Atmospheric Measurement Techniques Discussions www.atmos-meas-tech-discuss.net 1867-8610 2 4 2009 10.5194/amtd-2-1973-2009 http://www.atmos-meas-tech-discuss.net/2/1973/2009/ http://www.atmos-meas-tech-discuss.net/2/1973/2009/amtd-2-1973-2009.html http://www.atmos-meas-tech-discuss.net/2/1973/2009/amtd-2-1973-2009.pdf 1973 2025 2009-08-24 Determining the sea-air flux of dimethylsulfide by eddy correlation using mass spectrometry B. W. Blomquist B. J. Huebert C. W. Fairall University of Hawaii, Department of Oceanography, Honolulu, HI, USA NOAA Earth System Research Laboratory, Physical Sciences Division, Boulder, CO, USA Mass spectrometric measurement of DMS by atmospheric pressure ionization with an isotopically labeled standard (APIMS-ILS) is a sensitive method with sufficient bandpass for direct flux measurements by eddy correlation. Use of an isotopically labeled internal standard greatly reduces instrumental drift, improving accuracy and precision. APIMS-ILS has been used in several recent campaigns to study ocean-atmosphere gas transfer and the chemical budget of DMS in the marine boundary layer. This paper provides a comprehensive description of the method and errors associated with DMS flux measurement from ship platforms. The APIMS-ILS instrument used by most groups today has a sensitivity of 100–200 counts s^−1 pptv^−1, which is shown to be more than sufficient for flux measurement by eddy covariance. Mass spectral backgrounds (blanks) are determined by stripping DMS from ambient air with gold. The instrument is found to exhibit some signal loss, with a half-power frequency of ≈1 Hz, but a correction based on an empirically determined instrument response function is presented. 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