Joint retrievals of cloud and drizzle in marine boundary layer clouds using ground-based radar, lidar and zenith radiances
Atmos. Meas. Tech., 8, 2663-2683, doi:10.5194/amt-8-2663-2015, 2015
GROMOS-C, a novel ground-based microwave radiometer for ozone measurement campaigns
Atmos. Meas. Tech., 8, 2649-2662, doi:10.5194/amt-8-2649-2015, 2015
Measurement of carbonaceous aerosol with different sampling configurations and frequencies
Summary: We measure carbonaceous aerosol in Beijing with different sampling configurations and frequencies. It is commonly believed that increasing sampling duration can reduce the influence of the positive sampling artifact and meanwhile does not affect the EC measurement. However, here we demonstrate that this is not necessarily the case. Particularly, we find that the negative sampling artifact of a bare quartz filter could be remarkably enhanced due to the uptake of water vapor by the filter medium.
Atmos. Meas. Tech., 8, 2639-2648, doi:10.5194/amt-8-2639-2015, 2015
Aerosol retrieval from multiangle, multispectral photopolarimetric measurements: importance of spectral range and angular resolution
Atmos. Meas. Tech., 8, 2625-2638, doi:10.5194/amt-8-2625-2015, 2015
High-resolution and Monte Carlo additions to the SASKTRAN radiative transfer model
Atmos. Meas. Tech., 8, 2609-2623, doi:10.5194/amt-8-2609-2015, 2015
A linear method for the retrieval of sun-induced chlorophyll fluorescence from GOME-2 and SCIAMACHY data
Summary: The paper presents recent developments for the retrieval of sun-induced fluorescence (SIF) from medium spectral resolution space-borne spectrometers such as the Global Ozone Monitoring Experiment (GOME-2) and the Scanning Imaging Absorption SpectroMeter for Atmospheric ChartographY (SCIAMACHY). Beside using simulated radiances to evaluate the retrieval performance, the method has also been used to estimate SIF at 740 nm using real spectra from GOME-2 and for the first time, from SCIAMACHY.
Atmos. Meas. Tech., 8, 2589-2608, doi:10.5194/amt-8-2589-2015, 2015
The charging of neutral dimethylamine and dimethylamine–sulfuric acid clusters using protonated acetone
Summary: Ionization reagents suitable for accurate measurements of the atmospheric gas-phase amine vapour concentrations are needed. Based on computational results, acetone is a viable option for use as an ionization reagent in CI-APi-TOF measurements on atmospheric dimethylamine. However, comparison between the computational and experimental results revealed notable discrepancies. Further study is still required before the acetone CI-APi-TOF can be considered a viable option in practice.
Atmos. Meas. Tech., 8, 2577-2588, doi:10.5194/amt-8-2577-2015, 2015
ACTRIS ACSM intercomparison – Part 2: Intercomparison of ME-2 organic source apportionment results from 15 individual, co-located aerosol mass spectrometers
Summary: Source apportionment (SA) of organic aerosol mass spectrometric data measured with the Aerodyne ACSM using PMF/ME2 is a frequently used technique in the AMS/ACSM community. ME2 uncertainties due to instrument-to-instrument variations are elucidated by performing SA on ambient data from 14 individual, co-located ACSMs, recorded during the first ACTRIS ACSM intercomparison study at SIRTA near Paris (France). The mean uncertainty was 17.2%. Recommendations for future studies using ME2 are provided.
Atmos. Meas. Tech., 8, 2555-2576, doi:10.5194/amt-8-2555-2015, 2015
In-flight control and communication architecture of the GLORIA imaging limb sounder on atmospheric research aircraft
Atmos. Meas. Tech., 8, 2543-2553, doi:10.5194/amt-8-2543-2015, 2015
Systematic evaluation of the impacts of GPSRO data on the prediction of typhoons over the northwestern Pacific in 2008–2010
Summary: We systematically evaluated the impact of GPSRO data on typhoon track prediction over the Northwestern Pacific during 2008 to 2010. Specifically, we perform data assimilation and forecast experiments using the TWRF system at 45km resolution on 11 typhoons, with or without the use of GPSRO refractivity. The results indicate that the assimilation of GPSRO reduces the 72-hour track forecast errors by ~12km (5 %). Although this is only a modest improvement, it is statistically significant.
