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Table of Contents - The Atmospheric Studies Group at TRC

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Section 10: POSTPROCESSORS<br />

IMPROVE form<strong>at</strong>. Example records for this file are listed in <strong>Table</strong> 10-18. When background extinction<br />

method number 5 is selected in the control file (MVISBK = 5), nephelometer measurements must be<br />

provided in the IMPROVE form<strong>at</strong>. Example records for this file are listed in <strong>Table</strong> 10-19.<br />

CALPOST uses the content <strong>of</strong> one field in the file header record to identify which type <strong>of</strong> file is provided<br />

(it must be consistent with the MVISBK selection). <strong>The</strong> first 26 characters are read, and the characters in<br />

position 24-26 must be "INS" for the nephelometer d<strong>at</strong>a file. Subsequent d<strong>at</strong>a records are read using the<br />

following st<strong>at</strong>ements, where the variable "meas" is the extinction coefficient (Mm -1 ):<br />

Transmissometer D<strong>at</strong>a:<br />

read(in5,102) iyr,ijday,ihr,meas,ivflag,irh<br />

102 form<strong>at</strong>(7x,i2,5x,i3,1x,i2,2x,i5,22x,i2,17x,i2)<br />

Nephelometer D<strong>at</strong>a :<br />

read(in5,101) iyr,ijday,ihr,meas,ivflag,rh<br />

101 form<strong>at</strong>(7x,i2,5x,i3,1x,i2,8x,i6,8x,i2,40x,40x,40x,11x,f7.2)<br />

If similar measurements are available from other sources, they may be used in CALPOST by adhering to<br />

this file structure. Note th<strong>at</strong> the transmissometer measurements are assumed to provide the total<br />

extinction coefficient, whereas the nephelometer measurements provide just the extinction coefficient due<br />

to particle sc<strong>at</strong>tering.<br />

10-47

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