Oceanography | Vol. 38, No. 3
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• Develop overall sampling strategies from the ground up, utiliz-
ing the best available practices and technologies to respond to
changing local conditions while still providing quality results.
• Support high-quality observation platforms that provide his-
torical and ongoing observational context to mCDR activities,
including MRV and environmental impact assessments.
• Utilize and leverage existing monitoring platforms for mCDR
research, with care not to disrupt long-term “climate” time
series.
• Ensure monitoring systems provide highly resolved tempo-
ral and spatial variations to determine the relevant changes in
physical, chemical, and biological conditions.
• Co-develop biological indicators with both OA and mCDR
applications in mind.
• Encourage chemists and biologists to co-design mCDR research
to facilitate the understanding of environmental impacts and
monitoring requirements.
• Make data visualizations available in as near-real time as possi-
ble so that sampling efforts can be modified as needed to meet
the needs of field trials.
• Use existing data archive centers for both carbon and biological
data to contribute to open-access data sharing.
• Recognize that data management and quality assurance are
important contributions to mCDR: utilize existing best prac-
tices, provide metadata, and use quality assurance practices.
• Capitalize on modeling tools and expertise that have already
been developed across the necessary spatial scales.
• Provide local communities with opportunities to contribute to
monitoring their regions, allowing them to be informed and
involved in planning decisions.
• Collaborate across communities—co-develop mCDR research
with a range of interested parties from the beginning.
REFERENCES
Alter, K., J. Jacquemont, J. Claudet, M.E. Lattuca, M.E. Barrantes, S. Marras,
P.H. Manríquez, C.P. González, D.A. Fernández, M.A. Peck, and others. 2024.
Hidden impacts of ocean warming and acidification on biological responses of
marine animals revealed through meta-analysis. Nature Communications 15:2885,
https://doi.org/10.1038/s41467-024-47064-3.
Artioli, Y., J.C. Blackford, M. Butenschön, J.T. Holt, S.L. Wakelin, H. Thomas,
A.V. Borges, and J.I. Allen. 2012. The carbonate system in the North Sea: Sensitivity
and model validation. Journal of Marine Systems 102–104:1–13, https://doi.org/
10.1016/j.jmarsys.2012.04.006.
Artioli, Y., J.C. Blackford, G. Nondal, R.G.J. Bellerby, S.L. Wakelin, J.T. Holt,
M. Butenschön, and J.I. Allen. 2014. Heterogeneity of impacts of high CO2 on the
North Western European Shelf. Biogeosciences 11(3):601–612, https://doi.org/
10.5194/bg-11-601-2014.
Aumont, O., C. Ethé, A. Tagliabue, L. Bopp, and M. Gehlen. 2015. PISCES-v2: An ocean
biogeochemical model for carbon and ecosystem studies. Geoscientific Model
Development 8(8):2,465–2,513, https://doi.org/10.5194/gmd-8-2465-2015.
Bach, L.T., D.T. Ho, P.W. Boyd, and M.D. Tyka. 2023. Toward a consensus framework
to evaluate air–sea CO2 equilibration for marine CO2 removal. Limnology and
Oceanography Letters 8(5):685–691, https://doi.org/10.1002/lol2.10330.
Barton, A., G.G. Waldbusser, R.A. Feely, S.B. Weisberg, J.A. Newton, B. Hales, S. Cudd,
B. Eudeline, C.J. Langdon, I. Jefferds, and others. 2015. Impacts of coastal acid-
ification on the Pacific Northwest shellfish industry and adaptation strategies
implemented in response. Oceanography 28(2):146–159, https://doi.org/10.5670/
oceanog.2015.38.
Bednaršek, N., R.A. Feely, E.L. Howes, B.P.V. Hunt, F. Kessouri, P. León, S. Lischka,
A.E. Maas, K. McLaughlin, N.P. Nezlin, and others. 2019. Systematic review and
meta-analysis toward synthesis of thresholds of ocean acidification impacts on cal-
cifying pteropods and interactions with warming. Frontiers in Marine Science 6:227,
https://doi.org/10.3389/fmars.2019.00227.
Bednaršek, N., P. Calosi, R.A. Feely, R. Ambrose, M. Byrne, K.Y.K. Chan, S. Dupont,
J.L. Padilla-Gamiño, J.I. Spicer, F. Kessouri, and others. 2021. Synthesis of
thresholds of ocean acidification impacts on echinoderms. Frontiers in Marine
Science 8:602601, https://doi.org/10.3389/fmars.2021.602601.
Bednaršek, N., H. Van De Mortel, G. Pelletier, M. García-Reyes, R.A. Feely, and
A.G. Dickson. 2025. Assessment framework to predict sensitivity of marine cal-
cifiers to ocean alkalinity enhancement – identification of biological thresh-
olds and importance of precautionary principle. Biogeosciences 22(2):473–498,
https://doi.org/10.5194/bg-22-473-2025.
Berger, M., L. Kwiatkowski, D.T. Ho, and L. Bopp. 2023. Ocean dynamics and biological
feedbacks limit the potential of macroalgae carbon dioxide removal. Environmental
Research Letters 18:024039, https://doi.org/10.1088/1748-9326/acb06e.
