Lomas Michael W.

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Lomas
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Michael W.
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Now showing 1 - 20 of 33
  • Article
    Biogeochemical responses to late-winter storms in the Sargasso Sea, I - Pulses of primary and new production
    (Elsevier B.V., 2008-09-17) Lomas, Michael W. ; Lipschultz, Fredric ; Nelson, David M. ; Krause, Jeffrey W. ; Bates, Nicholas R.
  • Preprint
    An introduction and overview of the Bering Sea Project : volume IV
    ( 2016-08-18) Van Pelt, Thomas I. ; Napp, Jeffrey M. ; Ashjian, Carin J. ; Harvey, H. Rodger ; Lomas, Michael W. ; Sigler, Michael F. ; Stabeno, Phyllis J.
    The seasonal rhythm of sea-ice advance and retreat in the eastern Bering Sea (EBS) moves ice hundreds of kilometers across the broad continental shelf and exerts a powerful influence on the ecology of these waters. In winter, the combination of latitude, geology, winds, and ocean currents produces ice cover extending far into the southern Bering Sea. In the spring and summer, retreating ice, longer daylight hours, and nutrient-rich ocean water result in exceptionally high marine production, vital to both sea life and people. The intense burst of spring production, together with more episodic summer and early fall production, provides the energy that powers the complex food web and ultimately sustains nearly half of the US annual commercial fish landings, as well as providing food and cultural value to thousands of Bering Sea coastal and island residents.
  • Article
    Sargasso Sea phosphorus biogeochemistry : an important role for dissolved organic phosphorus (DOP)
    (Copernicus Publications on behalf of the European Geosciences Union, 2010-02-19) Lomas, Michael W. ; Burke, A. L. ; Lomas, D. A. ; Bell, D. W. ; Shen, C. ; Dyhrman, Sonya T. ; Ammerman, James W.
    Inorganic phosphorus (SRP) concentrations in the subtropical North Atlantic are some of the lowest in the global ocean and have been hypothesized to constrain primary production. Based upon data from several transect cruises in this region, it has been hypothesized that dissolved organic phosphorus (DOP) supports a significant fraction of primary production in the subtropical North Atlantic. In this study, a time-series of phosphorus biogeochemistry is presented for the Bermuda Atlantic Time-series Study site, including rates of phosphorus export. Most parameters have a seasonal pattern, although year-over-year variability in the seasonal pattern is substantial, likely due to differences in external forcing. Suspended particulate phosphorus exhibits a seasonal maximum during the spring bloom, despite the absence of a seasonal peak in SRP. However, DOP concentrations are at an annual maximum prior to the winter/spring bloom and decline over the course of the spring bloom while whole community alkaline phosphatase activities are highest. As a result of DOP bioavailability, the growth of particles during the spring bloom occurs in Redfield proportions, though particles exported from the euphotic zone show rapid and significant remineralization of phosphorus within the first 50 m below the euphotic zone. Based upon DOP data from transect cruises in this region, the southward cross gyral flux of DOP is estimated to support ~25% of annual primary production and ~100% of phosphorus export. These estimates are consistent with other research in the subtropical North Atlantic and reinforce the hypothesis that while the subtropics may be phosphorus stressed (a physiological response to low inorganic phosphorus), utilization of the DOP pool allows production and accumulation of microbial biomass at Redfield proportions.
  • Article
    Spring plankton dynamics in the Eastern Bering Sea, 1971–2050 : mechanisms of interannual variability diagnosed with a numerical model
    (John Wiley & Sons, 2016-02-20) Banas, Neil S. ; Zhang, Jinlun ; Campbell, Robert G. ; Sambrotto, Raymond N. ; Lomas, Michael W. ; Sherr, Evelyn B. ; Sherr, Barry F. ; Ashjian, Carin J. ; Stoecker, Diane K. ; Lessard, Evelyn J.
    A new planktonic ecosystem model was constructed for the Eastern Bering Sea based on observations from the 2007–2010 BEST/BSIERP (Bering Ecosystem Study/Bering Sea Integrated Ecosystem Research Program) field program. When run with forcing from a data-assimilative ice-ocean hindcast of 1971–2012, the model performs well against observations of spring bloom time evolution (phytoplankton and microzooplankton biomass, growth and grazing rates, and ratios among new, regenerated, and export production). On the southern middle shelf (57°N, station M2), the model replicates the generally inverse relationship between ice-retreat timing and spring bloom timing known from observations, and the simpler direct relationship between the two that has been observed on the northern middle shelf (62°N, station M8). The relationship between simulated mean primary production and mean temperature in spring (15 February to 15 July) is generally positive, although this was found to be an indirect relationship which does not continue to apply across a future projection of temperature and ice cover in the 2040s. At M2, the leading direct controls on total spring primary production are found to be advective and turbulent nutrient supply, suggesting that mesoscale, wind-driven processes—advective transport and storminess—may be crucial to long-term trends in spring primary production in the southeastern Bering Sea, with temperature and ice cover playing only indirect roles. Sensitivity experiments suggest that direct dependence of planktonic growth and metabolic rates on temperature is less significant overall than the other drivers correlated with temperature described above.
