Development of a NOx Chemistry Module for EDMS/AEDT to Predict NO2 Concentrations (2017) / Chapter Skim
Currently Skimming:
Pages 16-25
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 16... ...
co PV ov pl th pl ac ve gr vo th T ar ca po ov co Based up AERMOD the highes 4.0 Mod As a mea current predicting measured assessed a 4.1 Case‐ For this a three airpo These air three imp large com sufficient concentra airport em Furthermo developed layout an periods fo nservatively MRM ‐ Th erestimate th umes by ove e manner in ume volume count for the rtical disper ound for low lume of the e conversion he PVMRM ea sources us lculating the rtion of the erestimate th nversion of N on the outco software w t potential fo eled vs. Me ns of better EDMS/AEDT NO2 valu NO2 data at nd compared Study Airpo nalysis, mon rts were eva Los Angel Adelaide ( Montreal Internation ports were ortant criteri mercial serv enough t tions and rati ission sourc re, and in the and utilized d monitor lo r the study. high results.
|
From page 17... ...
17 Table 5. Air Monitoring Time Periods Airport Purpose Timeframe Time Period Resolution Adelaide International (ADL) Permanent station July 1, 2011 - May 31, 2012 1 Year Hourly Los Angeles International (LAX)
|
From page 18... ...
Sc ra gr R de an M ex m M co de Presented summariz 4.3.1 Q‐Q The Q-Q against ea ADL: As s concentra high conc atterplots (U tio concentra aph. HC - The RH termined fro d predicted v ean Squared amine the p onitored valu aximum Val mpare the termining if below in ed above: Plots plot is a gra ch other.
|
From page 19... ...
LAX AQSA concentra and at hig over-pred LAX AQSA NO2 conc concentra S – CE: At lo tions, the met h concentrati ict. S – CS: The m entrations thr tions levels. w NO2 monit hods tend to ons, the meth ethods tend oughout all m ored under-predic ods tend to to over-pred onitored 19 t, LAX AQ concent predict concent have a f high co predict. models ict LAX SPA the met concent SAS – CN: At rations, the m and then beg rations.
|
From page 20... ...
YUL: At lo they tend 4.3.2 Sca For this an time mon model con under-pre presented ADL: A la amount of and PVM 1:1 line, in w monitored to over-predi tter Plots (P alysis, mode itored ratios. version meth dictions occu and briefly d rge range of scatter is als RM w/ varia dicating that concentratio ct. aired in Tim led NO2/NO A 1:1 (x = od over- or r below.
|
From page 21... ...
LAX AQSA issues in m tightly clu (ARM2, O ARM2 is conservat monitored LAX AQSA 6.35 (note excluded indicates t and is less S‐ CE Season onitored da stered within LM, OLM w generally be ive than oth /low modele S ‐ CN Seaso : modeled va on this plot)
|
From page 22... ...
4.3.3 Sca Modeled plotted an they plot m ADL: At concentra concentra similar stu of the NO 4 RTP En Modeli http://w tter Plots (U and monitore d described b onitored da lower NOx tions best, an tions the best dies.4 At hig 2/NOx Ratio. vironmental Ass ng: Developmen ww.epa.gov/scr npaired in d NO2/NOx r elow.
|
From page 23... ...
LAX AQSA the monit to fit the m highest es LAX AQSA generally ARM2 m PVMRM LAX SPAS closely al method se w/ variabl S – CE: At lo ored concentr onitored co timate of the S – CN: At match the m ethod seems w/ variable is : At lower N igned with th ems to fit the e is the highe wer NOx co ations best, a ncentrations NO2/NOx Ra lower NOx onitored co to fit the mo the highest Ox concentra e monitored c monitored c st estimate o ncentrations, nd at mid-to best. At high tio. concentratio ncentrations nitored conc estimate of th tions, the PV oncentration oncentration f the NO2/NO 23 the results fr -higher NOx er NOx conc ns, the PVM best, and at entrations the e NO2/NOx R MRM w/ va s, and at mid s the best.
|
From page 24... ...
YUL: At l most clos ARM2 m PVMRM 4.3.4 RH As shown concentra ratios whe when com M Full C A OLM w PV PVMRM Monit 4.3.5 Me The mean MSE, the values for The result associated ower NOx co ely aligned w ethod seems w/variable pr C in Table 6 b tion when co n compared pared to the ethod onversion RM2 OLM /Variable MRM w/Variable ored (NO2) an Squared squared erro closer the m ADL is show s indicate tha with the AR ncentrations ith the moni to fit the mo oduces the h elow, the RH mpared to m to monitored monitored rat Table 6. RHC X(N)
|
From page 25... ...
25 methods. The PVMRM and OLM methods' MSE values are likely very sensitive to the input NO2/NOx emission ratios.
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.