NDLI: Advances in Air–Sea $$\hbox {CO}_2$$ Flux Measurement by Eddy Correlation

Content Provider	Springer Nature Link
Author	Blomquist, Byron W. Huebert, Barry J. Fairall, Christopher W. Bariteau, Ludovic Edson, James B. Hare, Jeffrey E. McGillis, Wade R.
Copyright Year	2014
Abstract	Eddy-correlation measurements of the oceanic $$\hbox {CO}_2$$ flux are useful for the development and validation of air–sea gas exchange models and for analysis of the marine carbon cycle. Results from more than a decade of published work and from two recent field programs illustrate the principal interferences from water vapour and motion, demonstrating experimental approaches for improving measurement precision and accuracy. Water vapour cross-sensitivity is the greatest source of error for $$\hbox {CO}_2$$ flux measurements using infrared gas analyzers, often leading to a ten-fold bias in the measured $$\hbox {CO}_2$$ flux. Much of this error is not related to optical contamination, as previously supposed. While various correction schemes have been demonstrated, the use of an air dryer and closed-path analyzer is the most effective way to eliminate this interference. This approach also obviates density corrections described by Webb et al. (Q J R Meteorol 106:85–100, 1980). Signal lag and frequency response are a concern with closed-path systems, but periodic gas pulses at the inlet tip provide for precise determination of lag time and frequency attenuation. Flux attenuation corrections are shown to be $$<$$ 5 % for a cavity ring-down analyzer (CRDS) and dryer with a 60-m inlet line. The estimated flux detection limit for the CRDS analyzer and dryer is a factor of ten better than for IRGAs sampling moist air. While ship-motion interference is apparent with all analyzers tested in this study, decorrelation or regression methods are effective in removing most of this bias from IRGA measurements and may also be applicable to the CRDS.
Starting Page	245
Ending Page	276
Page Count	32
File Format	PDF
ISSN	00068314
Journal	Boundary-Layer Meteorology
Volume Number	152
Issue Number	3
e-ISSN	15731472
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-04-12
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Air–sea gas exchange Carbon dioxide Cavity ring-down spectrometer Eddy correlation Flux measurement Infrared gas analyzer Atmospheric Sciences Meteorology Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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