Ice Particle Interarrival Times Measured with a Fast FSSP
Ice particle interarrival times have been measured with a fast forward scattering spectrometer probe (FSSP). The distribution of interarrival times is bimodal instead of the exponential distribution expected for a Poisson process. The interarrival time modes are located at ~10-2 and ~10-4 s. This eq...
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| Veröffentlicht in: | Journal of atmospheric and oceanic technology 2003-02, Vol.20 (2), p.249-261 |
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| creator | Field, P R Wood, R Brown, P R A Kaye, P H |
| description | Ice particle interarrival times have been measured with a fast forward scattering spectrometer probe (FSSP). The distribution of interarrival times is bimodal instead of the exponential distribution expected for a Poisson process. The interarrival time modes are located at ~10-2 and ~10-4 s. This equates to horizontal spacings on both the centimeter and meter scales. The characteristics of the interarrival times are well modeled by a Markov chain process that couples together two independent Poisson processes operating at different scales. The possibility that ice crystals shattering on the probe tip causes the bimodal interarrival times is explored and cannot be ruled out. If the observations are indicating real spacings of particles in clouds, then the observations show very localized (centimeter scale) concentrations of ~100 s cm-3 embedded within an average concentration of typically ~1 cm-3. If the localized high concentrations are produced by the ice crystals shattering, then the concentration measured by the FSSP is overcounted by a factor of 5 in the worst case measured here, but more typically by a factor of 2. This uncertainty in concentration will adversely affect the predicted radiative influence of these clouds. |
| doi_str_mv | 10.1175/1520-0426(2003)020<0249:IPITMW>2.0.CO;2 |
| format | Article |
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The distribution of interarrival times is bimodal instead of the exponential distribution expected for a Poisson process. The interarrival time modes are located at ~10-2 and ~10-4 s. This equates to horizontal spacings on both the centimeter and meter scales. The characteristics of the interarrival times are well modeled by a Markov chain process that couples together two independent Poisson processes operating at different scales. The possibility that ice crystals shattering on the probe tip causes the bimodal interarrival times is explored and cannot be ruled out. If the observations are indicating real spacings of particles in clouds, then the observations show very localized (centimeter scale) concentrations of ~100 s cm-3 embedded within an average concentration of typically ~1 cm-3. If the localized high concentrations are produced by the ice crystals shattering, then the concentration measured by the FSSP is overcounted by a factor of 5 in the worst case measured here, but more typically by a factor of 2. This uncertainty in concentration will adversely affect the predicted radiative influence of these clouds.</description><identifier>ISSN: 0739-0572</identifier><identifier>EISSN: 1520-0426</identifier><identifier>DOI: 10.1175/1520-0426(2003)020<0249:IPITMW>2.0.CO;2</identifier><language>eng</language><publisher>Boston: American Meteorological Society</publisher><subject>Clouds ; Crystals ; Ice ; Markov chains ; Meteorology</subject><ispartof>Journal of atmospheric and oceanic technology, 2003-02, Vol.20 (2), p.249-261</ispartof><rights>Copyright American Meteorological Society Feb 2003</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c372t-ca1a4b3b1de9a30444d49dd74e6d6a2984a4d8e95da096ff81935932ec0e93413</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,3668,27901,27902</link.rule.ids></links><search><creatorcontrib>Field, P R</creatorcontrib><creatorcontrib>Wood, R</creatorcontrib><creatorcontrib>Brown, P R A</creatorcontrib><creatorcontrib>Kaye, P H</creatorcontrib><title>Ice Particle Interarrival Times Measured with a Fast FSSP</title><title>Journal of atmospheric and oceanic technology</title><description>Ice particle interarrival times have been measured with a fast forward scattering spectrometer probe (FSSP). The distribution of interarrival times is bimodal instead of the exponential distribution expected for a Poisson process. The interarrival time modes are located at ~10-2 and ~10-4 s. This