Lin, Y., Gifford, S., Ducklow, H., Schofield, O., Cassar, N. Towards quantitative marine microbiome community profiling using internal standards. Submitted.

Tang, W., Wang, S., Fonseca-Batista, D., Dehairs, F., Gifford, S., Gonzalez, A. G., Planquette, H., Sarthou, G., Gallinari, M., Cassar, N. Coastal Oceans broaden the biogeography of marine N2 fixation. Submitted.

Li, Z., Cassar, N., Lozier, M. S. Southern Ocean mixed layer dynamics and net community production on intra-seasonal, seasonal, interannual, and multi-year timescales. Submitted.

Wang, S., Lin, Y., Gifford, S., Eveleth, R., Cassar, N. Linking patterns of net community production and marine microbial community structure in the western North Atlantic. In review in ISME.

Ducklow, H. W., Stukel, M., Eveleth, R., Jickells, T.,  Schofield, O., Doney, S., Baker, A., Brindle, J., Chance, R., Cassar, N. 2018. Spring-summer net community production, new production, particle export and related water column biogeochemical processes in the marginal sea ice zone of the Western Antarctic Peninsula 2012-2014. In Press in Phil Trans Royal Soc , DOI 10.1098/rsta.2017.0177.

Cassar, N., Tang, W., Gabathuler, H., Huang, K. 2018. Method for high frequency underway N2 fixation measurements: Flow-through incubation Acetylene Reduction Assays by Cavity ring down laser Absorption Spectroscopy (FARACAS). Analytical Chemistry, 90 : 2839-2851.

Moreno, C. M., Lin, Y., Davies, S. W., Monbureau, E., Cassar, N., Marchetti, A. 2017. Examination of gene repertoires and physiological responses to iron and light limitation in Southern Ocean diatoms.  Polar Biology,

Lin, Y., Cassar, N., Marchetti, A., Ducklow, H., Li, Z. 2017. Specific eukaryotic plankton are good predictors of net community production in the Southern Ocean. Nature Scientific Reports, doi:10.1038/s41598-017-14109-1.

Li, Z. & Cassar, N. 2017. A mechanistic model of an upper bound on oceanic carbon export as a function of mixed layer depth and temperature. Biogeosciences, 14, 5015-5027.

Eveleth, R., Cassar, N., Sherrell, R. M., Meredith, M. P., Ducklow, H., Lin, Y., Li, Z. 2017. Ice melt influence on summertime net community production along the Western Antarctic Peninsula. Deep Sea Research II: 139: 89-102.

Eveleth, R., Cassar, N., Doney, S.C., Munro, D.R., Sweeney C. 2017. Biological and physical controls on O2/Ar, Ar and pCO2 variability at the Western Antarctic  Peninsula and Drake Passage. Deep Sea Research II, 139: 77-88.

Erickson, Z. K., Thompson, A. F., Cassar, N., Sprintall, J. 2016. Advective generation of Deep-Chlorophyll Maxima (DCMs) in Southern Drake Passage. Geophysical Research Letters,10.1002/2016GL070565.

Li, Z., Cassar, N., Huang, K.,  Ducklow, H., Schofield, O. 2016. Interannual variability in net community production at the Western Antarctic Peninsula region (1997-2014). Journal of Geophysical Research, doi: 10.1002/2015JC011378.

Li, Z. & Cassar, N. 2016. Satellite estimates of net community production based on O2/Ar observations and comparison to previous estimates. Global Biogeochemical Cycles, doi: 10.1002/2015GB005314.

Bender, M. L., Tilbrook, B.,  Cassar, N., Jonsson, B., Poisson, A., Trull, T.  W. 2016. Ocean productivity south of Australia during spring and summer. Deep Sea Research Part I, 112: 68-78.

Huang, K., Cassar, N., Jonsson, B., Cai, W.-J., Bender, M. L. 2015. An ultra-high precision, high frequency dissolved inorganic carbon analyzer based on dual isotope dilution and cavity ring-down spectroscopy. Environmental Science & Technology, 49 (14): 8602–8610.

Marchetti, A., Catlett, D., Hopkinson, B. M., Ellis, K., Cassar, N. 2015. Marine eukaryotic proteorhodopsins and their potential role in coping with low iron availability. ISME, doi: 10.1038/ismej.2015.74.

Cassar, N., Wright, S. W., Thomson, P., Trull, T. W., Westwood, K. J., de Salas, M., Davidson, A., Pearce, I., Davies, D. M., Matear, R. J. 2015. The relation of net community production to phytoplankton community composition in the Southern Ocean. Global Biogeochemical Cycles, doi: 10.1002/2014GB004936.

Shadwick, E. H., Tilbrook, B., Cassar, N., Trull, T. W., Rintoul, S. R.  2015. Summertime physical and biological controls on O2 and CO2 in the Australian Sector of the Southern Ocean. Journal of Marine Systems, 147: 21-28.

