Applications of quantum cascade lasers for sensitive trace gas measurements of CO, CH4, N2O and HCHO

Schiller, C. L.; Bozem, Heiko; Gurk, C.; Parchatka, Uwe; Königstedt, R.; Harris, G. W.; Lelieveld, Jos; Fischer, H.

doi:10.1007/s00340-008-3125-0

Cited by 67 publications

(66 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All in situ measurements used here are based on a data set with a 10 s time resolution, which is available from the HALO database (https://halo-db.pa.op.dlr.de). The corresponding measurement techniques are described in the accompanying paper and in more detail in publications about the individual instruments: CO (Hoor et al, 2004;Schiller et al, 2008;Müller et al, 2016), HCl Voigt et al, 2014), NO/NO y (Ziereis et al, 2000) and O 3 . Among those tracers, only HCl mixing ratios were at the instrument's detection limit during the considered flight .…”

Section: Datamentioning

confidence: 99%

Dynamics and composition of the Asian summer monsoon anticyclone

et al. 2018

View full text Add to dashboard Cite

Abstract. This study places HALO research aircraft observations in the upper-tropospheric Asian summer monsoon anticyclone (ASMA) into the context of regional, intra-annual variability by hindcasts with the ECHAM/MESSy Atmospheric Chemistry (EMAC) model. The observations were obtained during the Earth System Model Validation (ESMVal) campaign in September 2012. Observed and simulated tracer-tracer relations reflect photochemical O 3 production as well as in-mixing from the lower troposphere and the tropopause layer. The simulations demonstrate that tropospheric trace gas profiles in the monsoon season are distinct from those in the rest of the year, and the measurements reflect the main processes acting throughout the monsoon season. Net photochemical O 3 production is significantly enhanced in the ASMA, where uplifted precursors meet increased NO x , mainly produced by lightning. An analysis of multiple monsoon seasons in the simulation shows that stratospherically influenced tropopause layer air is regularly entrained at the eastern ASMA flank and then transported in the southern fringe around the interior region. Radial transport barriers of the circulation are effectively overcome by subseasonal dynamical instabilities of the anticyclone, which occur quite frequently and are of paramount importance for the trace gas composition of the ASMA. Both the isentropic entrainment of O 3 -rich air and the photochemical conversion of uplifted O 3 -poor air tend to increase O 3 in the ASMA outflow.

show abstract

Section: Datamentioning

confidence: 99%

Dynamics and composition of the Asian summer monsoon anticyclone

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The 1-sigma total uncertainty values were calculated to be 1.10 % for CO, 0.57 % for CH 4 and 8.56 % for HCHO. We refer to Schiller et al (2008) for more details on the different methods that were used to calculate the DL for TRISTAR and for an in depth description of the instrument and its performance during HOOVER.…”

Section: Measurements Of H 2 O 2 and Ch 3 Ooh *mentioning

confidence: 99%

Distribution of hydrogen peroxide and formaldehyde over Central Europe during the HOOVER project

et al. 2011

Self Cite

View full text Add to dashboard Cite

Abstract. In this study we report measurements of hydrogen peroxide (H 2 O 2 ), methyl hydroperoxide* (MHP* as a proxy of MHP based on an unspecific measurement of total organic peroxides) and formaldehyde (HCHO) from the HO x OVer EuRope (HOOVER) project (HO x = OH+HO 2 ). HOOVER included two airborne field campaigns, in October 2006 and July 2007. Measurement flights were conducted from the base of operation Hohn (Germany, 54 • N, 9 • E) towards the Mediterranean and to the subpolar regions over Norway. We find negative concentration gradients with increasing latitude throughout the troposphere for H 2 O 2 and CH 3 OOH * . In contrast, observed HCHO is almost homogeneously distributed over central and northern Europe and is elevated over the Mediterranean. In general, the measured gradients tend to be steepest entering the Mediterranean region, where we also find the highest abundances of the 3 species. Mixing ratios of these tracers generally decrease with altitude. H 2 O 2 and CH 3 OOH * show maxima above the boundary layer at 2-5 km, being more distinct over southern than over northern Europe.We also present a comparison of our data with simulations by two global 3-D-models, MATCH-MPIC and EMAC, and with the box model CAABA. The models realistically represent altitude and latitude gradients for both HCHO and hydroperoxides (ROOH). In contrast, the models have problems reproducing the absolute mixing ratios, in particular of H 2 O 2 . Large uncertainties about retention coefficients and Correspondence to: H. Fischer (horst.fischer@mpic.de) cloud microphysical parameters suggest that cloud scavenging might be a large source of error for the simulation of H 2 O 2 . A sensitivity study with EMAC shows a strong influence of cloud and precipitation scavenging on the budget of H 2 O 2 as simulations improve significantly with this effect switched off.

show abstract

“…The TRIHOP instrument is a three-channel Quantum Cascade Laser Infrared Absorption spectrometer (QCLAS) capable of the subsequent measurement of CO, CO 2 , CH 4 , and N 2 O (Schiller et al, 2008;Müller et al, 2016). The instrument applies QCLAS in the mid-infrared with a multipass absorption cell (type White), which is kept at a constant pressure of p = 30 hPa and has a path length of 64 m and a volume of 2.7 L. During TACTS/ESMVal the instrument is in situ calibrated approx.…”

Section: Trihopmentioning

confidence: 99%

The novel HALO mini-DOAS instrument: inferring trace gas concentrations from airborne UV/visible limb spectroscopy under all skies using the scaling method

et al. 2017

View full text Add to dashboard Cite

Abstract. We report on a novel six-channel optical spectrometer (further on called mini-DOAS instrument) for airborne nadir and limb measurements of atmospheric trace gases, liquid and solid water, and spectral radiances in the UV/vis and NIR spectral ranges. The spectrometer was developed for measurements from aboard the German High-Altitude and Long-Range (HALO) research aircraft during dedicated research missions. Here we report on the relevant instrumental details and the novel scaling method used to infer the mixing ratios of UV/vis absorbing trace gases from their absorption measured in limb geometry. The uncertainties of the scaling method are assessed in more detail than before for sample measurements of NO 2 and BrO. Some first results are reported along with complementary measurements and comparisons with model predictions for a selected HALO research flight from Cape Town to Antarctica, which was performed during the research mission ESMVal on 13 September 2012.

show abstract

Applications of quantum cascade lasers for sensitive trace gas measurements of CO, CH4, N2O and HCHO

Cited by 67 publications

References 26 publications

Dynamics and composition of the Asian summer monsoon anticyclone

Dynamics and composition of the Asian summer monsoon anticyclone

Distribution of hydrogen peroxide and formaldehyde over Central Europe during the HOOVER project

The novel HALO mini-DOAS instrument: inferring trace gas concentrations from airborne UV/visible limb spectroscopy under all skies using the scaling method

Contact Info

Product

Resources

About