The spatial variability of parameters of the raindrop size distribution and its derivatives is investigated through a field study where collocated Particle Size and Velocity (Parsivel 2) and two-dimensional video disdrometers were operated at six sites at Wallops Flight Facility, Virginia, from December 2013 to March 2014. The three-parameter exponential function was employed to determine the spatial variability across the study domain where the maximum separation distance was 2.3 km. The nugget parameter of the exponential function was set to 0.99 and the correlation distance d(0) and shape parameter s(0) were retrieved by minimizing the root-mean-square error, after fitting it to the correlations of physical parameters. Fits were very good for almost all 15 physical parameters. The retrieved d(0) and s(0) were about 4.5 km and 1.1, respectively, for rain rate (RR) when all 12 disdrometers were reporting rainfall with a rain-rate threshold of 0.1mmh 21 for 1-min averages. The d(0) decreased noticeably when one or more disdrometers were required to report rain. The d(0) was considerably different for a number of parameters (e.g., mass-weighted diameter) but was about the same for the other parameters (e.g., RR) when rainfall threshold was reset to 12 and 18 dBZ for Ka- and Ku-band reflectivity, respectively, following the expected Global Precipitation Measurement mission's spaceborne radar minimum detectable signals. The reduction of the database through elimination of a site did not alter d(0) as long as the fit was adequate. The correlations of 5-min rain accumulations were lower when disdrometer observations were simulated for a rain gauge at different bucket sizes.
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Northeastern Univ, Minist Educ Safe Min Deep Met Mines, Key Lab, Shenyang 110819, Peoples R China
Northeastern Univ, Sch Resources & Civil Engn, Shenyang 110819, Peoples R China
GFZ German Res Ctr Geosci, D-14473 Potsdam, GermanyNortheastern Univ, Minist Educ Safe Min Deep Met Mines, Key Lab, Shenyang 110819, Peoples R China
Ren, Yaqun
Wohlgemuth-Ueberwasser, Cora C.
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GFZ German Res Ctr Geosci, D-14473 Potsdam, GermanyNortheastern Univ, Minist Educ Safe Min Deep Met Mines, Key Lab, Shenyang 110819, Peoples R China
Wohlgemuth-Ueberwasser, Cora C.
Huang, Fei
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Northeastern Univ, Minist Educ Safe Min Deep Met Mines, Key Lab, Shenyang 110819, Peoples R China
Northeastern Univ, Sch Resources & Civil Engn, Shenyang 110819, Peoples R ChinaNortheastern Univ, Minist Educ Safe Min Deep Met Mines, Key Lab, Shenyang 110819, Peoples R China
Huang, Fei
Shi, Xuefa
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Minist Nat Resources, Key Lab Marine Geol & Metallogeny, Qingdao 266061, Peoples R ChinaNortheastern Univ, Minist Educ Safe Min Deep Met Mines, Key Lab, Shenyang 110819, Peoples R China
Shi, Xuefa
Li, Bing
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Minist Nat Resources, Key Lab Marine Geol & Metallogeny, Qingdao 266061, Peoples R ChinaNortheastern Univ, Minist Educ Safe Min Deep Met Mines, Key Lab, Shenyang 110819, Peoples R China
Li, Bing
Oelze, Marcus
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GFZ German Res Ctr Geosci, D-14473 Potsdam, GermanyNortheastern Univ, Minist Educ Safe Min Deep Met Mines, Key Lab, Shenyang 110819, Peoples R China
Oelze, Marcus
Schreiber, Anja
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GFZ German Res Ctr Geosci, D-14473 Potsdam, GermanyNortheastern Univ, Minist Educ Safe Min Deep Met Mines, Key Lab, Shenyang 110819, Peoples R China
Schreiber, Anja
Wirth, Richard
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GFZ German Res Ctr Geosci, D-14473 Potsdam, GermanyNortheastern Univ, Minist Educ Safe Min Deep Met Mines, Key Lab, Shenyang 110819, Peoples R China