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- W4280593321 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> In late summer 2019 and 2020 bottom waters in southern Cape Cod Bay (CCB) became depleted of dissolved oxygen (DO), with documented benthic mortality in both years. Hypoxic conditions formed in relatively shallow water where the strong seasonal thermocline intersected the sea floor, both limiting vertical mixing and concentrating biological oxygen demand (BOD) over a very thin bottom boundary layer. In both 2019 and 2020, anomalously high sub-surface phytoplankton blooms were observed, and the biomass from these blooms provided the fuel to deplete sub-pycnocline waters of DO. The increased chlorophyll fluorescence was accompanied by a corresponding decrease in sub-pycnocline nutrients, suggesting that prior to 2019 physical conditions were unfavorable for the utilization of these deep nutrients by the late-summer phytoplankton community. It is hypothesized that significant alteration of physical conditions in CCB during late summer, which is the result of regional climate change, has favored the recent increase in sub-surface phytoplankton production. These changes include rapidly warming waters and significant shifts in summer wind direction, both of which impact the intensity and vertical distribution of thermal stratification and vertical mixing within the water column. These changes in water column structure are not only more susceptible to hypoxia but also have significant implications for phytoplankton dynamics, potentially allowing for intense late-summer blooms of <i>Karenia mikimotoi</i>, a species new to the area. <i>K. mikimotoi</i> had not been detected in CCB or adjacent waters prior to 2017; however, increasing cell densities have been reported in subsequent years, consistent with a rapidly changing ecosystem." @default.
- W4280593321 created "2022-05-22" @default.
- W4280593321 creator A5019739503 @default.
- W4280593321 date "2022-05-10" @default.
- W4280593321 modified "2023-09-25" @default.
- W4280593321 title "Reply on RC2" @default.
- W4280593321 doi "https://doi.org/10.5194/bg-2022-48-ac2" @default.
- W4280593321 hasPublicationYear "2022" @default.
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