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7 results for “halocarbon emissions”
Atmospheric Halocarbon Observations at Beromünster, Switzerland, and Bayesian Inverse Modeling to assess Emissions
<p>Atmospheric halocarbon (CFCs, halons, HCFCs, HFCs, PFCs, SF<sub>6</sub>, NF<sub>3</sub>, HFOs) and carbon monoxide (CO) observations (mole fractions) from the tall tower site at Beromünster, Switzerland (47.2 °N, 8.2 °E, 797 m a.s.l., 212 m a.g.l.), covering the period September 2019 to September 2020. The halocarbon measurements were conducted using a Medusa pre-concentration unit, coupled to gas chromatography (Agilent 6890N) and mass spectrometry (Agilent 5975, GC-MS).</p> <p>For further details see: Miller, B. R., Weiss, R. F., Salameh, P. K., Tanhua, T., Greally, B. R., Mühle, J., and Simmonds, P. G.: Medusa: A Sample Preconcentration and GC/MS Detector System for in Situ Measurements of Atmospheric Trace Halocarbons, Hydrocarbons, and Sulfur Compounds, Anal. Chem., 80, 1536–1545, https://doi.org/10.1021/ac702084k, 2008).</p> <p>The data format follows that used within the AGAGE network (see AGAGE data archive: <a href="http://agage.mit.edu/data/agage-data">http://agage.mit.edu/data/agage-data</a>).</p> <p>Data results for the Bayesian inversion conducted based on the measurement data from Beromünster to assess Swiss halocarbon emissions. Files are provided in netCDF format for the 28 individual substances discussed in (Rust, D. et al., 2022, <em>Swiss halocarbon emissions for 2019 to 2020 assessed from regional atmospheric observations</em>, Atmospheric Chemistry and Physics). Each file contains the a priori and a posteriori emissions as used or calculated in the Bayesian inversion. Data are provided on the grid used in the inversion (irregular longitude/latitude). Metadata are included as netCDF attributes. The netCDF files follow the CF conventions and are readable with any netcdf interface/tool.</p>
Fig. 3 in Halocarbon emissions by selected tropical seaweeds exposed to different temperatures
Fig. 3. Average emission rates of halocarbons ± standard deviation (pmol gFW 1 h 1; n = 4) for the four seaweeds, G. manilaensis, U. reticulata, K. alvareii and T. conoides after 4- and 28-h exposure to the 25 ◦ C ambient temperature or the treatment temperature levels of 40, 35, 30 and 20 ◦ C. a,b,c indicate homogeneous groups based on Tukey's post hoc test (p <0.05).
Fig. 2 in Halocarbon emissions by selected tropical seaweeds exposed to different temperatures
Fig. 2. PCA analysis based on log10 of the halocarbon emissions by the four selected seaweeds, G. manilaensis, U. reticulata, K. alvarezii and T. conoides, exposed to ambient temperature ○, and exposed to treatment temperatures of 40, 35, 30, 25 and 20◦ C for 4 △ and 28 ★ h. Numerals next to the coloured symbols indicate temperature levels.
Fig. 1 in Halocarbon emissions by selected tropical seaweeds exposed to different temperatures
Fig. 1. Total emission rates for halocarbons (pmol gFW 1 h 1; n = 60) for the four seaweeds, G. manilaensis (GM), U. reticulata (UR), K. alvarezii (KA) and T. conoides (TC) for all experimental temperatures and treatment durations. In this, the horizontal bar represents the median value, the box gives the upper and lower quartile range and the error bar shows the spread of the data. The circles denote excluded outlier data (+ between 1.5 and 3 box lengths from the box edges) and extreme cases (⁄> 3 box lengths from the box edges).
Fig. 5. Chl-a in Halocarbon emissions by selected tropical seaweeds exposed to different temperatures
Fig. 5. Chl-a (μg g 1), carotenoid (μg g 1) contents and the Chl-a: carotenoid ratios (average ± standard deviation; n = 12) of the four seaweeds, G. manilaensis (GM), U. reticulata (UR), K. alvarezii (KA) and T. conoides (TC), measured after a 28 h exposure to temperatures of 40, 35, 30, 25 and 20 ◦ C. Data were analysed using a oneway ANOVA. a,b,c, indicate homogeneous groups across temperature based on Tukey's post hoc test (p <0.05).
Fig. 4. Averaged F in Halocarbon emissions by selected tropical seaweeds exposed to different temperatures
Fig. 4. Averaged F/Fvalues (with standard deviation; n = 4) of seaweeds measured before (/B) and after (/A) incubation, under the ambient 25 ◦ C condition and v m the temperature treatments of 40, 35, 30 and 20 ◦ C, after 4 and 28 h exposure. a,b,c, indicate homogenous groups based on Tukey's post hoc test (p <0.05).
Fig. 6 in Halocarbon emissions by selected tropical seaweeds exposed to different temperatures
Fig. 6. Treatment of seaweeds at a particular temperature exposure.
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