PIs*: Lohrenz, Steven
Start Time:2008-05-01 18:32:00
End Time:2009-07-04 12:04:45
Data Types: cast, pigment
Parameters: a abs abs_ad abs_ag abs_ap ad ag allo alpha-beta-car ap aph but-fuco chl_c1c2 chl_c3 chlide_a diadino diato dp dv_chl_a dv_chl_b fuco gyro hex-fuco hpl hpl_id lut mv_chl_a mv_chl_b neo perid phide_a phytin_a ppc ppc_tcar ppc_tpg pras psc psc_tcar psp psp_tpg tacc tacc_tchla tcar tchl tchl_tcar tchla_tpg tot_chl_a tot_chl_b tot_chl_c tpg viola volfilt zea
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Estuarine and coastal systems play important roles in society, serving as port facilities, productive fisheries and rookeries, and scenic recreational areas. However, these same values to society mean that these areas can be significantly affected by human activities. Inputs of nutrients, organic matter, and trace metals are among these impacts. The MagMix project seeks to understand the transport and cycling of nutrients and trace elements and relate that to biogeochemical and optical properties in river-dominated coastal systems. The area of study is the outflow region of the Mississippi and Atchafalaya rivers in the northern Gulf of Mexico. The Mississippi River carries high concentrations of plant nutrients derived from fertilizer use on farms in the heartland of the US. These excess nutrients stimulate plant growth in the surface waters of the Louisiana Shelf. These plants, in turn, sink to the bottom waters of the shelf where they serve as food for respiring organisms. The input of this excess food then stimulates an excess of respiration thereby depleting the shelf bottom waters of oxygen during the summer. These oxygen-depleted (or hypoxic) waters then become a dead zone avoided by animals. The overall goal of this research project is to better understand the mixing processes and their relationship to optical and biogeochemical properties as the waters of the Mississippi River and the Atchafalaya River enter the Gulf of Mexico.


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