AN006

Attributes in entity 4: N2 & N2O gas sampling: concentrations & 15N labels		Details
1. DBCODE Definition: Database Code Domain: enum
2. ENTITY Definition: Entity number Units: number Domain: range (minimum = 4.  maximum = 4.)
3. SITEID Definition: Abbreviation assigned to each study site Domain: place
4. SAMPLE_DATETIME Definition: Date sample collected Units: date as datetime type Domain: range (minimum = May 14 2003 11:46AM  maximum = Feb 23 2006 1:00PM)
6. SAMPLEPERIOD Definition: Standard period of sample collection relative to isotope and/or tracer addition Domain: enum
7. EXPTIME_ISOTOPE Definition: Time since start of isotope addition Units: number of minutes of time Domain: range (minimum = 0.  maximum = 3000.)
8. STATION Definition: Sample collection station Domain: enum
9. DISTANCE Definition: Distance of sample station from isotope addition point; negative values are upstream Units: meters Domain: range (minimum = 10.  maximum = 1872.)
10. ANALYTICALLAB Definition: Laboratory analyzing isotope and mass Domain: enum
10. REP_NO Definition: Sample lab replicate number Domain: enum
11. VOLUMEWATERSAMPLE Definition: Water volume collected in sampling syringe Units: milliliters Domain: range (minimum = 0.  maximum = 127.)
12. VOLUMEHEADSPACE_HE Definition: Volume helium added to syringe headspace Units: milliliters Domain: range (minimum = 0.  maximum = 36.)
13. VOLUMEHEADSPACE_INJECTED Definition: Volume headspace gas injected into sample vial Units: milliliters Domain: range (minimum = 0.  maximum = 87.)
14. TEMPERATURE_STREAM Definition: In-stream water temperature during sampling Units: degrees Celsius Domain: range (minimum = 0.0  maximum = 37.0)
15. TEMPERATURE_HEADSPACE Definition: Temperature of headspace at equilibrium Units: degrees Celsius Domain: range (minimum = 0.0  maximum = 295.0)
16. BAROMETRICPRESSURE Definition: Barometric pressure at time of sampling Units: atmosphere Domain: range (minimum = 0.0000  maximum = 1.0210)
17. SPC Definition: Specific conductance of stream water during sampling Units: micro siemens per centimeter Domain: range (minimum = 0.3  maximum = 490.3)
18. D15N_N2 Definition: del 15N-nitrogen gas measured in headspace sample Units: permil Domain: range (minimum = -18.0  maximum = 97.7)
19. N2_MASS Definition: Nitrogen gas mass in exetainer, from mass spec lab Units: millimoles Domain: range (minimum = -1.2540  maximum = 1.2420)
20. D15N_N2O Definition: del 15N nitrous oxide gas measured in headspace sample Units: permil Domain: range (minimum = -287.2  maximum = 11476.0)
21. N2O_MASS Definition: Nitrous oxide gas mass in exetainer, from mass spec lab Units: nanomoles Domain: range (minimum = -5.5890  maximum = 358.7600)
22. N2O_CONCENTRATION Definition: Nitrous oxide gas concentration, from MSU GC laboratory Units: micromoles per liter Domain: range (minimum = -0.0002  maximum = 0.3938)
23. NOTES Definition: Notes from sites or metadata coordinator Domain: freetext