New Century 2              

Metadata

Investigators
Name: Shin-ichiro Nakaoka

Organization: National Institute for Environmental Studies

Address: 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan

Phone: +81-29-850-2554

Email: nakaoka.shinichiro@nies.go.jp
Platform Type
Ship
Vessel Name
M/S New Century2
Geographical Coverage
North Pacific, North Atlantic
Ports of Call
Tahara

Balboa

Jacksonville

Newark

Cristobal

Long Beach

Benicia

others
Bounds
North: 60

West: 120

South: 6

East: -60
Method Sampling and Equilibrator Design
Description: Depth of Sea Water Intake: 7 (m)

Location of Sea Water Intake: bottom at stern

Equilibrator Type: Tandem Type Equilibrator

Equilibrator Volume: approx. 30L

Water Flow Rate: 20 L/min

Headspace Gas Flow Rate: 500 ml/min

Vented: Yes

Drying Method for CO2 in Water: Dehumidifier and Membrane Dryer
System Design/CO2 Sensor
Measurement Method: NDIR measurement of dry base xCO2 in seawater equilibrated air and atmosphere

Manufacturer: Kimoto Electric Co., Osaka, Japan.

Model: MOG-701 using LI-7000 CO2 Analyzer by LI-COR

Frequency: 10sec (except during calibration routines)

Accuracy of CO2 Water: 0.1ppm

Accuracy of CO2 Air: 0.1ppm

Precision of CO2 Water: 0.01ppm

Precision of CO2 Air: 0.01ppm

CO2 Sensor Calibration:

  Introducing CO2 standards to NIDR every 8 hours (10min each standard, 40 min. total) for air and 12 hours (15min each standard, 60 min total ) for seawater.

Manufacturer of CO2 calibration gases:

  Taiyo Nippon Sanso Corporation, Japan. All of the standard gases are certified by NIES laboratory as WMO traceable standards.

  CO2 gas concentrations are approximately 360, 380, 400, 420ppm for air, 270, 330, 390, 450ppm with non-CO2 gas as 0 ppm for seawater.
Method References/CO2 in Marine Air
Measurement: yes, every 10 seconds

Location and Height: 30m above sea level
Sea Surface Temperature
Location: 7m

Manufacturer: Sea-Bird Electronics. Inc.

Model: SBE38

Accuracy: 0.001 degC

Resolution: 0.00025 degC

Typical Stability: 0.001 degC

Calibration:

  Temperature sensor is calibrated by Sea-Bird Scientific every 4 years and confirmed that the calibrated equation is stable

  to measure temperature with accuracy of 0.05 deg C.
Sea Surface Salinity
Location: Equilibrator room

Manufacturer: Sea-Bird Electronics. Inc.

Model: SBE21 and SBE45

Accuracy: 0.005

Resolution: 0.0002

Typical Stability: 0.003

Calibration: SBE21 Salinity is calibrated by sal bottle value which is measured by Guildline Portable Salinometer 8410A.
Equilibrator Temperature
Location: Inlet of Equilibrator

Manufacturer: Sea-Bird Electronics. Inc.

Model: SBE38

Accuracy: 0.001 degC

Resolution: 0.00025 degC

Typical Stability: 0.001 degC

Calibration:

  Temperature sensor is calibrated by Sea-Bird Scientific every 4 years and confirmed that the calibrated equation is stable

  to measure temperature with accuracy of 0.05 deg C.
Equilibrator Pressure
Location: Ocean Observation Room

Manufacturer: COPAL electronics

Model: PG-200

Accuracy: 0.5hPa

Resolution: 0.1hPa

Other comments:

  Differential pressure gauge between Equilibrator and room periodically checked with observation room pressure.

  Calibration is performed every cruise.
Atmospheric Pressure
Location: Bridge above sea level (32m)

Manufacturer: COPAL electronics

Model: PG-200

Accuracy: 0.5 hPa

Resolution: 0.1 hPa

Calibration: Calibration is performed every 6 hours by JMA certified barometer.