Time and space variations of the
                        O&lt;sub&gt;2&lt;/sub&gt;/N&lt;sub&gt;2&lt;/sub&gt; ratio in the troposphere
                        over Japan and estimation of the global CO&lt;sub&gt;2&lt;/sub&gt; budget
                        for the period 2000–2010

Ishidoya, Shigeyuki; Aoki, Shuji; Goto, Daisuke; Nakazawa, Takakiyo; Taguchi, Shoichi; Patra, Prabir K.

doi:10.3402/tellusb.v64i0.18964

Cited by 36 publications

(43 citation statements)

References 47 publications

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“…A seasonal maximum (minimum) of APO appears in July (March), with a peak-to-peak seasonal amplitude of about 58 per meg. This is consistent with the seasonal APO cycle observed at Sendai (Ishidoya et al, 2012b). As described above, not only the airÁsea O 2 and N 2 fluxes but also various industrial processes could influence APO as defined by eq.…”

Section: Seasonal Cycles Of Apo and D(ar/n 2 )supporting

confidence: 77%

“…We also note discernable seasonal cycles of d(O 2 /N 2 ) and CO 2 , as indicated by the best-fitted curves. Seasonal maximum and minimum (minimum and maximum) of d(O 2 /N 2 ) (CO 2 concentration) appear in late July and early March, respectively, with peak-to-peak seasonal amplitudes of the d(O 2 /N 2 ) and CO 2 cycles of about 130 per meg and 14 ppm, respectively, which are close to 128922 per meg and 13.992.5 ppm, respectively, observed in the suburbs of Sendai (388N, 1408E), Japan, located about 300 km north of Tsukuba (Ishidoya et al, 2012b). Figure 11 shows a relationship between Dd(O 2 /N 2 ) and DCO 2 shown in Fig.…”

Section: Standard Air and Measurement Precisionmentioning

confidence: 99%

“…Since the observed peak-to-peak amplitude of the d(O 2 /N 2 ) seasonal cycle in the northern hemisphere mid-latitude is about 140 per meg (e.g. Tohjima et al, 2003;Ishidoya et al, 2012b), we need to apply a seasonal correction of about 2.0 per meg to the measured d(Ar/N 2 ). This correction is non-negligible.…”

Section: Measurement System and Proceduresmentioning

confidence: 99%

“…For this purpose, intense observations of the O 2 /N 2 ratio have been carried out since the early 1990s (Keeling and Shertz, 1992) at ground-based stations (e.g., Bender et al, 1996;Manning and Keeling, 2006;Tohjima et al, 2008;van der Laan-Luijkx et al, 2010;Ishidoya et al, 2012a), on oceanographic research/commercial vessels (Tohjima et al, 2005(Tohjima et al, , 2012Battle et al, 2006;Thompson et al, 2007), from aircraft in the free troposphere (e.g. Ishidoya et al, 2012b), and from a balloon-borne cryogenic air sampler in the stratosphere (Ishidoya et al, 2006.…”

Section: Introductionmentioning

confidence: 99%

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Development of a new high precision continuous measuring system for atmospheric O2/N2 and Ar/N2 and its application to the observation in Tsukuba, Japan

Ishidoya¹,

Murayama

2014

Tellus B: Chemical and Physical Meteorology

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A B S T R A C TA high precision continuous measurement system has been developed for analysis of the atmospheric O 2 /N 2 and Ar/N 2 ratios based on a mass spectrometry method. Sample and reference air flows through an inlet system and only a miniscule amount of each is transferred to the ion source of the mass spectrometer through thermally insulated thin fused silica capillaries. The measured O 2 /N 2 and Ar/N 2 values are experimentally corrected for the effects of pressure imbalance between the sample air and reference air during their introduction into the mass spectrometer, as well as for the influence of CO 2 concentration and O 2 /N 2 ratio of the sample air. Standard deviations of the measured O 2 /N 2 and Ar/N 2 ratios of standard air are 93.2 and 96.5 per meg, respectively, for our normal measurement time of 62 seconds. Our standard air is prepared by drying natural air and then stored in 48-L high-pressure cylinders; its O 2 /N 2 and Ar/N 2 ratios are stable to within 91.1 and 95.8 per meg, respectively, over a period of 11 months. The CO 2 /N 2 ratio is also simultaneously measured by this system, and converted to CO 2 concentration with a precision better than 90.3 ppm using an experimentally determined relationship. This system has been field tested in Tsukuba, Japan since February 2012. Preliminary results show clear seasonal cycles of atmospheric potential oxygen (APO 0O 2 '1.1)CO 2 ), as well as of Ar/N 2 . If we ignore the fossil fuel influence, then that part the seasonal APO cycle driven by the airÁsea heat flux accounts for 23% of the observed seasonal APO cycle, as estimated from the seasonal cycle of Ar/N 2 ; any residuals are attributed to ocean biology and ventilation.

