Bullock Emma J.

No Thumbnail Available
Last Name
Bullock
First Name
Emma J.
ORCID

Search Results

Now showing 1 - 3 of 3
  • Dataset
    Desorbed Radium from Kolyma (Russia), Ellice (Canada), and Kodiak Island (USA) Rivers
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2022-08-17) Charette, Matthew A. ; Bullock, Emma J.
    This dataset reports concentrations of desorbed Radium from Kolyma (Russia), Ellice (Canada), and Kodiak Island (USA) Rivers from sediment samples collected from July 2018 to September 2019. 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/878663
  • Article
    Radium inputs into the Arctic Ocean from rivers a basin‐wide estimate
    (American Geophysical Union, 2022-09-08) Bullock, Emma J. ; Kipp, Lauren ; Moore, Willard S. ; Brown, Kristina A. ; Mann, Paul J. ; Vonk, Jorien E. ; Zimov, Nikita S. ; Charette, Matthew A.
    Radium isotopes have been used to trace nutrient, carbon, and trace metal fluxes inputs from ocean margins. However, these approaches require a full accounting of radium sources to the coastal ocean including rivers. Here, we aim to quantify river radium inputs into the Arctic Ocean for the first time for 226Ra and to refine the estimates for 228Ra. Using new and existing data, we find that the estimated combined (dissolved plus desorbed) annual 226Ra and 228Ra fluxes to the Arctic Ocean are [7.0–9.4] × 1014 dpm y−1 and [15–18] × 1014 dpm y−1, respectively. Of these totals, 44% and 60% of the river 226Ra and 228Ra, respectively are from suspended sediment desorption, which were estimated from laboratory incubation experiments. Using Ra isotope data from 20 major rivers around the world, we derived global annual 226Ra and 228Ra fluxes of [7.4–17] × 1015 and [15–27] × 1015 dpm y−1, respectively. As climate change spurs rapid Arctic warming, hydrological cycles are intensifying and coastal ice cover and permafrost are diminishing. These river radium inputs to the Arctic Ocean will serve as a valuable baseline as we attempt to understand the changes that warming temperatures are having on fluxes of biogeochemically important elements to the Arctic coastal zone.
  • Dataset
    Dissolved Radium from Kolyma (Russia), Ellice (Canada), and Kodiak Island (USA) Rivers
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2022-08-17) Charette, Matthew A. ; Bullock, Emma J.
    This dataset reports concentrations of dissolved Radium from Kolyma (Russia), Ellice (Canada), and Kodiak Island (USA) Rivers from samples collected from June to September 2019. 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/878527