Partial pressure (or fugacity) of carbon dioxide, salinity and temperature collected from surface underway observations during R/V Rachel Carson and other commercial boat cruises in the Chesapeake Bay from 2016-05-04 to 2019-02-22 (NCEI Accession 0191507)
- University of DelawarePACKAGE DESCRIPTION: This dataset includes surface underway data collected during the R/V Rachel Carson and other commercial boat cruises in the Chesapeake Bay from 2016-05-04 to 2019-02-22. These data include partial pressure (or fugacity) of carbon dioxide in the water, sea surface salinity and sea surface temperature. The data are from the first bay-wide observational study of surface pCO2 and air-water CO2 flux along the main stem of the Chesapeake Bay. Four bay-wide cruises were conducted in the Chesapeake Bay on R/V Rachel Carson on May 4-6, June 6-10, August 8-12, and October 10-13, 2016, and one bay-wide cruise was on a commercial boat on February 21-22, 2019. The field research was supported by the U.S. National Oceanic and Atmospheric Administration, NOAA (NA15NOS4780190).
CITE AS: Chen, Baoshan; Cai, Wei-Jun (2019). Partial pressure (or fugacity) of carbon dioxide, salinity and temperature collected from surface underway observations during R/V Rachel Carson and other commercial boat cruises in the Chesapeake Bay from 2016-05-04 to 2019-02-22 (NCEI Accession 0191507). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/02vn-qe39. Accessed [date].
Surface measurement;Surface underway;
TEMPORAL COVERAGE:
SPATIAL COVERAGE:
GEOGRAPHIC NAMES:
PLATFORMS:
RESEARCH PROJECT(S):
VARIABLES / PARAMETERS:
| pCO2 (fCO2) autonomous | |
|---|---|
| Abbreviation: | fCO2_SW@SST |
| Unit: | micro-atmosphere |
| Observation type: | Surface underway |
| Measured or calculated: | Measured |
| Sampling instrument: | Seawater pump |
| Location of seawater intake: | Sea-chest of the boat |
| Analyzing instrument: | underway pCO2 system (AS-P2, Apollo SciTech) |
| Equilibrator type: | shower type equilibrator |
| Equilibrator volume: | 1 L (0.4 L water, 0.6 L headspace) |
| Is the equilibrator vented or not: | no |
| Water flow rate: | 3-4 L/min |
| Gas flow rate: | 100 mL/min |
| How was temperature inside the equilibrator measured: | A temperature sensor is located inside the equilibrator to record the equilibrator temperature |
| How was pressure inside the equilibrator measured: | A pressure sensor is connector to the top of the equilibrator to record the equilibrator pressure |
| Drying method for gas: | Gas stream passes through a thermoelectric condenser (~5 °C) and then through a Perma Pure (Nafion) dryer |
| SEA CO2 gas detector manufacturer: | LI-COR Inc. |
| SEA CO2 gas detector model: | LI-7000 |
| SEA CO2 gas detector resolution: | 0.01 microatmosphere |
| SEA CO2 gas detector uncertainty: | ± 0.5 microatmospheres |
| Standardization technique: | The pCO2 system was calibrated every 6-12 hours against four compressed CO2 gas standards (150.62, 404.72, 992.54, and 1984.82 ppm CO2 in air), which are traceable to the World Meteorological Organization (WMO) scale. |
| Standardization frequency: | 6-12 hours |
| Standard gas concentration: | 150.62, 404.72, 992.54, and 1984.82 ppm CO2 in air |
| Standard gas uncertainty: | ± 0.5 microatmospheres |
| Water vapor correction method: | the water vapor pressure of equilibration (units: atm) that can be calculated using salinity from the ship’s thermosalinograph and temperature of equilibration [Weiss and Price, 1980]. |
| Temperature correction method: | See Takahashi et al. (1993) |
| At what temperature was pCO2 reported: | in situ temperature |
| Uncertainty: | ± 2 micro-atmosphere |
| Quality flag convention: | 2=good, 3=questionable |
| Method reference: | Pierrot, D., Neill, C., Sullivan, K., Castle, R., Wanninkhof, R., Lüger, H., Johannessen, T., Olsen, A., Feely, R. A., & Cosca, C. E. (2009). Recommendations for autonomous underway pCO2 measuring systems and data-reduction routines. Deep Sea Research Part II: Topical Studies in Oceanography, 56(8-10), 512-522. https://doi.org/10.1016/j.dsr2.2008.12.005 |
| Researcher name: | Baoshan Chen |
| Researcher institution: | Schoool of Marine Science and Policy, University of Delaware, Newark, Delaware, 19711, USA |
| Mole fraction of carbon dioxide in dried gas | |
|---|---|
| Abbreviation: | xCO2_EQU |
| Unit: | ppm |
| Pressure inside the equilibrator | |
|---|---|
| Abbreviation: | PRES_EQU |
| Unit: | hPa |
| Temperature recorded from inside the equilibrator | |
|---|---|
| Abbreviation: | TEMP_EQU |
| Unit: | degree Celsius |
| Fugacity of seawater carbon dioxide after corrected to the in-situ sea surface temperature (feel free to report it as pCO2) | |
|---|---|
| Abbreviation: | fCO2_SW@SST |
| Unit: | micro-atmosphere |
| Uncertainty: | ± 2 micro-atmosphere |
| Sea Surface Temperature | |
|---|---|
| Abbreviation: | SST_C |
| Unit: | degrees celcius |
| Observation type: | Surface Underway |
| Analyzing instrument: | Sea-bird (SEB45) |
| Uncertainty: | Accuracy: ± 0.002; Precision: 0.0001 |
| Sea Surface Salinity | |
|---|---|
| Abbreviation: | SSS |
| Observation type: | Surface Underway |
| Analyzing instrument: | Sea-bird (SEB-45) |
| Uncertainty: | Accuracy: ± 0.005 ; Precision: 0.0002 |
SUBMITTED BY: Wei-Jun Cai (wcai@udel.edu)
SUBMISSION DATE: 2019-07-15
