The Dual Isotopic Composition of Nitrate in the Gulf of Mexico and Florida Straits uri icon

abstract

  • AbstractThe Gulf of Mexico receives considerable riverine nutrient inputs that contribute to eutrophication of northern shelf waters. However, it is unclear whether a significant fraction of these riverine nutrients delivered to the Gulf of Mexico are subsequently exported from the Gulf, potentially influencing the chemistry of the North Atlantic. Here, we report the first dual isotopic composition (15N and 18O) measurements of nitrate (NO3) from three profiles collected in different years in the Gulf of Mexico, as well as a new profile from the Florida Straits. We compare these new measurements with prior measurements from the North and South Atlantic, as well as with the magnitude of riverine and other nitrogen fluxes to the Gulf of Mexico. We find that in the upper thermocline, NO3 15N measurements from the Gulf of Mexico are intermediate between prior measurements in the Sargasso Sea (lower in NO3 15N), and those from the South Atlantic (higher in NO3 15N), but are indistinguishable from Florida Straits and Sargasso Sea profiles on deeper isopycnal surfaces. There is little evidence for riverine NO3 influencing the isotopic composition of NO3 exported from the Gulf of Mexico, which, based on its 15N, would be expected to raise the 15N of shallow NO3. Lesser nitrogen fluxes are too small to significantly influence the isotopic composition of water column NO3 in the Gulf of Mexico. These results are consistent with recent modeling work suggesting that the majority of riverine nutrients are retained in the nearshore region.

published proceedings

  • Journal of Geophysical Research - Oceans

author list (cited authors)

  • Howe, S., Miranda, C., Hayes, C. T., Letscher, R. T., & Knapp, A. N.

complete list of authors

  • Howe, Samantha||Miranda, Carlos||Hayes, Christopher T||Letscher, Robert T||Knapp, Angela N