We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Variation of the photosynthetic electron transfer rate and electron requirement for daily net carbon fixation in Ariake Bay, Japan.
- Authors
Zhu, Y.; Ishizaka, J.; Tripathy, S.; Wang, S.; Mino, Y.; Matsuno, T.; Suggett, D.
- Abstract
Fast repetition rate fluorometry (FRRf) provides a potential means to examine marine primary productivity; however, FRRf-based productivity estimations require knowledge of the electron requirement ( K) for carbon (C) uptake ( K ) to scale an electron transfer rate (ETR) to the CO uptake rate. Most previous studies have derived K from parallel measurements of ETR and CO uptake over relatively short incubations, with few from longer-term daily-integrated periods. Here we determined K by comparing depth-specific, daily ETRs and CO-uptake rates obtained from 24-h on-deck incubation experiments undertaken on seven cruises in Ariake Bay, Japan, from 2008 to 2010. The purpose of this study was to determine the extent of variability of K and to what extent this variability could be reconciled with the prevailing environmental conditions and ultimately to develop a method for determining net primary productivity (NPP) based on FRRf measurements. Both daily ETR and K of the upper layer varied considerably, from 0.5 to 115.7 mmol e mg Chl- a day and 4.1-26.6 mol e (mol C), respectively, throughout the entire data set. Multivariate analysis revealed a strong correlation between daily photosynthetically active radiation (PAR) and K ( r = 0.94). A simple PAR-dependent relationship derived from the data set was used for generating K , and this relationship was validated by comparing the FRRf-predicted NPP with the C uptake measured in 2007. These new observations demonstrate the potential application of FRRf for estimating regional NPP from ETR.
- Subjects
ARIAKE Bay (Japan); CHARGE exchange; CARBON fixation; FLUORIMETRY; PRIMARY productivity (Biology)
- Publication
Journal of Oceanography, 2016, Vol 72, Issue 5, p761
- ISSN
0916-8370
- Publication type
Article
- DOI
10.1007/s10872-016-0370-4