Mobile ground-based measurements of methane mixing ratios at New York state landfills

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).