Atmospheric Measurement Techniques
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Development of an automated high-temperature valveless injection system for online gas chromatographyAbstract. A reliable method of sample introduction is presented for online gas chromatography with a special application to in situ field portable atmospheric sampling instruments. A traditional multi-port valve is replaced with a valveless sample introduction interface that offers the advantage of long-term reliability and stable sample transfer efficiency. An engineering design model is ... ...
Atmospheric Measurement Techniques - Tập 7 Số 12 - Trang 4431-4444
A technique for rapid source apportionment applied to ambient organic aerosol measurements from a thermal desorption aerosol gas chromatograph (TAG)Abstract. We present a rapid method for apportioning the sources of atmospheric organic aerosol composition measured by gas chromatography–mass spectrometry methods. Here, we specifically apply this new analysis method to data acquired on a thermal desorption aerosol gas chromatograph (TAG) system. Gas chromatograms are divided by retention time into evenly spaced bins, within which the ma... ...
Atmospheric Measurement Techniques - Tập 9 Số 11 - Trang 5637-5653
A versatile and reproducible automatic injection system for liquid standard introduction: application to in-situ calibrationAbstract. The quantitation of trace organic compounds in ambient organic aerosol is difficult due to the chemical complexity of these mixtures, but is needed to provide insight into their sources and formation processes. Compound-level characterization of organic aerosols is typically performed through sample collection followed by gas or liquid chromatography. With these methods, introduc... ...
Atmospheric Measurement Techniques - Tập 4 Số 9 - Trang 1937-1942
Aerodynamic gradient measurements of the NH<sub>3</sub>-HNO<sub>3</sub>-NH<sub>4</sub>NO<sub>3</sub> triad using a wet chemical instrument: an analysis of precision requirements and flux errorsAbstract. The aerodynamic gradient method is widely used for flux measurements of ammonia, nitric acid, particulate ammonium nitrate (the NH3-HNO3-NH4NO3 triad) and other water-soluble reactive trace compounds. The surface exchange flux is derived from a measured concentration difference and micrometeorological quantities (turbulent exchange coefficient). The significance of the measured c... ...
Atmospheric Measurement Techniques - Tập 3 Số 1 - Trang 187-208
Modeled source apportionment of black carbon particles coated with a light-scattering shellAbstract. The Aethalometer model has been used widely for estimating the contributions
of fossil fuel emissions and biomass burning to equivalent black carbon
(eBC). The calculation is based on measured absorption Ångström
exponents (αabs). The interpretation of αabs is
ambiguous since it is well known that it not only depends on the dominant absorber but also on the size and internal stru... ...
Atmospheric Measurement Techniques - Tập 14 Số 5 - Trang 3707-3719
Linear estimation of particle bulk parameters from multi-wavelength lidar measurementsAbstract. An algorithm for linear estimation of aerosol bulk properties such as particle volume, effective radius and complex refractive index from multiwavelength lidar measurements is presented. The approach uses the fact that the total aerosol concentration can well be approximated as a linear combination of aerosol characteristics measured by multi-wavelength lidar. Therefore, the aero... ...
Atmospheric Measurement Techniques - Tập 5 Số 5 - Trang 1135-1145
Effects of systematic and random errors on the retrieval of particle microphysical properties from multiwavelength lidar measurements using inversion with regularizationAbstract. In this work we study the effects of systematic and random errors on the inversion of multiwavelength (MW) lidar data using the well-known regularization technique to obtain vertically resolved aerosol microphysical properties. The software implementation used here was developed at the Physics Instrumentation Center (PIC) in Troitsk (Russia) in conjunction with the NASA/Goddard S... ...
Atmospheric Measurement Techniques - Tập 6 Số 11 - Trang 3039-3054
Information content and sensitivity of the 3<i>β</i> + 2<i>α</i> lidar measurement system for aerosol microphysical retrievalsAbstract. There is considerable interest in retrieving profiles of aerosol effective radius, total number concentration, and complex refractive index from lidar measurements of extinction and backscatter at several wavelengths. The combination of three backscatter channels plus two extinction channels (3β + 2α) is particularly important since it is believed to be the minimum configuration ... ...
Atmospheric Measurement Techniques - Tập 9 Số 11 - Trang 5555-5574
Retrieval of spatio-temporal distributions of particle parameters from multiwavelength lidar measurements using the linear estimation technique and comparison with AERONETAbstract. The results of the application of the linear estimation technique to multiwavelength Raman lidar measurements performed during the summer of 2011 in Greenbelt, MD, USA, are presented. We demonstrate that multiwavelength lidars are capable not only of providing vertical profiles of particle properties but also of revealing the spatio-temporal evolution of aerosol features. The nig... ...
Atmospheric Measurement Techniques - Tập 6 Số 10 - Trang 2671-2682
Aerosol classification using airborne High Spectral Resolution Lidar measurements – methodology and examplesAbstract. The NASA Langley Research Center (LaRC) airborne High Spectral Resolution Lidar (HSRL) on the NASA B200 aircraft has acquired extensive datasets of aerosol extinction (532 nm), aerosol optical depth (AOD) (532 nm), backscatter (532 and 1064 nm), and depolarization (532 and 1064 nm) profiles during 18 field missions that have been conducted over North America since 2006. The lidar... ...
Atmospheric Measurement Techniques - Tập 5 Số 1 - Trang 73-98
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