DOI: 10.5061/dryad.g4f4qrg1x
title: Mobile ground-based measurements of methane mixing ratios at New York state landfills

description: Methane (CH4) concentrations were measured from ground-level mobile
 monitoring at New York State (NYS) landfills over three separate field
 campaigns in 2021 and 2022. The data files are broken up by year and site
 visited. Methane was measured by both an Aerodyne Dual Quantum-Cascade LAS
 (QCLS) and a Picarro G2204 cavity ring-down spectrometer.  Both
 the QCLS and Picarro spans were calibrated with a two-tank calibration
 pre- and post-deployment, and the zero-offset was measured throughout each
 field campaign. Calibration tanks are traceable to standards calibrated by
 the Central Calibration Laboratory (CCL) at the National Oceanographic and
 Atmospheric Administration (NOAA) Global Monitoring Laboratory in Boulder,
 CO, which maintains the World Meteorological Organization (WMO) CH4 scale
 (WMO X2004A). Both CH4 datasets were also corrected for drift in the
 analyzer clock and response time from inlet overflow checks. Since the
 QCLS measured a consistently higher baseline than the Picarro, the Picarro
 data was baseline-corrected to the QCLS. Missing QCLS data were
 supplemented with available Picarro data.  The datasets also
 include the measured latitude and longitude coordinates and meteorological
 parameters from the nearest NYS Mesonet station (Brotzge et al., 2020).
 These meteorological parameters were averaged between the stations and
 include temperature at 2 m (C),  ambient station pressure (mb),
 average wind speed (m/s) and direction (degrees) at 10 m, and solar
 insolation (W/m^2). 
description: # Mobile ground-based measurements of methane mixing ratios at New York
 state landfills Dataset DOI:
 [10.5061/dryad.g4f4qrg1x](10.5061/dryad.g4f4qrg1x) ## Description of the
 data and file structure Methane concentrations were measured using
 ground-level mobile monitoring. The dataset includes latitude, longitude,
 meteorological data, and two separate measurements of methane
 concentrations.  ### Files and variables #### File: Data.zip
 **Description:** The data files are broken up by each field campaign from
 June 2021, November 2021, and July 2022. The filename is the site visited,
 e.g. in the June 2021 folder the filename millseat_0614.csv is the data
 measured from Mill Seat Landfill on 06/14/2021.  Each dataset contains 1
 second data of the time and GPS coordinates, surface temperature (C),
 station pressure (mb), wind speed (m/s) at 10 m, wind direction (degrees)
 at 10 m, solar insolation (W/m^2), and the methane variables. The
 meteorological variables were averages of the nearest NYS Mesonet stations
 to the landfill (Brotzge et al., 2020).  The methane variables were
 measured by an Aerodyne QCLS and a Picarro. The dataset provides both
 measurements in ppb and ppm. The calibrated and inlet overflow
 time-corrected data for both measurements are listed as:
 CH4_ppm_qcls, CH4_ppb_qcls, CH4_ppm_picarro, CH4_ppb_picarro. Since the
 Picarro baseline was consistently lower than the QCLS, the Picarro data
 was baseline- and peak-corrected to the QCLS. Any missing QCLS data was
 then supplemented by the Picarro data. These variables
 are: CH4_ppm_qcls_scaled,  CH4_ppb_qcls_scaled,  CH4_ppm_picarro_scaled,  CH4_ppb_picarro_scaled. Reference: Brotzge, J. A.; Wang, J.; Thorncroft, C. D.; Joseph, E.; Bain, N.; Bassill, N.; Farruggio, N.; Freedman, J. M.; Hemker, K.; Johnston, D.; Kane, E.; McKim, S.; Miller, S. D.; Minder, J. R.; Naple, P.; Perez, S.; Schwab, J. J.; Schwab, M. J.; Sicker, J. A Technical Overview of the New York State Mesonet Standard Network. *J Atmos Ocean Technol* **2020**, *37* (10), 1827–1845. [https://doi.org/10.1175/JTECH-D-19-0220.1](https://doi.org/10.1175/JTECH-D-19-0220.1)