Smoke-Column Observations from Two Forest Fires Using Doppler Lidar and Doppler Radar

Evolution and structure of a cold front in an Alpine valley as revealed by a Doppler lidar

“…Hence, the data spacing normal to the beam is about 10 m at a distance of 1 km from the lidar site and 100 m at a distance of 10 km, respectively. For the derivation of the 'full' wind field, radial velocities are interpolated on to a Cartesian grid with a horizontal and vertical mesh size of 100 m. We use a similar procedure to that applied in previous studies (Wakimoto, 1982;Intrieri, et al, 1990;Banta, et al, 1992) to derive the along-valley wind component u and the vertical wind component w from the radial wind velocity u r . We assume that the flow is along the valley in the direction of the lidar beam with a cross-valley wind component v = 0.…”

Kinematic structure of a wildland fire plume observed by Doppler lidar

“…Banta et al [1992] also observed a similar structure, but with reversed velocities in the plume, indicating a rotation or vorticity forming within the plume.…”

“…The development of a weak convergence zone downwind of a wind-driven fire front was observed by Clements et al [2007] during the FireFlux experiment. Convergence zones were also observed on a larger scale by Banta et al [1992] during a forest fire. However, Banta et al [1992] observed a reversal in the velocities indicating that a circulation had developed within the plume rather than downwind.…”

“…Convergence zones were also observed on a larger scale by Banta et al [1992] during a forest fire. However, Banta et al [1992] observed a reversal in the velocities indicating that a circulation had developed within the plume rather than downwind.…”

Synergy Between Doppler Radar and Lidar for Atmospheric Boundary Layer Research

“…The plumes may contain lofted debri as the primary source of targets, although smoke and condensed water droplets may also be evident. Banta et al (1992) Figure 8 shows Doppler lidar measurements of plumes over Helsinki produced from forest fires in North West Russia. The correlation between the lidar backscatter data and the retrieved vertical velocities shows convective updrafts containing the particulate-laden air from the cleaner air contained in downdrafts.…”