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• W2059636710 abstract "Springtime composites of surface chlorophyll a (chl) from the SeaWiFS instrument show a sharp increase in chl standing stock (from ∼0.1 to 0.3 mg m−3) occurring between 30° and 40°N in the eastern North Pacific Ocean. To investigate the spatial and interannual variability of this springtime feature, multi-platform surveys (23°–33°N, 158°W), including shipboard and satellite measurements, were conducted in April 1998 and 1999 to characterize the hydrographic conditions associated with the large chl gradient. Irradiance and chl data collected during the cruise periods were used in an optical model to compute depth-integrated rates of primary production. The southern portion of both transects resembled the climatological conditions at the Hawai'i Ocean Time-series (HOT) study site, Station ALOHA (22.75°N, 158°W), with two major physical and biological frontal features encountered: 1) the South Subtropical Front (SSTF) in 1998 at 27°–28°N and in 1999 at 32.5°N; and 2) the Subtropical Front (STF) in 1998 at 32°N, which in 1999 had migrated northward out of our study area to ∼34°N. Integrated chl and primary production both increased at the frontal locations in both years. Increases in surface chl from SeaWiFS and shipboard measurements were not apparent at the SSTF, yet the subsurface chl maximum both shallowed and doubled at this front. In addition, primary production modeled from the satellite chl data did not reflect the smaller mesoscale variability of the SSTF. The increase in surface chl at the STF, however, was clearly recorded in both the satellite and shipboard chl measurements. HPLC pigment analysis was performed for select samples collected during the 1998 cruise and revealed a change in phytoplankton composition at all frontal locations. Specifically, there were distinct increases in the dinoflagellate marker, peridinin, and the diatom marker, fucoxanthin, at the SSTF. The same patterns at the SSTF were observed during both cruises, except all gradients were shifted to the north, as a result of changes in the large-scale circulation of the gyre in 1999. While the eastern equatorial Pacific experienced a dramatic decrease in chl concentrations during El Niño events, the subtropical Pacific appeared to be more ‘green’ with a southward shift of the circulatory and high surface chl fronts." @default.
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• W2059636710 date "2001-01-01" @default.
• W2059636710 modified "2023-10-17" @default.
• W2059636710 title "Interannual mesoscale physical and biological variability in the North Pacific Central Gyre" @default.
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• W2059636710 doi "https://doi.org/10.1016/s0079-6611(01)00024-6" @default.
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