In-situ tower data

TITLE:  In-situ tower greenhouse gas data (The Pennsylvania State University)
PROJECT:  Marcellus Methane
DATES:  May 2015 – February 2017 (for East, Central, and North sites)
May 2015 – current for South site

ABSTRACT:  Quantification of regional emissions resulting from natural gas extraction activities is critical in terms of determining the climate effects of natural gas usage compared to coal.  The leakage rate is not well known, and has large implications for the greenhouse impact of this energy source.   Towards that end data are collected at four towers in the Marcellus Shale gas region, with a tower south of the primary natural gas extraction region serving as a background site.  Cavity ring down spectrometer (CRDS, Picarro, Inc, G2132-i) measurements of  CH4 and CO2 mole fractions, and the isotopic ratio of CH4, are collected at these tower sites at heights of between 46 and 61 m above ground level.   The sample air stream is dried using a Nafion dryer.  The laboratory and field calibration technique is described in Miles et al., (2017, to be submitted to Atmos, Meas. Tech.)  Flask to in-situ comparisons indicate mean differences of 2+-2 ppb CH4, 0.2+-0.4 ppm CO2, and 0.0+-0.4 permil at the South tower.  Ten-minute averages are reported here, with the minimum and maximum time included in the average indicated.  Note that the ethane (C2H6) is reported, but not well calibrated.

COLUMN HEADERS (processed data):  Site name, Height (m AGL), Time (minimum fractional day of year of the measurement, GMT), Time (maximum fractional day of year of the measurement, GMT), Year, DOY (day of year), Hour (GMT), CO2 (dry mole fraction, ppm), Standard_Deviation (during measurement, ppm), CH4(dry mole fraction, ppb), Standard_Deviation (during measurement, ppb), isotopic ratio (13C/12C, permil), number of points included in average, Flag, H2O(percent), C2H6(ppb)

COLUMN HEADERS (raw data):  DATE, TIME, FRAC_DAYS_SINCE_JAN1, FRAC_HRS_SINCE_JAN1, JULIAN_DAYS, EPOCH_TIME, ALARM_STATUS,              INST_STATUS, CavityPressure, CavityTemp, WarmBoxTemp, EtalonTemp, DasTemp, MPVPosition, solenoid_valvess, OutletValve, species, 13CH4, H2O, CO2, Delta_iCH4_Raw,            HP_12CH4, HP_Delta_iCH4_2min, HP_Delta_iCH4_30s, HP_Delta_iCH4_5min, HP_Delta_iCH4_Raw, HR_12CH4, HR_Delta_iCH4_2min, HR_Delta_iCH4_30s, HR_Delta_iCH4_5min , HR_Delta_iCH4_Raw, ChemDetect, HC_base_offset_diff, HC_slope_offset_diff, HC_res_diff, peakheight_5, peak0_spec, ch4_splinemax, peak30_spec, peak24_spec, peak_24, peak_30, PPF_res, PPF_base_offset, PPF_slope_offset, PPF_shift, PPF_CH4_conc, PPF_H2O_conc, PPF_C2H6_conc, PPF_C2H4_conc, PPF_NH3_conc, PPF_H2S_conc

FAIR USE POLICY: Permission to download this data does not grant permission to use the information contained in that data for publication or any commercial use.  Please request permission for such use by e-mailing the Penn State group ( before any commercial use or publication. If you have any questions about the use of these data or the Fair Use policy, please contact a member of the group at

Natasha Miles (
Scott Richardson (


REQUEST  INFLUX TOWER  DATA ACCESS  VIA AN EMAIL TO  Include your name, affiliation, and intended use.  Please keep PI’s informed about any publication plans.


Link to data  (Please send an email to to request a password.)

The data is also available at:

Miles, N.L., D.K. Martins, S.J. Richardson, T. Lauvaux, K.J. Davis, B.J. Haupt, and C. Rella, 2017. In-situ tower atmospheric methane mole fraction and isotopic ratio of methane data, Marcellus Shale Gas Region, Pennsylvania, USA, 2015-2016. Data set. Available on-line [] from The Pennsylvania State University Data Commons, University Park, Pennsylvania, USA.