Fall 2007 Update: Trends in Spring Conditions for the Gulf of Maine Subregion
The SST and chlorophyll data for the Gulf of Maine were partitioned into time period/seasonal indices following the scheme described in the Spring 2007 Ecosystem Advisory, see: http://www.nefsc.noaa.gov/omes/OMES/spring2007/adv6.html. The SST time series for the Gulf of Maine shows that the 2006 and 2007 values reverse the cooling trend of the past five years. The 2007 winter SST index was above the time series trend whereas the spring index approximated the trend. Winter chlorophyll intensity and magnitude remained at levels similar to those observed in 2006. Spring chlorophyll intensity in 2007 was at the time series trend level, but the 2007 spring bloom magnitude was well above the trend reflecting the highly variable bloom magnitudes seen in this subregion. The January-February zooplankton biomass estimate suggests a modest decrease in zooplankton during the winter of 2007. Zooplankton data from March-April and May-June 2007 is not yet available.