# Santa Barbara Basin Bulk and Compound Specific Nitrogen Isotope Data #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite original publication, online resource and date accessed when using this data. # If there is no publication information, please cite Investigator, title, online resource and date accessed. # # Description/Documentation lines begin with # # Data lines have no # # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/ # Description: NOAA Landing Page # Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/batista2014/batista2014-aa.txt # Description: NOAA location of the template # # Archive: Paleoceanography # # Parameter_Keywords: nitrogen isotopes #--------------------------------------- # Contribution_Date # Date: 2017-06-13 #--------------------------------------- # File_Last_Modified_Date # Date: 2017-06-13 #--------------------------------------- # Title # Study_Name: Santa Barbara Basin Bulk and Compound Specific Nitrogen Isotope Data #--------------------------------------- # Investigators # Investigators: Batista, Fabian; Ravelo, A. C.; Crusius, J.; Casso, M. A.; McCarthy, M. D. #--------------------------------------- # Description_Notes_and_Keywords # Description: Bulk and compound specific nitrogen isotopes in shallow surface sediments from Santa Barbara Basin # Provided Keywords: Santa Barbara Basin, Nitrogen Isotopes, amino acids #--------------------------------------- # Publication # Authors: Batista, Fabian C., A. Christina Ravelo, John Crusius, Michael A. Casso, and Matthew D. McCarthy # Published_Date_or_Year: 2014 # Published_Title: Compound specific amino acid d15N in marine sediments: A new approach for studies of the marine nitrogen cycle # Journal_Name: Geochimica et Cosmochimica Acta # Volume: 142 # Edition: # Issue: # Pages: 553-569 # Report Number: # DOI: 10.1016/j.gca.2014.08.002 # Online_Resource: http://www.sciencedirect.com/science/article/pii/S0016703714004979 # Full_Citation: # Abstract: The nitrogen (N) isotopic composition (d15N) of bulk sedimentary N (d15Nbulk) is a common tool for studying past biogeochemical cycling in the paleoceanographic record. Empirical evidence suggests that natural fluctuations in the d15N of surface nutrient N are reflected in the d15N of exported planktonic biomass and in sedimentary d15Nbulk. However, d15Nbulk is an analysis of total combustible sedimentary N, and therefore also includes mixtures of N sources and/or selective removal or preservation of N-containing compounds. Compound-specific nitrogen isotope analyses of individual amino acids (d15NAA) are novel measurements with the potential to decouple d15N changes in nutrient N from trophic effects, two main processes that can influence d15Nbulk records. As a proof of concept study to examine how d15NAA can be applied in marine sedimentary systems, we compare the d15NAA signatures of surface and sinking POM sources with shallow surface sediments from the Santa Barbara Basin, a sub-oxic depositional environmental that exhibits excellent preservation of sedimentary organic matter. Our results demonstrate that d15NAA signatures of both planktonic biomass and sinking POM are well preserved in such surface sediments. However, we also observed an unexpected inverse correlation between d15N value of phenylalanine (d15NPhe; the best AA proxy for N isotopic value at the base of the food web) and calculated trophic position. We used a simple N isotope mass balance model to confirm that over long time scales, d15NPhe values should in fact be directly dependent on shifts in ecosystem trophic position. While this result may appear incongruent with current applications of d15NAA in food webs, it is consistent with expectations that paleoarchives will integrate N dynamics over much longer timescales. We therefore propose that for paleoceanographic applications, key d15NAA parameters are ecosystem trophic position, which determines relative partitioning of 15N into source AA versus trophic AA pools, and the integrated d15NAA of all common protein AA (d15NTHAA), which serves as a proxy for the d15N of nutrient N. Together, we suggest that these can provide a coupled picture of regime shifts in planktonic ecosystem structure, d15N at the base of food webs, and possibly additional information about nutrient dynamics. