Abstract : L.7
Quantification of coherent atmospheric structures using a beam steering method

Felicity Perry, Stephen Mobbs
Institute for Atmosperic Science

Atmospheric pressure signals contain a huge amount of information across a broad range of frequencies. Pressure signals are ideal for the quantification of the velocity, phase and direction of motion of a coherent atmosphere structure.

Coherent structures such as cold pools and gravity waves produce pressure peturbations which can be identified in pressure time-series. By using an array of three or more barometers, a pressure anomaly can be traked using the time shifts between the different sensors. Simply put this is beam-steering. Identification and extraction of the signal is by application of a wavelet analysis.

The University of Leeds Automatic Weather Station (AWS) system, as used in CSIP and T-REX is ideal for this purpose as the sensors are numerous enough to provide a wide spatial coverage. The pressure sensors are also sensitive enough to provide pressure to 0.1mb accuracy and are all synched to GPS time signals. This final point means that the time recorded in the file is not only very accurate, but is also highly comparable between stations. Temoporal accuracy is very important in the application of a beam-steering methodology.