CTD and Water Chemistry data of the Eastern Pacific Redox Experiment of May - June 2000 (NODC Accession 0000833)

Frequently anticipated questions:

• What does this data set describe?
  1. How might this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  3. What similar or related data should the user be aware of?
• How reliable are the data; what problems remain in the data set?
  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How might this data set be cited?
   Dr. Frank Sansone, University of Hawaii, and Dr. Brian Popp, University of Hawaii, Unknown, CTD and Water Chemistry data of the Eastern Pacific Redox Experiment of May - June 2000 (NODC Accession 0000833): None None, unpublished material, unpublished material.

   Online Links:

   • https://www.ncei.noaa.gov/archive/accession/0000833

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -158.0

   East_Bounding_Coordinate: -98.0

   North_Bounding_Coordinate: 22.7

   South_Bounding_Coordinate: 15.0

3. What does it look like?
4. Does the data set describe conditions during a particular time period?

   Beginning_Date: 24-May-2000

   Beginning_Time: 0500

   Ending_Date: 28-Jun-2000

   Ending_Time: 1700

   Currentness_Reference: ground conditions

5. What is the general form of this data set?

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?
      
   2. What coordinate system is used to represent geographic features?
      
7. How does the data set describe geographic features?

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Dr. Frank Sansone, University of Hawaii
   • Dr. Brian Popp, University of Hawaii
2. Who also contributed to the data set?

   Dr. Frank Sansone Dr. Brian Popp Department of Oceanography School of Ocean Earth Science and Technology University of Hawaii at Manoa National Science Foundation Chemical Oceanography program

3. To whom should users address questions about the data?
   NOAA/National Oceanographic Data Center

   NODC User Services Group Leader

   SSMC3 Fourth Floor

   Silver Spring, Maryland
   

   USA

   301-713-3277 (voice)

   301-713-3302 (FAX)

   services@nodc.noaa.gov

   Hours_of_Service: 8:00 a.m. to 4:00 p.m. Monday Through Friday

   Contact_Instructions: Phone/FAX/e-mail

Why was the data set created?

The goal of EPREX was to determine the relative importance of each mechanism of nitrous oxide production across a range of biogeochemical conditions.

How was the data set created?

1. From what previous works were the data drawn?
2. How were the data generated, processed, and modified?

   Date: unknown (process 1 of 1)

   The EPREX consisted of a transect cruise with six stations spanning a range of biogeochemical conditions. At each station we collected water samples at depths ranging from the surface to 2000 meters. Oxygen was measured using Winkler titration (Grasshoff et al., 1983); nitrite was measured using colorimetry (Grasshoff et al., 1983); ammonium was measured using the fluorescence method of Jones (1991); and N2O was measured by headspace equilibration in a gas tight syringe, followed by packed-column gas chromatography using an electron capture detctor (Cohen, 1977). Nutrient samples, including nitrate, nitrite, and ammonium were collected in acid-washed plastic bottles and frozen for later analysis. Additional water samples were collected in glass serum bottles, preserved with mercuric chloride and sealed with gas tight septa for stable isotopic analysis of N2O in the mass spectrometry laboratory at the University of Hawaii. Person who carried out this activity:
   

   Dr. Frank Sansone

   Department of Oceanography School of Ocean Earth Science and Technology University of Hawaii at Manoa

   professor

   MSB 523

   Honolulu, Hawaii
   

   USA

   808-956-8370 (voice)

   sansone@hawaii.edu

   Data sources used in this process:

   • Cohen Y., 1977. Shipboard measurements of dissolved nitrous oxide in seawater by electron capture detector. Anal.Chem. 49:1238-1240. Dore J.E., Popp, B.N., Karl, D.M, and Sansone, F.J., 1988. A large source of atmospheric nitrous oxide from subtropical North Pacific surface waters. Nature 396:63-66. Grasshoff K., Ehrhardt M., and Kremling K, 1983. Methods of seawater analysis. Second Revised and Extended Edition. Verlog Chemie: pp. 61-72, 143-150. Jones R.D, 1991. An improved fluorescence method for the determination of nonmolar concentrations of ammonium in natural waters. Limnol. Oceanogr. 36(4) 814-819. Khalil M.A.K. and Rasmussen R.A, 1992. The global source of nitrous oxide. J. Geophys. Res. 97:14651-14660. Ledwell J.R., Watson A.J. and Law C.S., 1988 Mixing of a tracer in the pycnocline. J. Geophys. Res. 103:21499-21529

3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

1. How well have the observations been checked?
   
2. How accurate are the geographic locations?
   
3. How accurate are the heights or depths?
   
4. Where are the gaps in the data? What is missing?
   None
5. How consistent are the relationships among the observations, including topology?
   see methodology

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None

Use_Constraints: Dataset credit required

1. Who distributes the data set? (Distributor 1 of 1)
   
   NOAA/NESDIS/National Oceanographic Data Center

   Attn: Data Access Group, User Services Team

   SSMC-3 Fourth Floor

   Silver Spring, MD
   

   USA

   301-713-3277 (voice)

   301-713-3302 (FAX)

   services@nodc.noaa.gov

   Hours_of_Service: 8am-5pm, Monday through Friday

2. What's the catalog number I need to order this data set? Downloadable Data
3. What legal disclaimers am I supposed to read?

   NOAA makes no warranty regarding these data, expressed or implied, nor does the fact of distribution constitute such a warranty. NOAA and NODC cannot assume liability for any damages caused by any errors or omissions in these data, nor as a result of the failure of these data to function on a particular system.

4. How can I download or order the data?
   • Availability in digital form:

     Data format:	Excel and csv
     Network links:	https://accession.nodc.noaa.gov/833

   • Cost to order the data:
     Prices vary depending on data set, output medium and ordering mechanism. A standard handling charge, with additional costs for special handling, may be added to the basic cost of the data.

   • Special instructions:

     Prepayment by check, money order or bank card is required. Orders may be placed via fax, email, regular mail, telephone or via the NNDC Online Store.

Who wrote the metadata?

Dates:

Last modified: 06-Jan-2021
Last Reviewed: 05-Jan-2009

Metadata author:

Mr. Patrick C. Caldwell

NOAA/NESDIS/NODC/NCDDC

Hawaii/US Pacific Liaison

1000 Pope Road, MSB 316

Honolulu, Hawaii

USA

(808)-956-4105 (voice)

(808) 956-2352 (FAX)

caldwell@hawaii.edu

Hours_of_Service: 8 AM to 5 PM weekdays

Contact_Instructions: check services@nodc.noaa.gov if not available

Metadata standard:

FGDC CSDGM (FGDC-STD-001-1998)