@article {2696,
	title = {Aging and Molecular Changes of Dissolved Organic Matter Between Two Deep Oceanic End-Members},
	journal = {Global Biogeochemical Cycles},
	volume = {32},
	year = {2018},
	month = {Jan-10-2018},
	pages = {1449 - 1456},
	abstract = {The global ocean contains a massive reservoir of dissolved organic carbon (DOC), rivaling the atmosphere{\textquoteright}s pool of CO2. The most recalcitrant fractions have mean radiocarbon ages of ~4,000 years in the Atlantic to ~6,000 years in the Pacific. Knowing the radiocarbon signatures of DOC and the molecular composition of dissolved organic matter (DOM) is crucial to develop understanding of the persistence and lifetime of the DOC pool. In this research, we collected samples from the deep North Pacific in August 2013 (aboard the RV Melville) to couple the Δ14C content of solid-phase-extracted DOM (Δ14C-SPE-DOM) with its molecular composition in the ocean{\textquoteright}s oldest deep waters. We find that deep waters in this region held a mean Δ14C-SPE-DOM value of -554 {\textpm} 9{\textperthousand} (~6,400 14C years), substantially more depleted than that in the deep Atlantic, which held a mean Δ14C-SPE-DOM value of -445 {\textpm} 5{\textperthousand}. While we find a more degraded molecular composition of DOM in the deep Pacific than the deep Atlantic, the molecular formulae within the Island of Stability (Lechtenfeld et al., 2014, https://doi.org/10.1016/j.gca.2013.11.009), are largely retained. These results imply that a fraction of deep DOM is resistant to removal and present in both the deep Atlantic and Pacific Oceans.},
	doi = {10.1029/2017GB005854},
	url = {https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2017GB005854},
	author = {Bercovici, S. K. and Koch, B. P. and Lechtenfeld, O. J. and McCallister, S. L. and Schmitt-Kopplin, P. and Hansell, D. A.}
}
@article {1936,
	title = {Bioreactivity of estuarine dissolved organic matter: A combined geochemical and microbiological approach},
	journal = {Limnology and Oceanography},
	volume = {51},
	year = {2006},
	note = {040scTimes Cited:39
Cited References Count:32
},
	month = {Jan},
	pages = {94-100},
	abstract = {An integrated multidisciplinary study utilizing geochemical and microbial ecological approaches was conducted to characterize the origins, chemical nature, and quantities of dissolved and particulate organic matter (OM) utilized by heterotrophic bacteria in a temperate estuary. C: N, stable isotope (delta C-13), and lipid biomarker analyses revealed differences in the inferred reactivity of autochthonous versus allochthonous OM sources. Isotopic comparison of OM size fractions and bacterial nucleic acids suggests that high-molecular-weight dissolved OM (DOM) is consistently linked to bacterial biomass synthesis along the estuarine salinity gradient. Polyunsaturated fatty acids (as percent of total fatty acids, FA) were a reliable predictor of DOM decomposition in bioassays, thus providing an indicator directly linking DOM reactivity to its composition. Significant positive correlations between FA diagnostic of bacterial sources and lipid biomarker compounds diagnostic of planktonic origin indicate a systematic bacterial response to autochthonous DOM sources along the estuarine continuum. These findings further suggest that, although the geochemical signature of algal-derived OM in the dissolved phase may appear quantitatively insignificant, this fraction may nevertheless represent a principal source of bioreactive OM to heterotrophic bacteria in estuarine waters.},
	keywords = {acids, bacteria, bay, bioavailability, carbon-isotope analysis, extraction, food webs, sediments},
	isbn = {0024-3590},
	doi = {10.4319/lo.2006.51.1.0094},
	author = {McCallister, S. L. and Bauer, J. E. and Canuel, E. A.}
}
@article {1935,
	title = {Sources and potential transformation of estuarine dissolved and particulate organic matter: a multi-tracer approach},
	journal = {Organic Geochemistry},
	volume = {37},
	year = {2006},
	note = {id: 597},
	month = {2006},
	pages = {454-468},
	author = {McCallister, S. L. and Bauer, J. E. and Ducklow, H. W. and Canuel, E. A.}
}
@article {1982,
	title = {Effects of natural sunlight on decomposition of estuarine dissolved organic C, N and P and bacterial growth},
	journal = {Aquatic Microbial Ecology},
	volume = {40},
	year = {2005},
	note = {id: 1101},
	month = {2005},
	pages = {25-35},
	author = {McCallister, S. L. and Bauer, J. E. and Kelly, J. and Ducklow, H. W.}
}
@article {2038,
	title = {Assessing sources and agesof organic matter supporting river and estuarine bacterial production: a multiple isotope (Delta14C, delta13C and delta15N) approach},
	journal = {Limnology and Oceanography},
	volume = {49},
	year = {2004},
	note = {id: 1153},
	month = {2004},
	pages = {1687-1702},
	author = {McCallister, S. L. and Bauer, J. E. and Cherrier, J. C. and Ducklow, H. W.}
}
