CRC Report No. A-34 - Coordinating Research Council

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April 2005 Round 3 In Round 3, DRI was instructed to use the same profiles used in Round 1. The upwind background profile provided by ENVIRON in Round 2 was the only exception. The sets of fitting species that were applied to the simulated in Round 2 were also used in Round 3. Round 4 In Round 4, DRI was given the 22 aggregate “A-34” source composition profiles shown in Table 2-3 and Appendix A. DRI was also informed of the conceptual design of each experiment, the characteristics of the sampling noise algorithm and the average profiles for each receptor and experiment based on the 9 cell around each receptor. Prior to the final CMB runs for Round 4, DRI ran a series of tests to examine the sensitivity of model results on the four alternative gasoline exhaust profiles (A-34 category 1 to 4). The results, summarized in Table 3-5, show little variation among the profile, especially for the first three profiles. The final CMB runs consisted of categories 1, 5, 7, 11, 12, 13, 14, 17, 18, 21 and 22 for the default set of profiles except as noted below. The following notes also specify the default set of fitting species that were applied. Notes on autofit CMB – Round 4 Interior Sites (DBar and VNuys) 06-09 PDT • Used type2 fresh exhaust species set. • Removed ethane from default species list due to excess ethane in boundary conditions which accounted for almost all of under apportionment; improved stats. • Removed IndEngin (caused collinearity). • exp5 - used type2 aged exhaust species set. • exp6 - put ethane back into species list; high ethane from increased industrial emissions, especially at Vnuys. Interior Sites (DBar and VNuys) 10-05 PDT • Used type2 aged exhaust species set. • Removed IndEngin. • Removed ethane from default species list due to excess ethane in boundary conditions, which accounted for almost all of under apportionment; improved stats. • exp3 - removed SynthInd profile due to frequent collinearity. • exp6 - put ethane back into species list; high ethane from increased industrial emissions, especially at Vnuys. • exp8 - many samples did not fit due to collinearity. Tried removing some solvent-related sources, and 'other' without much success. Ran with default source set. • exp9-12 - removed ethene, acetylene, ethane and I-buta to improve fit. Coastal Sites (LAX and Long Beach) • Used type2 fresh exhaust species set. • Removed IndEngin (caused collinearity). • exp5 - used type2 aged exhaust species set. H:\crca34-receptor\report\Final\sec3.doc 3-6
April 2005 • Removed ethane from default species list due to excess ethane in boundary conditions, which accounted for almost all of under apportionment; improved stats. • exp6 - tried to improve fits by removing sources and species, without success. • exp9-12 - removed ethene, acetylene, ethane, I-buta to improve fit. Downwind sites (Lake Perris and Crestline) • Used type 3 site default species. • Removed IndEngin. • Removed Paint, Solvents, and Degrease from profile list because of too few selected species in profiles. • exp4 - used type2 aged exhaust species set (not enough species in type 3 set), and put Paint and Solvents profiles back in. • exp9-12 - removed acetylene, ethane to improve fit. Middle sites (Anaheim and Hawthorne) • Used type2 fresh exhaust species set. • Removed ethane from default species list due to excess ethane in boundary conditions, which accounted for almost all of under apportionment; improved stats. • Removed IndEngin (caused collinearity). • exp5 - used type2 aged exhaust species set. • exp6 - put ethane back into species list; high ethane from increased industrial emissions, especially at Van Nuys. Notes On Manual CMB - Round 4 • CMB run manually for Diamond Bar and Van Nuys for Experiments 1, 2, 3, 6 and 7 for hours 8,12,18 and 24 (80 samples at each site). • Source elimination feature turned on. Highest negative SCE is automatically removed and CMB rerun until no negative SCEs remain. • Used Type 2 fitting species for 08000 samples. Remove ethene in most cases. • Use same fitting species set for other times except ethane, n_prbz, iprbz and etbz were removed. • Species with absolute value of R/U ratio 1 greater than 2 were removed from fitting species and CMB repeated. Species with R/U occasionally greater than 2 include mcypna, pena2m, pena3m, i_buta, n_buta, hexa3m, mecyhx, and bu23dm. 1 Ratio of Residual to Its Standard Error (RATIO R/U). This column contains the ratio of the signed difference between the calculated and measured concentration (the residual) divided by the uncertainty of that residual (square root of the sum of the squares of the uncertainty in the calculated and measured concentrations). The RATIO R/U specifies the number of uncertainty intervals by which the calculated and measured concentrations differ. When the absolute value of the RATIO R/U exceeds 2, the residual is significant. If it is positive, then one or more of the profiles is contributing too much to that species. If it is negative, then there is an insufficient contribution to that species and a source may be missing. The sum of the squared RATIO R/U for fitting species divided by the degrees of freedom yields the CHI-SQUARE. The highest RATIO R/U values for fitting species are the cause of high CHI SQUARE values. H:\crca34-receptor\report\Final\sec3.doc 3-7