Cassar, N., Nevison, C. D., Manizza, M. 2014. Correcting oceanic O2/Ar-net community production estimates for vertical mixing using N2O observations. Geophysical Research Letters,DOI: 10.1002/2014GL062040.

Ulfsbo, A. Cassar, N., Korhonen, M., van Heuven, S., Hoppema, M., Kattner, G., Anderson, L. G. 2014.Late summer net community production estimates in the Central Arctic Ocean based on multiple approaches. Global Biogeochemical Cycles, doi: 10.1002/2014GB004833.

Eveleth, R. Timmermans, M.-L., Cassar, N. 2014. Physical and biological controls on oxygen saturation in the upper Arctic Ocean. Journal of Geophysical Research, DOI: 10.1002/2014JC009816.

Rödenbeck, C., Bakker, D. C. E., Metzl, N., Olsen, A., Sabine, C., Cassar, N., Reum, F., Keeling, R. F., Heimann, M. 2014. Interannual sea-air CO2 flux variability from an observation-driven ocean mixed-layer scheme. Biogeosciences, doi:10.5194/bg-11-4599-2014.

Rutgers v.d. Loeff, M., Cassar, N., Nicolaus, M., Rabe, B., Stimac, I.  2014. The influence of sea-ice cover on air-sea gas exchange estimated with radon-222 profiles. Journal of Geophysical Research, 119: 2735-2751.

Chang, C.-H., Johnson, N. C., Cassar, N. 2014. Neural network-based estimates of Southern Ocean net community production from in-situ O2/Ar and satellite observations: A methodological study. Biogeosciences, 11: 3279-3297.

Huang, K., Cassar, N., Wanninkhof, R., Bender, M. L. 2013. A novel method for high frequency measurements of dissolved inorganic carbon concentration in the surface ocean. Limnology and Oceanography: Methods 11: 572-583.

Martin, P., Rutgers v.d. Loeff, M., Cassar, N., Vandromme, P., d’Ovidio, F., Rengarajan, R., Soares, M., Gonzales, H. E., Ebersbach, F., Lampitt, R. S., Sanders, R., Barnett, B. A., Smetacek, V., Naqvi, S. W. A. 2013. Iron fertilization enhanced et community production but not downward particle flux during the Southern Ocean iron fertilization experiment LOHAFEX. Global Biogeochemical Cycles, Vol. 27: 1-11, doi: 10.1002/gbc.20077.

Li, Z., Li, L., Song, K., Cassar, N. 2013. Estimation of phytoplankton size fractions based on spectral features of remote sensing ocean color data. Journal of Geophysical Research, 118: 1-14.

Castro-Morales, K., Cassar, N., Shoosmith, D. R., Kaiser, J. 2013. Biological Production in the Bellingshausen Sea from oxygen-to-argon and oxygen triple isotopes. Biogeosciences, 10: 2273-2291.

Jean, M.-E., Cassar, N., Setzer, C., Bellenger, J.-P. 2012. Short-term N2 fixation kinetics in a moss-associated cyanobacteria.   Environmental Science & Technology, 46(16): 8667-8671.

Cassar, N., Bellenger, J.-P., Jackson, R. B., Karr, J., Barnett, B. A. 2012. N2 fixation in real-time by cavity ring-down laser absorption spectroscopy.  Oecologia: doi:10.1007/s00442-011-2105-y.

Bhattachan, A., D’Odorico, P., Baddock, M., Zobeck, T., Okin, G., Cassar, N. 2012. The Southern Kalahari: A potential new dust source in the southern hemisphere?  Environmental Research Letters:doi:10.1088/1748-9326/7/2/024001.

Huang, K., Ducklow, H., Vernet, M., Cassar, N., Bender, M. L. 2012. Export production and its regulating factors in the West Antarctic Peninsula region of the Southern OceanGlobal Biogeochemical Cycles: Vol. 26, GB2005, doi:10.1029/2010GB004028. 

Nevison, C. D., Keeling, R. F., Kahru, M., Manizza, M., Mitchell, B. G., Cassar, N. 2012. Estimating net community production in the Southern Ocean based on atmospheric potential oxygen and satellite ocean color dataGlobal Biogeochemical Cycles: Vol. 26, GB1020, doi:10.1029/2011GB004040.

Hamme, R. C., Cassar, N., Bender, M. L., Lance, V. P., Vaillancourt, R. D., Strutton, P. G., Moore, T. S., Ho, D. T., Hargreaves, B. R. 2012. Dissolved O2/Ar and other methods reveal rapid changes in productivity during a Lagrangian experiment in the Southern Ocean. Journal of Geophysical Research 117:doi:10.1029/2011JC007046. 

Bender, M. L., Kinter, S., Cassar, N., Wanninkhof, R. 2011. Evaluating gas exchange parameterizations using upper ocean radon distributions.  Geophysical Research Letters 116: C02010, doi:10.1029/2009JC005805.

