APPROXIMATION OF THE SIZE DISTRIBUTION OF MARINE PARTICLES BY A SUM OF LOG-NORMAL FUNCTIONS

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Authors
  1. Jonasz, M.
  2. Fournier, G.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
A simple algorithm is presented that decomposes the size distribution of marine particles into a sum of log-normal components of the 0th order. The algorithm was applied to 412 particle-size distributions in a particle-diameter range of approximates to 0.5-200 mu m measured by different researchers in various water bodies. A size distribution from this population may have from 1 to 6 log-normal components. The variability of the number of components reflects the variability in the shape of the size distribution and variations in the size range in which the data are available. The full-width-at-half-maximum of a component is approximately proportional to the peak diameter of the component. The maximum value of a component is approximately proportional to the inverse of the square of the peak diameter. Two standard components of the marine particle-size distribution were identified. The peak diameter (Dpeak), width parameter (sigma), and maximum value (FDmax), of the first component are, respectively, 0.66 mu m, 0.673, and 1.34 x E4 mu m 1(-) square cubic. These parameters for the second component are 10.5 mu m, 0.366, and 3.3 mu m 1(-) square cubic.
Keywords
Log normal functions
Date of publication
07 Aug 1995
Number of Pages
11
Reprinted from
Limnol, Oceanogr, vol 41, no 4, 1996, p 744-754
DSTKIM No
96-03347
CANDIS No
499908
Format(s):
Hardcopy;Document Image stored on Optical Disk

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