Abstract
We studied short-term pCO 2 and O 2 variability in surface waters 30 km off Monterey, California from April to May 1995. Sensors for pCO 2 and O 2 were deployed for 19 days on the manned research platform, R/P FLIP. The sensors were located at 5, 10 and 31 m depths. The 31 m sensors resided below or within the thermocline, and the 5 and 10 m sensors were within the surface mixed layer during the field study. The area was characterized by surface pCO 2 undersaturation and O 2 supersaturation during the entire period. The average pCO 2 levels at 5, 10, and 31 m, were 323±18, 326±19, and 452±63 μatm, respectively. Much of the short term variability was related to thermocline movement and advection of offshore and coastal upwelled waters around the site. Rates of gas exchange and primary production were determined during periods when advection did not appear to dominate the variability. Air-sea gas exchange models predict an observed decline in O 2 supersaturation. Rapid air-sea reequilibration of O 2 relative to pCO 2 appears to have a significant effect on the pCO 2 : O 2 relationship. Primary production estimates based on CO 2 and O 2 rates of change match well with shipboard 14C primary production.
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