Analysis of ΔO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;/ΔCO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; ratios for the pollution events observed at Hateruma Island, Japan

Minejima, Chika; Kubo, M. Κ.; Tohjima, Yasunori; Yamagishi, Hiroshi; Koyama, Yosuke; Maksyutov, Shamil; Kita, K.; Mukai, Hirofumi

doi:10.5194/acp-12-2713-2012

Cited by 19 publications

(17 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The estimated uncertainty of the O 2 /N 2 scale stability (±0.45 per meg yr −1 ) discussed in Sect. 2.3, the uncertainty of the O 2 /N 2 span sensitivity (±3 %) and the uncertainty in the globally averaged APO associated with the limited atmospheric sampling (±0.2 PgC yr −1 ) discussed in Nevison et al (2008) were also included in the calculation of the uncertainties in APO. The uncertainties of α B and α F were ±0.10 (Keeling and Manning, 2014) and ±0.04 (Tohjma et al, 2008), respectively.…”

Section: Calculation Of Global Carbon Budgetsmentioning

confidence: 99%

“…Probably, an imbalance of the air-sea seasonal O 2 exchanges, outgassing flux associated with primary production in spring and summer, and ingassing flux associated with ocean ventilation in autumn and winter cause the interannual variations in Z. The results of ocean model simulations also support this mechanism (e.g., McKinley et al, 2003;Nevison et al, 2008). Therefore, it is difficult to estimate the shortterm carbon budgets unless the temporal variations in Z are accurately evaluated.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Global carbon budgets estimated from atmospheric O2∕N2 and CO2 observations in the western Pacific region over a 15-year period

et al. 2019

View full text Add to dashboard Cite

Abstract. Time series of the atmospheric O2∕N2 ratio and CO2 mole fraction of flask samples obtained from the National Institute for Environmental Studies' (NIES's) flask sampling network are presented. The network includes two ground sites, Hateruma island (HAT; 24.05∘ N, 123.81∘ E) and Cape Ochiishi (COI; 43.17∘ N, 145.50∘ E), and cargo ships regularly sailing in the western Pacific. Based on temporal changes in fossil-fuel-derived CO2 emissions, global atmospheric CO2 burden and atmospheric potential oxygen (APO), which were calculated from the observed O2∕N2 ratio and CO2 mole fraction according to APO = O2+1.1×CO2, we estimated the global carbon sinks of the ocean and land biosphere for a period of more than 15 years. In this carbon budget calculation, we adopted a correction for the time-varying ocean O2 outgassing effect with an average of 0.54 PgC yr−1 for 2000–2016. The outgassing effect, attributed mainly to global ocean warming, was evaluated under the assumption that the net ocean gas flux is proportional to the change in the ocean heat content for the 0–2000 m layer. The resulting oceanic and land biotic carbon sinks were 2.6±0.7 and 1.5±0.9 PgC yr−1, respectively, for a 17-year period (2000–2016) and 2.4±0.7 and 1.9±0.9 PgC yr−1, respectively, for a 14-year period (2003–2016). Despite the independent approaches, the sink values of this study agreed with those estimated by the Global Carbon Project (GCP) within a difference of about ±0.4 PgC yr−1. We examined the carbon sinks for an interval of 5 years to assess the temporal trends. The pentad (5-year) ocean sinks showed an increasing trend at a rate of 0.08±0.02 PgC yr−2 during 2001–2014, while the pentad land sinks showed an increasing trend at a rate of 0.23±0.04 PgC yr−2 for 2001–2009 and a decreasing trend at a rate of -0.22±0.04 PgC yr−2 during 2009–2014. Although there is good agreement in the trends of the pentad sinks between this study and that of GCP, the increasing rate of the pentad ocean sinks of this study was about 2 times larger than that of GCP.

show abstract

Section: Calculation Of Global Carbon Budgetsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Global carbon budgets estimated from atmospheric O2∕N2 and CO2 observations in the western Pacific region over a 15-year period

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Goto et al 2017) and fossil fuel emissions (e.g. Minejima et al 2012). To observe the O 2 /N 2 ratio continuously, a commercially available fuel cell analyzer (Sable Systems, Oxzilla FC-II) has been widely used in recent studies (e.g.…”

Section: Introductionmentioning

confidence: 99%

Development of a Continuous Measurement System for Atmospheric O2/N2 Ratio Using a Paramagnetic Analyzer and Its Application in Minamitorishima Island, Japan

Ishidoya

Tsuboi²,

Murayama

et al. 2017

SOLA

View full text Add to dashboard Cite

A continuous measuring system for atmospheric O 2 /N 2 ratio was developed employing a paramagnetic oxygen analyzer. Sample air is allowed to flow through a water trap cooled to −80°C, and is introduced into the analyzer at a flow rate of 100 mL min −1 by stabilizing the pressure to an order of 10 −1 Pa. The analytical reproducibility of the O 2 /N 2 ratio achieved by the system is about 5 and 3 per meg for 2 and 30 minutes average values, respectively. The O 2 /N 2 ratio values obtained by the system are in good agreement with the values obtained by our traditional system using a mass spectrometer. Using our new system, we started measuring the atmospheric O 2 /N 2 ratio at Minamitorishima, Japan since December, 2015. Some preliminary results show clearly the O 2 /N 2 day-to-day and seasonal variations that are in the opposite phase with the CO 2 concentration.(Citation: Ishidoya, S

show abstract

“…Piao et al (2008) suggested that the Northern Hemisphere terrestrial biosphere may be sequestering less carbon than previously thought, due to an increase in carbon losses during autumn, resulting from the strong dependence of respiration to rising temperatures; this conclusion was drawn from detrended atmospheric CO 2 data derived using a single digital filtering program . More recently, Minejima et al (2012) investigated the origin of pollution events at a Japanese island site that were identified from detrended atmospheric O 2 and CO 2 data using the Thoning et al (1989) program only.…”

mentioning

confidence: 99%

Investigating bias in the application of curve fitting programs to atmospheric time series