Atmos. Meas. Tech., 8, 2531-2542, doi:10.5194/amt-8-2531-2015, 2015
A novel approach for absolute radar calibration: formulation and theoretical validation
Summary: The theory of an approach for absolute radar calibration with respect to reflectivity and without a previously calibrated reference device is laid out and validated. The method requires a network of two horizontally oriented radars operating within a frequency range strongly attenuated by liquid water and a radar allowing for drop size distribution measurements with height (e.g. micro rain radar). The analysis by means of synthetic data shows potential for future practical application.
Atmos. Meas. Tech., 8, 2521-2530, doi:10.5194/amt-8-2521-2015, 2015
Validation of first chemistry mode retrieval results from the new limb-imaging FTS GLORIA with correlative MIPAS-STR observations
Atmos. Meas. Tech., 8, 2509-2520, doi:10.5194/amt-8-2509-2015, 2015
Reconstruction of cloud geometry using a scanning cloud radar
Atmos. Meas. Tech., 8, 2491-2508, doi:10.5194/amt-8-2491-2015, 2015
Level 2 processing for the imaging Fourier transform spectrometer GLORIA: derivation and validation of temperature and trace gas volume mixing ratios from calibrated dynamics mode spectra
Summary: The GLORIA sounder is an airborne infrared limb-imager combining a two-dimensional infrared detector with a Fourier transform spectrometer. It was operated aboard the new German Gulfstream G550 research aircraft HALO during the TACTS and ESMVAL campaigns in summer 2012. This paper describes the retrieval of temperature, as well as H2O, HNO3, and O3 cross sections from GLORIA dynamics mode spectra. A high correlation is achieved between the remote sensing and the in situ trace gas measurements.
Atmos. Meas. Tech., 8, 2473-2489, doi:10.5194/amt-8-2473-2015, 2015
Validation of the poke-flow technique combined with simulations of fluid flow for determining viscosities in samples with small volumes and high viscosities
Atmos. Meas. Tech., 8, 2463-2472, doi:10.5194/amt-8-2463-2015, 2015
The micro-orifice uniform deposit impactor–droplet freezing technique (MOUDI-DFT) for measuring concentrations of ice nucleating particles as a function of size: improvements and initial validation
Atmos. Meas. Tech., 8, 2449-2462, doi:10.5194/amt-8-2449-2015, 2015
A technique for quantifying heterogeneous ice nucleation in microlitre supercooled water droplets
Atmos. Meas. Tech., 8, 2437-2447, doi:10.5194/amt-8-2437-2015, 2015
Tropospheric nitrogen dioxide column retrieval from ground-based zenith–sky DOAS observations
Summary: An algorithm is presented for retrieving tropospheric NO2 vertical column densities from ground-based zenith-sky (ZS) measurements of scattered sunlight. The different steps are fully characterized and recommendations are given for each of them. The retrieval algorithm is applied on a 2-month ZS data set acquired during the CINDI campaign and on a 2-year data set acquired at the OHP NDACC station. The error budget assessment indicates that the overall error on the column values is less than 28%.
Atmos. Meas. Tech., 8, 2417-2435, doi:10.5194/amt-8-2417-2015, 2015
Characterisation and optimisation of a sample preparation method for the detection and quantification of atmospherically relevant carbonyl compounds in aqueous medium
Summary: An optimised method for derivatisation of carbonyl compounds with o-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine (PFBHA) in aqueous samples is described. The comprehensive optimisation of the method leads to an improvement of the detection limit up to a factor of 10 highlighting the good sensitivity of the optimised method for atmospherically relevant carbonyl compounds. The optimised method was successfully applied to detect carbonyl compounds from the aqueous phase oxidation of 3-methylbutanone.
Atmos. Meas. Tech., 8, 2409-2416, doi:10.5194/amt-8-2409-2015, 2015
Electrodynamic balance measurements of thermodynamic, kinetic, and optical aerosol properties inaccessible to bulk methods
Summary: Atmospheric aerosol is often subject to supersaturated or supercooled conditions where bulk measurements are not possible. Here we demonstrate how measurements using single particle electrodynamic levitation combined with light scattering spectroscopy allow the retrieval of thermodynamic data, optical properties and water diffusivity of such metastable particles even when auxiliary bulk data are not available due to lack of sufficient amounts of sample.
Atmos. Meas. Tech., 8, 2397-2408, doi:10.5194/amt-8-2397-2015, 2015