Drazen Jeffrey C.

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Drazen
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Jeffrey C.
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  • Dataset
    Sample log for HADESK bacterial biomarker phospholipid fatty acid content from sediment cores collected on R/V Thomas G. Thompson cruise TN309, May 2014
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2019-06-17) Shank, Timothy M. ; Drazen, Jeffrey C. ; Yancey, Paul
    This dataset contains the sample log for HADESK bacterial biomarker phospholipid fatty acid (PLFA) content from sediment push cores. The same samples were also used for the organic matter (OM) analysis. Samples were taken in the Kermadec Trench in the Southwest Pacific, 4000 to ~10,000m from the RV/ Thomas G. Thompson during cruise TN309, May 2014. 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/763873
  • 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
    Amino acid compound-specific isotope analysis (AA-CSIA) of tissue samples from four distinct trophic groups across the food web in the pelagic eastern tropical Pacific Ocean; samples collected on NOAA cruises from July to December 2006
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2019-08-05) Olson, Robert ; Popp, Brian N. ; Drazen, Jeffrey C.
    Amino acid compound-specific isotope analysis (AA-CSIA) of tissue samples from four distinct trophic groups across the food web in the pelagic eastern tropical Pacific Ocean; samples collected on NOAA cruises from July to December 2006. 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/679447
  • 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
    Amino acid compound specific isotope analyses of abyssal deposit feeders, gut contents, and surrounding surface sediments collected on R/V Atlantis cruise AT42-10 and R/V Western Flyer Pulse 72 in the eastern North Pacific in 2019
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2021-06-03) Drazen, Jeffrey C. ; Popp, Brian N. ; Romero, Sonia
    Abyssal ecosystems depend on the quantity and quality of organic material reaching the deep-sea floor. During R/V Atlantis cruise (AT42-10) in May 2019 and R/V Western Flyer cruise (Pulse 72) in October 2019, samples from deep-sea benthic communities were collected in the eastern North Pacific Ocean. Station M was visited to investigate how surface ocean processes are coupled to food-webs at the deep ocean seafloor and to understand the sources of nutrition to the deep-sea benthos. This dataset presents compound specific stable isotope analyses of amino acids (AA-CSIA) of abyssal deposit feeders, their gut contents, and the surrounding sediments. 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/840749
  • 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
    Particles and Zooplankton Amino Acid Compound Specific Isotope Analyses (AA-CSIA) and zooplankton biomass at Station ALOHA and the Equatorial Pacific from R/V Kilo Moana cruises KM1407, KM1418, & KM1515 from 2014-2015
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-03-31) Popp, Brian N. ; Drazen, Jeffrey C.
    Particles and Zooplankton Amino Acid Compound Specific Isotope Analyses (AA-CSIA) and zooplankton biomass at Station ALOHA and the Equatorial Pacific from R/V Kilo Moana cruises KM1407, KM1418, & KM1515 from 2014-2015. 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/806502
  • Dataset
    Raw counts of meiofauna identified in sediment samples from the Kermadec Trench in the Southwest Pacific, 4000 to ~10,000m from the RV/ Thomas G. Thompson during cruise TN309 (HADES-K), May 2014.
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2019-06-17) Shank, Timothy M. ; Drazen, Jeffrey C. ; Yancey, Paul
    This dataset includes raw counts of meiofauna identified in push core samples taken in the Kermadec Trench in the Southwest Pacific, 4000 to ~10,000m from the RV/ Thomas G. Thompson during cruise TN309 (HADES-K), May 2014. 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/763758
  • Dataset
    Amino acid compound specific isotope values for particles from R/V Kilo Moana KM1407 and KM1418 in the Central North Pacific, Station ALOHA, Tropical Pacific, Feb and Sept. 2014
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2019-03-18) Popp, Brian N. ; Benitez-Nelson, Claudia ; Blum, Joel ; Drazen, Jeffrey C. ; Hannides, Cecelia ; Seraphin, Kanesa
    This dataset contains amino acid compound specific nitrogen isotope ratios in particles collected during R/V Kilo Moana cruises around Station ALOHA (KM1407 and KM1418). For more information about the ALOHA observatory see: http://aco-ssds.soest.hawaii.edu/. These data were published in Gloeckler et al (2018), Supporting Information file lno10762-sup-0002-suppinfo2.xlsx 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/751313
  • Dataset
    234Th flux in epipelagic waters at Station ALOHA and the Equatorial Pacific from R/V Kilo Moana cruises KM1407, KM1418, & KM1515 during 2014-2015
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-03-31) Benitez-Nelson, Claudia R. ; Drazen, Jeffrey C. ; Popp, Brian N.
    234Th flux in epipelagic waters at Station ALOHA and the Equatorial Pacific from R/V Kilo Moana cruises KM1407, KM1418, & KM1515 during 2014-2015. 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/806471
  • 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
    Raw counts of macrofauna identified in sediment samples from the Kermadec Trench in the Southwest Pacific, 4000 to ~10,000m from the RV/ Thomas G. Thompson during cruise TN309 (HADES-K), May 2014.
