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Primary production estimates from recordings of solar-stimulated fluorescence in the equatorial Pacific at 150 deg WBiological, optical, and hydrographical data were collected on the WEC88 cruise along 150 deg W and during a 6-day time-series station on the equator during February/March 1988. This area was characterized by a subsurface chlorophyll maximum (SCM), located at 50-70 m depth at the equator and descending down to 120-125 m at the north and south end of the transect. Highest primary production rates were near-surface and confined to the equatorial region and stations between 7 deg and 11 deg N. To determine the relationship between solar-stimulated fluorescence (centered at 683 nm wavelength) and primary production, a production-fluorescence model based on phytoplankton physiology and marine optics is described. Results of model calculations predict that there is a linear relation between production and fluorescence. A comparison between morning and midday measurements of the production-fluorescence relation showed that there was some difference between the two, whereas evening measurements, on the other hand, were distinctly different from the morning/midday ones. This seems to suggest that diurnal variations contribute significantly to variability in the quantum yield of photochemical processes. The ratio of the quantum yield of photosynthesis to the quantum yield of fluorescence ranged between 0.24 and 0.44 molC/Ein for all stations. The highest value for this ratio occurred at the equatorial stations, indicating that latitudinal variability could have an effect on the production-fluorescence relation.
Document ID
19920038621
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Stegmann, P. M.
(Dalhousie Univ. Halifax Nova Scotia, Canada)
Lewis, M. R.
(Dalhousie University Halifax, Canada)
Davis, C. O.
(JPL Pasadena, CA, United States)
Cullen, J. J.
(Bigelow Laboratory for Ocean Sciences West Boothbay Harbor, ME, United States)
Date Acquired
August 15, 2013
Publication Date
January 15, 1992
Publication Information
Publication: Journal of Geophysical Research
Volume: 97
ISSN: 0148-0227
Subject Category
Oceanography
Accession Number
92A21245
Funding Number(s)
CONTRACT_GRANT: NAGW-2072
CONTRACT_GRANT: N00014-87-K-0311-01
Distribution Limits
Public
Copyright
Other

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