New chemical, bio-optical and physical observations of upper ocean response to the passage of a mesoscale eddy off Bermuda

摘要: A mesoscale eddy advected across the Bermuda Testbed Mooring site over a 30-day period centered on July 14, 1995. Temperature and current measurements along with biogeochemical were used to characterize biological response of upper ocean associated introduction nitrate into euphotic layer due doming isotherms eddy. Complementary shipboard data showed an anomalous water mass, which extended from depth ;50 1000 m, manifesting as cold surface expression warm anomaly at depth. Although eddies are frequently observed in Sargasso Sea, present observations particularly unique because high-temporal-resolution new instrumentation deployed mooring. Analyzers that measure plus nitrite placed depths 80 200 m bio-optical sensors located 20, 35, 45, 71, 86 m. Peak values nearly 3.0 mM chlorophyll 1.4 mg 23 71 observed, well 25- 30-meter shoaling 1% light level Doppler shift inertial (22.8 hours) 25.2 hours was several time series records movement Inertial pumping brought cold, nutrient-rich waters farther zone than would occur solely by isothermal lifting. Silicic acid depleted undetectable levels owing growth diatoms within The appear be largest recorded during 8 years ongoing U.S. JGOFS Atlantic Time Series Study (BATS) program.