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Knudson, Karla P; Ravelo, Ana Christina (2017): Bering Sea nitrate utilization and stratification since 1.2 Ma analyzed at IODP Site 323-U1342 Holes A, C, and D [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.876202, Supplement to: Knudson, KP; Ravelo, AC (2015): Enhanced subarctic Pacific stratification and nutrient utilization during glacials over the last 1.2 Myr. Geophysical Research Letters, 42(22), 9870-9879, https://doi.org/10.1002/2015GL066317

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Published: 2017-06-13 • DOI registered: 2017-07-13

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Abstract:
The relationship between climate, biological productivity, and nutrient flux is of considerable interest in the subarctic Pacific, which represents an important high-nitrate, low-chlorophyll region. While previous studies suggest that changes in iron supply and/or physical ocean stratification could hypothetically explain orbital-scale fluctuations in subarctic Pacific nutrient utilization and productivity, previous records of nutrient utilization are too short to evaluate these relationships over many glacial-interglacial cycles. We present new, high-resolution records of sedimentary d15N, which offer the first opportunity to evaluate systematic, orbital-scale variations in subarctic Pacific nitrate utilization from 1.2 Ma. Nitrate utilization was enhanced during all glacials, varied with orbital-scale periodicity since the mid-Pleistocene transition, was strongly correlated with enhanced aeolian dust and low atmospheric CO2, but was not correlated with productivity. These results suggest that glacial stratification, rather than iron fertilization, systematically exerted an important regional control on nutrient utilization and air-sea carbon flux.
Related to:
Knudson, Karla P; Ravelo, Ana Christina (2015): North Pacific Intermediate Water circulation enhanced by the closure of the Bering Strait. Paleoceanography, 30(10), 1287-1304, https://doi.org/10.1002/2015PA002840
Project(s):
Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP)
Coverage:
Median Latitude: 55.237524 * Median Longitude: 178.006867 * South-bound Latitude: 54.828300 * West-bound Longitude: 176.916712 * North-bound Latitude: 57.556362 * East-bound Longitude: -175.816618
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

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Datasets listed in this publication series

  1. Knudson, KP; Ravelo, AC (2017): Difference calculations with isotope tracers (Delta d15N) from IODP Site 323-U1342 and 167-1012. https://doi.org/10.1594/PANGAEA.876199
  2. Knudson, KP; Ravelo, AC (2017): Bulk sediment nitrogen isotopes from IODP Site 323-U1342 Holes A, C, and D. https://doi.org/10.1594/PANGAEA.876200
  3. Knudson, KP; Ravelo, AC (2017): Nitrogen mass accumulation rate from different holes of IODP Site 323-U1342. https://doi.org/10.1594/PANGAEA.876201