BEGIN:VCALENDAR PRODID:-//Microsoft Corporation//Outlook 16.0 MIMEDIR//EN VERSION:2.0 METHOD:REQUEST X-MS-OLK-FORCEINSPECTOROPEN:TRUE BEGIN:VTIMEZONE TZID:Pacific Standard Time BEGIN:STANDARD DTSTART:16011104T020000 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11 TZOFFSETFROM:-0700 TZOFFSETTO:-0800 END:STANDARD BEGIN:DAYLIGHT DTSTART:16010311T020000 RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3 TZOFFSETFROM:-0800 TZOFFSETTO:-0700 END:DAYLIGHT END:VTIMEZONE BEGIN:VEVENT ATTENDEE;CN="ARB (RD) ALL OF RESEARCH DIVISION";RSVP=TRUE:mailto:310@arb.ca .gov ATTENDEE;CN="Avise, Jeremy@ARB";RSVP=TRUE:mailto:jeremy.avise@arb.ca.gov ATTENDEE;CN="Kaduwela, Ajith@ARB";RSVP=TRUE:mailto:ajith.kaduwela@arb.ca.go v ATTENDEE;CN="Chen, Jianjun@ARB";RSVP=TRUE:mailto:James.Chen@arb.ca.gov ATTENDEE;CN="Kwok, Roger@ARB";RSVP=TRUE:mailto:Roger.Kwok@arb.ca.gov ATTENDEE;CN="Ramirez, Leonardo@ARB";RSVP=TRUE:mailto:leo.ramirez@arb.ca.gov ATTENDEE;CN="DaMassa, John@ARB";RSVP=TRUE:mailto:john.damassa@arb.ca.gov ATTENDEE;CN="Benjamin, Michael@ARB";RSVP=TRUE:mailto:michael.benjamin@arb.c a.gov ATTENDEE;CN="Misra, Chandan@ARB";RSVP=TRUE:mailto:chandan.misra@arb.ca.gov ATTENDEE;CN="Hughes, Vernon@ARB";RSVP=TRUE:mailto:vernon.hughes@arb.ca.gov ATTENDEE;CN="McDougall, Mac@ARB";RSVP=TRUE:mailto:eric.mcdougall@arb.ca.gov ATTENDEE;CN="Scheller, Scott@ARB";RSVP=TRUE:mailto:scott.scheller@arb.ca.go v ATTENDEE;CN="Gill, Kathy@ARB";RSVP=TRUE:mailto:kathleen.gill@arb.ca.gov ATTENDEE;CN="Salardino, David@ARB";RSVP=TRUE:mailto:david.salardino@arb.ca. gov ATTENDEE;CN="Guerrero, Joe@ARB";RSVP=TRUE:mailto:joe.guerrero@arb.ca.gov ATTENDEE;CN="Stroud, Kenneth@ARB";RSVP=TRUE:mailto:kenneth.stroud@arb.ca.go v ATTENDEE;CN="Coombs, Mary Jane@ARB";RSVP=TRUE:mailto:maryjane.coombs@arb.ca .gov ATTENDEE;CN="Vanderspek, Sylvia@ARB";RSVP=TRUE:mailto:Sylvia.Vanderspek@arb .ca.gov ATTENDEE;CN="Tasat, Webster@ARB";RSVP=TRUE:mailto:webster.tasat@arb.ca.gov ATTENDEE;CN="Livingston, Shelby@ARB";RSVP=TRUE:mailto:shelby.livingston@arb .ca.gov ATTENDEE;CN="Moreno, Adam@ARB";RSVP=TRUE:mailto:adam.moreno@arb.ca.gov ATTENDEE;CN="Olson, Thomas@ARB";RSVP=TRUE:mailto:Thomas.Olson@arb.ca.gov ATTENDEE;CN="Caldwell, Kathryn@ARB";ROLE=OPT-PARTICIPANT;RSVP=TRUE:mailto:K athryn.Caldwell@arb.ca.gov ATTENDEE;CN="Zhou, Xiaochi (Joe)@ARB";ROLE=OPT-PARTICIPANT;RSVP=TRUE:mailto :xiaochi.zhou@arb.ca.gov ATTENDEE;CN="Carr, Laura@ARB";ROLE=OPT-PARTICIPANT;RSVP=TRUE:mailto:Laura.C arr@arb.ca.gov ATTENDEE;CN="Cui, Yuyan@ARB";ROLE=OPT-PARTICIPANT;RSVP=TRUE:mailto:Yuyan.Cu i@arb.ca.gov ATTENDEE;CN="Austin, Jeff@ARB";ROLE=OPT-PARTICIPANT;RSVP=TRUE:mailto:Jeff.A ustin@arb.ca.gov ATTENDEE;CN="Liu, Shang@ARB";ROLE=OPT-PARTICIPANT;RSVP=TRUE:mailto:shang.li u@arb.ca.gov ATTENDEE;CN="Gong, Longwen@ARB";ROLE=OPT-PARTICIPANT;RSVP=TRUE:mailto:Longw en.Gong@arb.ca.gov ATTENDEE;CN="Park, Hye-Youn@ARB";ROLE=OPT-PARTICIPANT;RSVP=TRUE:mailto:Hye- Youn.Park@arb.ca.gov CLASS:PUBLIC CREATED:20190418T172226Z DESCRIPTION:Please join us for the CARB Research Seminar:\n\nParticulate Ni trate Modeling in the San Joaquin Valley: Michael Kleeman\, Ph.D.\, Profes sor of Civil and Environmental Engineering \, University of California\, D avis\n\nAnnouncement: https://ww3.arb.ca.gov/research/seminars/kleeman4/kl eeman.htm\n\n \n\nOverview\n\nParticulate nitrate accounts for a significa nt fraction of the maximum 24-hr average PM2.5 mass concentrations in Cali fornia's San Joaquin Valley (SJV). Two decades ago regional chemical trans port models (CTMs) were able to predict maximum 24-hr average PM2.5 nitrat e concentrations with reasonable accuracy. More recently\, predicting maxi mum PM2.5 nitrate concentrations during contemporary air pollution episode s became more challenging\, especially