The BOREAS Information System
Trace Gas Biogeochemistry (TGB)


TGB-9: Ambient Measurements of Ozone, Nitrogen Oxides and Non-Methane Hydrocarbons


P.I.(s): Hiromi Niki -- York University, Ontario

Objectives: An intensive ground based measurement campaign of ambient concentrations of biogenic and anthropogenic C2-C10 non-methane hydrocarbons at one of the Intensive Study Sites over the course of the 1994 experiment year, with full participation in the Intensive Field Campaigns (IFC) and possibly in the Focused Field Campaign during the spring thaw. A weekly to twice weekly hydrocarbon sampling schedule was intituted through the years 1993, 1994 and 1995 to provide season distribution data on these hydrocarbons.

Location: SSA (some NSA)
Sites: young and old aspen, black spruce, pine.
Duration: August 1993, mostly IFCs 1994.

TGB-9 Data Sets

  • Tower NMHC Mixing Ratio
  • Isoprene data

  • Get some TGB-9 data using FTP (BOREAS Investigators only, password required). [FTP Help]

    TGB-9 BOREAS Operations 1994


    Objectives:

    1. To identify and quantify the trace hydrocarbons present in the boreal forest, with a view towards discovering what pollutant sources impact upon the forest, and what oxidative processes are important in the boreal atmosphere.
    2. To collect ambient samples in a manner that allows calculation of the flux of biogenic emissions using the gradient method.


    Types of Data Collected:
    Ambient samples were collected in stainless steel canisters from two different heights above the forest canopy. Samples were returned to our laboratory in Toronto for analysis by GC-FID. Concentrations, in ppbV, are reported in BORIS for many nonmethane hydrocarbons. Other NMHC concentrations are available; contact TGB-9 directly for more information.

    Summary of Places and Times of Measurements:
    Old Black Spruce Site, Southern Study Area
    May 31 - June 5, 1994
    July 20 - July 24, 1994
    September 1 - September 7, 1994

    Old Jack Pine Site, Southern Study Area
    June 7 - June 12
    July 27 - August 2
    September 9, 11, 15

    Old Aspen Site, Southern Study Area
    August 4 - August 8
    September 12 - 14

    Known Problems and Caveats:
    Of the biogenic data, isoprene is absolutely the most reliable, alpha-Pinene is also fairly reliable. Other monoterpenes we continue to check, but we guess we are in the correct order of magnitude. Data for anthropogenic NMHCs reported we are quite confident in.

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    Last Updated: November 5, 1997