{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/101185"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/101185","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Evaluation of triple-frequency radar retrieval of snowfall properties using coincident airborne in-situ observations during olympex","abstract":"Particle scattering models have shown that aggregates and spherical particles occupy distinct regions of the Ku-Ka-W-band Dual-Frequency Ratio (DFR) plane. Furthermore, ground-based observations suggest that particle bulk density and characteristic size can be retrieved from the DFR plane. This is the first study to evaluate the retrieval of particle shape, bulk density and characteristic size using airborne triple-frequency radar observations coincident with airborne in-situ microphysical measurements. Data from the Olympic Mountains Experiment (OLYMPEX) resulted in 2.2 hours of observations that showed the Ku-Ka-W DFR plane offered little unambiguous information about particle shape. Analysis of a case study on 3 December 2015 is consistent with a past modeling study, showing increased bulk density with increased DFR between the Ka- and W-band. Meanwhile, bulk statistics are consistent with a past observational study, showing the potential retrieval of effective density and characteristic size from the DFR Ku-Ka-W plane.","abstract_html":"Particle scattering models have shown that aggregates and spherical particles occupy distinct regions of the Ku-Ka-W-band Dual-Frequency Ratio (DFR) plane. Furthermore, ground-based observations suggest that particle bulk density and characteristic size can be retrieved from the DFR plane. This is the first study to evaluate the retrieval of particle shape, bulk density and characteristic size using airborne triple-frequency radar observations coincident with airborne in-situ microphysical measurements. Data from the Olympic Mountains Experiment (OLYMPEX) resulted in 2.2 hours of observations that showed the Ku-Ka-W DFR plane offered little unambiguous information about particle shape. Analysis of a case study on 3 December 2015 is consistent with a past modeling study, showing increased bulk density with increased DFR between the Ka- and W-band. Meanwhile, bulk statistics are consistent with a past observational study, showing the potential retrieval of effective density and characteristic size from the DFR Ku-Ka-W plane.","abstract_has_math":false,"creators":["Chase, Randy J."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Atmospheric Sciences","degree_department":null,"school":null,"contributors":["Nesbitt, Stephen W.","McFarquhar, Greg M."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2018,"date_issued":"2018-09-04T20:36:43Z","date_published":"2018-09-04T20:36:43Z","updated_at":"2026-07-22T22:24:38Z","subjects":["Precipitation Retrievals","Global Precipitation Measurement","Triple-Frequency Radar","Snow"],"languages":["en"],"rights":["© by Randy J. 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Analysis of a case study on 3 December 2015 is consistent with a past modeling study, showing increased bulk density with increased DFR between the Ka- and W-band. Meanwhile, bulk statistics are consistent with a past observational study, showing the potential retrieval of effective density and characteristic size from the DFR Ku-Ka-W plane.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2020-05-01","The student, Randy Chase, accepted the attached license on 2018-04-17 at 20:22.","The student, Randy Chase, submitted this Thesis for approval on 2018-04-17 at 20:30.","This Thesis was approved for publication on 2018-04-18 at 09:22.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12330 on 2018-08-31 at 17:20:23","Made available in DSpace on 2018-09-04T20:36:43Z (GMT). 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Furthermore, ground-based observations suggest that particle bulk density and characteristic size can be retrieved from the DFR plane. This is the first study to evaluate the retrieval of particle shape, bulk density and characteristic size using airborne triple-frequency radar observations coincident with airborne in-situ microphysical measurements. Data from the Olympic Mountains Experiment (OLYMPEX) resulted in 2.2 hours of observations that showed the Ku-Ka-W DFR plane offered little unambiguous information about particle shape. Analysis of a case study on 3 December 2015 is consistent with a past modeling study, showing increased bulk density with increased DFR between the Ka- and W-band. Meanwhile, bulk statistics are consistent with a past observational study, showing the potential retrieval of effective density and characteristic size from the DFR Ku-Ka-W plane.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2020-05-01","The student, Randy Chase, accepted the attached license on 2018-04-17 at 20:22.","The student, Randy Chase, submitted this Thesis for approval on 2018-04-17 at 20:30.","This Thesis was approved for publication on 2018-04-18 at 09:22.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12330 on 2018-08-31 at 17:20:23","Made available in DSpace on 2018-09-04T20:36:43Z (GMT). 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