  • Article
    Phytoplankton responses to atmospheric metal deposition in the coastal and open-ocean Sargasso Sea
    (Frontiers Media, 2012-10-12) Mackey, Katherine R. M. ; Buck, Kristen N. ; Casey, John R. ; Cid, Abigail ; Lomas, Michael W. ; Sohrin, Yoshiki ; Paytan, Adina
    This study investigated the impact of atmospheric metal deposition on natural phytoplankton communities at open-ocean and coastal sites in the Sargasso Sea during the spring bloom. Locally collected aerosols with different metal contents were added to natural phytoplankton assemblages from each site, and changes in nitrate, dissolved metal concentration, and phytoplankton abundance and carbon content were monitored. Addition of aerosol doubled the concentrations of cadmium (Cd), cobalt (Co), copper (Cu), iron (Fe), manganese (Mn), and nickel (Ni) in the incubation water. Over the 3-day experiments, greater drawdown of dissolved metals occurred in the open ocean water, whereas little metal drawdown occurred in the coastal water. Two populations of picoeukaryotic algae and Synechococcus grew in response to aerosol additions in both experiments. Particulate organic carbon increased and was most sensitive to changes in picoeukaryote abundance. Phytoplankton community composition differed depending on the chemistry of the aerosol added. Enrichment with aerosol that had higher metal content led to a 10-fold increase in Synechococcus abundance in the oceanic experiment but not in the coastal experiment. Enrichment of aerosol-derived Co, Mn, and Ni were particularly enhanced in the oceanic experiment, suggesting the Synechococcus population may have been fertilized by these aerosol metals. Cu-binding ligand concentrations were in excess of dissolved Cu in both experiments, and increased with aerosol additions. Bioavailable free hydrated Cu2+ concentrations were below toxicity thresholds throughout both experiments. These experiments show (1) atmospheric deposition contributes biologically important metals to seawater, (2) these metals are consumed over time scales commensurate with cell growth, and (3) growth responses can differ between distinct Synechococcus or eukaryotic algal populations despite their relatively close geographic proximity and taxonomic similarity.
  • Dataset
    Cell abundance, growth rate, cellular P quotas, and alkaline phosphatase activity from a laboratory experiment examining the response of three species of marine phytoplankton grown under different phosphorus (P) conditions
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-09-02) Whitney, LeAnn P. ; Lomas, Michael W.
    A laboratory experiment was carried out to characterize the growth and physiological response of three species of eukaryotic phytoplankton grown with inorganic phosphate and phosphonate as the sole sources of phosphorus (P). Data reported are cell abundance, growth rate, cellular P quotas, and alkaline phosphatase activity. 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/820902
  • Dataset
    Sediment trap flux collected from R/V Atlantic Explorer cruises AE1102, AE1118, AE1206, AE1219 in the Sargasso Sea, Bermuda Atlantic Time-Series Station from 2011-2012 (Trophic BATS project)
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2019-11-06) Lomas, Michael W.
    Sediment trap flux collected from R/V Atlantic Explorer cruises AE1102, AE1118, AE1206, AE1219 in the Sargasso Sea, Bermuda Atlantic Time-Series Station from 2011-2012. 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/3935
  • Dataset
    Particulate organic matter (PON, POC, POP) concentrations collected on R/V Roger Revelle cruise RR1604 along the hydrographic line IO9 in the Eastern Indian Ocean from March to April 2016
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2019-03-15) Martiny, Adam ; Lomas, Michael W.
    Particulate organic matter (PON, POC, POP) concentrations collected on R/V Roger Revelle cruise RR1604 along the hydrographic line IO9 in the Eastern Indian Ocean from March to April 2016. 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/734915
  • Dataset
    Dissolved and particulate trace elements collected on cruise RR1604 (GO-SHIP transect IO9N) in the Eastern Indian Ocean from March to April 2016
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2022-07-12) Twining, Benjamin ; Lomas, Michael W. ; Martiny, Adam
    This dataset includes measurements of dissolved and particulate trace elements collected on cruise RR1604 (GO-SHIP transect IO9N) in the Eastern Indian Ocean from March to April 2016. 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/767658
  • Dataset
    Depth profile data from R/V Atlantic Explorer AE1319 in the NW Atlantic from Aug-Sept. 2013
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-11-20) Lomas, Michael W. ; Martiny, Adam
    Depth profile data including temperature, salinity, oxygen chlorophyll, and PAR from R/V Atlantic Explorer AE1319 in the NW Atlantic from Aug-Sept. 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/829797
  • Dataset
    Biogeochemistry of microbial phosphorus uptake from cruises in the Sargasso Sea; Bermuda Atlantic Time-Series Station from 2011-2013 (Biological C:N:P ratios project)
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-12-03) Lomas, Michael W. ; Bonachela, Juan A. ; Levin, Simon ; Martiny, Adam
    Biogeochemistry of microbial phosphorus uptake from cruises in the Sargasso Sea at the Bermuda Atlantic Time-Series Station 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/538091
  • Dataset
    Particulate organic matter (PON, POC, POP) concentrations collected on R/V Roger Revelle cruise RR1604 along the hydrographic line IO9 in the Eastern Indian Ocean from March to April 2016
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2021-02-18) Martiny, Adam ; Lomas, Michael W.
