Tropospheric Chemistry: Instruments

Aircraft and Ground-based (including ship and mobile lab) Instruments

Abbreviation

Instrument

Method

Contacts

ACES

Airborne Cavity Enhanced Spectrometer

Cavity enhanced absorption spectroscopy measuring glyoxal (CHOCHO), nitrous acid (HONO), and nitrogen dioxide (NO2)

Kyle Zarzana, Rebecca Washenfelder, Steve Brown

Acid CIMS

Acid Chemical Ionization Mass Spectrometer

Negative ion proton transfer chemical ionization mass spectrometry using acetate ions as reagent ions to measure all carboxylic acids (except acetic acid)

Patrick Veres

ARNOLD

Atmospheric Ring-down Nitrogen Oxide Laser Detector

Cavity Ring Down Spectroscopy to measure NO3, N2O5, NO2, NO, O3

Steve Brown, Bill Dubé

BBCES

Broadband Cavity Enhanced Spectrometer

Cavity enhanced broadband spectroscopy measuring aerosol extinction in the ultraviolet spectral region

Rebecca Washenfelder, Steve Brown

C2H6

Ethane Spectrometer

Tunable infrared laser diode absorption spectrometry

Jeff Peischl, Tom Ryerson

CO

Carbon Monoxide

tbd

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CO2

Carbon Dioxide

Dual-beam (non-dispersive) infrared absorption to measure CO2

Jeff Peischl, Tom Ryerson

CO2 / CH4

Carbon Dioxide and Methane

Wavelength-scanned cavity ring down to measure CO2 and CH4

Jeff Peischl, Tom Ryerson

HNO3 CIMS

Nitric Acid Chemical Ionization Mass Spectrometer

Chemical Ionization Mass Spectrometry with I- or SiF5- reagent ion to measure HNO3, HCOOH, HONO, Br2, BrO, BrCl

Andy Neuman

N2O / CO

Nitrous Oxide and Carbon Monoxide

Off-axis integrated cavity output spectroscopy (OA-ICOS)

Jeff Peischl, Tom Ryerson

NH3

Ammonia Ring-down

Wavelength-scanned cavity ring down to measure NH3

Scott Eilerman

NH3 CIMS

Ammonia Chemical Ionization Mass Spectrometer

Chemical Ionization Mass Spectrometry using protonated acetone dimer ((C3H6O)H+(C3H6O)) ion chemistry to measure NH3

Scott Eilerman

NOxCaRD

Nitrogen Oxides by Cavity Ring Down

NO, NO2, O3, NOy measured by diode laser cavity ring down spectroscopy

Dorothy Fibiger, Erin McDuffie, Steve Brown

NOyO3

Nitrogen Oxides and Ozone

Chemical reactions that produce near-infrared light to measure NO, NO2, NOy, O3

Chelsea Thompson, Steve Sjostedt, Tom Ryerson

PAN CIMS

PAN Chemical Ionization Mass Spectrometer

Chemical Ionization Mass Spectrometry using I- as reagent ion to measure peroxyacetyl nitrates (PANs)

Patrick Veres

RONALD

Reactive Oxides of Nitrogen

NO3, N2O5 measured by cavity ring down spectroscopy

Kyle Zarzana, Steve Brown

SO2

Sulfur Dioxide

Pulsed UV fluorescence to measure SO2

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VOCs (multiple instruments)

Volatile Organic Compounds

Proton-Transfer-Reaction Mass Spectrometery, Proton-Transfer-Ion-Trap Mass Spectrometry, Laser Photo-Acoustic Spectroscopy, Chemical Ionization Mass Spectrometry to measure Alkanes, Alkenes, Alkynes, Aromatics, Biogenic VOCs (isoprene, monoterpenes), Alcohols, Ketones, Aldehydes, Nitriles, Dimethyl sulfide, Halocarbons, Alkyl nitrates

Joost deGouw, Carsten Warneke, Bin Yuan, Abby Koss

WAS/GC-MS

Whole air samples (WAS) analyzed by Gas chromatography-mass spectrometry (GC-MS)

In-flight collection of whole air samples with post-flight analysis via dual channel, "cryo-mechanical" gas chromatography-mass spectrometry; Ground-based cryogenic pre-concentration of VOCs with immediate analysis via dual channel, gas chromatography-mass spectrometery

Jessica Gilman, Brian Lerner

Decommissioned Instruments

Abbreviation

Instrument

Method

Contacts

AFSR

Actinic Flux SpectroRadiometer

Measures solar radiation and photolysis rates via spectral actinic flux for many species

Harald Stark

CO

Mobile Atmosphere-Biosphere Environmental Laboratory Carbon monoxide

Vacuum-UV resonance fluorescence

Brian Lerner

CO2

Mobile Atmosphere-Biosphere Environmental Laboratory Carbon dioxide

Non-dispersive IR absorbance

Brian Lerner

j-values

Mobile Atmosphere-Biosphere Environmental Laboratory Photolysis rates

Filter radiometry

Brian Lerner

O3

Ozone

UV absorbance

Eric Williams