Variation and Long-Term Trends in Tropospheric Methane (CH&lt;sub&gt;4&lt;/sub&gt;) Concentration over Japan Since 1986

道夫, 廣田; 之智, 堤; 行雄, 牧野; 徹, 佐々木; 祐二, 財前; 三和子, 池上

doi:10.2467/mripapers.49.43

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…A diaphragm pump was used to compress the sample air up to 1.8 kg cm −2 , and its CH 4 content was analyzed at the Meteorological Research Institute (MRI) after the campaign. The CH 4 mixing ratios were analyzed using a gas chromatograph equipped with a flame ionization detector (GC/FID) (Hirota et al, 1999). The precision in the GC/FID analysis was about 0.4%.…”

mentioning

confidence: 99%

Aircraft Observation of CO2, CO, O3 and H2 over the North Pacific during the PACE-7 Campaign

Sawa¹,

Matsueda²,

Makino³

et al. 2004

Tellus B

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A B S T R A C TAircraft observation under the Pacific Atmospheric Chemistry Experiment (PACE) program was performed from February 13 to 21, 2000 to examine in detail the distributions of CO 2 in the free troposphere between 5 and 11 km. Continuous measurements of CO 2 mixing ratios were made using an on-board measuring system over the northern North Pacific between Nagoya, Japan and Anchorage, Alaska, and the western North Pacific between Nagoya and Saipan. Other trace gases, such as CO and O 3 , were also observed using continuous measuring systems at the same time. CO 2 over the northern Pacific (35 • N and higher) showed highly variable mixing ratios, ranging from 374 ppm in the upper troposphere to 366 ppm in the lowermost stratosphere. This highly variable distribution of CO 2 was quite similar to that of CO, but the relationship between CO 2 and O 3 showed a strong negative correlation. These results indicated that the exchange process between the stratosphere and the troposphere significantly influences the large CO 2 variation. On the other hand, the CO 2 over the western North Pacific to the south of Japan showed no significant variation in the upper troposphere at 11 km but a relatively larger variability at 5 km. The CO 2 enhancement at lower altitudes coincided with the CO elevation due to the intrusion of a polluted air mass. Trajectory analysis indicated that the Asian continental outflow perturbed the CO 2 distributions over the western Pacific. Very low mixing ratios of O 3 of less than 20 ppb were distributed in the latitude band of 15-30 • N at 11 km, reflecting the effects of transport from the equatorial region.

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mentioning

confidence: 99%

Aircraft Observation of CO2, CO, O3 and H2 over the North Pacific during the PACE-7 Campaign

Sawa¹,

Matsueda²,

Makino³

et al. 2004

Tellus B

View full text Add to dashboard Cite

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Section: Study Areamentioning

confidence: 99%

Aircraft Observation of CO2, CO2 O3 and H2 over the North Pacific during the PACE-7 Campaign

Sawa¹,

Matsueda²,

Makino

et al. 2004

Tellus B: Chemical and Physical Meteorology

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A B S T R A C T Aircraft observation under the Pacific Atmospheric Chemistry Experiment (PACE) program was performed from February 13 to 21, 2000 to examine in detail the distributions of CO 2 in the free troposphere between 5 and 11 km. Continuous measurements of CO 2 mixing ratios were made using an on-board measuring system over the northern North Pacific between Nagoya, Japan and Anchorage, Alaska, and the western North Pacific between Nagoya and Saipan. Other trace gases, such as CO and O 3 , were also observed using continuous measuring systems at the same time. CO 2 over the northern Pacific (35 • N and higher) showed highly variable mixing ratios, ranging from 374 ppm in the upper troposphere to 366 ppm in the lowermost stratosphere. This highly variable distribution of CO 2 was quite similar to that of CO, but the relationship between CO 2 and O 3 showed a strong negative correlation. These results indicated that the exchange process between the stratosphere and the troposphere significantly influences the large CO 2 variation. On the other hand, the CO 2 over the western North Pacific to the south of Japan showed no significant variation in the upper troposphere at 11 km but a relatively larger variability at 5 km. The CO 2 enhancement at lower altitudes coincided with the CO elevation due to the intrusion of a polluted air mass. Trajectory analysis indicated that the Asian continental outflow perturbed the CO 2 distributions over the western Pacific. Very low mixing ratios of O 3 of less than 20 ppb were distributed in the latitude band of 15-30 • N at 11 km, reflecting the effects of transport from the equatorial region.

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Methane standard gases for atmospheric measurements at the MRI and JMA and intercomparison experiments

Matsueda¹,

Sawa²,

Wada³

et al. 2004

Pap. Met. Geophys.

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Variation and Long-Term Trends in Tropospheric Methane (CH<sub>4</sub>) Concentration over Japan Since 1986

Cited by 3 publications

References 16 publications

Aircraft Observation of CO2, CO, O3 and H2 over the North Pacific during the PACE-7 Campaign

Aircraft Observation of CO2, CO, O3 and H2 over the North Pacific during the PACE-7 Campaign

Aircraft Observation of CO<sub>2</sub>, CO<sub>2</sub> O<sub>3</sub> and H<sub>2</sub> over the North Pacific during the PACE-7 Campaign

Methane standard gases for atmospheric measurements at the MRI and JMA and intercomparison experiments

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