Variations in drop-size distributions as measured with a continuous raindrop recorder and compared to radar echo characteristics Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/pv63g3659

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  • This study examines in detail a continuous drop-size distribution recorder and selected data gathered with this recorder at various locations on 6, 15, and 31 May 1966. The drop-size distribution recorder consists of a self-contained, mobile unit able to operate without electric power. This recorder utilizes "Ozalid 105 SZ" filter paper cut in rolls three inches wide and 150 feet long. Before using the ASB recorder, problems concerning smearing, underdevelopment, and splashing required a solution. A portion of the data used in this study came from the AN/TPS-10D weather radar located atop McCulloch Peak. Several comparisons between the radar data and the drop-size data demonstrate a tendency for a relationship between the average mean drop diameter and the average height of the echo top, averaging both values throughout a shower. A tendency for a relationship also occurs between the variance of the drop diameter and the average height of the echo top. The average mean echo intensity exhibits a possible correlation with both the mean of the parameter (D[subscript max]-D[subscript min])(D₁₀₀₀ + D₅₀₀ + D₁₀₀ + D₅₀ + D₁₀ + D₅) and the mean range of drop sizes. Student's t-test demonstrates a significant difference between the average mean drop diameter and the average range of the drop diameters gathered at different locations under the same synoptic conditions; however, it shows no significant difference at the same location even under different synoptic conditions. The difficulty of calculating the length of time required for a raindrop to fall from that region viewed by the radar to the ground makes a minute-to-minute comparison of drop-size data to radar data nearly impossible.
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