Page 1 and 2: International Corporation Air Scien
Page 3 and 4: April 2005 TABLE OF CONTENTS Page E
Page 5 and 6: April 2005 Table 4-1. Categories id
Page 7 and 8: April 2005 EXECUTIVE SUMMARY Recept
Page 9 and 10: April 2005 Comparing the performanc
Page 11 and 12: April 2005 90 12 Anaheim 80 10 Cr e
Page 13 and 14: April 2005 This assumption is a mat
Page 15 and 16: April 2005 dissimilar from the loca
Page 17 and 18: April 2005 1.0 INTRODUCTION 1.1 STU
Page 19 and 20: April 2005 1.4 OVERVIEW OF PROJECT
Page 21 and 22: April 2005 Meteorological input dat
Page 23 and 24: April 2005 A-34 Num Short Name Full
Page 25 and 26: April 2005 Sunday 3-Aug-97 Monday 4
Page 27 and 28: April 2005 ARB ROG TOG ARB Profile
Page 29 and 30: April 2005 Industrial facilities fr
Page 31 and 32: April 2005 Figure 2-2. Comparison o
Page 33 and 34: April 2005 2.4 EXPERIMENTS FOR ROUN
Page 35 and 36: April 2005 Table 2-9. Source catego
Page 37 and 38: April 2005 Table 2-13. Replacement
Page 39 and 40: April 2005 from front to back is th
Page 41 and 42: April 2005 3. Set the average diese
Page 43 and 44: April 2005 Table 2-15. Model year d
Page 45 and 46: April 2005 Table 2-17. Fuel composi
Page 47 and 48: April 2005 3.0 RECEPTOR MODELING ME
Page 49 and 50: April 2005 Selection of Fitting Spe
Page 51: April 2005 samples. Spatial variati
Page 55 and 56: April 2005 Table 3-2. Criteria for
Page 57 and 58: April 2005 Table 3-4 (continued). N
Page 59 and 60: April 2005 120 100 80 60 40 20 0 no
Page 61 and 62: April 2005 4.0 RESULTS This section
Page 63 and 64: April 2005 (c) Round 4: Experiment
Page 65 and 66: April 2005 emissions contributions,
Page 67 and 68: April 2005 reactivity and found CMB
Page 69 and 70: April 2005 (c) Round 4: Experiments
Page 71 and 72: April 2005 (a) 6:00am to 9:00am 80
Page 73 and 74: April 2005 (a) siteid Anaheim exp 1
Page 75 and 76: April 2005 influence CMB performanc
Page 77 and 78: April 2005 Round 3: Experiments 9-1
Page 79 and 80: April 2005 Comparison of Source Con
Page 81 and 82: April 2005 Table 4-2. Source catego
Page 83 and 84: April 2005 contributions being diff
Page 85 and 86: April 2005 to 2.4 over the A-34 sou
Page 87 and 88: April 2005 Experiment 1: Base Case
Page 89 and 90: April 2005 28. Spatial heterogeneit
Page 91 and 92: April 2005 composition derived from
Page 93 and 94: April 2005 species (CNG and LPG for
Page 95 and 96: April 2005 REFERENCES Allen, P. 200
Page 97 and 98: April 2005 Guenther, A., B. Baugh,
Page 99 and 100: APPENDIX A Supplemental Modeling Re
Page 101 and 102: SCC Description TOG %TOG Cumulative
Page 103 and 104:
SCC Description TOG %TOG Cumulative
Page 105 and 106:
ARB Profile Number TOG %Total % TOG
Page 107 and 108:
A-34 Number SCC Code SCC Descriptio
Page 109 and 110:
A-34 Number SCC Code SCC Descriptio
Page 111 and 112:
Table A-4 (continued). A-34 Source
Page 113 and 114:
Table A-5. Mean source profiles (PA
Page 115 and 116:
Table A-5 (concluded). A-34 Source
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APPENDIX B CMB-Derived Source Contr
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SCE (ppbC) SCE (ppbC) 18 16 14 12 1
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SCE (ppbC) 14 12 10 8 6 4 2 0 6 5 C
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SCE (ppbC) 12 10 8 6 4 2 0 6 5 Cons
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SCE (ppbC) 10 9 8 7 6 5 4 3 2 1 0 6
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SCE (ppbC) 6 5 4 3 2 1 0 Consumer P
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SCE (ppbC) SCE (ppbC) SCE (ppbC) 4
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SCE (ppbC) SCE (ppbC) 12 10 8 6 4 2
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SCE (ppbC) SCE (ppbC) SCE (ppbC) 10
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SCE (ppbC) 9 8 7 6 5 4 3 2 1 0 12 1
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SCE (ppbC) SCE (ppbC) SCE (ppbC) SC
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SCE (ppbC) 6 5 4 3 2 1 0 Consumer P
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SCE (ppbC) 160 140 120 100 80 60 40
Page 153:
Diamond Bar - Source Category 14 Di
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CRC Report No. A-34 - Coordinating Research Council

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