Definitive Measurement of Semivolatile PAHs with a Diffusion Separator: Design and Investigation of Sampling Artifacts in Filter-Adsorbent Samplers

2020 ◽  
pp. 369-392
Author(s):  
Barbara J. Turpin ◽  
Shi-Ping Liu ◽  
Peter H. McMurry ◽  
Steven J. Eisenreich
Keyword(s):  
Sampling Artifacts

scholarly journals Sampling Artifacts from Conductive Silicone Tubing

2009 ◽  
Vol 43 (9) ◽  
pp. 855-865 ◽  
Author(s):  
Michael T. Timko ◽  
Zhenhong Yu ◽  
Jesse Kroll ◽  
John T. Jayne ◽  
Douglas R. Worsnop ◽  
...  
Keyword(s):  
Silicone Tubing ◽  
Sampling Artifacts

scholarly journals Impact of satellite viewing swath width on global and regional aerosol optical thickness statistics and trends

2013 ◽  
Vol 6 (6) ◽  
pp. 10117-10163 ◽  
Author(s):  
P. R. Colarco ◽  
R. A. Kahn ◽  
L. A. Remer ◽  
R. C. Levy
Keyword(s):  
Optical Thickness ◽  
Statistical Significance ◽  
Sampling Strategy ◽  
Aerosol Optical Thickness ◽  
Mean Values ◽  
Sampling Artifacts ◽  
Aerosol Loading ◽  
Decadal Scale ◽  
Along Track ◽  
The Impact

Abstract. We use the Moderate Resolution Imaging Spectroradiometer (MODIS) satellite aerosol optical thickness (AOT) product to assess the impact of reduced swath width on global and regional AOT statistics and trends. Ten different sampling strategies are employed, in which the full MODIS dataset is sub-sampled with various narrow-swath (~400–800 km) and curtain-like (~10 km) along-track configurations. Although view-angle artifacts in the MODIS AOT retrieval confound direct comparisons between averages derived from different sub-samples, careful analysis shows that with many portions of the Earth essentially unobserved, the AOT statistics of these sub-samples exhibit significant regional and seasonal biases. These AOT spatial sampling artifacts comprise up to 60% of the full-swath AOT value under moderate aerosol loading, and can be as large as 0.1 in some regions under high aerosol loading. Compared to full-swath observations, narrower swaths exhibit a reduced ability to detect AOT trends with statistical significance, and for curtain-like sampling we do not find any statistically significant decadal-scale trends at all. An across-track sampling strategy obviates the MODIS view angle artifact, and its mean AOT converges to the full-swath mean values for sufficiently coarse spatial and temporal aggregation. Nevertheless, across-track sampling has significant seasonal-regional sampling artifacts, leading to biases comparable to the curtain-like along-track sampling, lacks sufficient coverage to assign statistical significance to aerosol trends, and is not achievable with an actual narrow-swath or curtain-like instrument. These results suggest that future aerosol satellite missions having significantly less than full-swath viewing are unlikely to sample the true AOT distribution well enough to determine decadal-scale trends or to obtain the statistics needed to reduce uncertainty in aerosol direct forcing of climate.

Sampling Artifacts in Quantitative Schlieren

2019 ◽  
Author(s):  
Todd A. Hay ◽  
John Valdez ◽  
Charles E. Tinney ◽  
Mark Hamilton ◽  
Christophe Schram
Keyword(s):  
Sampling Artifacts

scholarly journals Reducing sampling artifacts in active air sampling methodology for remote monitoring and atmospheric fate assessment of cyclic volatile methylsiloxanes

Chemosphere ◽  
2020 ◽  
Vol 255 ◽  
pp. 126967
Author(s):  
Nicholas A. Warner ◽  
Vladimir Nikiforov ◽  
Ingjerd S. Krogseth ◽  
Stine M. Bjørneby ◽  
Amelie Kierkegaard ◽  
...  
Keyword(s):  
Remote Monitoring ◽  
Air Sampling ◽  
Sampling Methodology ◽  
Sampling Artifacts ◽  
Atmospheric Fate

Positive sampling artifacts of organic carbon fractions for fine particles and nanoparticles in a tunnel environment

2012 ◽  
Vol 54 ◽  
pp. 225-230 ◽  
Author(s):  
Chong-Shu Zhu ◽  
Chuen-Jinn Tsai ◽  
Sheng-Chieh Chen ◽  
Jun-Ji Cao ◽  
Gwo-Dong Roam
Keyword(s):  
Organic Carbon ◽  
Fine Particles ◽  
Carbon Fractions ◽  
Sampling Artifacts ◽  
Organic Carbon Fractions

scholarly journals An improved inlet for precisely measuring the atmospheric Ar/N<sub>2</sub> ratio

2006 ◽  
Vol 6 (5) ◽  
pp. 1181-1184 ◽  
Author(s):  
T. W. Blaine ◽  
R. F. Keeling ◽  
W. J. Paplawsky
Keyword(s):  
Heat Exchange ◽  
Diurnal Cycle ◽  
Thermal Fractionation ◽  
Sampling Artifacts ◽  
Fractionation Effect

Abstract. The atmospheric Ar/N2 ratio is expected to be useful as a tracer of air-sea heat exchange, but this application has been hindered in part due to sampling artifacts. Here we show that the variability in δ(Ar/N2) due to thermal fractionation at the inlet can be on the order of 40-80 per meg, and we introduce the use of an aspirated solar shield that successfully minimizes such fractionation. The data collected using this new inlet have a mean diurnal cycle of 1.0 per meg or less, suggesting that any residual thermal fractionation effect is reduced to this level.

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