Blum Joel D.

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Blum
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Joel D.
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  • Dataset
    Mercury stable isotope values for marine particles from R/V Kilo Moana cruises KM1418, KM1407 and KM1506 around station ALOHA in 2014 and 2015
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-02-24) Blum, Joel D. ; Benitez-Nelson, Claudia ; Drazen, Jeffrey C. ; Popp, Brian N. ; Seraphin, Kanesa
    This dataset contains the mercury stable isotope ratios collected in marine particles during R/V Kilo Moana cruises around Station ALOHA. These data were published in Motta et al., (2019) with supporting information. 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: https://www.bco-dmo.org/dataset/788753
  • Dataset
    Mercury stable isotope values for zooplankton collected during R/V Kilo Moana cruises KM1418 and KM1506 around Station ALOHA in 2014 and 2015
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-02-24) Blum, Joel D. ; Benitez-Nelson, Claudia ; Drazen, Jeffrey C. ; Popp, Brian N. ; Seraphin, Kanesa
    This dataset contains the mercury stable isotope ratios collected in zooplankton during R/V Kilo Moana cruises around Station ALOHA (22.75N, 158W). These data were published in Motta et al., (2019) with supporting information. 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: https://www.bco-dmo.org/dataset/788512
  • Dataset
    Mercury stable isotope ratios for standard reference material UM-Almaden during 2011-2013
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-10-20) Reinfelder, John ; Kritee, Kritee ; Blum, Joel D.
    Mercury stable isotope ratios for standard reference material UM-Almaden during 2011-2013. 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: https://www.bco-dmo.org/dataset/826746
  • Dataset
    Mercury stable isotope values for precipitation collected around Station ALOHA from 2005 to 2014
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-02-24) Blum, Joel D. ; Benitez-Nelson, Claudia ; Drazen, Jeffrey C. ; Popp, Brian N. ; Seraphin, Kanesa
    This dataset contains the mercury stable isotope ratios collected in precipitation during R/V Kilo Moana cruises around Station ALOHA. These data were published in Motta et al., (2019) with supporting information. 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: https://www.bco-dmo.org/dataset/788727
  • Dataset
    Hg(II) concentrations and stable isotope ratios for individual samples from mercury reduction experiments conducted on marine phytoplankton from 2011-2013
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-10-20) Reinfelder, John ; Kritee, Kritee ; Blum, Joel D.
    Hg(II) concentrations and stable isotope ratios for individual samples from mercury reduction experiments conducted on marine phytoplankton from 2011-2013. 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: https://www.bco-dmo.org/dataset/826662
  • Dataset
    Hg(II) photoreduction rates and stable isotope enrichment from mercury reduction experiments conducted on marine phytoplankton from 2011-2013
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-10-20) Reinfelder, John ; Kritee, Kritee ; Blum, Joel D.
    Hg(II) photoreduction rates and stable isotope enrichment from mercury reduction experiments conducted on marine phytoplankton from 2011-2013. 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: https://www.bco-dmo.org/dataset/826598
  • Dataset
    Reference materials analyzed in the laboratory for THg isotopic composition
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-02-24) Blum, Joel D. ; Benitez-Nelson, Claudia ; Drazen, Jeffrey C. ; Popp, Brian N. ; Seraphin, Kanesa
    This dataset contains the reference materials analyzed in the laboratory for THg isotopic composition. These data were published in Motta et al., (2019) with supporting information. 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: https://www.bco-dmo.org/dataset/788780
  • Dataset
    MeHg concentrations and stable isotope ratios for individual samples from mercury reduction experiments conducted on marine phytoplankton from 2012-2013
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-10-20) Reinfelder, John ; Kritee, Kritee ; Blum, Joel D.
    MeHg concentrations and stable isotope ratios for individual samples from mercury reduction experiments conducted on marine phytoplankton from 2012-2013. 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: https://www.bco-dmo.org/dataset/826724
  • Dataset
    MeHg photoreduction rates and stable isotope enrichment from mercury reduction experiments conducted on marine phytoplankton from 2012-2013.
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-10-20) Reinfelder, John ; Kritee, Kritee ; Blum, Joel D.
    MeHg photoreduction rates and stable isotope enrichment from mercury reduction experiments conducted on marine phytoplankton from 2012-2013. 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: https://www.bco-dmo.org/dataset/826633
  • Article
    Particulate mercury export in the Central Pacific Ocean using 234Th 238U disequilibria
    (Elsevier, 2024-07-24) Umhau, Blaire P. ; Motta, Laura C. ; Blum, Joel D. ; Close, Hilary G. ; Drazen, Jeffrey C. ; Popp, Brian N. ; Benitez-Nelson, Claudia R.
    Mercury (Hg) is a potent neurotoxin that enters the food web and may contaminate commercial, recreational, subsistence, and ceremonial fish stocks. Understanding the pathways by which this contamination occurs in marine systems is thus an essential component of minimizing consumer health risk. Our knowledge of the biogeochemical cycling of mercury, however, is relatively limited. Temporal changes in sinking particulate mercury (PHg) fluxes throughout the upper 400 m were examined at Station ALOHA (22°N, 158°W) in the North Pacific Subtropical Gyre (NPSG) and spatially along a north-south transect to the Equator (17.5°N to 5°N x 155°W) using a combination of in situ pumps and Uranium-238/Thorium-234 disequilibria as a tracer of particle export. Our results indicate that Station ALOHA is characterized by seasonally variable export fluxes of PHg, with highest fluxes occurring in May (175 m, 346 pmol m−2 day−1), with the advent of summer zooplankton growth, and in September (400 m, 356 pmol m−2 day−1), coinciding with a diazotroph mediated summer export pulse. PHg fluxes in May and September were higher than those previously measured in the equatorial Pacific at 150 m and continued to be high (> 100 pmol Hg m−2 d−1) down to 400 m, thereby providing a significant source of Hg to the mesopelagic food web. In contrast to Station ALOHA, at 8 and 5°N, PHg fluxes attenuated rapidly with depth, and fluxes were generally lower, with a maximum flux of 86 pmol m−2 d−1 (5°N). Depth profiles at 8 and 5°N were significantly different from one another, with PHg fluxes higher throughout the water column at 5°N and characterized by a subsurface peak in Hg flux 3 times higher than at 8°N (86 vs. 29 pmol Hg m−2 d−1). Monomethylmercury (MeHg) fluxes (max = 1.09 ± 0.57 pmol m−2 d−1) and concentrations (max = 0.14 fmol L−1) comprised only a small percentage of the total PHg pool. These results suggest that PHg cycling significantly differed between the NPSG and near the equator at least during an El Niño year. At Station ALOHA, microbial reworking of small particles below the deep chlorophyll maximum coupled with changes in zooplankton grazing drive seasonal export variability. In contrast near the equator, low fluxes associated with low biological productivity result in significantly lower PHg transport to depth during an El Niño year.