University of Illinois OAP Processing Software

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Presentation transcript:

University of Illinois OAP Processing Software

UIOPS Workflow Decompress Binary Image Process Individual Particles Timing and image data for each frame/record Process Individual Particles Different variations of Dmax Shape, area, habit Analyze Inter-arrival Times For particles sampled by 2DS Reacceptance of some particles Generate Size Distributions Concentration, mass, area f(Dmax) 1-s derived bulk quantities

UIOPS Processing Details Option to compute Dmax following a circular, rectangular, and elliptical fit around particle Latter 2 use Computational Geometry Algorithms Library Wu and McFarquhar (2016) Time-dependent inter-arrival time (𝜏) threshold determined from minimum frequency in bimodal distribution fit (e.g., Field et al. 2003) Particles w/ potential diffraction fringes marked as shattered reaccepted if 𝜏 < 10-6 s and D > 500 μm 1-s output of number concentration, mass, area, aspect ratio, and area ratio distributions as a function of particle size 1-s output of derived number concentration, effective radius, extinction, mass-weighted fall speed, precipitation rate, mean area ratio, and mean perimeter

Determining Inter-arrival Time Threshold Manual thresholding when 𝜏 doesn’t fit bimodal distribution Particles reaccepted if 𝜏 < 10-6 s & D > 500 μm

December 5 Processing Comparison

December 5 Time Series Comparison Courtesy Aaron Bansemer & Andrew Heymsfield Differences in how particles below inter-arrival time threshold are reaccepted

December 5 Time Series Comparison

Size Distribution Comparison

References Field, P. R., R. Wood, P. R. A. Brown, P. H. Kaye, E. Hirst, R. Greenaway, and J. A. Smith, 2003: Ice Particle Interarrival Times Measured with a Fast FSSP. J. Atmos. Ocean. Technol., 20, 249–261, doi:10.1175/1520- 0426(2003)020<0249:IPITMW>2.0.CO;2.

OLYMPEX Processing Progress Date Decompress Binary Image Particle-by-Particle (PBP) Data Inter-arrival Analysis Size Distributions Nov 12 ✔️ Nov 13 Nov 14 Nov 18 Nov 23 (I) Nov 23 (II) Nov 24 (I) Nov 24 (II) Dec 01 Dec 03

OLYMPEX Processing Progress (cont.) Date Decompress Binary Image Particle-by-Particle (PBP) Data Inter-arrival Analysis Size Distributions Dec 04 (I) ✔️ Dec 04 (II) Dec 05 Dec 10 Dec 12 Dec 13 (I) Dec 13 (II) Dec 18 (I) Dec 18 (II) Dec 19