Insights on the vertical phytoplankton distribution off Northeastern Luzon, Philippines : comparing fluorometer and spectrophotometer data
Abstract
Most primary productivity models use chlorophyll-a (Chl-a) as this is a well-accepted proxy for phytoplankton biomass. In the field, fluorometers provide rapid assessment in determining the vertical distribution of chl-a. The fluorescence data is generally calibrated with actual Chl-a measurements to accurately assess the primary productivity of a system. In this study, fluorescence profiles obtained during the Shelf-Pacific Interaction in Luzon (SPIL) 2011 and 2012 cruises off the Northeastern Luzon are initially parameterized using the shifted Gaussian function. Relationships between these parameters and corresponding in-situ Chl-a data are established and then used to rectify the fluorescence profiles into a 'true' Chl-a concentration profile. This study also attempts to correct for daytime fluorescence quenching for a more precise estimation of primary production within Philippine waters.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2013
- Bibcode:
- 2013AGUFMOS43B1898C
- Keywords:
-
- 4264 OCEANOGRAPHY: GENERAL Ocean optics