TY - JOUR
T1 - Short-term pCO2 and O2 dynamics in California coastal waters
AU - DeGrandpre, M. D.
AU - Hammar, T. R.
AU - Wirick, C. D.
N1 - Funding Information:
This work was supported by the NSF Coastal Ocean Processes (CoOP) program (Grant OCE-9410914).
PY - 1998/8
Y1 - 1998/8
N2 - We studied short-term pCO2 and O2 variability in surface waters 30 km off Monterey, California from April to May 1995. Sensors for pCO2 and O2 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 pCO2 undersaturation and O2 supersaturation during the entire period. The average pCO2 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 O2 supersaturation. Rapid air-sea reequilibration of O2 relative to pCO2 appears to have a significant effect on the pCO2:O2 relationship. Primary production estimates based on CO2 and O2 rates of change match well with shipboard 14C primary production.
AB - We studied short-term pCO2 and O2 variability in surface waters 30 km off Monterey, California from April to May 1995. Sensors for pCO2 and O2 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 pCO2 undersaturation and O2 supersaturation during the entire period. The average pCO2 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 O2 supersaturation. Rapid air-sea reequilibration of O2 relative to pCO2 appears to have a significant effect on the pCO2:O2 relationship. Primary production estimates based on CO2 and O2 rates of change match well with shipboard 14C primary production.
UR - http://www.scopus.com/inward/record.url?scp=0032143192&partnerID=8YFLogxK
U2 - 10.1016/S0967-0645(98)80006-4
DO - 10.1016/S0967-0645(98)80006-4
M3 - Article
AN - SCOPUS:0032143192
SN - 0967-0645
VL - 45
SP - 1557
EP - 1575
JO - Deep-Sea Research Part II: Topical Studies in Oceanography
JF - Deep-Sea Research Part II: Topical Studies in Oceanography
IS - 8-9
ER -