Hydrographic, nutrient, and carbonate system data from R/V Janan cruises in the Arabian Gulf in December 2018 and May 2019 (NCEI Accession 0278709)
This dataset contains chemical and physical data collected on R/V Janan during cruises Janan_20181205 and Janan_20190518 in the Persian Gulf (Gulf of Iran) from 2018-12-05 to 2019-05-18. These data include Nitrate, Partial pressure of CO2, Silicate, depth, dissolved Oxygen, dissolved inorganic Carbon, pH, salinity calculated from CTD primary sensors, total alkalinity (TA), and water temperature. The instruments used to collect these data include Automatic titrator, CTD Sea-Bird 911, Inductively Coupled Plasma Optical Emission Spectrometer, MARIANDA VINDTA 3C total inorganic carbon and titration alkalinity analyser, Niskin bottle, Sea-Bird SBE 27 pH/O.R.P. sensor, and Sea-Bird SBE 43 Dissolved Oxygen Sensor. These data were collected by Oguz Yigiterhan of Qatar University and Dr James W. Murray of University of Washington as part of the "Carbonate System Chemistry in the Arabian Gulf (Arabian Gulf CO2)" project. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2022-01-27.
The following is the text of the dataset description provided by BCO-DMO:
Dataset Description:
Hydrographic, nutrient and carbonate system data was collected aboard the R/V Janan on two single day cruises in the Arabian Gulf.
The following is the text of the dataset description provided by BCO-DMO:
Dataset Description:
Hydrographic, nutrient and carbonate system data was collected aboard the R/V Janan on two single day cruises in the Arabian Gulf.
Dataset Citation
- Cite as: Murray, James W.; Yigiterhan, Oguz (2023). Hydrographic, nutrient, and carbonate system data from R/V Janan cruises in the Arabian Gulf in December 2018 and May 2019 (NCEI Accession 0278709). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0278709. Accessed [date].
Dataset Identifiers
ISO 19115-2 Metadata
gov.noaa.nodc:0278709
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NOAA National Centers for Environmental Information +1-301-713-3277 NCEI.Info@noaa.gov |
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NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Time Period | 2018-12-05 to 2019-05-18 |
Spatial Bounding Box Coordinates |
West: 51.749
East: 52.538
South: 25.486
North: 26.225
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Dataset Progress Status | Complete - production of the data has been completed Historical archive - data has been stored in an offline storage facility |
Data Update Frequency | As needed |
Supplemental Information | Acquisition Description: Sampling Water column sampling using rosette mounted 10-L PVC Niskin bottles was conducted on December 5, 2018 and May 18, 2019 in the Arabian Gulf on the R/V Janan (Figure 1). Surface water samples and hydrographic data were collected at seven stations (stations 1C, 2C, 3C, 4C, 5C, 6B, 6C) along a transect from the central east coast of Qatar across the Qatari Exclusive Economic Zone (EEZ). Stations were chosen to be nearly perpendicular to the major axis of the Gulf to capture main regional hydrographic features across the EEZ. The transect provides a reasonable representation of hydrographic distributions across the wider part of the Gulf. Samples were collected in triplicate at each station. Vertical profiles with one surface sample, one bottom sample, and 1 to 3 mid-depth samples were collected at stations 2C, 4C, 6B, and 6C. Samples for DIC and total alkalinity were collected in 300 mL Wheaton BOD glass bottles with ground glass stoppers. Samples were sealed immediately after collection to prevent loss of CO 2 . Samples were poisoned with 50 µL HgCl 2 (0.05% by volume) to prevent biological activity, then covered with aluminum foil to eliminate light and biological growth. Analysis The best approach for understanding ocean acidification is to measure the primary capacity factors of the carbonate system chemistry which are dissolved inorganic carbon (DIC) and total alkalinity (TAlk). DIC and alkalinity are the best set of parameters use for calculating pH, pCO 2 and carbonate ion, because they are conservative properties during water mass mixing. After collection, samples were shipped to the University of Washington for DIC and TAlk analyses in Dr. Alex Gagnon’s laboratory. Carbonate system measurements follow the methods of Dickson et al. (2007). Briefly, TAlk (μmol kg -1 ) was determined through open-cell automated titration (876 Dosimat plus, Metrohm AG) with a solution of 0.1M hydrochloric acid (HCl)+0.6M sodium chloride (NaCl). Total DIC (μmol/kg) was obtained through coulometric determination (VINDTA 3D, Marianda with UIC coulometer). Certified reference materials for TAlk and DIC obtained from Andrew Dickson (Scripps Institution of Oceanography) were run in conjunction with seawater samples as a calibration standard and to monitor precision. Long-term precision for DIC and TAlk in this lab, based on repeated measurements of CRM materials, was ± 3.7 μmol kg -1 (2σ std. dev.) and ± 4.3 μmol kg -1 (2σ std. dev.), respectively (Bolden et al., 2019). pCO 2 and pH were calculated from DIC and Alk using CO2Calc using the total pH scale with carbonate equilibrium constants refit from Mehrbach et al. (1973) by Dickson and Millero (1987); borate alkalinity was calculated using the boron/chlorinity (salinity) relationship provided by Lee et al. (2010) and equilibrium constants from Dickson (1990). Where necessary, NTAlk, and NDIC values used in subsequent calculations were salinity-normalized to a mean salinity value of 40.0. Data analysis was executed using Microsoft Excel. Certain data properties were calculated using CO 2 Calc. This includes parameters such as pH, CO 3 2- , and pCO 2 . During both cruises, samples were also collected and analyzed for: Hydrographic properties using a SeaBird Electronics, SBE 911 on a CTD SeaBird rosette (T, S, O 2 , pH, % Transmission and fluorescence). The pH sensor used in our project is the SBE 27 pH/O.R.P (Redox) Sensor. Dissolved oxygen was measured using the SBE 43 Dissolved Oxygen sensor. Additional discrete samples were analyzed for dissolved oxygen within a few hours of collection using the titrimetric method (Winkler, 1888). Nutrients (NO 3 , NO 2 , NH 4 , PO 4 , and Si) and chlorophyll were analyzed on filtered samples using classical techniques (Parsons et al., 1984). Suspended particulate matter for particulate Ca analyses was sampled using 47 mm filter holders and 0.45 µM mesh size Nuclepore filters. Filtration volumes of 2 L, provided sufficient samples for analyses. Particulate samples were acid digested in a clean lab on hot plates using trace metal grade concentrated HF (16.5M), HCl (6M) and, HNO 3 (16M) acids (Yigiterhan and Murray, 2008; Yigiterhan et al., 2011, Yigiterhan et al., 2018). H 2 O 2 was added for complete removal of the organic material. The elemental analyses were performed using ICP-OES. |
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Last Modified: 2023-07-24T15:37:46Z
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For questions about the information on this page, please email: ncei.info@noaa.gov