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Gorodetskaya I V, Van Lipzig N P M, Van den Broeke M R, Mangold A, Boot W, Reijmer C H, |
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Title |
Meteorological regimes and accumulation patterns at Utsteinen, Dronning Maud Land, East Antarctica: Analysis of two contrasting years
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Type |
Journal Article |
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Year |
2013 |
Publication |
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
118 |
Issue |
4 |
Pages |
1700-1715 |
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Keywords |
3270 Time series analysis, 3307 Boundary layer processes, 3349 Polar meteorology, 3354 Precipitation, 3359 Radiative processes, Antarctica, AWS, katabatic, meteorological regimes, snow accumulation, synoptic, |
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Abstract |
Since February 2009, an automatic weather station (AWS) has been operating near Utsteinen Nunatak, north of the Sør Rondane Mountains, in Dronning Maud Land at the ascent to the East Antarctic Plateau. This paper gives an assessment of the meteorological conditions, radiative fluxes, and snow accumulation for the ï¬rst 2 years of operation, 2009 to 2010, analyzed in terms of meteorological regimes. Three major meteorological regimes—cold katabatic, warm synoptic, and transitional synoptic—are identiï¬ed using cluster analysis based on ï¬ve parameters derived from the AWS measurements (wind speed, speciï¬c humidity, near-surface temperature inversion, surface pressure, and incoming longwave flux indicative of cloud forcing). For its location, the relatively mild climate at Utsteinen can be explained by the high frequency of synoptic events (observed 41%–48% of the time), and a lack of drainage of cold air from the plateau due to mountain sheltering. During the cold
katabatic regime, a strong surface cooling leads to a strong near-surface temperature inversion
buildup. A large difference in accumulation is recorded by the AWS for the ï¬rst 2 years: 235 mm water equivalent in 2009 and 27 mm water equivalent in 2010. Several large accumulation events during the warm synoptic regime occurring mainly in winter were responsible for the majority of the accumulation in 2009. Mostly, small accumulation events occurred during 2010, frequently followed by snow removal. This interannual variability in snow accumulation at the site is related to the intensity of the local synoptic events as recorded by meteorological regime characteristics. |
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2169-8996 |
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4505 |
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Author |
Preunkert Susanne, Legrand Michel, Pépy Guillaume, Gallée Hubert, Jones Anna, Jourdain Bruno, |
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Title |
The atmospheric HCHO budget at Dumont d'Urville (East Antarctica): Contribution of photochemical gas-phase production versus snow emissions
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Type |
Journal Article |
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Year |
2013 |
Publication |
Journal of Geophysical Research: Atmospheres |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
118 |
Issue |
23 |
Pages |
13,319-13,337 |
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Keywords |
atmospheric HCHO, coastal Antarctica, oxidative capacity, 0365 Troposphere: composition and chemistry, 0322 Constituent sources and sinks, |
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Abstract |
HCHO was monitored throughout the year 2009 at the coastal East Antarctic site of Dumont d'Urville (DDU) using Aerolaser AL-4021 analyzers. The accurate determination of less than 100 pptv required optimization of the analyzers, in particular, to minimize effects of changing ambient temperatures. The impact of station activities and of the presence of large penguin colonies at the site in summer was scrutinized. The obtained contamination-free record indicates monthly means close to 50 pptv from May to September and a maximum of 200 pptv in January. Zero-dimensional and 2-D calculations suggest that in summer, the largest HCHO source is the gas-phase photochemistry (80%) mainly driven by methane oxidation, which is considerably greater than from snow emissions (20%). The influence of light alkenes, dimethyl sulfide, and halogens remains weak. In winter, snow emissions represent the main HCHO source (70%). These findings are compared to previous studies conducted at the West Antarctic coast. It is shown that in summer the HCHO production from methane chemistry is 3 times more efficient at DDU than at the west coast due to more frequent arrival of oxidant-rich air masses from inland Antarctica. Halogen chemistry is found to represent a weak HCHO sink at both West and East Antarctica. Compared to DDU, the shallower atmospheric boundary layer and the less efficient gas-phase production at the west coast make the snow pack the dominant HCHO source (85%) compared to gas-phase photochemistry (15%) there in summer.
