Other Resources

Presentation Resources

Program on Climate Change Summer Institute 2025

Friday Harbor, WA, USA

“Deriving Mixed Layer Boundary Conditions from Ocean Transient Tracer Observations”

Click here for a PDF of my poster.

This poster is a preview of work to be presented at AGU 2025 in New Orleans, LA, USA. More detailed methods, code, and graphics will be provided here. Citations associated with the poster are below.

Citations

  1. He, Y., Tjiputra, J., Langehaug, H. R., Jeansson, E., Gao, Y., Schwinger, J., & Olsen, A. (2018). A Model‐Based Evaluation of the Inverse Gaussian Transit‐Time Distribution Method for Inferring Anthropogenic Carbon Storage in the Ocean. Journal of Geophysical Research: Oceans, 123(3), 1777–1800. https://doi.org/10.1002/2017JC013504
  2. Haine, T. W. N. (2006). On tracer boundary conditions for geophysical reservoirs: How to find the boundary concentration from a mixed condition. Journal of Geophysical Research: Oceans, 111(C5), 2005JC003215. https://doi.org/10.1029/2005JC003215
  3. Orsi, A. H., Smethie, W. M., & Bullister, J. L. (2002). On the total input of Antarctic waters to the deep ocean: A preliminary estimate from chlorofluorocarbon measurements. Journal of Geophysical Research: Oceans, 107(C8). https://doi.org/10.1029/2001JC000976
  4. Lauvset, S. K., Lange, N., Tanhua, T., Bittig, H. C., Olsen, A., Kozyr, A., Álvarez, M., Azetsu-Scott, K., Brown, P. J., Carter, B. R., Cotrim Da Cunha, L., Hoppema, M., Humphreys, M. P., Ishii, M., Jeansson, E., Murata, A., Müller, J. D., Pérez, F. F., Schirnick, C., … Key, R. M. (2024). The annual update GLODAPv2.2023: The global interior ocean biogeochemical data product. Earth System Science Data, 16(4), 2047–2072. https://doi.org/10.5194/essd-16-2047-2024
  5. Johnson, G. C., & Lyman, J. M. (2022). GOSML: A Global Ocean Surface Mixed Layer Statistical Monthly Climatology: Means, Percentiles, Skewness, and Kurtosis. Journal of Geophysical Research: Oceans, 127(1), e2021JC018219. https://doi.org/10.1029/2021JC018219
  6. Bullister, J. L., & Warner, M. J. (2017). Atmospheric Histories (1765-2022) for CFC-11, CFC-12, CFC-113, CCl4, SF6 and N2O (NCEI Accession 0164584) [Dataset]. NOAA National Centers for Environmental Information. https://doi.org/10.3334/CDIAC/OTG.CFC_ATM_HIST_2015
  7. Meinshausen, M., Nicholls, Z. R. J., Lewis, J., Gidden, M. J., Vogel, E., Freund, M., Beyerle, U., Gessner, C., Nauels, A., Bauer, N., Canadell, J. G., Daniel, J. S., John, A., Krummel, P. B., Luderer, G., Meinshausen, N., Montzka, S. A., Rayner, P. J., Reimann, S., … Wang, R. H. J. (2020). The shared socio-economic pathway (SSP) greenhouse gas concentrations and their extensions to 2500. Geoscientific Model Development, 13(8), 3571–3605. https://doi.org/10.5194/gmd-13-3571-2020
  8. Mikaloff Fletcher, S. E., Gruber, N., Jacobson, A. R., Doney, S. C., Dutkiewicz, S., Gerber, M., Follows, M., Joos, F., Lindsay, K., Menemenlis, D., Mouchet, A., Müller, S. A., & Sarmiento, J. L. (2006). Inverse estimates of anthropogenic CO2 uptake, transport, and storage by the ocean. Global Biogeochemical Cycles, 20(2), 2005GB002530. https://doi.org/10.1029/2005GB002530
  9. Gammon, R. H., Cline, J., & Wisegarver, D. (1982). Chlorofluoromethanes in the northeast Pacific Ocean: Measured vertical distributions and application as transient tracers of upper ocean mixing. Journal of Geophysical Research: Oceans, 87(C12), 9441–9454. https://doi.org/10.1029/JC087iC12p09441
  10. Haine, T. W. N., Griffies, S. M., Gebbie, G., & Jiang, W. (2025). A Review of Green’s Function Methods for Tracer Timescales and Pathways in Ocean Models. Journal of Advances in Modeling Earth Systems, 17(7), e2024MS004637. https://doi.org/10.1029/2024MS004637
  11. Khatiwala, S., Primeau, F., & Hall, T. (2009). Reconstruction of the history of anthropogenic CO2 concentrations in the ocean. Nature, 462(7271), 346–349. https://doi.org/10.1038/nature08526
  12. Carter, B. R., Schwinger, J., Sonnerup, R., Fassbender, A. J., Sharp, J. D., Dias, L. M., & Sandborn, D. E. (2025). Tracer-based rapid anthropogenic carbon estimation (TRACE). Earth System Science Data, 17(6), 3073–3088. https://doi.org/10.5194/essd-17-3073-2025
  13. Shao, A. E., Mecking, S., Thompson, L., & Sonnerup, R. E. (2013). Mixed layer saturations of CFC-11, CFC-12, and SF6 in a global isopycnal model: Surface Saturation of CFCs and SF6. Journal of Geophysical Research: Oceans, 118(10), 4978–4988. https://doi.org/10.1002/jgrc.20370
  14. Raimondi, L., Tanhua, T., Azetsu‐Scott, K., Yashayaev, I., & Wallace, D. W. R. (2021). A 30 ‐Year Time Series of Transient Tracer‐Based Estimates of Anthropogenic Carbon in the Central Labrador Sea. Journal of Geophysical Research: Oceans, 126(5), e2020JC017092. https://doi.org/10.1029/2020JC017092

ASLO 2024

Madison, WI, USA

“Patterns of Lake Superior AIS dispersal illustrated by particle tracking”

This presentation is associated with a manuscript:

Sandborn, D. E.; Austin, J. A.; Lafrancois, B. M. (2025). ``Developing a particle tracking model in Lake Superior’’. NPS Reports. In review.

OCB 2023

Woods Hole, MA, USA

“The Other CO2 Problem in the Saltless Seas: High-Resolution Observations in Lake Superior”

Click here for a PDF of my poster.

This poster is associated with a publication:

Sandborn, D. E. & Minor, E. C. (2024). Underway pCO2 surveys unravel CO2 invasion of Lake Superior from seasonal variability. Journal of Geophysical Research: Biogeosciences, 129, e2023JG007877. doi:10.1029/2023JG007877

Outreach and Teaching

Day of [Water] Data 2023

A demonstration of data science tools applied to local water resources research.

WikiProject Limnology and Oceanography

A collaborative effort to improve L&O-related content on Wikipedia.

Coding

TRACE

TRACE: Tracer-based Rapid Anthropogenic Carbon Estimation is an algorithm for estimation of anthropogenic carbon in the ocean. It’s available for MATLAB (originally – see the TRACEv1 paper) and my work-in-progress Python port.

RPi-Alkalinity

Resources for open-source, low-cost alkalinity titration with a Raspberry Pi. This project is described further in the associated publication.