Nitrogen sedimentary record

Montoya, J.P. (1994) Nitrogen isotope fractionation in the modern ocean implications for the sedimentary record. In Carbon Cycling in the Glacial Ocean Constraints on the Ocean s Role in Global Change (Zahn, R., Pedersen, T.F., Kaminski, M.A., and Labeyrie, L., eds.), pp. 259-280, Springe, Berlin. 

Altabet, M.A., and R. Francois. 1994. Sedimentary nitrogen isotopic ratio as a recorder for surface ocean nitrate utilization. Global Biogeochemical Cycles 8(1) 103-116. 

Figure 14.19 Records of c5 N, a denitrification proxy, from cores RC27-14 and RC27-23 (two middle panels), and of sedimentary nitrogen and total chlorin contents, proxies of productivity (upper panel), from RC27-23, compared with the G1SP2 c5 0 record (lower panel) for the past 65,000 years. Radiocarbon dates converted to calender years for the two cores are marked on the c5 N records. Numbers (1-18) on the bottom panel refer to Dansgaard—Oeschger events (from Altabet et ah,2002).

Altabet, M. A., and Francois, R. (1994). Sedimentary nitrogen isotopic ratio records surface ocean nitrate utilization. Global Biogeochem. Cycles 8, 103—116. 

The most common paleoceanographic proxy used to reconstmct past changes in the oceanic N cycle is the of total combustible, or bulk, sedimentary nitrogen (hereafter d Ntuik). Such measurements provide a record, with a variable degree of accuracy, of the N sinking out of the surface ocean at times past (Altabet and Francois,... 

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