@article {1937,
	title = {Dissolved and particulate organic matter source-age characterization in the upper and lower Chesapeake Bay: A combined isotope and biochemical approach},
	journal = {Limnology and Oceanography},
	volume = {51},
	year = {2006},
	note = {045nhTimes Cited:24
Cited References Count:37
},
	month = {May},
	pages = {1421-1431},
	abstract = {In order to characterize the sources and ages of organic matter contributing to river and estuarine outflow waters, the present study investigated Delta C-14 and delta C-13 signatures of the major operationally defined biochemical classes of ultrafiltered dissolved organic matter (UDOM) in conjunction with lipid biomarker and elemental compositions of UDOM and suspended particulate organic matter (POM) in the Chesapeake Bay. Freshwater (Susquehanna River) UDOM was dominated by a molecularly uncharacterized (MUC) fraction, followed by total carbohydrate (TCHO), total hydrolysable amino acid (THAA) and total lipid (TLE) components. In contrast, UDOM at the bay mouth (salinity similar to 22-24) was comprised mainly of TCHO, followed by MUC, THAA, and TLE. The Delta C-14 and delta C-13 signatures of both UDOM and its major biochemical classes indicate that Susquehanna DOM is derived in part from old allochthonous terrestrial sources, whereas young marine sources dominate at the bay mouth. In contrast to the other biochemical classes, lipophilic DOM at both sites was very old (similar to 5,000-7,000 years B.P.). In addition, factor analysis of lipid biomarker compounds revealed unique signatures for the UDOM and POM pools that imply disparate source and/or recycling properties as well as potential influences due to physical partitioning. Lipid biomarker compounds showed that although autochthonous riverine/estuarine sources dominated both the UDOM and POM pools, terrigenous lipids were elevated in the Susquehanna during high flow conditions. The presence of lipid biomarkers diagnostic of "fresh" algal material in UDOM further suggested its greater reactivity than POM. The observed biochemical and lipid biomarker compositions and isotopic signatures of UDOM and POM are consistent with previous findings suggesting that these two major organic matter pools have dissimilar reactivities and cycling times, and they derive from comparatively unique source-age materials in rivers and estuaries.},
	keywords = {biomarkers, carbon, delta-c-13, lipid-composition, ocean, radiocarbon, river, san-francisco, sediments, variability},
	isbn = {0024-3590},
	doi = {10.4319/lo.2006.51.3.1421},
	author = {Loh, A. N. and Bauer, J. E. and Canuel, E. A.}
}
@conference {1611,
	title = {Dissolved and particulate organic matter source-age characterization in river and estuarine outflow waters: a combined isotope and biochemical approach},
	booktitle = {ASLO Summer Meeting},
	year = {2005},
	note = {id: 482},
	month = {2005},
	address = {Santiago de Compostela, Spain},
	author = {Loh, A. N. and Bauer, J. E. and Canuel, E. A.}
}
@article {628,
	title = {Variable ageing and storage of dissolved organic components in the open ocean},
	journal = {Nature},
	volume = {430},
	year = {2004},
	note = {847daTimes Cited:93Cited References Count:30},
	month = {Aug 19},
	pages = {877-881},
	abstract = {Seawater dissolved organic matter (DOM) is the largest reservoir of exchangeable organic carbon in the ocean, comparable in quantity to atmospheric carbon dioxide(1,2). The composition, turnover times and fate of all but a few planktonic constituents of this material are, however, largely unknown(3,4). Models of ocean carbon cycling are thus limited by the need for information on temporal scales of carbon storage in DOM subcomponents, produced via the {\textquoteright}biological pump{\textquoteright}, relative to their recycling by bacteria(3,4). Here we show that carbohydrate- and protein-like substances in the open Atlantic and Pacific oceans, though often significantly aged, comprise younger fractions of the DOM, whereas dissolved lipophilic material exhibits up to similar to90 per cent fossil character. In contrast to the millennial mean ages of DOM observed throughout the water column, weighted mean turnover times of DOM in the surface ocean are only decadal in magnitude. An observed size-age continuum further demonstrates that small dissolved molecules are the most highly aged forms of organic matter, cycling much more slowly than larger, younger dissolved and particulate precursors, and directly links oceanic organic matter age and size with reactivity(3,5).},
	issn = {0028-0836},
	doi = {10.1038/nature02780},
	author = {Loh, A. N. and Bauer, J. E. and Druffel, E. R. M.}
}
