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Heterogeneous reservoirs in the marine carbon cycle
(Massachusetts Institute of Technology, 2014)
Understanding the fate of primary production in the ocean is a challenging task because once produced, organic material is oxidized over timescales which range from minutes, to millions of years. This timescale diversity ...
Inferring ocean circulation during the last glacial maximum and last deglaciation using data and models
(Massachusetts Institute of Technology, 2017-02-22)
Since the Last Glacial Maximum (LGM, ~ 20,000 years ago) air temperatures warmed, sea level rose roughly 130 meters, and atmospheric concentrations of carbon dioxide increased. This thesis combines global models and ...
Molecular determination of marine iron ligands by mass spectrometry
(Massachusetts Institute of Technology, 2016)
Marine microbes produce a wide variety of metal binding organic ligands that regulate the solubility and availability of biologically important metals such as iron, copper, cobalt, and zinc. In marine environments where ...
Transformations of mercury in the marine water column
(Massachusetts Institute of Technology, 2014)
Methylation of mercury (Hg) in the marine water column has been hypothesized to serve as the primary source of the bioaccumulating chemical species monomethylmercury (MMHg) to marine food webs. Despite decades of research ...
The remineralization of marine organic matter by diverse biological and abiotic processes
(Massachusetts Institute of Technology, 2017)
While aerobic respiration is typically invoked as the dominant mass-balance sink for organic matter in the upper ocean, many other biological and abiotic processes can degrade particulate and dissolved substrates on globally ...
Age of air and the circulation of the stratosphere
(Massachusetts Institute of Technology, 2017)
The circulation of air in the stratosphere is important for the distribution of radiatively-important trace gases, such as ozone and water vapor, and other chemical species, including ozone-depleting chlorofluorocarbons. ...