Monismith Stephen G.

No Thumbnail Available
Last Name
Monismith
First Name
Stephen G.
ORCID
0000-0002-7388-3313

Search Results

Now showing 1 - 15 of 15
  • Article
    Observing larval transport processes affecting population connectivity : progress and challenges
    (Oceanography Society, 2007-09) Gawarkiewicz, Glen G. ; Monismith, Stephen G. ; Largier, John
    Population connectivity is inherently bio-physical: it is determined by physical transport and dispersion, as well as biological processes such as timing of spawning, larval behavior, and mortality. Knowledge of connectivity is essential for understanding ecosystem responses to changing environmental conditions. It establishes the spatial scales over which a population is connected, and in turn the primary spatial scale of population interactions and ecosystem dynamics. Concepts in population connectivity were initially developed in terrestrial ecology, where dispersal may occur at different life stages. In the simplest form, a one-dimensional dispersal curve describes the distribution of settlers away from a source region as a function of distance. As this spatial distribution varies in time, the “dispersal kernel” defines a spatial probability density function of settlers aggregated over time (see, e.g., Okubo and Levin, 2002). This dispersal kernel may be three dimensional, but is often reduced to two dimensions (e.g., animals on a plain) or one dimension (e.g., animals living along the land-water interface).
  • Article
    Influence of kelp forest biomass on nearshore currents
    (American Geophysical Union, 2022-06-24) Monismith, Stephen G. ; Alnajjar, Maha W. ; Woodson, Clifton Brock ; Boch, Charles A. ; Hernandez, Arturo ; Vazquez-Vera, Leonardo ; Bell, Tom W. ; Micheli, Fiorenza
    As part of a project focused on the coastal fisheries of Isla Natividad, an island on the Pacific coast of Baja California, Mexico, we conducted a 2-1/2 year study of flows at two sites within the island's kelp forests. At one site (Punta Prieta), currents are tidal, whereas at the other site (Morro Prieto), currents are weaker and may be more strongly influenced by wind forcing. Satellite estimates of the biomass of the giant kelp (Macrocystis pyrifera) for this period varied between 0 (no kelp) and 3 kg/m2 (dense kelp forest), including a period in which kelp entirely was absent as a result of the 2014–2015 “Warm Blob” in the Eastern Pacific. During this natural “deforestation experiment”, alongshore velocities at both sites when kelp was present were substantially weaker than when kelp was absent, with low-frequency alongshore currents attenuated more than higher frequency ones, behavior that was the same at both sites despite differences in forcing. The attenuation of cross-shore flows by kelp was less than alongshore flows; thus, residence times for water inside the kelp forest, which are primarily determined by cross-shore velocities, were only weakly affected by the presence or absence of kelp. The flow changes we observed in response to changes in kelp density are important to the biogeochemical functioning of the kelp forest in that slower flows imply longer residence times, and, are also ecologically relevant in that reduced tidal excursions may lead to more localized recruitment of planktonic larvae.
  • Dataset
    Temperature, oxygen, pH, depth, and conductivity measured at 5 m depth at Hopkins Marine Station from 18-April 2013 to 14-June 2013
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2019-08-02) Barry, James P. ; De Leo, Giulio Alessandro ; Monismith, Stephen G. ; Woodson, Clifton Brock
    oxygen, pH, depth, and conductivity measured at 5 m depth at Hopkins Marine Station from 18-April 2013 to 14-June 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/707023
  • Dataset
    Nighttime surface chlorophyll-a concentrations at the MBARI OA1 Buoy (36° 37.373’ N, 121 ° 54.000’ W) from June to October 2018
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-10-16) Hirsh, Heidi ; Nickols, Kerry J. ; Takeshita, Yuichiro ; Traiger, Sarah ; Monismith, Stephen G. ; Mucciarone, David ; Dunbar, Robert B.
    Nighttime surface chlorophyll-a concentrations at the MBARI OA1 Buoy (36° 37.373’ N, 121 ° 54.000’ W) from June to October 2018 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/822494
  • Dataset
    pH measured in situ over depth in the kelp forest (36° 37.3’ N, 121° 54.1’ W) recorded in July 2018.