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Section: Seasonal Cycles Of Apo and D(ar/n 2 )supporting

confidence: 77%

Section: Standard Air and Measurement Precisionmentioning

confidence: 99%

Section: Measurement System and Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of a new high precision continuous measuring system for atmospheric O2/N2 and Ar/N2 and its application to the observation in Tsukuba, Japan

Ishidoya¹,

Murayama

2014

Tellus B: Chemical and Physical Meteorology

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“…Bender et al, 2005;Manning and Keeling, 2006;Ishidoya et al, 2012aIshidoya et al, , 2012bTohjima et al, 2015). These observations revealed spatio-temporal variations in atmospheric δ(O 2 /N 2 ) and APO.…”

Section: Observation Site and Measurement Systemmentioning

confidence: 87%

Seasonal and short-term variations in atmospheric potential oxygen at Ny-Ålesund, Svalbard

Goto

Morimoto

Aoki

et al. 2017

Tellus B: Chemical and Physical Meteorology

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Oxygen in the atmosphere undergoes variations and changes in response to biospheric activities, ocean-atmosphere exchange and fossil fuel combustion. Continuous in situ measurements of atmospheric δ(O 2 /N 2 ) and CO 2 mole fraction were started at Ny-Ålesund, Svalbard (78.93°N, 11.83°E, 40 m a.s.l.) in November 2012. Atmospheric potential oxygen (APO) calculated from the measured O 2 and CO 2 values during November 2012-January 2015 show a clear seasonal cycle with a peak-to-peak amplitude of approximately 50 per meg. The seasonal cycle of APO simulated using an atmospheric transport model, with prescribed oceanic O 2 , N 2 and CO 2 fluxes at monthly time intervals, is in excellent agreement with the observed APO. However, in spring and early summer, high values of APO are observed irregularly on a timescale of hours to days. By comparing backward trajectories of air parcels released from the site with distributions of marine net primary production (NPP), and tagged tracer experiments made using the atmospheric transport model for APO, it is found that these high APO fluctuations are primarily attributable to O 2 emissions from the Greenland Sea, the Norwegian Sea and the Barents Sea, due to marine biological productivity. Marine net community production, estimated based on the sea-to-air O 2 flux derived from observed APO fluctuations, agrees with NPP obtained from satellite observations within an order of magnitude. The results obtained in this study have still some uncertainties, but our continuous observations of atmospheric δ(O 2 /N 2 ) and CO 2 mole fraction at Ny-Ålesund can play an important role in detecting possible changes in the carbon cycle in the near future.

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Terrestrial biospheric and oceanic CO₂ uptakes estimated from long‐term measurements of atmospheric CO₂ mole fraction, δ¹³C, and δ(O₂/N₂) at Ny‐Ålesund, Svalbard

et al. 2017

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Systematic observations of CO2 mole fraction, the isotopic ratio δ13C of CO2, and oxygen to nitrogen ratio (δ(O2/N2)) in the atmosphere have been carried out at Ny‐Ålesund, Svalbard, since 1991, 1996, and 2001, respectively. The CO2 mole fraction shows a clear seasonal cycle superimposed on a secular increase with an average rate of 2.0 ppm yr−1 for the period of 1996–2013. On the other hand, δ13C and δ(O2/N2) decrease secularly at an average rate of −0.020‰ yr−1 for 1996–2013 and −19.9 per meg yr−1 for 2001–2013, respectively. Based on the observed secular trends of the CO2 mole fraction and δ(O2/N2), the average CO2 uptake during 2001–2013 was estimated to be 1.6 ± 0.8 and 2.3 ± 0.5 GtC yr−1 for the terrestrial biosphere and the ocean, respectively. By using the observed CO2 and δ13C, the corresponding CO2 uptakes of 1.3 ± 0.6 and 2.6 ± 0.5 GtC yr−1 were obtained for the same period. The estimates from the two methods are in good agreement with each other. The terrestrial biospheric CO2 uptake derived by the latter method showed large interannual variability in association with El Niño events. On the other hand, the oceanic uptake increased secularly with less interannual variability during 1996–2013.

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Time and space variations of the O<sub>2</sub>/N<sub>2</sub> ratio in the troposphere over Japan and estimation of the global CO<sub>2</sub> budget for the period 2000–2010

Cited by 36 publications

References 47 publications

Development of a new high precision continuous measuring system for atmospheric O<sub>2</sub>/N<sub>2</sub> and Ar/N<sub>2</sub> and its application to the observation in Tsukuba, Japan

Development of a new high precision continuous measuring system for atmospheric O<sub>2</sub>/N<sub>2</sub> and Ar/N<sub>2</sub> and its application to the observation in Tsukuba, Japan

Seasonal and short-term variations in atmospheric potential oxygen at Ny-Ålesund, Svalbard

Terrestrial biospheric and oceanic CO₂ uptakes estimated from long‐term measurements of atmospheric CO₂ mole fraction, δ¹³C, and δ(O₂/N₂) at Ny‐Ålesund, Svalbard

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Time and space variations of the O<sub>2</sub>/N<sub>2</sub> ratio in the troposphere over Japan and estimation of the global CO<sub>2</sub> budget for the period 2000–2010

Cited by 36 publications

References 47 publications

Development of a new high precision continuous measuring system for atmospheric O<sub>2</sub>/N<sub>2</sub> and Ar/N<sub>2</sub> and its application to the observation in Tsukuba, Japan

Development of a new high precision continuous measuring system for atmospheric O<sub>2</sub>/N<sub>2</sub> and Ar/N<sub>2</sub> and its application to the observation in Tsukuba, Japan

Seasonal and short-term variations in atmospheric potential oxygen at Ny-Ålesund, Svalbard

Terrestrial biospheric and oceanic CO2 uptakes estimated from long‐term measurements of atmospheric CO2 mole fraction, δ13C, and δ(O2/N2) at Ny‐Ålesund, Svalbard

Contact Info

Product

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Terrestrial biospheric and oceanic CO₂ uptakes estimated from long‐term measurements of atmospheric CO₂ mole fraction, δ¹³C, and δ(O₂/N₂) at Ny‐Ålesund, Svalbard