Observations of ClearAir Boundaries

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Presentation transcript:

Observations of ClearAir Boundaries Made By the UMass “Tornado Radar” During the International H2O Project (IHOP) Scientific Goals Christopher Weiss & Howard Bluestein University of Oklahoma Norman, Oklahoma

Operations During IHOP_2002 June 9 (dryline) June 10 (dryline) June 3 (cold front) Deployments: 3 rolling RHI 2 stationary RHI 2 VAD Deployments: 2 rolling RHI 2 VAD Deployments: 1 stationary RHI May 22 (dryline) Deployments: 4 rolling RHI 2 stationary RHI 2 VAD 1 vertical antenna X-sect

Scientific Goals Goal with UMass mm-wave data: Resolve the kinematics of the dryline secondary circulation (DSC) and dryline convergence zone (DCZ) Each mode of data collection has a different objective

Data Collection Strategies Mode #1 - VAD 5/22/02 – moist side VAD W Obtain high spatial resolution depiction of boundary layer wind profile on both sides of the dryline (e.g., inflection points?)

Data Collection Strategies Mode #2 – Vertical Antenna Spatial distribution of upward and downward motion in and near the DCZ Convective rolls

Data Collection Strategies Mode #3 – Stationary RHI DZ E VE Temporal evolution of the dryline. Support/refute theories of advancement, retrogression.

Data Collection Strategies Mode #4 – Rolling RHI Once suitable analysis method found, can resolve full two-dimensional wind field (u/w) in cross-dryline plane. Potentially the most useful data collection method

Complications Subtraction of truck velocity is delicate. Accurate GPS position, velocity important Pitch of truck Uncertainty of GPS elevation data Translation and development of feature “Stationarity assumption” Sensitivity and range Irregular weave pattern (i.e., varying angle of intersection between two radar looks)

Atkins et al. 1998 Weiss and Bluestein 2002 Compare high-resolution ground based data to recent airborne pseudo dual-Doppler studies. Descent west of DCZ? Acceleration of westerly inflow? Magnitude of descent east of DCZ? Contribution of air parcels in DCZ (e.g., trajectory analysis) Tilt of DCZ

6/10/02 1959 UTC DZ W VE (uncorrected)

Scientific Goals Goal with UMass mm-wave data: Resolve the kinematics of the dryline secondary circulation (DSC) and dryline convergence zone (DCZ) But…need collaboration for the full picture! Surface thermodynamic data [MM – (Rasmussen)] cm-wave radar [DOW/XPOW – (Richardson, Wurman), SR-1 (Ziegler, Markowski)] Airborne radar [ELDORA, Wyoming - Geerts, others?]