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-10-16) Hirsh, Heidi ; Nickols, Kerry J. ; Takeshita, Yuichiro ; Traiger, Sarah ; Monismith, Stephen G. ; Mucciarone, David ; Dunbar, Robert B.
    pH measured in situ over depth in the kelp forest (36° 37.3’ N, 121° 54.1’ W) recorded in July 2018. 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/826162
  • Dataset
    Surface irradiance measured on the roof of the Monterey Bay Aquarium (36.62 °N, 121.90 °W) from June to October 2018
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-10-16) Hirsh, Heidi ; Nickols, Kerry J. ; Takeshita, Yuichiro ; Traiger, Sarah ; Monismith, Stephen G. ; Mucciarone, David ; Dunbar, Robert B.
    Surface irradiance measured on the roof of the Monterey Bay Aquarium (36.62 °N, 121.90 °W) from June to October 2018. 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/822517
  • Dataset
    Cross-shore and alongshore velocity inside the kelp forest at Hopkins Marine Station (36° 37.297’ N, 121° 54.102’ W) recorded between June and October, 2018.
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-10-16) Hirsh, Heidi ; Nickols, Kerry J. ; Takeshita, Yuichiro ; Traiger, Sarah ; Monismith, Stephen G. ; Mucciarone, David ; Dunbar, Robert B.
    Cross-shore and alongshore velocity inside the kelp forest at Hopkins Marine Station (36° 37.297’ N, 121° 54.102’ W) recorded between June and October, 2018. 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/826431
  • Dataset
    Kelp forest mooring DIC, TA, pCO2, and aragonite saturation state estimations inside the kelp canopy (36° 37.297’ N, 121° 54.102’ W.) at Hopkins Marine Station, recorded between June and October 2018.
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-10-16) Hirsh, Heidi ; Nickols, Kerry J. ; Takeshita, Yuichiro ; Traiger, Sarah ; Monismith, Stephen G. ; Mucciarone, David ; Dunbar, Robert B.
    Kelp forest mooring DIC, TA, pCO2, and aragonite saturation state estimations inside the kelp canopy (36° 37.297’ N, 121° 54.102’ W.) at Hopkins Marine Station, recorded between June and October 2018. 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/823008
  • Dataset
    Dissolved Inorganic Carbon measured in situ over depth in the kelp forest (36° 37.3’ N, 121° 54.1’ W) recorded in July 2018.
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-10-16) Hirsh, Heidi ; Nickols, Kerry J. ; Takeshita, Yuichiro ; Traiger, Sarah ; Monismith, Stephen G. ; Mucciarone, David ; Dunbar, Robert B.
    Dissolved Inorganic Carbon measured in situ over depth in the kelp forest (36° 37.3’ N, 121° 54.1’ W) recorded in July 2018. 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/826200
  • Dataset
    Discrete seawater samples collected at the surface, 1 m below the surface, and 1 m above the bottom two times a week at each mooring (Kelp and Outside) from June 12, 2018 to August 3, 2018.
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-10-16) Hirsh, Heidi ; Nickols, Kerry J. ; Takeshita, Yuichiro ; Traiger, Sarah ; Monismith, Stephen G. ; Mucciarone, David ; Dunbar, Robert B.
    Discrete seawater samples collected at the surface, 1 m below the surface, and 1 m above the bottom two times a week at each mooring (Kelp and Outside) from June 12, 2018 to August 3, 2018. 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/826410
  • Article
    The modification of bottom boundary layer turbulence and mixing by internal waves shoaling on a barrier reef
    (American Meteorological Society, 2011-11-01) Davis, Kristen A. ; Monismith, Stephen G.
    Results are presented from an observational study of stratified, turbulent flow in the bottom boundary layer on the outer southeast Florida shelf. Measurements of momentum and heat fluxes were made using an array of acoustic Doppler velocimeters and fast-response temperature sensors in the bottom 3 m over a rough reef slope. Direct estimates of flux Richardson number Rf confirm previous laboratory, numerical, and observational work, which find mixing efficiency not to be a constant but rather to vary with Frt, Reb, and Rig. These results depart from previous observations in that the highest levels of mixing efficiency occur for Frt < 1, suggesting that efficient mixing can also happen in regions of buoyancy-controlled turbulence. Generally, the authors find that turbulence in the reef bottom boundary layer is highly variable in time and modified by near-bed flow, shear, and stratification driven by shoaling internal waves.