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: National Science Foundation # Grant: OCE-1131816 #--------------------------------------- # Site Information # Site_Name: Santa Barbara Basin # Location: California # Country: USA # Northernmost_Latitude: 34.216 # Southernmost_Latitude: 34.216 # Easternmost_Longitude: -120.017 # Westernmost_Longitude: -120.017 # Elevation: -588 #--------------------------------------- # Data_Collection # Collection_Name: Santa Barbara Amino Acid Batista14 # First_Year: # Last_Year: # Time_Unit: # Core_Length: 3.9 # Notes: #--------------------------------------- # Chronology_Information # Chronology: #--------------------------------------- # Variables # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab- 10 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data,additional info ## depth_m Water Depth,,,m,,,,,N, ## depth_cm Multicore Depth,,,cm,,,,,N, ## mol_ala Alanine,,,mole percent,,paleoceanography,,analytical technique: Gas Chromatography - Mass Spectrometry,N, ## mol_gly Glycine,,,mole percent,,paleoceanography,,analytical technique: Gas Chromatography - Mass Spectrometry,N, ## mol_thr Threonine,,,mole percent,,paleoceanography,,analytical technique: Gas Chromatography - Mass Spectrometry,N, ## mol_ser Serine,,,mole percent,,paleoceanography,,analytical technique: Gas Chromatography - Mass Spectrometry,N, ## mol_val Valine,,,mole percent,,paleoceanography,,analytical technique: Gas Chromatography - Mass Spectrometry,N, ## mol_leu Leucine,,,mole percent,,paleoceanography,,analytical technique: Gas Chromatography - Mass Spectrometry,N, ## mol_ile Isoleucine,,,mole percent,,paleoceanography,,analytical technique: Gas Chromatography - Mass Spectrometry,N, ## mol_pro Proline,,,mole percent,,paleoceanography,,analytical technique: Gas Chromatography - Mass Spectrometry,N, ## mol_asx Aspartic acid and Asparagine,,,mole percent,,paleoceanography,,analytical technique: Gas Chromatography - Mass Spectrometry,N, ## mol_glx Glutamic acid and Glutamine,,,mole percent,,paleoceanography,,analytical technique: Gas Chromatography - Mass Spectrometry,N, ## mol_phe Phenylalanine,,,mole percent,,paleoceanography,,analytical technique: Gas Chromatography - Mass Spectrometry,N, ## mol_tyr Tyrosine,,,mole percent,,paleoceanography,,analytical technique: Gas Chromatography - Mass Spectrometry,N, ## mol_lys Lysine,,,mole percent,,paleoceanography,,analytical technique: Gas Chromatography - Mass Spectrometry,N, #------------------------ # Data # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Value: -999 depth_m depth_cm mol_ala mol_gly mol_thr mol_ser mol_val mol_leu mol_ile mol_pro mol_asx mol_glx mol_phe mol_tyr mol_lys 30 -999 6.2 6.4 2 0.4 5.4 9.2 2.2 12.1 3.2 4.7 17.7 2.4 28 450 -999 6.2 6.4 2 0.5 5.4 9.2 2.2 12.2 3.2 4.7 17.6 2.5 28.1 -999 0 5.7 5.2 1.4 0.3 4.6 10.1 2.1 8.6 2.5 4.1 20.7 4.2 30.4 -999 1 5.8 5.9 1.5 0.3 4.9 10.3 2.2 9 2.4 3.9 22.2 4 27.5 -999 2 6.6 6.6 1.4 0.4 4.6 9.6 1.9 10 2.3 3.6 19.2 5.5 28.3 -999 3 6.6 13.1 2 3.4 6.2 9.8 3.3 9.1 1.5 1.7 8.9 2.9 31.6 -999 5 6.2 11.3 1.9 3.1 5.7 11.7 3.3 7.4 1.6 1.9 11.1 3.7 31 -999 7 6.2 11 1.2 2.3 5.9 9.1 3.1 9.7 2.2 1.6 6.3 1.8 39.7 -999 9 6.4 11.9 1.6 2.8 5.7 10.1 3 9.8 4.5 2.6 8.5 2.5 30.5 -999 11 6.1 10.1 1.3 2.2 5.4 10.7 2.8 8.9 4.4 3.1 8.8 2.8 33.2 -999 16 6.4 11.7 2 3 5.1 9.7 2.7 7.5 7.4 3.6 13.4 4.5 22.9 -999 22 5.9 10.6 1.9 2.9 4.7 7.4 2.3 6.4 6.3 3.1 9.9 2 36.5 -999 28 6 10.8 1.9 2.8 5 9 2.7 6.7 6.8 3.2 11.1 1.8 32.2 -999 34 6.2 10.9 2.1 2.9 5.3 9 2.6 6.9 6.4 3 11.3 2.5 30.7 -999 39 5.9 10.6 2.1 2.8 5 7.9 2.5 7.1 7.1 3.4 10.9 3.3 31.6