g kg-1), were detrimental to CI in this case.

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Demoz BB, Flamant C, Weckwerth TM, Whiteman D, Evans K, Fabry F et al. The dryline on 22 May 2002 during IHOP_2002: Convective-scale measurements at the profiling site. Monthly Weather Review. 2006 Jan 1;134(1):294-310. https://doi.org/10.1175/MWR3054.1