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414 |
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2169-8996 |
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yes |
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4802 |
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Pieterse G, Krol M C, Batenburg A M, M Brenninkmeijer C A, Popa M E, O'Doherty S, Grant A, Steele L P, Krummel P B, Langenfelds R L, Wang H J, Vermeulen A T, Schmidt M, Yver C, Jordan A, Engel A, Fisher R E, Lowry D, Nisbet E G, Reimann S, Vollmer M K, Steinbacher M, Hammer S, Forster G, Sturges W T, Röckmann T, |
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Title |
Reassessing the variability in atmospheric H2 using the two-way nested TM5 model
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Type |
Journal Article |
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Year |
2013 |
Publication |
Journal of Geophysical Research: Atmospheres |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
118 |
Issue |
9 |
Pages |
3764-3780 |
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Keywords |
Hydrogen isotopes, Molecular hydrogen, Chemical Transport Model, Tropospheric budget, Dry deposition, Sources and sinks, 0368 Troposphere: constituent transport and chemistry, 0365 Troposphere: composition and chemistry, 0322 Constituent sources and sinks, 0315 Biosphere/atmosphere interactions, 0317 Chemical kinetic and photochemical properties, |
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416 |
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2169-8996 |
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yes |
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Serial |
4839 |
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Author |
Koukouli M E, Lerot C, Granville J, Goutail F, Lambert J-C, Pommereau J-P, Balis D, Zyrichidou I, Van Roozendael M, Coldewey-Egbers M, Loyola D, Labow G, Frith S, Spurr R, Zehner C, |
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Title |
Evaluating a new homogeneous total ozone climate data record from GOME/ERS-2, SCIAMACHY/Envisat, and GOME-2/MetOp-A |
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Journal Article |
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Year |
2015 |
Publication |
Journal of Geophysical Research: Atmospheres |
Abbreviated Journal |
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Volume |
120 |
Issue |
23 |
Pages |
2015JD023699 |
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Keywords |
0340 Middle atmosphere: composition and chemistry, 0394 Instruments and techniques, 0480 Remote sensing, Brewer, Dobson, GOME-2, SCIAMACHY, total ozone, validation, |
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Abstract |
The European Space Agency's Ozone Climate Change Initiative (O3-CCI) project aims at producing and validating a number of high-quality ozone data products generated from different satellite sensors. For total ozone, the O3-CCI approach consists of minimizing sources of bias and systematic uncertainties by applying a common retrieval algorithm to all level 1 data sets, in order to enhance the consistency between the level 2 data sets from individual sensors. Here we present the evaluation of the total ozone products from the European sensors Global Ozone Monitoring Experiment (GOME)/ERS-2, SCIAMACHY/Envisat, and GOME-2/MetOp-A produced with the GOME-type Direct FITting (GODFIT) algorithm v3. Measurements from the three sensors span more than 16 years, from 1996 to 2012. In this work, we present the latest O3-CCI total ozone validation results using as reference ground-based measurements from Brewer and Dobson spectrophotometers archived at the World Ozone and UV Data Centre of the World Meteorological Organization as well as from UV-visible differential optical absorption spectroscopy (DOAS)/Système D′Analyse par Observations Zénithales (SAOZ) instruments from the Network for the Detection of Atmospheric Composition Change. In particular, we investigate possible dependencies in these new GODFIT v3 total ozone data sets with respect to latitude, season, solar zenith angle, and different cloud parameters, using the most adequate type of ground-based instrument. We show that these three O3-CCI total ozone data products behave very similarly and are less sensitive to instrumental degradation, mainly as a result of the new reflectance soft-calibration scheme. The mean bias to the ground-based observations is found to be within the 1 ± 1% level for all three sensors while the near-zero decadal stability of the total ozone columns (TOCs) provided by the three European instruments falls well within the 1–3% requirement of the European Space Agency's Ozone Climate Change Initiative project. |
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209 |
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2169-8996 |
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yes |
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6316 |
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Author |