  • Article
    Similarity scaling of turbulence spectra and cospectra in a shallow tidal flow
    (American Geophysical Union, 2011-10-15) Walter, Ryan K. ; Nidzieko, Nicholas J. ; Monismith, Stephen G.
    Measured turbulence power spectra, cospectra, and ogive curves from a shallow tidal flow were scaled using Monin-Obukhov similarity theory to test the applicability to a generic tidal flow of universal curves found from a uniform, neutrally stable atmospheric boundary layer (ABL). While curves from individual 10 min data bursts deviate significantly from similarity theory, averages over large numbers of sufficiently energetic bursts follow the general shape. However, there are several differences: (1) Variance in the measured curves was shifted toward higher frequencies, (2) at low frequencies, velocity spectra were significantly more energetic than theory while cospectra were weaker, and (3) spectral ratios of momentum flux normalized by turbulent kinetic energy (TKE) indicate decreased fluxes and/or elevated TKE levels. Several features of the turbulence structure may explain these differences. First, turbulent dissipation exceeded production, indicating nonequilibrium turbulence, possibly from advection of TKE. Indeed, using the production rate rather than dissipation markedly improves agreement in the inertial subrange. Second, spectral lag of the largest eddies due to inhomogeneous boundary conditions and decaying turbulence could explain spectral deviations from theory at low frequencies. Finally, since the largest eddies dominate momentum transfer, the consequence of the cospectra difference is that calculated ogive curves produced smaller total momentum fluxes compared to theory, partly because of countergradient fluxes. While ABL similarity scaling applied to marine bottom boundary layers (MBBLs) will produce curves with the general shape of the universal curves, care should be taken in determining details of turbulent energy and stress estimates, particularly in shallow and inhomogeneous MBBLs.
  • Dataset
    Data from moored instruments (pH, dissolved oxygen, temperature, salinity, PAR, pressure) at 9 depths outside and inside the kelp canopy at Hopkins Marine Station, recorded between June and October 2018.
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-10-16) Hirsh, Heidi ; Nickols, Kerry J. ; Takeshita, Yuichiro ; Traiger, Sarah ; Monismith, Stephen G. ; Mucciarone, David ; Dunbar, Robert B.
    Data from moored instruments (pH, dissolved oxygen, temperature, salinity, PAR, pressure) at 9 depths outside (36° 37.342’ N, 121° 54.049’ W) and inside the kelp canopy (36° 37.297’ N, 121° 54.102’ W.) at Hopkins Marine Station, recorded between June and October 2018. The tidal depth of the kelp canopy mooring ranges from 8 to 11 meter. The outside mooring is located 115m north and offshore from the kelp forest, the tidal range is 16 to 9 meters. 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/822549
  • Dataset
    Cross-shore and alongshore velocity outside the kelp forest at Hopkins Marine Station (36° 37.342’ N, 121° 54.049’ W) recorded between June and October, 2018.
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-10-16) Hirsh, Heidi ; Nickols, Kerry J. ; Takeshita, Yuichiro ; Traiger, Sarah ; Monismith, Stephen G. ; Mucciarone, David ; Dunbar, Robert B.
    Cross-shore and alongshore velocity outside the kelp forest at Hopkins Marine Station (36° 37.342’ N, 121° 54.049’ W) recorded between June and October, 2018. 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/822913
  • Dataset
    Number of new fronds recorded at the kelp forest mooring (36° 37.297’ N, 121° 54.102’ W.) at Hopkins Marine Station recorded from July to August 2018.
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-10-16) Hirsh, Heidi ; Nickols, Kerry J. ; Takeshita, Yuichiro ; Traiger, Sarah ; Monismith, Stephen G. ; Mucciarone, David ; Dunbar, Robert B.
    Number of new fronds recorded at the kelp mooring (Central CA Macrocystis pyrifera forest, 36° 37.297’ N, 121° 54.102’ W) from July to August 2018. 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/822535