    Particulate organic matter (PON, POC, POP) concentrations collected on R/V Roger Revelle cruise RR1604 along the hydrographic line IO9 in the Eastern Indian Ocean from March to April 2016. 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/734915
  • Dataset
    Depth profile data from R/V New Horizons NH1418 in the tropical Pacific from Sept-Oct. 2014
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-11-20) Lomas, Michael W. ; Martiny, Adam
    Depth profile data including CTD, oxygen, chlorophyll, light, nutrients, microbe abundances, and DNA sample log from R/V New Horizons NH1418 in the tropical Pacific from Sept-Oct. 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/829895
  • Dataset
    CTD stations from the R/V Atlantic Explorer AE0922 in the North Atlantic, Bermuda BATS region during 2009 (TZEX project)
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-12-09) Buesseler, Kenneth O. ; Lamborg, Carl ; Lomas, Michael W. ; Siegel, David ; Steinberg, Deborah K. ; Valdes, Jim
    CTD stations from the R/V Atlantic Explorer AE0922 in the North Atlantic, Bermuda BATS region during 2009 (TZEX project) 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/3457
  • Dataset
    Direct measure of phytoplankton cell quotas from field populations sampled from multiple cruises cruises between 2010 and 2016
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2021-06-03) Lomas, Michael W. ; Martiny, Adam
    This dataset represents direct measures of phytoplankton cell quotas from field populations, contributing to the project goal of understanding how taxon-specific stoichiometry and growth rates, genomic analyses control the stoichiometry of surface ocean plankton. The field work included several cruises: AE1123 (September/October 2011) and AE1226 (September 2012) both from Bermuda to Puerto Rico, AE1319 (June 2013) from Bermuda to the Labrador Sea, and NH1418 (May 2014) from Hawaii to Tahiti, among others. 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/849153
  • Dataset
    Cellular trace elements collected on cruise RR1604 (GO-SHIP transect IO9N) in the Eastern Indian Ocean from March to April 2016
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2022-07-12) Twining, Benjamin ; Lomas, Michael W. ; Martiny, Adam
    This dataset includes measurements of cellular trace elements collected on cruise RR1604 (GO-SHIP transect IO9N) in the Eastern Indian Ocean from March to April 2016. 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/768064
  • Dataset
    Cruise event log from the R/V Atlantic Explorer AE0922 cruise in the North Atlantic, Bermuda BATS region during 2009 (TZEX project)
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-12-09) Buesseler, Kenneth O. ; Lamborg, Carl ; Lomas, Michael W. ; Siegel, David ; Steinberg, Deborah K. ; Valdes, Jim
    Cruise event log from the R/V Atlantic Explorer AE0922 cruise in the North Atlantic, Bermuda BATS region during 2009 (TZEX project) 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/3454
  • Dataset
    Depth profile data from Bermuda Atlantic Time-Series Validation cruise 46 (BVAL46) in the Sargasso Sea from Sept-Oct. 2011
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-11-20) Lomas, Michael W. ; Martiny, Adam
    Depth profile data including temperature, salinity, oxygen chlorophyll, and beam attenuation from Bermuda Atlantic Time-Series Validation cruise 46 (BVAL46) in the Sargasso Sea from Sept-Oct. 2011 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/829843
  • Dataset
    Phytoplankton diversity along with carbon and nitrogen uptake rates collected along the GO-SHIP IO9 repeat hydrography section of the Indian Ocean from R/V Roger Revelle cruise RR1604 from March to April 2016
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2021-05-18) Lomas, Michael W. ; Twining, Benjamin
    Phytoplankton diversity along with carbon and nitrogen uptake rates collected along the GO-SHIP IO9 repeat hydrography section of the Indian Ocean from R/V Roger Revelle cruise RR1604 from March to April 2016. 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/723191
  • Dataset
    Biogeochemistry of microbial phosphorus uptake from cruises in the Sargasso Sea; Bermuda Atlantic Time-Series Station from 2011-2013 (Biological C:N:P ratios project)
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2021-02-05) Lomas, Michael W. ; Bonachela, Juan A. ; Levin, Simon ; Martiny, Adam
    Biogeochemistry of microbial phosphorus uptake from cruises in the Sargasso Sea at the Bermuda Atlantic Time-Series Station 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/538091