Luke Gloege

Ph.D Candidate / Ocean Modeler

Research

My research focuses on understanding spatial patterns of nutrients and pCO2 in large lakes and oceans. I am interested in how biology and physics mediate these patterns to understand how the climate and ecosystems change over time. This work can lead to efficient managment efforts in large lakes and reduce uncertainty in the global carbon budget. Tools I use to tackle these problems include: computer models, satellite data, and in-situ observations.

pCO2 Interpolation Testbed

The ocean serves an important ecosystem service by reducing the impact of human derived carbon dioxide emissions. Quantifying the CO2 flux across the air-sea interface requires time-dependent maps of surface ocean pCO2. However, observations are sparse in space and time, making global flux estimates difficult. Various techniques have been developed to create time-dependent maps of pCO2 with a global coverage. However, the methods do not agree on the range of variability. This projects aims to create a testbed where these methods can be evaluated. The testbed is created using three independent coupled ocean-atmosphere large ensemble models sampled at observation locations. We use this testbed to statistically evaluate how well different gap-filling approaches are able to reconstruct the spatial pattern of pCO2 in different climate states This work is important to reducing uncertainty in the global carbon budget and assessing whether the goals of the UNFCCC Paris agreement are being achieved.

Biological Carbon Pump

The shunt of photosynthetically derived particulate organic carbon (POC) out of the surface ocean is an integral component of the “biological pump.” POC raining through the deep ocean is remineralized back to dissolved inorganic carbon though microbial respiration. Accurately modeling POC flux is critical for understanding the “biological pump” and its impacts on air-sea CO2 exchange and, ultimately, long-term ocean carbon sequestration. Yet commonly used parameterizations have not been tested quantitatively against global data sets using identical modeling frameworks. We use a single one-dimensional physical-biogeochemical modeling framework to assess three common POC flux parameterizations in capturing POC flux observations from moored sediment traps and thorium-234 depletion. This work has implications for understanding how the climate and ecosystem services will change in the future.

Lake Michigan Ecosystem Services

The Great Lakes are a treasured natural resource that contain over 80% of North America's surface freshwater. Tributary nutrient loads degrade Great Lakes coastal ecosystems and services they provide, including drinking water, fisheries, and recreation. In Lake Michigan, open-lake total phosphorus concentrations are below Great Lakes Water Quality agreement (GLWQA) target concentrations but are elevated in the coastal zone. A realistic three-dimensional hydrodynamic model of Lake Michigan was developed to simulate the redistribution of tributary-derived phosphorus loads in the lake. In spring along most of the shoreline, riverine phosphorus is trapped in coastal plumes that eventually spread offshore in summer. Ths simulation is used in tandem with time-invariant maps of ecosystem services to calculate stress due to excesive nutrient concentrations.Load magnitudes, in-lake physics, and the spatial distribution of ecosystem services all contribute to coastal service impacts. The quantitative framework is applicable to a wide range of pollutants and waterbodies and has the potential to increase the efficiency of coastal management.

Publications

In Review / In Prep.

  1. Gloege, L., McKinley, G. A., Mooney, R., Allan, J. D., Diebel, M., & McIntyre, P. B. Physical enhancement of nutrient stress to Great Lakes ecosystem services. in prep.
  2. Gloege, L., McKinley, G. A., Landschutzer, P., Rodgers, K., and A. Fay, Frolicher, T., … Takano, Y. Large ensemble testbed to evaluate pCO2 interpolation methods. in prep.
  3. Gloege, L., McKinley, G. A., Zheng, T., and L. Gao, Goyette, C., Gupta, M., … Yan, M. LDEO-hMODeL : a hyrid interpolation method combining models, observations, and deep learning. in prep.
  4. Abell1, J. T., Pullen, A., Lebo, Z. J., Winckler, G., Kapp, P., Gloege, L., … Nie, J. A Wind on Wind Feedback Mechanism: Landscape Evolution, Wind Speeds, and Dust Emissions in the Rocky Desert of the Turpan-Hami Depression. in review at Nature Communications.
  5. McKinley, G. A., Fay, A. R., Gloege, L., & Lovenduski, N. S. External forcing explains recent decadal variability of the ocean carbon sink. in review at Nature.

