Dellapenna Timothy M.

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Timothy M.

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  • Dataset
    Core data collected in the Brazos River Plume, TX during 2017-2018
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact:, 2021-03-11) Dellapenna, Timothy M. ; Churchill, James ; Wang, Zhaohui Aleck
    Core data collected in the Brazos River Plume, TX during three cruises conducted in 2017 and 2018. Cores were analyzed for grain size and mercury content. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at:
  • Article
    Particle triggered reactions as an important mechanism of alkalinity and inorganic carbon removal in river plumes
    (American Geophysical Union, 2021-05-20) Wurgaft, Eyal ; Wang, Zhaohui Aleck ; Churchill, James H. ; Dellapenna, Timothy M. ; Song, Shuzhen ; Du, Jiabi ; Ringham, Mallory C. ; Rivlin, Tanya ; Lazar, Boaz
    The effects of heterogeneous reactions between river-borne particles and the carbonate system were studied in the plumes of the Mississippi and Brazos rivers. Measurements within these plumes revealed significant removal of dissolved inorganic carbon (DIC) and total alkalinity (TA). After accounting for all known DIC and TA sinks and sources, heterogeneous reactions (i.e., heterogeneous CaCO3 precipitation and cation exchange between adsorbed and dissolved ions) were found to be responsible for a significant fraction of DIC and TA removal, exceeding 10% and 90%, respectively, in the Mississippi and Brazos plume waters. This finding was corroborated by laboratory experiments, in which the seeding of seawater with the riverine particles induced the removal of the DIC and TA. The combined results demonstrate that heterogeneous reactions may represent an important controlling mechanism of the seawater carbonate system in particle-rich coastal areas and may significantly impact the coastal carbon cycle.