Pickers

Manning

2015

Atmos. Meas. Tech.

View full text Add to dashboard Cite

Abstract. The decomposition of an atmospheric time series into its constituent parts is an essential tool for identifying and isolating variations of interest from a data set, and is widely used to obtain information about sources, sinks and trends in climatically important gases. Such procedures involve fitting appropriate mathematical functions to the data. However, it has been demonstrated that the application of such curve fitting procedures can introduce bias, and thus influence the scientific interpretation of the data sets. We investigate the potential for bias associated with the application of three curve fitting programs, known as HPspline, CCGCRV and STL, using multi-year records of CO 2 , CH 4 and O 3 data from three atmospheric monitoring field stations. These three curve fitting programs are widely used within the greenhouse gas measurement community to analyse atmospheric time series, but have not previously been compared extensively.The programs were rigorously tested for their ability to accurately represent the salient features of atmospheric time series, their ability to cope with outliers and gaps in the data, and for sensitivity to the values used for the input parameters needed for each program. We find that the programs can produce significantly different curve fits, and these curve fits can be dependent on the input parameters selected. There are notable differences between the results produced by the three programs for many of the decomposed components of the time series, such as the representation of seasonal cycle characteristics and the long-term (multi-year) growth rate. The programs also vary significantly in their response to gaps and outliers in the time series. Overall, we found that none of the three programs were superior, and that each program had its strengths and weaknesses. Thus, we provide a list of recommendations on the appropriate use of these three curve fitting programs for certain types of data sets, and for certain types of analyses and applications. In addition, we recommend that sensitivity tests are performed in any study using curve fitting programs, to ensure that results are not unduly influenced by the input smoothing parameters chosen.Our findings also have implications for previous studies that have relied on a single curve fitting program to interpret atmospheric time series measurements. This is demonstrated by using two other curve fitting programs to replicate work in Piao et al. (2008) on zero-crossing analyses of atmospheric CO 2 seasonal cycles to investigate terrestrial biosphere changes. We highlight the importance of using more than one program, to ensure results are consistent, reproducible, and free from bias.

show abstract

Analysis of ΔO<sub>2</sub>/ΔCO<sub>2</sub> ratios for the pollution events observed at Hateruma Island, Japan

Cited by 19 publications

References 29 publications

Global carbon budgets estimated from atmospheric O<sub>2</sub>∕N<sub>2</sub> and CO<sub>2</sub> observations in the western Pacific region over a 15-year period

Global carbon budgets estimated from atmospheric O<sub>2</sub>∕N<sub>2</sub> and CO<sub>2</sub> observations in the western Pacific region over a 15-year period

Development of a Continuous Measurement System for Atmospheric O<sub>2</sub>/N<sub>2</sub> Ratio Using a Paramagnetic Analyzer and Its Application in Minamitorishima Island, Japan

Investigating bias in the application of curve fitting programs to atmospheric time series

Contact Info

Product

Resources

About

Analysis of ΔO&lt;sub&gt;2&lt;/sub&gt;/ΔCO&lt;sub&gt;2&lt;/sub&gt; ratios for the pollution events observed at Hateruma Island, Japan

Cited by 19 publications

References 29 publications

Global carbon budgets estimated from atmospheric O&lt;sub&gt;2&lt;/sub&gt;∕N&lt;sub&gt;2&lt;/sub&gt; and CO&lt;sub&gt;2&lt;/sub&gt; observations in the western Pacific region over a 15-year period

Global carbon budgets estimated from atmospheric O&lt;sub&gt;2&lt;/sub&gt;∕N&lt;sub&gt;2&lt;/sub&gt; and CO&lt;sub&gt;2&lt;/sub&gt; observations in the western Pacific region over a 15-year period

Development of a Continuous Measurement System for Atmospheric O<sub>2</sub>/N<sub>2</sub> Ratio Using a Paramagnetic Analyzer and Its Application in Minamitorishima Island, Japan

Investigating bias in the application of curve fitting programs to atmospheric time series

Contact Info

Product

Resources

About

Analysis of ΔO<sub>2</sub>/ΔCO<sub>2</sub> ratios for the pollution events observed at Hateruma Island, Japan

Global carbon budgets estimated from atmospheric O<sub>2</sub>∕N<sub>2</sub> and CO<sub>2</sub> observations in the western Pacific region over a 15-year period

Global carbon budgets estimated from atmospheric O<sub>2</sub>∕N<sub>2</sub> and CO<sub>2</sub> observations in the western Pacific region over a 15-year period