Bio


I am an engineer and oceanographer who is interested in studying how physical processes shape coastal waters – combining principles of fluid mechanics, oceanography, and ecology. I use both field observations and numerical tools to examine circulation in the ocean, its natural variability, and influence on marine ecosystems and human-nature interactions. I joined Stanford department of Oceans in 2024. Before that, I was an Associate Professor in the Department of Civil & Environmental Engineering at the University of California, Irvine.

Academic Appointments


2024-25 Courses


Stanford Advisees


All Publications


  • Seaweed blue carbon: Ready? Or Not? MARINE POLICY Fujita, R., Augyte, S., Bender, J., Brittingham, P., Buschmann, A. H., Chalfin, M., Collins, J., Davis, K. A., Gallagher, J., Gentry, R., Gruby, R. L., Kleisner, K., Moritsch, M., Price, N., Roberson, L., Taylor, J., Yarish, C. 2023; 155
  • Large global variations in the carbon dioxide removal potential of seaweed farming due to biophysical constraints COMMUNICATIONS EARTH & ENVIRONMENT Arzeno-Soltero, I. B., Saenz, B. T., Frieder, C. A., Long, M. C., DeAngelo, J., Davis, S. J., Davis, K. A. 2023; 4 (1)
  • Author Correction: Economic and biophysical limits to seaweed farming for climate change mitigation. Nature plants DeAngelo, J., Saenz, B. T., Arzeno-Soltero, I. B., Frieder, C. A., Long, M. C., Hamman, J., Davis, K. A., Davis, S. J. 2023

    View details for DOI 10.1038/s41477-023-01393-1

    View details for PubMedID 36918722

  • Economic and biophysical limits to seaweed farming for climate change mitigation. Nature plants DeAngelo, J., Saenz, B. T., Arzeno-Soltero, I. B., Frieder, C. A., Long, M. C., Hamman, J., Davis, K. A., Davis, S. J. 2022

    Abstract

    Net-zero greenhouse gas (GHG) emissions targets are driving interest in opportunities for biomass-based negative emissions and bioenergy, including from marine sources such as seaweed. Yet the biophysical and economic limits to farming seaweed at scales relevant to the global carbon budget have not been assessed in detail. We use coupled seaweed growth and technoeconomic models to estimate the costs of global seaweed production and related climate benefits, systematically testing the relative importance of model parameters. Under our most optimistic assumptions, sinking farmed seaweed to the deep sea to sequester a gigaton of CO2 per year costs as little as US$480 per tCO2 on average, while using farmed seaweed for products that avoid a gigaton of CO2-equivalent GHG emissions annually could return a profit of $50 per tCO2-eq. However, these costs depend on low farming costs, high seaweed yields, and assumptions that almost all carbon in seaweed is removed from the atmosphere (that is, competition between phytoplankton and seaweed is negligible) and that seaweed products can displace products with substantial embodied non-CO2 GHG emissions. Moreover, the gigaton-scale climate benefits we model would require farming very large areas (>90,000km2)-a >30-fold increase in the area currently farmed. Our results therefore suggest that seaweed-based climate benefits may be feasible, but targeted research and demonstrations are needed to further reduce economic and biophysical uncertainties.

    View details for DOI 10.1038/s41477-022-01305-9

    View details for PubMedID 36564631

  • On Internal Tides Driving Residual Currents and Upwelling on an Island JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS Rogers, J. S., Mayer, F. T., Davis, K. A., Fringer, O. B. 2022; 127 (7)
  • Fate of Internal Waves on a Shallow Shelf JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS Davis, K. A., Arthur, R. S., Reid, E. C., Rogers, J. S., Fringer, O. B., Decarlo, T. M., Cohen, A. L. 2020; 125 (5)
  • Turbulence and Coral Reefs. Annual review of marine science Davis, K. A., Pawlak, G. n., Monismith, S. G. 2020