Koukouli M E, Lerot C, Granville J, Goutail F, Lambert J-C, Pommereau J-P, Balis D, Zyrichidou I, Van Roozendael M, Coldewey-Egbers M, Loyola D, Labow G, Frith S, Spurr R, Zehner C, |
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Title |
Evaluating a new homogeneous total ozone climate data record from GOME/ERS-2, SCIAMACHY/Envisat, and GOME-2/MetOp-A |
Type |
Journal Article |
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Year |
2015 |
Publication |
Journal of Geophysical Research: Atmospheres |
Abbreviated Journal |
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Volume |
120 |
Issue |
23 |
Pages |
12,296-12,312 |
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Keywords |
total ozone, SCIAMACHY, Brewer, Dobson, GOME-2, validation, 0340 Middle atmosphere: composition and chemistry, 0394 Instruments and techniques, 0480 Remote sensing, |
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Abstract |
The European Space Agency's Ozone Climate Change Initiative (O3-CCI) project aims at producing and validating a number of high-quality ozone data products generated from different satellite sensors. For total ozone, the O3-CCI approach consists of minimizing sources of bias and systematic uncertainties by applying a common retrieval algorithm to all level 1 data sets, in order to enhance the consistency between the level 2 data sets from individual sensors. Here we present the evaluation of the total ozone products from the European sensors Global Ozone Monitoring Experiment (GOME)/ERS-2, SCIAMACHY/Envisat, and GOME-2/MetOp-A produced with the GOME-type Direct FITting (GODFIT) algorithm v3. Measurements from the three sensors span more than 16 years, from 1996 to 2012. In this work, we present the latest O3-CCI total ozone validation results using as reference ground-based measurements from Brewer and Dobson spectrophotometers archived at the World Ozone and UV Data Centre of the World Meteorological Organization as well as from UV-visible differential optical absorption spectroscopy (DOAS)/Système D′Analyse par Observations Zénithales (SAOZ) instruments from the Network for the Detection of Atmospheric Composition Change. In particular, we investigate possible dependencies in these new GODFIT v3 total ozone data sets with respect to latitude, season, solar zenith angle, and different cloud parameters, using the most adequate type of ground-based instrument. We show that these three O3-CCI total ozone data products behave very similarly and are less sensitive to instrumental degradation, mainly as a result of the new reflectance soft-calibration scheme. The mean bias to the ground-based observations is found to be within the 1 ± 1% level for all three sensors while the near-zero decadal stability of the total ozone columns (TOCs) provided by the three European instruments falls well within the 1–3% requirement of the European Space Agency's Ozone Climate Change Initiative project. |
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209 |
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2169-8996 |
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yes |
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6317 |
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Steen-Larsen, H.C., Risi, C., Masson-Delmotte, V., Werner, M., Yoshimura, K. |
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Title |
Evaluating the skills of isotope-enabled general circulation models against in situ atmospheric water vapor isotope observations |
Type |
Journal Article |
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Year |
2016 |
Publication |
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
Abbreviated Journal |
J. Geophys. Res. |
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Volume |
122 |
Issue |
1 |
Pages |
2016JD025443 |
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Abstract |
The skills of isotope-enabled general circulation models are evaluated against atmospheric water vapor isotopes. We have combined in situ observations of surface water vapor isotopes spanning multiple field seasons (2010, 2011, and 2012) from the top of the Greenland Ice Sheet (NEEM site: 77.45°N, 51.05°W, 2484 m above sea level) with observations from the marine boundary layer of the North Atlantic and Arctic Ocean (Bermuda Islands 32.26°N, 64.88°W, year: 2012; south coast of Iceland 63.83°N, 21.47°W, year: 2012; South Greenland 61.21°N, 47.17°W, year: 2012; Svalbard 78.92°N, 11.92°E, year: 2014). This allows us to benchmark the ability to simulate the daily water vapor isotope variations from five different simulations using isotope-enabled general circulation models. Our model-data comparison documents clear isotope biases both on top of the Greenland Ice Sheet (1–11‰ for δ18O and 4–19‰ for d-excess depending on model and season) and in the marine boundary layer (maximum differences for the following: Bermuda δ18O = ~1‰, d-excess = ~3‰; South coast of Iceland δ18O = ~2‰, d-excess = ~ 5‰; South Greenland δ18O = ~4‰, d-excess = ~7‰; Svalbard δ18O = ~2‰, d-excess = ~7‰). We find that the simulated isotope biases are not just explained by simulated biases in temperature and humidity. Instead, we argue that these isotope biases are related to a poor simulation of the spatial structure of the marine boundary layer water vapor isotopic composition. Furthermore, we specifically show that the marine boundary layer water vapor isotopes of the Baffin Bay region show strong influence on the water vapor isotopes at the NEEM deep ice core-drilling site in northwest Greenland. Our evaluation of the simulations using isotope-enabled general circulation models also documents wide intermodel spatial variability in the Arctic. This stresses the importance of a coordinated water vapor isotope-monitoring network in order to discriminate amongst these model behaviors. |
