116 measurements of pCO2 and TCO2, plus 145 and 98 measurements of ammonium concentration, were collected during the RRS Charles Darwin 114A research cruise. The data was gathered by scientists including Michel Frankignoulle and Xose Salgado Alvarez as part of the JGOFS and OMEX programs. The cruise took place from July 27 to August 11, 1998.
Use Cases
- Analyze the relationship between partial pressure of carbon dioxide (pCO2) and total inorganic carbon (TCO2) across the sampled water column.
- Model spatial and temporal variations in ammonium concentration from the two distinct measurement methods (filtration/autoanalysis and direct autoanalysis).
- Correlate carbon system parameters (pCO2, TCO2) with nutrient data (ammonium) to study biogeochemical coupling on the Iberian Slope.
- Validate regional ocean carbon models using in-situ pCO2 measurements from a specific time period (July/August 1998).
Strengths
- Provides 116 paired measurements for key carbon system variables (pCO2 and TCO2).
- Includes ammonium concentration data from two complementary analytical methods, totaling 243 measurements.
- Clear temporal (16-day cruise) and spatial (+42N to +43N, +9W) boundaries for the data collection.
Limitations
- Sample size is limited to a single, short-duration cruise with under 500 total data points.
- Data is over 25 years old (1998), limiting its use for contemporary ocean state analysis without complementary recent data.
- Unknown data quality flags, measurement precision, or detection limits for the reported concentrations.
Provenance
- Source
- Measurements by Michel Frankignoulle (carbon dioxide) and Xose Salgado Alvarez & Malcolm Woodward (ammonium) during the RRS Charles Darwin 114A cruise.
- Collection Method
- pCO2 and TCO2 computed from pH and alkalinity; ammonium measured by filtration with colorimetric autoanalysis and by direct colorimetric autoanalysis.
- Time Range
- 1998-07-27 to 1998-08-11
- Freshness
- Static dataset from a 1998 research cruise; no updates expected.
- Geography
- Iberian Slope, North-East Atlantic Ocean (approximately +42N to +43N latitude, +9W longitude).