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JPR Advance Access published online on November 29, 2007
Journal of Plankton Research, doi:10.1093/plankt/fbm097
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© The Author 2007. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Space-time variability of carbon standing stocks and fixation rates in the Gulf of Maine, along the GNATS transect between Portland, Maine, USA, and Yarmouth, Nova Scotia, Canada.

William M. Balch1,*, David T. Drapeau1, Bruce C. Bowler1, Emily S. Booth1, Laura A. Windecker2 and Amanda Ashe3

1 Bigelow Laboratory for Ocean Sciences POB 475 W. Boothbay Harbor, Maine, USA 04575 2 Graduate School of Oceanography University of Rhode Island Box 200, South Ferry Road Narragansett, RI 02882 3 Oregon State University 104 Ocean Admin Building Corvallis, OR 97331-5503

* To whom correspondance should be addressed (bbalch{at}bigelow.org)

Received on August 9, 2007; revised on November 13, 2007; accepted on November 19, 2007


  Abstract

The Gulf of Maine North Atlantic Time Series (GNATS) has been run since 1998 and is the longest transect time series in the Gulf of Maine (GoM), U.S.A. Here we use this coastal time series to document the space-time variability in of hydrography, nutrients, phytoplankton standing stocks and carbon fixation in the GoM, in response to several years of extreme river discharge. We hypothesize that, during wet years, fresh water input capped the surface euphotic layer, impeding the upward diffusion of nutrients, thus lowering the phytoplankton biomass and carbon fixation rates. Regional algorithms were derived to estimate particulate organic carbon and carbon fixation. The Howard-Yoder algorithm was implemented to predict integral primary production using satellite ocean color data. Calcification was significantly correlated to primary production, thus allowing regional, satellite-derived calcification estimates. Total GoM and Georges Bank phytoplankton photosynthesis was 38.12 Tg C y–1 and total calcification was 0.55 Tg C y–1, yielding an overall ratio of calcification to photosynthesis of 1.44%. Carbon fixation in GoM coastal water (<60m bottom depth), GoM deep water (>60m) and Georges Bank waters (<60m) averaged 56%, 33%, and 11 % of the total primary production of the combined GoM and Georges Bank study area, respectively and 67%, 22%, and 11 % of the total calcification of the study area, respectively.

Key Words: primary production • calcification • time series • Gulf of Maine • satellite ocean color

Communicating Editor: K. J. Flynn


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