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1134 |
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2169-8996 |
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yes |
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6447 |
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Author |
Etienne Vignon, Frédéric Hourdin, Christophe Genthon, Hubert Gallée, Eric Bazile, Marie-Pierre Lefebvre, Jean-Baptiste Madeleine, Bas J. H. Van de Wiel |
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Title |
Antarctic boundary layer parametrization in a general circulation model: 1-D simulations facing summer observations at Dome C |
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Year |
2017 |
Publication |
Journal of Geophysical Research: Atmospheres |
Abbreviated Journal |
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Volume |
122 |
Issue |
13 |
Pages |
6818-6843 |
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Keywords |
Antarctic Plateau atmospheric boundary layer GABLS4 general circulation model physical parametrizations |
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Abstract |
The parametrization of the atmospheric boundary layer (ABL) is critical over the Antarctic Plateau for climate modelling since it affects the climatological temperature inversion and the negatively buoyant near-surface flow over the ice-sheet. This study challenges state-of-the-art parametrizations used in general circulation models to represent the clear-sky summertime diurnal cycle of the ABL at Dome C, Antarctic Plateau. The Laboratoire de Météorologie Dynamique-Zoom model is run in a 1-D configuration on the fourth Global Energy and Water Cycle Exchanges Project Atmospheric Boundary Layers Study case. Simulations are analyzed and compared to observations, giving insights into the sensitivity of one model that participates to the intercomparison exercise. Snow albedo and thermal inertia are calibrated leading to better surface temperatures. Using the so-called “thermal plume model” improves the momentum mixing in the diurnal ABL. In stable conditions, four turbulence schemes are tested. Best simulations are those in which the turbulence cuts off above 35 m in the middle of the night, highlighting the contribution of the longwave radiation in the ABL heat budget. However, the nocturnal surface layer is not stable enough to distinguish between surface fluxes computed with different stability functions. The absence of subsidence in the forcings and an underestimation of downward longwave radiation are identified to be likely responsible for a cold bias in the nocturnal ABL. Apart from model-specific improvements, the paper clarifies on which are the critical aspects to improve in general circulation models to correctly represent the summertime ABL over the Antarctic Plateau. |
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1013 |
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2169-8996 |
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2169-8996 |
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yes |
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7196 |
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Christophe Genthon, Richard Forbes, Etienne Vignon, Andrew Gettelman, Jean-Baptiste Madeleine |
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Title |
Comment on “Surface Air Relative Humidities Spuriously Exceeding 100% in CMIP5 Model Output and Their Impact on Future Projections” by K. Ruosteenoja et al. (2017) |
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Journal |
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Year |
2018 |
Publication |
Journal of Geophysical Research: Atmospheres |
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Volume |
123 |
Issue |
16 |
Pages |
8724-8727 |
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Abstract |
Key Points Ruosteenoja et al.'s () claim that supersaturation in the surface atmosphere is unrealistic and necessarily spurious and incorrect Supersaturations are a reality that an increasing number of atmospheric models can reproduce even in the surface atmosphere Modelers should not artificially cap relative humidity at 100% when feeding climate model archives |
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1013 |
