Measurements of carbon dioxide in the Seto Inland Sea of Japan

Yamashita, Eiji; Fujiwara, Fukuichi; Liu, Xiaohu; Ohtaki, Eiji

doi:10.1007/bf02237462

Cited by 7 publications

(3 citation statements)

References 11 publications

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“…This approach has been widely used in the interpretation of pCO 2 data at daily scale (e.g. Oudot & Andrié, 1989;Yamashita, Fujiwara, Liu, & Ohtaki, 1993). The variation of pCO 2 (17°C) was smoother than the variation of pCO 2 at in situ temperature and throughout the experiment there was a general trend for pCO 2 to decrease.…”

Section: Methodsmentioning

confidence: 99%

Short-term variations of the partial pressure of CO2 in surface waters of the Galician upwelling system

Borges¹,

Frankignoulle²

2001

Progress in Oceanography

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The partial pressure of CO 2 (pCO 2 ) and dissolved oxygen saturation level (%O 2 ) were monitored continuously during a cruise in August 1998, which sampled surface waters off the Galician coast. Data are presented from two Lagrangian experiments carried out in an upwelling on the continental shelf and in the core of an offshore filament. The data show that daily variations in surface pCO 2 and oxygen (%O 2 ) were controlled by the diurnal cycle of primary production/respiration, temperature variations and air-sea exchange. Data obtained during various cross-shelf and crossfilament transects are also discussed and give an insight into the processes controlling large-scale variations of pCO 2 and %O 2 in the Galician upwelling system. These data suggest that upwelling filaments are an important feature of the inorganic carbon cycle of upwelling systems. However more field data in the various eastern boundary current systems worldwide are needed. 

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Section: Methodsmentioning

confidence: 99%

Short-term variations of the partial pressure of CO2 in surface waters of the Galician upwelling system

Borges¹,

Frankignoulle²

2001

Progress in Oceanography

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“…The pCO2 measurements for the same seawater could be repeated to within 3ppm . Details of the pCO2 instrument have been given in previous papers Yamashita et al, 1993). We would like to note here that the atmospheric pressure is assumed to be 1 atm, and the partial pressure of water vapor is assumed to be negligibly small compared with the atmospheric pressure.…”

Section: Methodsmentioning

confidence: 99%

Carbon Dioxide in Surface Seawaters of the Western Tropical Pacific Ocean

Ohtaki

Yamashita

Ishida

et al. 1995

Journal of the Meteorological Society of Japan

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“…The preferred method of making high resolution ( 1 ppmv) measurement of atmospheric carbon dioxide is by nondispersive infrared absorption [4][5][6]. Laboratory versions of instruments using this technique (e.g., Licor Model 7000) routinely reach precision levels of better than 0.5 ppm with 10 s time response.…”

Section: Introductionmentioning

confidence: 99%

Fluoropolymer-based capacitive carbon dioxide sensor

Kebabian¹,

Freedman²

2006

Meas. Sci. Technol.

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We describe a thin film sensor of carbon dioxide which relies on the change in capacitance of a fluoropolymer thin film caused by the difference in dielectric constants between air and carbon dioxide and by the preferred adsorption by the polymer of carbon dioxide compared to that of air. The fluoropolymer, Teflon AF 2400™, selectively adsorbs large quantities of CO2 with sufficient diffusivity to allow response times of a few seconds to be achieved. The sensor demonstrates completely linear response over its operating range from ppmv to 100% CO2. Sensor performance is currently limited by thermal drift and the need to remove all water vapour from the sample flow. Precision levels, currently at the level of 5–10 ppm, can be reduced to well below that of 1 ppm with proper redesign of the sensor. As part of these studies, the absolute solubilities of several compounds in Teflon AF 2400 were measured and are as follows (in units of µmoles cm−3 atm−1): air (16.6), CO2 (177), C2F6 (≈ 600), CF3CFH2 (≈ 800) and CF2ClCF2Cl (≈ 4500).

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Measurements of carbon dioxide in the Seto Inland Sea of Japan

Cited by 7 publications

References 11 publications

Short-term variations of the partial pressure of CO2 in surface waters of the Galician upwelling system

Short-term variations of the partial pressure of CO2 in surface waters of the Galician upwelling system

Carbon Dioxide in Surface Seawaters of the Western Tropical Pacific Ocean

Fluoropolymer-based capacitive carbon dioxide sensor

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