Variability of trace gases at the high‐Alpine site Jungfraujoch caused by meteorological transport processes

Forrer, Jann; Rüttimann, Ralph; Schneiter, D.; Fischer, Andrea; Buchmann, B.; Höfer, Peter

doi:10.1029/1999jd901178

Cited by 92 publications

(91 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…14), significant in summer (−0.021 ± 0.017 ppb/a) and autumn (−0.033 ± 0.019 ppb/a). However, trends are largely due to the high mixing ratios of the first two years, 1995 and 1996, which might be potentially biased due to local construction activitites (Forrer et al, 2000). Thereafter, trends are much weaker and nonsignificant.…”

Section: Nitrogen Dioxidementioning

confidence: 99%

Ozone, carbon monoxide and nitrogen oxides time series at four alpine GAW mountain stations in central Europe

et al. 2010

View full text Add to dashboard Cite

Abstract. Long-term, ground based in-situ observations of ozone (O 3 ) and its precursor gases nitrogen dioxide (NO 2 ) and carbon monoxide (CO) from the four sites Hohenpeissenberg and Zugspitze (D), Sonnblick (A) and Jungfraujoch (CH) are presented for the period 1995-2007. These Central European alpine mountain observatories cover an altitude range of roughly 1000 to 3500 m. Comparable analytical methods and common quality assurance (QA) procedures are used at all sites. For O 3 and CO, calibration is linked to primary calibrations (O 3 ) or CO standards provided by the Central Calibration Laboratory (CCL) at NOAA/ESRL. All stations have been audited by the World Calibration Centre (WCC) for CO and O 3 (WCC-Empa; CH). Data from long-term measurements of NO 2 and CO are only available from Hohenpeissenberg and Jungfraujoch. Both sites show slightly decreasing mixing ratios of the primarily emitted NO 2 and the partly anthropogenically emitted CO between 1995 and 2007. The findings are generally consistent with shorter observation periods at Zugspitze and Sonnblick and thus are considered to represent regional changes in Central European atmospheric composition at this altitude range. Over the same period, 1995-2007, the O 3 mixing ratios have slightly increased at three of the four sites independent of wind sector. Trends are often more pronounced in winter and less in summer; highest declines of NO 2 and CO are observed in winter and the lowest in summer, whereas the strongest O 3 increase was detected in winter and lowest or even decline in summer, respectively. Weekly cycles demonstrate anthropogenic impact at all elevations with enhanced NO 2 on working days compared to weekends. Enhanced O 3 Correspondence to: S. Gilge (stefan.gilge@dwd.de) values on working days indicating photochemical production from anthropogenic precursors are only observed in summer, whereas in all other seasons anti-correlation with NO 2 was found due to reduced O 3 values on working days. Trends are discussed with respect to anthropogenic impacts and vertical mixing. The observed trends for NO 2 at the alpine mountain sites are less pronounced than trends estimated based on emission inventories.

show abstract

Section: Nitrogen Dioxidementioning

confidence: 99%

Ozone, carbon monoxide and nitrogen oxides time series at four alpine GAW mountain stations in central Europe

et al. 2010

View full text Add to dashboard Cite

show abstract

“…There are several methods to perform this filtering. One is to analyze and take into account various meteorological parameters (Forrer et al, 2000;Zellweger et al, 2003). Other methods use the determination of air mass origin Statistical methods do not require auxiliary data, but exist in several forms and shapes.…”

Section: Selection Of Data Representative Of Free Troposphere Airmentioning

confidence: 99%

1997–2007 CO trend at the high Alpine site Jungfraujoch: a comparison between NDIR surface in situ and FTIR remote sensing observations

Dils

Cui²,

Henne

et al. 2011

Atmos. Chem. Phys.

View full text Add to dashboard Cite

Abstract. Within the atmospheric research community, there is a strong interest in integrated datasets, combining data from several instrumentations. This integration is complicated by the different characteristics of the datasets, inherent to the measurement techniques. Here we have compared two carbon monoxide time series (1997 till 2007) acquired at the high-Alpine research station Jungfraujoch (3580 m above sea level), with two well-established measurement techniques, namely in situ surface concentration measurements using Non-Dispersive Infrared Absorption technology (NDIR), and ground-based remote sensing measurements using solar absorption Fourier Transform Infrared spectrometry (FTIR). The profile information available in the FTIR signal allowed us to extract an independent layer with a top height of 7.18 km above sea level, appropriate for comparison with our in situ measurements. We show that, even if both techniques are able to measure free troposphere CO concentrations, the datasets exhibit marked differences in their overall trends (−3.21 ± 0.03 ppb year −1 for NDIR vs.−0.8 ± 0.4 ppb year −1 for FTIR). Removing measurements that are polluted by uprising boundary layer air has a strong impact on the NDIR trend (now −2.62 ± 0.03 ppb year −1 ), but its difference with FTIR remains significant. Using the LAGRANTO trajectory model, we show that both measurement techniques are influenced by different source regions and therefore are likely subject to exhibit significant differences in their overall trend behaviour. However the observation that the NDIR-FTIR trend difference is as significant before as after 2001 is at odds with available emission databases which claim a significant Asian CO increase after 2001 only.

show abstract

“…Surface emissions can reach Jungfraujoch via several processes (Forrer et al, 2000). The most relevant ones (Zellweger et al, 2003) are as follows.…”

Section: Introductionmentioning

confidence: 99%

“…Anabatic winds cause tracer measurements near mountain peaks to exhibit a diurnal cycle that is approximately sinusoidal in shape (Forrer et al, 2000;Whiteman, 2000). Unlike measurements in the boundary layer over flat terrain, which are typically characterised by peak values around dawn, the maximum occurs in the late afternoon as a result of boundary-layer air being brought to the mountain peak by anabatic winds.…”

Section: Introductionmentioning

confidence: 99%

Surface-to-mountaintop transport characterised by radon observations at the Jungfraujoch

et al. 2014

View full text Add to dashboard Cite

Abstract. Atmospheric composition measurements at Jungfraujoch are affected intermittently by boundary-layer air which is brought to the station by processes including thermally driven (anabatic) mountain winds. Using observations of radon-222, and a new objective analysis method, we quantify the land-surface influence at Jungfraujoch hour by hour and detect the presence of anabatic winds on a daily basis. During 2010-2011, anabatic winds occurred on 40 % of days, but only from April to September. Anabatic wind days were associated with warmer air temperatures over a large fraction of Europe and with a shift in air-mass properties, even when comparing days with a similar mean radon concentration. Excluding days with anabatic winds, however, did not lead to a better definition of the unperturbed aerosol background than a definition based on radon alone. This implies that a radon threshold reliably excludes local influences from both anabatic and non-anabatic vertical-transport processes.

show abstract

Variability of trace gases at the high‐Alpine site Jungfraujoch caused by meteorological transport processes

Cited by 92 publications

References 16 publications

Ozone, carbon monoxide and nitrogen oxides time series at four alpine GAW mountain stations in central Europe

Ozone, carbon monoxide and nitrogen oxides time series at four alpine GAW mountain stations in central Europe

1997–2007 CO trend at the high Alpine site Jungfraujoch: a comparison between NDIR surface in situ and FTIR remote sensing observations

Surface-to-mountaintop transport characterised by radon observations at the Jungfraujoch

Contact Info

Product

Resources

About