CalNex-LA
This page is a repository of information and links for preparing and executing the field experiment at the Los Angeles CalNex Supersite (*) as part of the CalNex-2010 field campaign. The focus of the campaign is to study nightime chemistry (led by Jochen Stutz of UCLA) and formation of secondary organic aerosol (led by Joost de Gouw of NOAA and Jose-Luis Jimenez of CU-Boulder). Prospective investigators who are interested in participating in this study should contact these PIs.
(*) Not to be confused with the Southern CA EPA Supersite which is headed by Costas Sioutas and located elsewhere.
There is no specific call for proposals for CalNex-LA. NOAA investigators will be funded by internal NOAA funds, while university investigators need to find relevant funding. CARB and NOAA are funding a limited number of external investigators.
Contents
Logistical Information
Tentatively the site is planned to be located at the Los Angeles North Main St. site, which has been used for air quality monitoring in LA for a long time. It is just 2 miles N of downtown LA, in a building of the LA Division of Water and Power. This is a link to a map of the site in Google Maps
Planned Gas-Phase Instrumentation
Several additional instruments (not listed here per request of the PIs while funding is sorted out) from at least two prominent US groups have been proposed, and will be deployed here is sufficient funding is available to the PIs.
| Parameter | Technique | PI | References | Funding / Availabiliy |
|---|---|---|---|---|
| VOCs | GC-MS | J. de Gouw, NOAA | Kuster et al., 2004 | Confirmed |
| NO3, HONO, HCHO, others | DOAS | J. Stutz, UCLA | Wang et al., 2006 | Confirmed |
| Organic acids (formic, acetic, propionic...), HONO, HNCO (isocyanic acid). Also HCl & HNO3 pending inlet improvements. | CIMS | J. Roberts & J. de Gouw, NOAA | Veres et al., 2008 | Confirmed |
| Glyoxal | Cavity-enhanced absorption spectroscopy | S. Brown, NOAA | Washenfelder et al., 2008 | Confirmed |
| PANs | GC-ECD | J. Roberts, NOAA | Williams et al., 2000 & Roberts et al., 2002 | Confirmed |
| ClNO2, PANs | CIMS | H. Osthoff, U. Calgary | Confirmed | |
| SO2 | Research-quality monitor | CARB | Confirmed | |
| O3, NO, NOx, CO | Monitoring-quality instruments | CARB | LA Main Site | Confirmed (part of LA main site) |
| CO | Research-quality monitor | NOAA | Tentative | |
| gas phase and semivolatile organics | High-resolution PTR-TOF MS | R. Holzinger (U. Utrecht, Netherlands) | Not published yet | Pending |
| Water-Soluble OC in the gas-phase | PILS and mist chamber + online WSOC | R. Weber (Georgia Tech) | Hennigan et al., 2008 | Pending |
| H2O2, CH3OOH and potentially other more substituted peroxides | Chemical Ionization MS | T. Bertram (UCSD) | Kercher etal., 2009 | Tentative |
Planned Particle-Phase Instrumentation
| Parameter | Technique | PI | References | Funding / Availability |
|---|---|---|---|---|
| Aerosol chemical composition | High-resolution ToF-AMS (HR-ToF-AMS) | J.L. Jimenez, CU Boulder | DeCarlo et al., 2006 & Aiken et al., 2009 | Confirmed |
| Potential aerosol mass | PAM | W. Brune (Penn State) / J.L. Jimenez (CU-Boulder) | Kang et al., 2007 | Confirmed |
| Submicron particle number distributions | TSI SMPS | J.L. Jimenez (CU-Boulder) | TSI 3936 | Confirmed |
| NMR analysis of WSOC | Filter collection with post-analysis | Stefano Decesari and Maria Cristina Facchini (CNR-ISAC, Italy) | Decesari et al., 2007 & Moretti et al., 2008 | Confirmed |
| Organosulfates and nitrooxy organosulfates | Filter collection with post-analysis by electrospray-MS/MS | Jason Surratt (University of North Carolina-Chapel Hill) | Surratt et al., 2008 | Confirmed |
| Total particle number | TSI Water CPC 3786 | J.L. Jimenez (CU-Boulder) | TSI 3786 | Tentative |
| Particle number distributions (300 nm - 10 um) | Grimm OPC 1.109 | J.L. Jimenez (CU-Boulder) | Grimm 1.109 | Tentative |
| OC and EC | 1 hr Sunset Labs thermal-optical analyzer | R. Weber (Georgia Tech) | Sunset Labs Field Instrument | Pending |
| Water-Soluble OC in Particles | PILS and mist chamber + online WSOC | R. Weber (Georgia Tech) | Hennigan et al., 2008 | Pending |
| PM1 Carboxylic acids | PILS + ion chromatography | R. Weber (Georgia Tech) | Pending | |
| 1-hr molecular tracers (particles and semivol.) | Thermal-Desorption Aerosol GC-MS (TAG) | A. Goldstein (Berkeley) & Susanne Hering (Aerosol Dynamics) | Williams et al., 2006 & Williams et al., 2007 | Pending |
| 14C analysis of OC, EC, Water-Insoluble OC (WIOC) and WSOC (24 hr) | Filters + off-line Accelerator MS | A. Prevot (PSI, Switzerland) | Szidat et al., 2006 | Pending |
| 14C analysis of Total Carbon (~3 hr for 100 samples) | Filters + off-line Accelerator MS | A. Prevot (PSI, Switzerland) | Not published yet with this time resolution | Pending |
| Elements and metals (1-hr resolution) | Rotating impactor + synchrotron XRF postanalysis | A. Prevot (PSI, Switzerland) | Not published yet with this time resolution | Pending |
| PM semivolatile and non-volatile organics | High-resolution PTR-TOF MS | R. Holzinger (U. Utrecht, Netherlands) | Not published yet | Pending |
| HR-MS analysis of WSOC/N compounds | PILS-collector + Electrospray-Orbitrap ultrahigh resolution mass spec. | A. Laskin and J. Laskin (DOE PNNL EMSL) | Smith et al., 2009 & Laskin et al., 2009 | Pending |
| Organic N and inorganic ions | Steam-Jeat Aerosol Collector (SJAC) system with on-line ion chromatography and high sensitivity TOC/TN combustion unit | A. Khlystov (Duke University) | Not published yet, Description in AK's web page | Pending |
| Black Carbon Single Particle Composition | SP2-AMS | James Allan and Hugh Coe, University of Manchester, UK | Trimborn et al., 2008. AMS Users Meeting, Sep. 2008, Manchester UK. | Tentative |
Reference Information
- CARB homepage on CalNex
- CalNex Science Questions
- CalNex White Paper
- NOAA CalNex Science Plan
- Historical Air Quality Data from LA
- South Coast Air Quality Management District (LA local Air Quality Agency)