Published

  1. Mouw, C. B., Barnett, A., McKinley, G. A., Gloege, L., & Pilcher, D. J. (2016). Global ocean particulate organic carbon flux merged with satellite parameters. Earth Syst. Sci. Data, 8, 531–541. https://doi.org/10.5194/essd-8-531-2016 PDF Journal Link
  2. Mouw, C. B., Barnett, A., McKinley, G. A., Gloege, L., & Pilcher, D. J. (2016). Phytoplankton size impact on export flux in the global ocean. Global Biogeochem. Cycles, 30, 1542–1562. https://doi.org/10.1002/2015GB005355 PDF Journal Link
  3. Gloege, L., McKinley, G. A., Mouw, C. B., & Barnett, A. (2017). Global evaluation of particulate organic carbon flux parameterizations and implications for atmospheric pCO2. Global Biogeochem. Cycles, 31, 1192–1215. https://doi.org/10.1002/2016GB005535 PDF Journal Link

Presentations

  1. Gloege, L., & Austin, J. (2013). Modeling Near-Inertial Waves in Lake Superior, presented at 56th annual International Association Great Lakes Research conference. Purdue, IN.
  2. Gloege, L., McKinley, G. A., Mouw, C. B., & Ciochetto, A. (2016). A Global Evaluation of Model Parameterizations for Carbon Export and Remineralization, presnted at Ocean Science Meeting 2016. New Orleans, LA.
  3. Gloege, L., McKinley, G. A., Mouw, C. B., & Ciochetto, A. (2016). Parameterizing Carbon Export Below the Euphotic Zone, presnted at the first Gordon Research Conference on Ocean Biogeochemistry. Hong Kong, China.
  4. Gloege, L., McKinley, G. A., McIntyre, P., & Mooney., R. (2017). Fate of Tributary Loads to Lake Michigan, presented at 2017 Climate Change Symposium / Reid Bryson Poster Competiation. Madison, WI.
  5. Gloege, L., McKinley, G. A., McIntyre, P., & Mooney, R. (2017). Fate of Tributary Loads to Lake Michigan, presented at 60th annual International Association Great Lakes Research conference. Detroi, MI.
  6. Gloege, L., McKinley, G. A., Mouw, C. B., & Ciochetto, A. (2017). Constraining the Potential Influence of the Ocean Biological Pump on Atmospheric pCO2, presented at the 10th International Carbon Dioxide Conference. Interlaken, Switzerland.
  7. Gloege, L., McKinley, G. A., McIntyre, P., Mooney, R., Allan, J. D., & Diebel, M. (2018). Potential impacts of tributary loads on coastal ecosystem services in Lake Michigan, presented at Ocean Sciences 2018. Portland, OR.
  8. Gloege, L., McKinley, G. A., McIntyre, P., Mooney, R., Allan, J. D., & Diebel, M. (2018). Potential impacts of tributary loads on coastal ecosystem services in Lake Michigan, presented at Society for Freshwater Science annual meeting. Detroit, MI.
  9. Gloege, L., McKinley, G. A., Landschutzer, P., Rodgers, K., & Schlunegger, S. (2018). Evaluating pCO2 interpolation methods using large ensembles - preliminary results, presented at Ocean Carbon Biogeochemistry workshop. Woods Hole, MA.
  10. Gloege, L., McKinley, G. A., Landschutzer, P., Rodgers, K., and A. Fay, Frolicher, T., … Takano, Y. (2018). Large ensemble testbed to evaluate pCO2 interpolation methods, presented at CMIP6 workshop. Washington, DC.
  11. Gloege, L., McKinley, G. A., Landschutzer, P., Rodgers, K., and A. Fay, Frolicher, T., … Takano, Y. (2018). Large ensemble testbed to evaluate pCO2 interpolation methods, presented at American Geophysical Union Fall Meeting. Washington, DC.
  12. Gloege, L., McKinley, G. A., Zheng, T., and L. Gao, Goyette, C., Gupta, M., … Yan, M. (2019). Can a neural network trained with a climate model inform the real-world?, presented at New York Scientific Data Summit 2019. New York, NY.
  13. Gloege, L., McKinley, G. A., Landschutzer, P., Rodgers, K., and A. Fay, Frolicher, T., … Takano, Y. (2019). Large ensemble testbed to evaluate pCO2 interpolation methods, to be presented at Large Enesemble Workshop. Boulder, CO.

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