DOI: 10.5061/dryad.612jm649n
title: ASRC Rooftop CO observations, NYCMA observed and simulated ΔCO, and relative NYC surface influence

description: Carbon monoxide (CO) observations from the Advanced Science Research
 Center (ASRC) Rooftop Observatory in Hamilton Heights, West Harlem,
 Manhattan, calculated background CO, observed, and simulated CO
 enhancements (ΔCO) for the New York City metropolitan area (NYCMA), and
 relative NYC surface influence from HRRR-STILT (the Stochastic
 Time-Inverted Lagrangian Transport model coupled to High-Resolution Rapid
 Refresh meteorology). All values reported hourly for January-May
 2019-2022, when available. Observations and analyzed quantities are as
 described in "Multi-year observations of variable incomplete
 combustion in the New York megacity" by Luke D. Schiferl, Cong Cao,
 Bronte Dalton, Andrew Hallward-Driemeier, Ricardo Toledo-Crow, and Róisín
 Commane.
description: # ASRC Rooftop CO observations, NYCMA observed and simulated ΔCO, and
 relative NYC surface influence
 [https://doi.org/10.5061/dryad.612jm649n](https://doi.org/10.5061/dryad.612jm649n) Carbon monoxide (CO) observations from the Advanced Science Research Center (ASRC) Rooftop Observatory in Hamilton Heights, West Harlem, Manhattan, calculated background CO, observed, and simulated CO enhancements (ΔCO) for the New York City metropolitan area (NYCMA), and relative NYC surface influence from HRRR-STILT (the Stochastic Time-Inverted Lagrangian Transport model coupled to High-Resolution Rapid Refresh meteorology). All values reported hourly for January-May 2019-2022, when available. For completeness, we also include CO observations from the Environmental Protection Agency (EPA) Air Quality System (AQS) at the City College of New York (CCNY) and Cornwall, Connecticut sites. ## Description of the data and file structure The data is contained in a csv file called "ASRC_CO_Observations.csv", where each row is an hour, each column is a variable as below: | Variable | Unit | Description | | :---------------------- | :------------------ | :------------------------------------------------------------------------------------ | | DATETIME\_START.UTC | YYYY-MM-DD HH:MM:SS | Hour start date and time in Coordinated Universal Time (UTC) | | DATETIME\_END.UTC | YYYY-MM-DD HH:MM:SS | Hour end date and time in Coordinated Universal Time (UTC) | | DATETIME\_START.EST | YYYY-MM-DD HH:MM:SS | Hour start date and time in Eastern Standard Time (EST) | | DATETIME\_END.EST | YYYY-MM-DD HH:MM:SS | Hour end date and time in Eastern Standard Time (EST) | | CO\_obs.ASRC | ppb | CO observation at ASRC site | | CO\_obs.CCNY | ppb | CO observation at CCNY site | | CO\_obs.Cornwall | ppb | CO observation at Cornwall site | | city\_scale.ASRC | TRUE/FALSE | TRUE = city-scale, FALSE = local-scale for CO\_obs.ASRC | | city\_scale.CCNY | TRUE/FALSE | TRUE = city-scale, FALSE = local-scale for CO\_obs.CCNY | | CO\_bkgd.ASRC | ppb | Background CO as fifth percentile of rolling 10-day window of city-scale CO\_obs.ASRC | | CO\_bkgd.CCNY | ppb | Background CO as fifth percentile of rolling 10-day window of city-scale CO\_obs.CCNY | | CO\_bkgd.Cornwall | ppb | Background CO as mean of rolling 10-day window of CO\_obs.Cornwall | | dCO\_obs.ASRC\_ASRC | ppb | Observed ΔCO as CO\_obs.ASRC – CO\_bkgd.ASRC for city-scale observations | | dCO\_obs.ASRC\_Cornwall | ppb | Observed ΔCO as CO\_obs.ASRC – CO\_bkgd.Cornwall for city-scale observations | | dCO\_obs.CCNY\_CCNY | ppb | Observed ΔCO as CO\_obs.CCNY – CO\_bkgd.CCNY for city-scale observations | | dCO\_obs.CCNY\_Cornwall | ppb | Observed ΔCO as CO\_obs.CCNY – CO\_bkgd.Cornwall for city-scale observations | | dCO\_sim.EDGAR\_monthly | ppb | Simulated ΔCO as monthly EDGAR CO emissions × surface influence footprint | | dCO\_sim.EDGAR\_annual | ppb | Simulated ΔCO as annual EDGAR CO emissions × surface influence footprint | | rel\_sfc\_inf.NYC | unitless | Relative 24-hour total surface influence for NYC subdomain | CO_obs.ASRC was measured by several instruments throughout the collection period: (i) Picarro G2401-m for 2019 and 2020 (reporting at 0.5–1 Hz), (ii) Picarro G2401 for 2021 (reporting at ~0.3 Hz), and (iii) Aerodyne SuperDUAL for 2022 (reporting at 1 Hz). Each instrument was calibrated using gas cylinders that are traceable to standards calibrated by the Central Calibration Laboratory (CCL) at the National Oceanographic and Atmospheric Administration (NOAA) Global Monitoring Laboratory (GML) in Boulder, CO. CCL maintains the World Meteorological Organization (WMO) CO scale (WMO X2014A). The Aerodyne SuperDUAL set-up at ASRC is described by Commane et al. (2023). Missing data is reported as NA. CO_obs.ASRC is pre-filtered keeping only hours with at least 50% valid sub-hourly measurements (e.g., at least 1800 1-Hz measurements). Additional observations and analyzed quantities are as described in "Multi-year observations of variable incomplete combustion in the New York megacity" by Luke D. Schiferl, Cong Cao, Bronte Dalton, Andrew Hallward-Driemeier, Ricardo Toledo-Crow, and Róisín Commane. ## Access information The CCNY and Cornwall CO observations (CO_obs.CCNY, CO_obs.Cornwall) are also available from [https://aqs.epa.gov/aqsweb/airdata/download_files.html](https://aqs.epa.gov/aqsweb/airdata/download_files.html). The EDGAR CO emissions used to create simulated ΔCO (dCO_sim.EDGAR_monthly, dCO_sim.EDGAR_annual) are available from [https://edgar.jrc.ec.europa.eu/index.php/dataset_ap61](https://edgar.jrc.ec.europa.eu/index.php/dataset_ap61). The STILT model and HRRR ARL files used to create the HRRR-STILT surface influence footprints are available from [https://uataq.github.io/stilt/#/](https://uataq.github.io/stilt/#/) and [https://www.ready.noaa.gov/archives.php](https://www.ready.noaa.gov/archives.php).