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Temporal and Spatial Variability of Physical and Bio-optical Properties on the New York Bight Inner Continental Shelf G. C. Chang , T. D. Dickey Ocean Physics Laboratory/University of California at Santa Barbara 6487 Calle Real Suite A, Santa Barbara, CA 93117, U.S.A. grace.chang@opl.ucsb.edu
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Temporal and Spatial Variability of Physical and Bio-optical Properties on the New York Bight Inner Continental Shelf G. C. Chang, T. D. Dickey Ocean Physics Laboratory/University of California at Santa Barbara 6487 Calle Real Suite A, Santa Barbara, CA 93117, U.S.A. grace.chang@opl.ucsb.edu O. M. Schofield and S. M. Glenn Institute of Marine and Coastal Sciences, Rutgers University A. D. Weidemann Naval Research Laboratory, Stennis Space Center
Outline • Introduction • Objectives • Importance • Methods • Study Site • Instrumentation • Results • Circulation and Hydrography • Optics and Biology • Coastal Jet • Water Mass/Turbidity Front • Spatial Patchiness • Internal Solitary Waves • Discussion and Summary
Objectives • Determine relationships between optical properties and physical, biological, geological, and chemical processes • Understanding of the diverse processes controlling inherent optical properties (IOPs) • Understanding of water column visibility • Develop operational ocean color algorithms and radiative transfer models
Importance • Nearly 50% of the world’s population lives within 1 km of the coastal ocean and anthropogenic effects of population expansion on the coastal ocean are poorly understood. • Interpretation of remote sensing data in the coastal ocean • Improve interdisciplinary models to quantify the global carbon budget
Mid-shelf Mooring Nearshore Node 11m: ac-9. PAR, Transmissometer, Fluorometer, Microcat, Tidbit Mid-shelf Tripod ADCP Study Site / Instrumentation
July 26 July 26 Optics and Biology Mooring Turnaround
Discussion • Adaptive sampling using satellite images coupled with real-time in-water data and forecast models. • Satellite images and medium- to long-range CODAR surface currents supply a synoptic view of processes with horizontal scales of tens of meters to tens of kilometers. • High temporal frequency instrumentation at several locations for resolving tides, internal solitary and surface waves, turbulence, sediment resuspension, MLD dynamics, water mass movements, changes in nutrients, phytoplankton light adaptation, etc. • Towed, profiling packages, AUVs, floats, and gliders provide high spatial resolution data for studies of advection, upwelling, river and estuarine flows, frontal dynamics, and water mass intrusions.
Summary • A relatively fast, southward moving, low temperature, high salinity, low particulate coastal jet • A distinct front separated the lower salinity, more turbid waters nearshore from more saline, relatively clearer waters at mid-shelf • Absorption at the mid-shelf location was dominated by phytoplankton and CDOM while nearshore absorption was mainly influenced by particulate material as compared to CDOM. • The interaction of tidal currents with the mean currents and the water mass/turbidity front was important for the formation of small-scale convergence and divergence zones. • Internal solitary waves were observed at 20 m water depth at the mooring site. • Insight in nearshore coastal processes and their effects on biology as well as for the design of future nearshore interdisciplinary coastal programs.