    Abstract

    The interaction of coral reefs, both chemically and physically, with the surrounding seawater is governed, at the smallest scales, by turbulence. Here, we review recent progress in understanding turbulence in the unique setting of coral reefs-how it influences flow and the exchange of mass and momentum both above and within the complex geometry of coral reef canopies. Flow above reefs diverges from canonical rough boundary layers due to their large and highly heterogeneous roughness and the influence of surface waves. Within coral canopies, turbulence is dominated by large coherent structures that transport momentum both into and away from the canopy, but it is also generated at smaller scales as flow is forced to move around branches or blades, creating wakes. Future work interpreting reef-related observations or numerical models should carefully consider the influence that spatial variation has on momentum and scalar flux. Expected final online publication date for the Annual Review of Marine Science, Volume 13 is January 3, 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

    View details for DOI 10.1146/annurev-marine-042120-071823

    View details for PubMedID 32762591

  • Temporal Variability in Thermally Driven Cross-Shore Exchange: The Role of Semidiurnal Tides JOURNAL OF PHYSICAL OCEANOGRAPHY Ulloa, H. N., Davis, K. A., Monismith, S. G., Pawlak, G. 2018; 48 (7): 1513–31
  • High frequency temperature variability reduces the risk of coral bleaching (vol 9, 2018) NATURE COMMUNICATIONS Safaie, A., Silbiger, N. J., McClanahan, T. R., Pawlak, G., Barshis, D. J., Hench, J. L., Rogers, J. S., Williams, G. J., Davis, K. A. 2018; 9: 2244

    Abstract

    The original version of the Article was missing an acknowledgement of a funding source. The authors acknowledge that A. Safaie and K.Davis were supported by National Science Foundation Award No. 1436254 and G. Pawlak was supported by Award No. 1436522. This omission has now been corrected in the PDF and HTML versions of the Article.

    View details for PubMedID 29872073

  • High frequency temperature variability reduces the risk of coral bleaching NATURE COMMUNICATIONS Safaie, A., Silbiger, N. J., McClanahan, T. R., Pawlak, G., Barshis, D. J., Hench, J. L., Rogers, J. S., Williams, G. J., Davis, K. A. 2018; 9: 1671

    Abstract

    Coral bleaching is the detrimental expulsion of algal symbionts from their cnidarian hosts, and predominantly occurs when corals are exposed to thermal stress. The incidence and severity of bleaching is often spatially heterogeneous within reef-scales (<1 km), and is therefore not predictable using conventional remote sensing products. Here, we systematically assess the relationship between in situ measurements of 20 environmental variables, along with seven remotely sensed SST thermal stress metrics, and 81 observed bleaching events at coral reef locations spanning five major reef regions globally. We find that high-frequency temperature variability (i.e., daily temperature range) was the most influential factor in predicting bleaching prevalence and had a mitigating effect, such that a 1 °C increase in daily temperature range would reduce the odds of more severe bleaching by a factor of 33. Our findings suggest that reefs with greater high-frequency temperature variability may represent particularly important opportunities to conserve coral ecosystems against the major threat posed by warming ocean temperatures.

    View details for PubMedID 29700296

  • The Modification of Bottom Boundary Layer Turbulence and Mixing by Internal Waves Shoaling on a Barrier Reef JOURNAL OF PHYSICAL OCEANOGRAPHY Davis, K. A., Monismith, S. G. 2011; 41 (11): 2223-2241
  • Flow effects on benthic grazing on phytoplankton by a Caribbean reef LIMNOLOGY AND OCEANOGRAPHY Monismith, S. G., Davis, K. A., Shellenbarger, G. G., Hench, J. L., Nidzieko, N. J., Santoro, A. E., Reidenbach, M. A., Rosman, J. H., Holtzman, R., Martens, C. S., Lindquist, N. L., Southwell, M. W., Genin, A. 2010; 55 (5): 1881-1892
  • Effects of western boundary current dynamics on the internal wave field of the Southeast Florida shelf JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS Davis, K. A., Leichter, J. J., Hench, J. L., Monismith, S. G. 2008; 113 (C9)
  • Submarine groundwater discharge: An important source of new inorganic nitrogen to coral reef ecosystems LIMNOLOGY AND OCEANOGRAPHY Paytan, A., Shellenbarger, G. G., Street, J. H., Gonneea, M. E., Davis, K., Young, M. B., Moore, W. S. 2006; 51 (1): 343-348