Birchenough, S.N.R., H. Reiss, S. Degraer, N. Mieszkowska, Á. Borja,
L. Buhl-Mortensen, U. Braeckman, J. Craeymeersch, I. De Mesel, F. Kerckhof, and
others. 2015. Climate change and marine benthos: A review of existing research
and future directions in the North Atlantic. Wiley Interdisciplinary Reviews: Climate
Change 6(2):203–223, https://doi.org/10.1002/wcc.330
Boyd, P.W., H. Claustre, L. Legendre, J.-P. Gattuso, and P.-Y. Le Traon. 2023.
Operational monitoring of open-ocean carbon dioxide removal deployments:
Detection, attribution, and determination of side effects. Pp. 2–10 in Frontiers
in Ocean Observing: Emerging Technologies for Understanding and
Managing a Changing Ocean. E.S. Kappel, V. Cullen, M.J. Costello, L. Galgani,
C. Gordó-Vilaseca, A. Govindarajan, S. Kouhi, C. Lavin, L. McCartin, J.D. Müller,
B. Pirenne, T. Tanhua, Q. Zhao, and S. Zhao, eds, Oceanography 36(Supplement 1),
https://doi.org/10.5670/oceanog.2023.s1.2.
Brunner, C., Z. Hausfather, and R. Knutti. 2024. Durability of carbon dioxide removal
is critical for Paris climate goals. Communications Earth & Environment 5:645,
https://doi.org/10.1038/s43247-024-01808-7.
Busch, D.S., and P. McElhany. 2016. Estimates of the direct effect of seawater
pH on the survival rate of species groups in the California Current ecosystem.
PLoS ONE 11:e0160669, https://doi.org/10.1371/journal.pone.0160669.
Butenschön, M., T. Lovato, S. Masina, S. Caserini, and M. Grosso. 2021. Alkalinization
scenarios in the Mediterranean Sea for efficient removal of atmospheric CO2 and
the mitigation of ocean acidification. Frontiers in Climate 3:614537, https://doi.org/
10.3389/fclim.2021.614537.
Cai, W.-J., R.A. Feely, J.M. Testa, M. Li, W. Evans, S.R. Alin, Y.-Y. Xu, G. Pelletier,
A. Ahmed, D.J. Greeley, and others. 2021. Natural and anthropogenic drivers
of acidification in large estuaries. Annual Review of Marine Science 13:23–55,
https://doi.org/10.1146/annurev-marine-010419-011004.
Caldiera, K., and M. Wickett. 2003. Anthropogenic carbon and ocean pH.
Nature 425(365), https://doi.org/10.1038/425365a.
Carter, B.R., H.C. Bittig, A.J. Fassbender, J.D. Sharp, Y. Takeshita, Y. Xu, M. Álvarez,
R. Wanninkhof, R.A. Feely, and L. Barbero. 2021. New and updated global empir-
ical seawater property estimation routines. Limnology and Oceanography
Methods 19(12):785–809, https://doi.org/10.1002/lom3.10461.
Clegg, S.L., J.F. Waters, D.R. Turner, and A.G. Dickson. 2023. Chemical speciation
models based upon the Pitzer activity coefficient equations, including the propa-
gation of uncertainties: Part III. Seawater from the freezing point to 45°C, includ-
ing acid-base equilibria. Marine Chemistry 250:104196, https://doi.org/10.1016/
j.marchem.2022.104196.
Currie, K., C. Sabine, K. Lowder, A.E.R. Hassoun, M. Melendez, S. Chu, R. Easley,
M.I. Garcia-Ibanez, K. Schoo, K. Isensee, and others. 2024. Practical Best Practices
for Ocean Acidification Monitoring (1.1), https://doi.org/10.5281/ZENODO.13876198.
Dobson, K.L., J.A. Newton, S. Widdicombe, K.L. Schoo, M.P. Acquafredda, G. Kitch,
A. Bantelman, K. Lowder, A. Valauri-Orton, K. Soapi, and others. 2023. Ocean acidi-
fication research for sustainability: Co-designing global action on local scales. ICES
Journal of Marine Science 80(2):362–366, https://doi.org/10.1093/icesjms/fsac158.
Doney, S.C., V.J. Fabry, R.A. Feely, and J.A. Kleypas. 2009. Ocean acidifica-
tion: The other CO2 problem. Annual Review of Marine Science 1:169–192,
https://doi.org/10.1146/annurev.marine.010908.163834.
Doney, S.C., W.H. Wolfe, D.C. McKee, and J.G. Fuhrman. 2024. The science, engineer-
ing, and validation of marine carbon dioxide removal and storage. Annual Review of
Marine Science 17:55–81, https://doi.org/10.1146/annurev-marine-040523-014702.
Dong, Y., D.C.E. Bakker, and P. Landschützer. 2024. Accuracy of ocean CO2 uptake
estimates at a risk by a reduction in the data collection. Geophysical Research
Letters 51:e2024GL108502, https://doi.org/10.1029/2024GL108502.