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2169-8996 |
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2169-8996 |
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Serial |
7200 |
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F. Carbone, A. G. Bruno, A. Naccarato, F. De Simone, C. N. Gencarelli, F. Sprovieri, I. M. Hedgecock, M. S. Landis, H. Skov, K. A. Pfaffhuber, K. A. Read, L. Martin, H. Angot, A. Dommergue, O. Magand, N. Pirrone |
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Title |
The Superstatistical Nature and Interoccurrence Time of Atmospheric Mercury Concentration Fluctuations |
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Year |
2018 |
Publication |
Journal of Geophysical Research: Atmospheres |
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Volume |
123 |
Issue |
2 |
Pages |
764-774 |
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Keywords |
atmospheric turbulence interoccurrence times mercury superstatistics universal scaling |
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Abstract |
The probability density function (PDF) of the time intervals between subsequent extreme events in atmospheric Hg0 concentration data series from different latitudes has been investigated. The Hg0 dynamic possesses a long-term memory autocorrelation function. Above a fixed threshold Q in the data, the PDFs of the interoccurrence time of the Hg0 data are well described by a Tsallis q-exponential function. This PDF behavior has been explained in the framework of superstatistics, where the competition between multiple mesoscopic processes affects the macroscopic dynamics. An extensive parameter μ, encompassing all possible fluctuations related to mesoscopic phenomena, has been identified. It follows a χ2 distribution, indicative of the superstatistical nature of the overall process. Shuffling the data series destroys the long-term memory, the distributions become independent of Q, and the PDFs collapse on to the same exponential distribution. The possible central role of atmospheric turbulence on extreme events in the Hg0 data is highlighted. |
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1028 |
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2169-8996 |
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2169-8996 |
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yes |
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Serial |
7231 |
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Elsa Gautier, Joel Savarino, Joseph Erbland, James Farquhar |
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Title |
SO2 Oxidation Kinetics Leave a Consistent Isotopic Imprint on Volcanic Ice Core Sulfate |
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Journal |
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Year |
2018 |
Publication |
Journal of Geophysical Research: Atmospheres |
Abbreviated Journal |
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Volume |
123 |
Issue |
17 |
Pages |
9801-9812 |
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Keywords |
Antarctica ice core sulfur mass-independent isotope fractionation volcanic eruption |
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Abstract |
This work presents measurements of time-resolved mass-independently fractionated sulfate of volcanic origin from Antarctic ice core records that cover the last 2,600 years. These measurements are used to evaluate the time dependence of the deposited isotopic signal and to extract the isotopic characteristics of the reactions yielding sulfate from stratospheric volcanic eruptions in the modern atmosphere. Time evolution of the signal in snow (years) with respect to the fast SO2 oxidation in the stratosphere suggests that photochemically produced condensed phase is rapidly and continuously separated from the gas phase and preserved during transportation and deposition on the polar ice cap. On some eruptions, a nonzero isotopic mass balance highlights that a part of the signal can be lost during transport and/or deposition. The large number of volcanic events studied allows the Δ33S versus Δ36S and δ34S versus Δ33S slopes to be constrained at −1.56 (1σ = 0.25) and 0.09 (1σ = 0.02), respectively. The Δ33S versus Δ36S slope refines a prior determinations of Δ36S/Δ33S = −4 and overlaps the range observed for sulfur seen in early Earth samples (Archean). In recent volcanogenic sulfate, the Δ33S versus δ34S differs, however, from the Archean record. The similitude for Δ36S/Δ33S and the difference for Δ33S/δ34S suggest similar mass-independently fractionated sulfate processes to the Archean atmosphere. Using a simple model, we highlight that a combination of several mechanisms is needed to reproduce the observed isotopic trends and suggest a greater contribution from mass-dependent oxidation by OH in the modern atmosphere. |
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2169-8996 |
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2169-8996 |
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7420 |
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