Whittier_CH2O_NO2_MAXDOAS_20200326

INSTRUMENT: Airyx Skyspec Compact 150

PLATFORM:   Whittier College, Science and Learning Center

LOCATION:   Latitude: 33.97680° North

                     Longitude: 118.03040° West

                     Elevation: 130.0 Meters

AUTHORS:    Peter Peterson

            Department of Chemistry

            Whittier College

            13406 E. Philadelphia St. Whittier, CA 90602, USA

            email: [e-mail]

            phone: [phone]

The files are comma-delimited text files with explanatory column headers defined below. 

We welcome collaborations and are excited about working with others to make discoveries regarding atmospheric chemistry in eastern Los Angeles county. These data are ground-based NO2 and HCHO remote sensing measurements collected by the Peterson group at Whittier College. If the data are downloaded for the purpose of scientific publication, we should be informed of the possible use of the data so we work with this group and ensure the data are being used appropriately.  If the work leads to publishable findings, we will work with collaborating scientists to determine if co-authorship or acknowledgement is appropriate.  

All date and time stamps are in UTC and are the starting time of the retrieval period which utilizes spectra collected over 30 min; hence the times are the midpoint of the measurement. 

These data files contain NO2 and HCHO retrievals from spectra collected using a commercial MAX-DOAS instrument. This instrument and DOAS fitting procedure are detailed in:

The retrieval of vertical profiles from spectral data is done using HEIPRO which is described in: 

Yilmaz, S. (2012). Retrieval of Atmospheric Aerosol and Trace Gas Vertical Profiles using Multi-Axis Differential Optical Absorption Spectroscopy. University of Heidelberg. Retrieved from http://archiv.ub.uni-heidelberg.de/volltextserver/id/eprint/13128

The file columns and units are described below: 

== Column descriptions for metadata ==Date: MM/DD/YYYY HH:MM (UTC)(NO2 or HCHO)_VCD,molec cm^-2, Vertical Column DensityErr_(NO2 or HCHO)_VCD,molec cm^-2,UncertaintyData,Vertical Column Densitysurf_vmr,ppbv,NO2 or HCHO,Nitrogen Dioxide or Formaldehyde Volume Mixing Ratiovmr_m_err,ppbv,UncertaintyData,Volume Mixing RatioDOFS, integer, Degrees of Freedomf_two, dimensionless, fraction of retrieved column in lowest 200 mprof, ppmv, vertical profile of average vmr in 40 100 m layers