51,1001 Stephens, Britton National Center for Atmospheric Research Medusa Whole Air Flask Sampler ATom 1,1 2017,10,19,2021,1,21 0 Start_UTC, seconds 16 1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0 -99999,-99999,-99999,-99999,-99999,-99999,-99999,-99999,-99999,-99999,-99999,-99999,-99999,-99999,-99999,-99999 Stop_UTC, seconds, time when flask was closed Mean_UTC, seconds, kernel-weighted representative sampling time position, integer, order of flasks taken (1-32) upstream_pressure, torr, kernel-weighted pressure reading at upstream pressure controller downstream_pressure, torr, kernel-weighted pressure reading at downstream pressure controller bypass_pressure, torr, kernel-weighted pressure of bypass line sample_pressure, torr, kernel-weighted representative pressure in sampling line flow, L/min, kernel-weighted representative mean flow during sampling flask_pressure, torr, fill pressure of each flask O2N2_MED, per meg, deviations in the ratio of O2 to N2 on the Scripps O2 Laboratory O2 Scale ArN2_MED, per meg, deviations in the ratio of Ar to N2 on the Scripps O2 Laboratory Argon Scale O2N2star_MED, per meg, deviations in the ratio of O2 to N2 with thermal artifacts and variations due to air-sea exchange caused by solubility changes removed CO2_MED, ppm, dry air mole fraction of CO2 on Scripps O2 Laboratory CO2 Scale d13CO2_MED, per mil, deviation in the 13C/12C Stable Carbon Isotope Ratio in CO2 relative to Vienna Pee Dee Belemnite d18OCO2_MED, per mil, deviation in the 18O/16O Stable Oxygen Isotope Ratio in CO2 relative to Vienna Pee Dee Belemnite D14CO2_MED, per mil, deviation from the Modern standard 14C/C ratio 0 21 PI_CONTACT_INFO: stephens@ucar.edu PLATFORM: NASA DC-8 aircraft LOCATION: DC-8 location data available at http://espoarchive.nasa.gov/archive/fileinfo/MMS-FlightPath_DC8_20160712.ict ASSOCIATED_DATA: See http://espoarchive.nasa.gov/archive/browse/atom UNCERTAINTY: N/A INSTRUMENT_INFO: N/A DATA_INFO: N/A DM_CONTACT_INFO: stephens@ucar.edu PROJECT_INFO: N/A ULOD_FLAG: -7777 ULOD_VALUE: N/A LLOD_FLAG: -8888 LLOD_VALUE: N/A STIPULATIONS_ON_USE: Until made public, only the ATom science team is allowed to use this data, per the ATom data protocol. OTHER_COMMENTS: Data are start and stop times for individual flask samples taken with Medusa. The Mean_UTC variable is the representative time of each sample as calculated with an averaging kernel. See Bent 2014 (PhD thesis, UCSD) for details. All pressure variables are measured in situ during sampling except for flask_pressure, which is the final pressure of the flask measured during analysis. In each flask the O2/N2 ratio and the Ar/N2 ratio are measured. An altitude-dependent fractionation correction using d(Ar/N2) is applied to d(O2/N2) to produce O2N2star_MED. Note that the CO2 mole fraction is reported on the Scripps Institution of Oceanography O2 Program CO2 Scale. CO2 is extracted after CO2 and O2/N2 content analysis for later isotope analysis. REVISION: R3 R3: updated R2: updated R1: updated R0: final data. Start_UTC,Stop_UTC,Mean_UTC,position,upstream_pressure,downstream_pressure,bypass_pressure,sample_pressure,flow,flask_pressure,O2N2_MED,ArN2_MED,O2N2star_MED,CO2_MED,d13CO2_MED,d18OCO2_MED,D14CO2_MED 29685,31311,31266,1,170,521,745,861,2742,729,-640.53,16.36,-640.89,408.71,-99999,-99999,-99999 31318,32898,32858,2,140,611,815,833,2162,726,-607.6,5.93,-605.19,402.6,-99999,-99999,-99999 32905,34188,34154,3,170,521,802,832,2623,710,-617.45,15.86,-617.68,404.2,-99999,-99999,-99999 34194,34608,34575,4,170,521,798,846,2694,721,-633.76,-0.09,-629.76,407.34,-99999,-99999,-99999 34614,36069,36029,5,140,611,805,826,2152,730,-618.26,-7.05,-612.41,403.26,-99999,-99999,-99999 36076,36876,36839,6,170,521,794,837,2640,719,-628.15,0.83,-624.39,405.57,-99999,-99999,-99999 36882,37401,37367,7,170,521,792,833,2615,716,-620.75,11.8,-619.9,404.24,-99999,-99999,-99999 37408,38019,37986,8,170,521,794,842,2693,724,-613.87,-5.63,-608.4,402.78,-99999,-99999,-99999 38025,40266,40220,9,110,670,792,793,1568,726,-611.77,-10.97,-604.88,402.5,-99999,-99999,-99999 40272,41761,41725,10,170,521,776,822,2632,711,-599.05,4.84,-596.36,401.1,-99999,-99999,-99999 41767,42888,42854,11,170,521,790,829,2633,721,-602.02,-6.34,-596.36,402.19,-99999,-99999,-99999 42895,45652,45603,12,110,670,792,793,1582,727,-613.18,-14.84,-605.26,402.9,-99999,-99999,-99999