Dataset: Nutrient and chlorophyll analyses from surface samples collected underway on board container ships during basin-wide transects of the North Pacific Ocean from Hong Kong to Long Beach, CA from 2009-2012

ValidatedFinal no updates expectedDOI: 10.26008/1912/bco-dmo.829141.1Version 1 (2020-11-16)Dataset Type:Cruise Results

Principal Investigator: Paul Quay (University of Washington)

Co-Principal Investigator, Contact: Hilary I. Palevsky (University of Washington)

BCO-DMO Data Manager: Dana Stuart Gerlach (Woods Hole Oceanographic Institution)

Project: North Pacific Surface Carbon, Oxygen and Isotope Measurements from Container Ships (2008-) (NPac Cont Ship)

Abstract

Surface nutrient and chlorophyll analyses were performed on samples collected on board commercial container ships from April 2009 through December 2012. Samples were collected from the underway seawater system during basin-wide transects of the North Pacific Ocean while traversing from Hong Kong to Long Beach, California.

Cite Dataset

Samples were collected from shipboard seawater intake (10 m depth) on basin-wide transects of the North Pacific between Hong Kong and Long Beach, California onboard the M/V OOCL Tianjin and the M/V OOCL Tokyo (each individual transect has a unique Cruise ID). Sea surface temperature and salinity at the time of sample collection were determined using a Sea-Bird Electronics SBE45 thermosalinograph installed in the ship’s seawater intake. To prevent biofouling that could cause respiration in the ship’s seawater lines [Juranek et al., 2010], intake lines between the anticorrosive sea chest and the sampling port were purged with bleach and freshwater between every cruise.  Since the samples were collected underway on a vessel moving ~24 knots and samples for all parameters were collected by a single shiprider, ship transit from the time that the location coordinates were recorded to the time of actual sampling could reflect a transit distance offset from the recorded location of up to 40 kilometers.

Details of collection event issues (dataset Notes field):

  • Missing info on duplicate:  A number of data entries are missing timestamp and location information for duplicates because separate times were not recorded at the time of collection.  Since the ship moves at ~24 knots, differences between the duplicate samples may represent real spatial variations between the times the duplicate samples were collected.
  • Intake temp issue:  The intake temperature was not working until 2010-02-17 on the TJ9 cruise, so 23 of the reported temperatures are derived from TSG -0.3 (approximate correction for inline warming)
  • Missing TSG data and/or GPS signal: On the Tokyo_0 cruise, 7 entries are missing TSG data and 2 additional are missing GPS information as well as TSG data. 
  • No GPS data: On the Tianjin_1 cruise, six entries did not have GPS available.

Related Datasets

No Related Datasets

Related Publications

Methods
Clayton, S., Palevsky, H. I., Thompson, L., & Quay, P. D. (2021). Synoptic Mesoscale to Basin Scale Variability in Biological Productivity and Chlorophyll in the Kuroshio Extension Region. Journal of Geophysical Research: Oceans, 126(11). Portico. https://doi.org/10.1029/2021jc017782
Methods
Gordon, L. I., J. C. Jennings, JR, A. A. Ross, and J. M. Krest. (1994). A suggested protocol for continuous flow analysis of seawater nutrients (phosphate, nitrate, nitrite, and silicic acid) in the WOCE Hydrographic Program and the Joint Global Ocean Fluxes Study. WHP Office Report 91-1. Revision 1, Nov. 1994. WOCE Hydrographic Program Office, Woods Hole, MA.
Methods
Juranek, L. W., Hamme, R. C., Kaiser, J., Wanninkhof, R., & Quay, P. D. (2010). Evidence of O2 consumption in underway seawater lines: Implications for air-sea O2 and CO2 fluxes. Geophysical Research Letters, 37(1), n/a–n/a. doi:10.1029/2009gl040423

Palevsky, H. I., Quay, P. (2021) Nutrient and chlorophyll analyses from surface samples collected underway on board container ships during basin-wide transects of the North Pacific Ocean from Hong Kong to Long Beach, CA from 2009-2012. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2020-11-16 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.829141.1 [access date]

Terms of Use

This dataset is licensed under Creative Commons Attribution 4.0.


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Funded by the U.S. National Science Foundation