Concurrent FM-CW Radar and Lidar Observations of the Boundary Layer

V. R. Noonkester Naval Electronics Laboratory Center, San Diego, Calif 92152

Search for other papers by V. R. Noonkester in
Current site
Google Scholar
PubMed
Close
,
D. R. Jensen Naval Electronics Laboratory Center, San Diego, Calif 92152

Search for other papers by D. R. Jensen in
Current site
Google Scholar
PubMed
Close
,
J. H. Richter Naval Electronics Laboratory Center, San Diego, Calif 92152

Search for other papers by J. H. Richter in
Current site
Google Scholar
PubMed
Close
,
W. Viezee Stanford Research Institute, Menlo Park, Calif. 94025

Search for other papers by W. Viezee in
Current site
Google Scholar
PubMed
Close
, and
R. T. H. Collis Stanford Research Institute, Menlo Park, Calif. 94025

Search for other papers by R. T. H. Collis in
Current site
Google Scholar
PubMed
Close
Restricted access

Abstract

Boundary layer probing by multiple remote sensors can greatly improve the understanding of processes in this complex region. For this purpose one needs to know the unique information each individual sensor can provide. Two promising boundary layer remote sensors, a microwave, frequency-modulated, continuous-wave (FM-CW) radar and a laser radar (lidar), were operated simultaneously to probe a common volume. As expected, the lidar sometimes separately detected aerosol layers, notably cloud bases, and the radar sometimes separately detected refractive layers and insects. Boundaries of aerosol structures were often found to be regions of radar returns such as in layers, convective activity, and breaking waves. In contrast, however, a refractive layer was observed within an apparently well-mixed aerosol layer. The data indicate that the radar may have a characteristic echo which is coincident with cloud and fog tops. This experiment shows that FM-CW radars and lidars can separately sense layering in the boundary region and that they provide complementary information on boundary layer mixing processes.

Abstract

Boundary layer probing by multiple remote sensors can greatly improve the understanding of processes in this complex region. For this purpose one needs to know the unique information each individual sensor can provide. Two promising boundary layer remote sensors, a microwave, frequency-modulated, continuous-wave (FM-CW) radar and a laser radar (lidar), were operated simultaneously to probe a common volume. As expected, the lidar sometimes separately detected aerosol layers, notably cloud bases, and the radar sometimes separately detected refractive layers and insects. Boundaries of aerosol structures were often found to be regions of radar returns such as in layers, convective activity, and breaking waves. In contrast, however, a refractive layer was observed within an apparently well-mixed aerosol layer. The data indicate that the radar may have a characteristic echo which is coincident with cloud and fog tops. This experiment shows that FM-CW radars and lidars can separately sense layering in the boundary region and that they provide complementary information on boundary layer mixing processes.

Save