Cassar, N., DiFiore, P., Barnett, B. A., Bender, M. L., Bowie, A. R., Tilbrook, B., Petrou, K., Westwood, K. J., Wright, S. W., Lefevre, D. 2011. The influence of iron and light availability on net community production in the subantarctic and polar frontal zones.  Biogeosciences 8: 227-237.

Stanley, R.H.R., Kirkpatrick, J.B., Cassar, N., Barnett, B.A., Bender, M. L. 2010. Net community production and gross primary production rates in the Western Equatorial Pacific. Global Biogeochemical Cycles. Vol. 24, GB4001, doi:10.1029/2009GB003651.

Marchetti, A. & Cassar, N. 2009. Iron-induced changes in diatom elemental stoichiometry and morphology: a brief review with potential paleoceanographic applications. Geobiology 7: 1-13.

Cassar, N., Barnett, B. A., Bender, M. L., Kaiser, J., Hamme, R. C., Tilbrook, B. 2009. Continuous high-frequency dissolved O2/Ar measurements by Equilibrator Inlet Mass Spectrometry (EIMS). Analytical Chemistry 81(5): 1855-1864.

Cassar, N., McKinley, G. A., Bender, M. L., Mika, R., Battle, M. 2008. An improved comparison of atmospheric Ar/N2 time-series and paired ocean-atmosphere models predictions.  J. Geophys. Res., 113, D21122, doi:10.1029/2008JD009817.

Nevison, C. D., Mahowald, N. M., Doney, S. C., Lima, I. D., Cassar, N. 2008. Impact of variable air-sea O2 and CO2 fluxes on atmospheric potential oxygen (APO) and land-ocean carbon sink partitioning. Biogeosciences 5: 875-889.

Cassar, N., Bender, M. L., Barnett, B. A., Fan, S., Moxim, W. J., Levy, H.II, Tilbrook, B. 2008. Response to Technical Comment by Boyd and Mackie. Science 319: 159b.

Cassar, N., Bender, M. L., Barnett, B. A., Fan, S., Moxim, W. J., Levy, H.II, Tilbrook, B. 2007. The Southern Ocean Biological Response to Aeolian Iron Deposition. Science 317:1067-1070.

Cassar, N. & Laws, E. A. 2007. The influence of β-carboxylation on photosynthetic carbon isotope fractionation in a marine diatom. Phycologia 46(3): 307-314.

Cassar, N., Laws, E. A, Popp, B. N. 2006. Carbon isotopic fractionation by the marine diatom Phaeodactylum tricornutum under nutrient and light- limited growth conditions. Geochimica etCosmochimica Acta 70 (21): 5323-5335.

Bender, M. L., Ho, D. T. Hendricks, M. B., Mika, R., Battle, M. O., Tans, P. P., Conway, T. J., Sturtevant, B., Cassar, N. 2005. Atmospheric O2/N2 changes, 1993-2002: implications for the partitioning of fossil fuel CO2 sequestration. Global Biogeochemical Cycles. Vol. 19, GB4017, doi:10.1029/2004GB002410.

Cassar, N., Laws, E. A., Bidigare, R. R., Popp, B. N. 2004. Bicarbonate uptake by Southern Ocean phytoplankton. Global Biogeochemical Cycles 18: 1-10.

Cassar, N. 2003. Carbon-Concentrating Mechanisms and b-Carboxylation: their potential contribution to Marine Photosynthetic Carbon Isotope Fractionation. Ph.D. Dissertation, School of Ocean and Earth Science and Technology, University of Hawaii. 222 pg.

Cassar, N., Laws, E. A., Popp, B. N., Bidigare, R. R. 2002. Sources of inorganic carbon for photosynthesis in a strain of Phaeodactylum tricornutum. Limnology and Oceanography 47: 1192-1197.

Laws, E. A., Popp, B. N., Cassar, N., and Tanimoto, J. 2002. 13C discrimination patterns in oceanic phytoplankton: The likely influence of CCMs and the implications for palaeoreconstructions. Functional Plant Biology 29: 1-11.

Berner, R.A., Petsch, S.T., Beerling, D.J., Popp, B.N., Lane, R.S., Laws, E.A., Westley, M.B., Cassar, N. Woodward, F.I., and Quick, W.P. 2000. Isotope fractionation and atmospheric oxygen: Implications forPhanerozoic O2 Evolution. Science 287: 1630-1633.

Vaugelas J. De, Meinesz A., Antolic B., Ballesteros E., Belsher T., Cassar N., Cecherelli G., Cinelli F.,Cottalorda J.M., Frada Orestano C., Grau A.M., Jaklin A., Morucci C., Relini M., Sandulli R., Span A., TripaldiG., Van Klaveren P., Zavodnik N. and Zuljevic A. 1999. Standardization  of map representation for the expansion of Caulerpa taxifolia in the Mediterranean sea. Oceanologica acta, 22 (1): 85-94.