equates to horizontal spacings on both the centimeter and meter scales. The characteristics of the interarrival times are well modeled by a Markov chain process that couples together two independent Poisson processes operating at different scales. The possibility that ice crystals shattering on the probe tip causes the bimodal interarrival times is explored and cannot be ruled out. If the observations are indicating real spacings of particles in clouds, then the observations show very localized (centimeter scale) concentrations of ~100 s cm-3 embedded within an average concentration of typically ~1 cm-3. If the localized high concentrations are produced by the ice crystals shattering, then the concentration measured by the FSSP is overcounted by a factor of 5 in the worst case measured here, but more typically by a factor of 2. This uncertainty in concentration will adversely affect the predicted radiative influence of these clouds.</description><subject>Clouds</subject><subject>Crystals</subject><subject>Ice</subject><subject>Markov chains</subject><subject>Meteorology</subject><issn>0739-0572</issn><issn>1520-0426</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2003</creationdate><recordtype>article</recordtype><sourceid>8G5</sourceid><sourceid>BENPR</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><recordid>eNp9kU1Lw0AQQBdRsFb_Q_DgxyHt7Owmm1URJNgaaGmhFY_LNrvBlLTV3UTx35tQ8eDB0zDwGJj3CBlSGFAqoiGNEELgGF8hALsGhDtALm-yebacvtzjAAbp7BYPSO-XPCQ9EEyGEAk8JiferwGAMhr3iMxyG8y1q8u8skG2ra3TzpUfugqW5cb6YGq1b5w1wWdZvwY6GGlfB6PFYn5KjgpdeXv2M_vkefS4TJ_CyWycpQ-TMGcC6zDXVPMVW1FjpWbAOTdcGiO4jU2sUSZcc5NYGRkNMi6KhEoWSYY2BysZp6xPLvd339zuvbG-VpvS57aq9NbuGq8EZ5TzhPGWvPiXRMpEzJlowfM_4HrXuG37hULE1ppgcQuN91Dudt47W6g3V260-1IUVFdCdX5V51d1JRR0W1tC7UsoVKDSmUL2DZP6fIQ</recordid><startdate>20030201</startdate><enddate>20030201</enddate><creator>Field, P R</creator><creator>Wood, R</creator><creator>Brown, P R A</creator><creator>Kaye, P H</creator><general>American Meteorological Society</general><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7TG</scope><scope>7TN</scope><scope>7UA</scope><scope>7XB</scope><scope>88F</scope><scope>88I</scope><scope>8AF</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>8FK</scope><scope>8G5</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>ATCPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>F1W</scope><scope>GNUQQ</scope><scope>GUQSH</scope><scope>H8D</scope><scope>H96</scope><scope>HCIFZ</scope><scope>KL.</scope><scope>L.G</scope><scope>L7M</scope><scope>M1Q</scope><scope>M2O</scope><scope>M2P</scope><scope>MBDVC</scope><scope>P5Z</scope><scope>P62</scope><scope>PATMY</scope><scope>PCBAR</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PYCSY</scope><scope>Q9U</scope><scope>S0X</scope><scope>H95</scope></search><sort><creationdate>20030201</creationdate><title>Ice Particle Interarrival Times Measured with a Fast FSSP</title><author>Field, P R ; 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The distribution of interarrival times is bimodal instead of the exponential distribution expected for a Poisson process. The interarrival time modes are located at ~10-2 and ~10-4 s. This equates to horizontal spacings on both the centimeter and meter scales. The characteristics of the interarrival times are well modeled by a Markov chain process that couples together two independent Poisson processes operating at different scales. The possibility that ice crystals shattering on the probe tip causes the bimodal interarrival times is explored and cannot be ruled out. If the observations are indicating real spacings of particles in clouds, then the observations show very localized (centimeter scale) concentrations of ~100 s cm-3 embedded within an average concentration of typically ~1 cm-3. If the localized high concentrations are produced by the ice crystals shattering, then the concentration measured by the FSSP is overcounted by a factor of 5 in the worst case measured here, but more typically by a factor of 2. This uncertainty in concentration will adversely affect the predicted radiative influence of these clouds.</abstract><cop>Boston</cop><pub>American Meteorological Society</pub><doi>10.1175/1520-0426(2003)020<0249:IPITMW>2.0.CO;2</doi><tpages>13</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Clouds Crystals Ice Markov chains Meteorology |
| title | Ice Particle Interarrival Times Measured with a Fast FSSP |
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