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2019-06-17) Shank, Timothy M. ; Drazen, Jeffrey C. ; Yancey, Paul
    This dataset includes raw counts of macrofauna families identified in push core samples taken in the Kermadec Trench in the Southwest Pacific, 4000 to ~10,000m from the RV/ Thomas G. Thompson during cruise TN309 (HADES-K), May 2014. 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/763694
  • Dataset
    Bulk isotopic composition (d15N and d13C) of abyssal megafauna and macrofauna from Stations M and Aloha
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2022-01-12) Drazen, Jeffrey C. ; Popp, Brian N. ; Smith, Craig R.
    This dataset includes bulk isotopic composition (d15N and d13C) of abyssal megafauna and macrofauna from Station M and Station Aloha. Macrofauna and megafauna were collected in May and October 2019 using the HOV Alvin and the ROV Doc Ricketts, respectively, at Station M and in July 2019, January 2020, and July 2020 using ROV Lu'ukai at Station Aloha. Macrofauna at Station M were collected using HOV-operated Ekman cores (20x20 cm). 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/866774
  • Article
    The distribution of benthic biomass in hadal trenches : a modelling approach to investigate the effect of vertical and lateral organic matter transport to the seafloor
    (Elsevier, 2015-02-19) Ichino, Matteo C. ; Clark, Malcolm R. ; Drazen, Jeffrey C. ; Jamieson, Alan ; Jones, Daniel O. B. ; Martin, Adrian P. ; Rowden, Ashley A. ; Shank, Timothy M. ; Yancey, Paul H. ; Ruhl, Henry A.
    Most of our knowledge about deep-sea habitats is limited to bathyal (200–3000 m) and abyssal depths (3000–6000 m), while relatively little is known about the hadal zone (6000–11,000 m). The basic paradigm for the distribution of deep seafloor biomass suggests that the reduction in biomass and average body size of benthic animals along depth gradients is mainly related to surface productivity and remineralisation of sinking particulate organic carbon with depth. However, there is evidence that this pattern is somewhat reversed in hadal trenches by the funnelling of organic sediments, which would result in increased food availability along the axis of the trenches and towards their deeper regions. Therefore, despite the extreme hydrostatic pressure and remoteness from the pelagic food supply, it is hypothesized that biomass can increase with depth in hadal trenches. We developed a numerical model of gravitational lateral sediment transport along the seafloor as a function of slope, using the Kermadec Trench, near New Zealand, as a test environment. We propose that local topography (at a scale of tens of kilometres) and trench shape can be used to provide useful estimates of local accumulation of food and, therefore, patterns of benthic biomass. Orientation and steepness of local slopes are the drivers of organic sediment accumulation in the model, which result in higher biomass along the axis of the trench, especially in the deepest spots, and lower biomass on the slopes, from which most sediment is removed. The model outputs for the Kermadec Trench are in agreement with observations suggesting the occurrence of a funnelling effect and substantial spatial variability in biomass inside a trench. Further trench surveys will be needed to determine the degree to which seafloor currents are important compared with the gravity-driven transport modelled here. These outputs can also benefit future hadal investigations by highlighting areas of potential biological interest, on which to focus sampling effort. Comprehensive exploration of hadal trenches will, in turn, provide datasets for improving the model parameters and increasing predictive power.
  • Dataset
    Bulk raw isotopic data from tissue samples from non-tuna species collected in the eastern tropical Pacific Ocean onboard two NOAA research ships, David Starr Jordan and McArthur II, (cruises SWFSC1630 and SWFSC1631) in 2006
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-01-21) Olson, Robert ; Popp, Brian N. ; Drazen, Jeffrey C.
    Bulk raw isotopic data from tissue samples from two species of ommastrephid cephalopods (squids), two species of mesopelagic myctophid fishes, and two species of euphausiid crustaceans collected in the eastern tropical Pacific Ocean onboard two NOAA research ships. 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/675211
  • Dataset
    Nereus dive geo-referenced megafaunal transect data from the Kermadec Trench during cruise TN309 on RV/Thompson, May 2014
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2019-06-17) Shank, Timothy M. ; Drazen, Jeffrey C. ; Yancey, Paul
    Nereus dive geo-referenced megafaunal transect data from the Kermadec Trench during cruise TN309 on RV/Thompson, May 2014. 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/765656
  • Dataset
    Amino acid compound specific isotope values for micronekton from R/V Kilo Moana KM1109, KM1123, KM1407, KM1418, and other cruises in the Central North Pacific, Station ALOHA, Tropical Pacific, 2007-2014
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2019-03-18) Popp, Brian N. ; Benitez-Nelson, Claudia ; Blum, Joel ; Drazen, Jeffrey C. ; Hannides, Cecelia ; Seraphin, Kanesa
    This dataset contains amino acid compound specific concentrations in micronekton collected during R/V Kilo Moana cruises around the ALOHA observatory (KM1407, KM1418, KM2011, and a few other undocumented cruises). For more information about the ALOHA observatory see: http://aco-ssds.soest.hawaii.edu/. These data were published in Gloeckler et al (2018), Supporting Information file lno10762-sup-0001-suppinfo1.xlsx 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/750972
  • Dataset
    Bulk raw isotopic data from tissue samples from three species of tunas collected in the eastern tropical Pacific Ocean onboard commercial tuna purse-seine vessels from 2003-2005
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-01-21) Olson, Robert ; Popp, Brian N. ; Drazen, Jeffrey C.
    Bulk raw isotopic data from tissue samples from three species of tunas collected in the eastern tropical Pacific Ocean onboard commercial tuna purse-seine vessels. 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/675055
  • 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.