Monitoring of the integrated column of hydrogen fluoride above the Jungfraujoch Station since 1977 ? the HF/HCl column ratio

Zander, Rodolphe; Roland, G.; Delbouille, L.; Sauval, A. J.; Farmer, C. B.; Norton, R. H.

doi:10.1007/bf00113901

Cited by 36 publications

(14 citation statements)

References 13 publications

(15 reference statements)

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“…No instrumental changes occurred along the series of observations upon which the present analysis is based (both solar lines and temperature insensitive transitions of telluric gases with known concentrations, e.g., N2 and CO2, are recorded regularly to establish the instrumental stability and verify analytical performances). In that context, it should further be noticed that our HF trend evaluation over the same timespan, and derived from observations with the same instrumentation, are in excellent agreement with other results and with model predictions (Zander et al, 1987b).…”

Section: Discussionsupporting

confidence: 88%

Column abundance and the long-term trend of hydrogen chloride (HCl) above the Jungfraujoch Station

et al. 1987

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The integrated column amount of hydrogen chloride has been monitored above the International Scientific Station of the Jungfraujoch (Switzerland) during the last 8 years. The results deduced from solar absorption measurements near 3.42 gm indicate a secular trend equivalent to (0.75 + 0.2) % increase per year since 1978, superimposed on a significant short-term variability which can be partly attributed to the tropospheric component of the total HCI burden. Based on an intensified set of measurements carried out over the last three years, a seasonal component in the total content of HCI has been established for the first time, showing a minimum occuring in early winter and a maximum during the spring.

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Section: Discussionsupporting

confidence: 88%

Column abundance and the long-term trend of hydrogen chloride (HCl) above the Jungfraujoch Station

et al. 1987

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“…20 (1990b). With regard to the individual profiles for April-May 1985 and the 25-35" N latitude zone, assuming unity quantum yield for photodissociation in the photolysis of COF,, the model simulates very well the HF profile of Table II above 35 km altitude, but underestimates significantly the HF VMRs below that altitude, up to a factor 3 in the 20-25 km layer; this is the main reason for the model calculated HF vertical columns to be systematically lower than those observed by airplane, i.e., by Mankin and Coffey (1983), and from the ground, i.e., by Zander et al (1987b), Wallace andLivingston (1991), Rinsland et al, (1991). The calculated COFz VMRs are also in reasonable agreement between 25 and 45 km with the observed values given in Table II, being lower below and higher above that altitude range.…”

Section: Comparison Of the CL And F Columns Inmentioning

confidence: 70%

The 1985 chlorine and fluorine inventories in the stratosphere based on ATMOS observations at 30� north latitude

et al. 1992

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“…In this section trends in ACE-FTS, HALOE, GOZCARDS, and SLIMCAT time series are quantified as a function of altitude and latitude. A number of previous studies have quantified trends; for example, a linear trend of 8.5 ± 1.0 % year −1 (1977 to 1986) (Zander et al, 1987) (Brown et al, 2011).…”

Section: Trendsmentioning

confidence: 99%

Satellite observations of stratospheric hydrogen fluoride and comparisons with SLIMCAT calculations

et al. 2016

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Abstract. The vast majority of emissions of fluorinecontaining molecules are anthropogenic in nature, e.g. chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and hydrofluorocarbons (HFCs). Many of these fluorine-containing species deplete stratospheric ozone and are regulated by the Montreal Protocol. Once in the atmosphere they slowly degrade, ultimately leading to the formation of hydrogen fluoride (HF), the dominant reservoir of stratospheric fluorine due to its extreme stability. Monitoring the growth of stratospheric HF is therefore an important marker for the success of the Montreal Protocol.We report the comparison of global distributions and trends of HF measured in the Earth's atmosphere by the satellite remote-sensing instruments ACE-FTS (Atmospheric Chemistry Experiment Fourier transform spectrometer), which has been recording atmospheric spectra since 2004, and HALOE (HALogen Occultation Experiment), which recorded atmospheric spectra between 1991 and 2005, with the output of SLIMCAT, a state-of-the-art threedimensional chemical transport model. In general the agreement between observation and model is good, although the ACE-FTS measurements are biased high by ∼ 10 % relative to HALOE. The observed global HF trends reveal a substantial slowing down in the rate of increase of HF since the 1990s: 4.97 ± 0.12 % year −1 (1991-1997; HALOE), 1.12 ± 0.08 % year −1 (1998 HALOE), and 0.52 ± 0.03 % year −1 (2004-2012 ACE-FTS). In comparison, SLIMCAT calculates trends of 4.01, 1.10, and 0.48 % year −1 , respectively, for the same periods; the agreement is very good for all but the earlier of the two HALOE periods. Furthermore, the observations reveal variations in the HF trends with latitude and altitude; for example, between 2004 and 2012 HF actually decreased in the Southern Hemisphere below ∼ 35 km. An additional SLIMCAT simulation with repeating meteorology for the year 2000 produces much cleaner trends in HF with minimal variations with latitude and altitude. Therefore, the variations with latitude and altitude in the observed HF trends are due to variability in stratospheric dynamics on the timescale of a few years. Overall, the agreement between observation and model points towards the ongoing success of the Montreal Protocol and the usefulness of HF as a metric for stratospheric fluorine.

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Monitoring of the integrated column of hydrogen fluoride above the Jungfraujoch Station since 1977 ? the HF/HCl column ratio

Cited by 36 publications

References 13 publications

Column abundance and the long-term trend of hydrogen chloride (HCl) above the Jungfraujoch Station

Column abundance and the long-term trend of hydrogen chloride (HCl) above the Jungfraujoch Station

The 1985 chlorine and fluorine inventories in the stratosphere based on ATMOS observations at 30� north latitude

Satellite observations of stratospheric hydrogen fluoride and comparisons with SLIMCAT calculations

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