Title: Discoverer Surface Seawater pH and Total Ammonia

Contact:

   Patricia Quinn
   OCRD
   NOAA/Pacific Marine Environmental Laboratory
   7600 Sand Point Way NE
   Seattle, WA, USA, 98115
   Telephone: (206) 526-6892
   Facsimile: (206) 526-6744
   E-Mail Address: quinn@pmel.noaa.gov


Data Set Description:

ACE-1, Leg 2: Seawater pH and total ammonia (NHx(s) = NH3(s) + NH4+(s))
measured onboard the Discoverer by NOAA PMEL.

pH was measured with a spectrophotometric technique using an indicator dye
(Dickson, 1993, Mar. Chem., 44, 131 - 142).

NHx(s) was measured with a fluorescence method
(Jones, 1991, Limnol. Oceanogr., 36, 814-819).

The accuracy of the pH measurements is estimated to be +/- 0.005.
The uncertainty associated with the NHx(s) is estimated to be +/- 5 to 25%.

Codes used in the data set:

BDL, below the detection limit for NHx(s) of 0.005 uM.

Format: comma-delimited ASCII.
1, Date (YYYY/MM/DD) (UTC)
2, Time (HH:MM:SS) (UTC)
3, Time (UTC) - Julian Decimal Date
4, Latitude
5, Longitude
6, surface seawater pH
7, surface total ammonia concentration, NHx(s) = NH3(s) + NH4(s), in umolar


File Name Conventions:
   swphnh3.dat


References:
(Dickson, 1993, Mar. Chem., 44, 131 - 142).
(Jones, 1991, Limnol. Oceanogr., 36, 814-819).