with lower ambient NOx levels. This project evaluated emission inventories\, meteorological conditions\, and regional chemical regimes to determine pathways to improving nitrate predi ctions in the SJV. \n\n \n\nPredicted concentrations of total reactive nit rogen were consistently under-predicted in January of the years 2010\, 201 3\, and 2015 in the SJV. Under-predictions for total reactive nitrogen bec ame progressively more severe with years past 2010 suggesting a need to fu rther evaluate our understanding of various NOx emission sources. These tr ends are consistent with continued reductions in mobile source NOx emissio ns combined with some unknown source of NOx emissions that is not currentl y represented in the emissions inventory. \n\n \n\nThe inclusion of additi onal NOx emissions in the SJV partially addressed the gap in reactive nitr ogen emissions in central California. The case study with additional NOx e missions strongly increase predicted levels of total reactive nitrogen in rural areas and contribute approximately 20% to concentrations of total re active nitrogen in urban locations of Fresno and Bakersfield. The conversi on efficiency of NOx (from sources such as agricultural cropland) to parti culate nitrate is higher than the conversion efficiency of urban NOx emiss ions to particulate nitrate due to the diffuse nature of the these NOx emi ssions which yields more favorable mixing ratios with background ozone. Th e additional NOx emissions that were evaluated improved the accuracy of pr edictions for wintertime particulate nitrate at ground level\, wintertime particulate nitrate vertical profiles\, summertime ozone concentrations at ground level\, and NOx concentrations during both summer and winter. \n\n \n\nThe tests conducted in the current study suggest that updating NOx em issions in the SJV could improve the performance of CTMs. Future measureme nts should be made in the rural portions of the SJV to further test the hy pothesis that additional area-wide NOx emissions are a significant factor in the air quality cycles within the region \n\n \n\n \n\nSpeaker Biograph y\n\nMichael Kleeman is a Professor of Civil and Environmental Engineering at the University of California at Davis. His research is focused on meas urements and modeling of urban and regional air pollution problems. Dr. Kl eeman has published over 130 peer-reviewed research articles on topics ran ging from ozone production from agricultural sources to interactions betwe en climate-energy-air quality to characterization & source apportionment o f atmospheric ultrafine particles.\n\n \n\n \n\nFor information on this se minar\, please contact:\n\nWilliam Vance at (916) 323-1507 or send email t o: William.Vance@arb.ca.gov \n\n \n\nF or information on this Series\, please contact:\n\nReid Brown at (916) 323 -1522 or send email to: Reid.Brown@arb.ca.gov \n\n \n\nFor a complete listing of the ARB Research Seminars and the r elated documentation for the seminars please view the Main Seminars web pa ge: https://ww3.arb.ca.gov/research/seminars/seminars.htm\n\n \n\n \n\n DTEND;TZID="Pacific Standard Time":20190430T170000 DTSTAMP:20190416T225600Z DTSTART;TZID="Pacific Standard Time":20190430T150000 LAST-MODIFIED:20190418T172226Z LOCATION:Tuesday\, April 30\, 2019\, 3:00pm Sierra Hearing Room\, Second Fl oor\, Cal EPA Headquarters\, 1001 "I" Street\, Sacramento\, CA ORGANIZER;CN="Brown, Reid@ARB":mailto:reid.brown@arb.ca.gov PRIORITY:5 SEQUENCE:0 SUMMARY;LANGUAGE=en-us:Research seminar on Particulate Nitrate Modeling in the San Joaquin Valley TRANSP:OPAQUE UID:040000008200E00074C5B7101A82E00800000000501E812A6BF4D401000000000000000 010000000BF8B18691B6E604181B0E52D233E565E X-ALT-DESC;FMTTYPE=text/html:

Please join us for the CARB Research Seminar:

Particulate Nitrate Modeling in the San Joaqui n Valley: Michael Kleeman\, Ph.D.\, Professor of Civil and Environmental E ngineering \, University of California\, Davis

Announcement: https://ww3.arb.ca.gov/research/seminars/kleem an4/kleeman.htm

 \;

Overview

Particulate nitrate accounts for a significant fraction of th e maximum 24-hr average PM2.5 mass concentrations in California's San Joaq uin Valley (SJV). Two decades ago regional chemical transport models (CTMs ) were able to predict maximum 24-hr average PM2.5 nitrate concentrations with reasonable accuracy. More recently\, predicting maximum PM2.5 nitrate concentrations during contemporary air pollution episodes became more cha llenging\, especially with lower ambient NOx levels. This project evaluate d emission inventories\, meteorological conditions\, and regional chemical regimes to determine pathways to improving nitrate predictions in the SJV .

 

Predicted concentrations of total reactive nitrogen were consistently under-predicted in January of the years 2010\, 2013\, and 2015 in the SJV. Under-predictions for total reactive nitrogen became progressively more s evere with years past 2010 suggesting a need to further evaluate our under standing of various NOx emission sources. These trends are consistent with continued reductions in mobile source NOx emissions combined with some un known source of NOx emissions that is not currently represented in the emi ssions inventory.

 

The inclusion of additional NOx emissions in the SJV p artially addressed the gap in reactive nitrogen emissions in central Calif ornia. The case study with additional NOx emissions strongly increase pred icted levels of total reactive nitrogen in rural areas and contribute appr oximately 20% to concentrations of total reactive nitrogen in urban locati ons of Fresno and Bakersfield. The conversion efficiency of NOx (from sour ces such as agricultural cropland) to particulate nitrate is higher than t he conversion efficiency of urban NOx emissions to particulate nitrate due to the diffuse nature of the these NOx emissions which yields more favora ble mixing ratios with background ozone. The additional NOx emissions that were evaluated improved the accuracy of predictions for wintertime partic ulate nitrate at ground level\, wintertime particulate nitrate vertical pr ofiles\, summertime ozone concentrations at ground level\, and NOx concent rations during both summer and winter.

 

The tests conducted in the curren t study suggest that updating NOx emissions in the SJV could improve the p erformance of CTMs. Future measurements should be made in the rural portio ns of the SJV to further test the hypothesis that additional area-wide NOx emissions are a significant factor in the air quality cycles within the r egion

 

 \;

Speaker Biography

Michael Kleeman is a Professor of Civil and Environmental Engine ering at the University of California at Davis. His research is focused on measurements and modeling of urban and regional air pollution problems. D r. Kleeman has published over 130 peer-reviewed research articles on topic s ranging from ozone production from agricultural sources to interactions between climate-energy-air quality to characterization &\; source appor tionment of atmospheric ultrafine particles.

 \;

 \;

< p class=MsoPlainText>For information on this seminar\, please contact:

William Vance at (916) 323-1507 or send e mail to: William.Vance@arb.ca.go v 

 \;

For information on this Series\, please contact:

Reid Brown at (916) 323-1522 or send email to: < a href="mailto:Reid.Brown@arb.ca.gov">Reid.Brown@arb.ca.gov

 

For a co mplete listing of the ARB Research Seminars and the related documentation for the seminars please view the Main Seminars web page: https://ww3.arb.ca.gov/rese arch/seminars/seminars.htm

&n bsp\;

 \;

X-MICROSOFT-CDO-BUSYSTATUS:BUSY X-MICROSOFT-CDO-IMPORTANCE:1 X-MICROSOFT-DISALLOW-COUNTER:FALSE X-MS-OLK-APPTSEQTIME:20190416T225600Z X-MS-OLK-AUTOFILLLOCATION:FALSE X-MS-OLK-CONFTYPE:0 BEGIN:VALARM TRIGGER:-PT15M ACTION:DISPLAY DESCRIPTION:Reminder END:VALARM END:VEVENT END:VCALENDAR