scholarly journals Analysis of non-methane hydrocarbons in air samples collected aboard the CARIBIC passenger aircraft

2009 ◽  
Vol 2 (5) ◽  
pp. 2377-2401 ◽  
Author(s):  
A. K. Baker ◽  
F. Slemr ◽  
C. A. M. Brenninkmeijer
Keyword(s):  
Monitoring Program ◽  
Atmospheric Measurements ◽  
Air Samples ◽  
Upper Troposphere ◽  
Mixing Ratios ◽  
Civil Aircraft ◽  
Long Term Monitoring ◽  
Passenger Aircraft ◽  
Term Monitoring

Abstract. The CARIBIC project (Civil Aircraft for the Regular Investigation of the atmosphere Based on an Instrument Container) is a long-term monitoring program making regular atmospheric measurements from an instrument container installed monthly aboard a passenger aircraft. Typical cruising altitudes of the aircraft allow for the study of the free troposphere and the extra-tropical upper troposphere as well as the lowermost stratosphere. CARIBIC measurements include a number of real time analyses as well as the collection of aerosol and whole air samples. These whole air samples are analyzed post-flight for a suite of trace gases, which includes non-methane hydrocarbons (NMHC). The NMHC measurement system and its analytical performance are described here. Precision was found to vary slightly by compound, and is less than 2% for the C2–C6 alkanes and ethyne, and between 1 and 6% for C7–C8 alkanes and aromatic compounds. Preliminary results from participation in a Global Atmospheric Watch (WMO) VOC audit indicate accuracies within the precision of the system. Limits of detection are 1 pptv for most compounds, and up to 3 pptv for some aromatics. These are sufficiently low to measure mixing ratios typically observed in the upper troposphere and lowermost stratosphere for the longer-lived NMHC, however, in air samples from these regions many of the compounds with shorter lifetimes (<5 d) were frequently below the detection limit. Observed NMHC concentrations span many orders of magnitude, dependent on atmospheric region and air mass history, with concentrations typically decreasing with shorter chemical lifetimes.

scholarly journals Analysis of non-methane hydrocarbons in air samples collected aboard the CARIBIC passenger aircraft

2010 ◽  
Vol 3 (1) ◽  
pp. 311-321 ◽  
Author(s):  
A. K. Baker ◽  
F. Slemr ◽  
C. A. M. Brenninkmeijer
Keyword(s):  
Monitoring Program ◽  
Atmospheric Measurements ◽  
Air Samples ◽  
Upper Troposphere ◽  
Mixing Ratios ◽  
Civil Aircraft ◽  
Long Term Monitoring ◽  
Passenger Aircraft ◽  
Term Monitoring

Abstract. The CARIBIC project (Civil Aircraft for the Regular Investigation of the atmosphere Based on an Instrument Container) is a long-term monitoring program making regular atmospheric measurements from an instrument container installed monthly aboard a passenger aircraft. Typical cruising altitudes of the aircraft allow for the study of the free troposphere and the extra-tropical upper troposphere as well as the lowermost stratosphere. CARIBIC measurements include a number of real time analyses as well as the collection of aerosol and whole air samples. These whole air samples are analyzed post-flight for a suite of trace gases, which includes non-methane hydrocarbons (NMHC). The NMHC measurement system and its analytical performance are described here. Precision was found to vary slightly by compound, and is less than 2% for the C2–C6 alkanes and ethyne, and between 1% and 6% for C7–C8 alkanes and aromatic compounds. Preliminary results from participation in a Global Atmospheric Watch (WMO) VOC audit indicate accuracies within the precision of the system. Limits of detection are 1 pptv for most compounds, and up to 3 pptv for some aromatics. These are sufficiently low to measure mixing ratios typically observed in the upper troposphere and lowermost stratosphere for the longer-lived NMHC, however, in air samples from these regions many of the compounds with shorter lifetimes (<5 days) were frequently below the detection limit. Observed NMHC concentrations span several orders of magnitude, dependent on atmospheric region and air mass history, with concentrations typically decreasing with shorter chemical lifetimes.

Distribution and Abundance of Odonata Species Across Massachusetts: Results of a Long-term Monitoring Program

2016 ◽  
Vol 23 (4) ◽  
pp. 501-524 ◽  
Author(s):  
Robert Buchsbaum ◽  
Christopher W. Leahy ◽  
Taber Allison
Keyword(s):  
Monitoring Program ◽  
Long Term Monitoring ◽  
Term Monitoring

Census of the Brown Hare (Lepus europaeus) at Leveste, Municipality of Gehrden, Germany

2013 ◽  
pp. 168-171
Author(s):  
Gabor von Bethlenfalvy ◽  
Julia Hindersin ◽  
Egbert Strauß
Keyword(s):  
Arable Land ◽  
Monitoring Program ◽  
Lepus Europaeus ◽  
Brown Hare ◽  
Lower Saxony ◽  
Long Term Monitoring ◽  
Term Monitoring

The case study used spotlight strip census routes to estimate Brown Hare numbers in a 793 ha hunting district. The habitats, dominated by intensively farmed arable land were also mapped. This is part of a Germany-wide long-term monitoring program of game populations which is carried out by hunters and was initiated by the German Hunters’ Association and the Hunters’ Association of Lower Saxony in 2001.

scholarly journals Two practical approaches to monitoring the zooplanktonic community at Lago Grande do Curuai, Pará, Brazil

2015 ◽  
Vol 45 (3) ◽  
pp. 293-298 ◽  
Author(s):  
Leonardo Fernandes GOMES ◽  
Ludgero Cardoso Galli VIEIRA ◽  
Marie Paule BONNET
Keyword(s):  
Spatial Distribution ◽  
Monitoring Program ◽  
Zooplankton Community ◽  
Species Level ◽  
Genus Level ◽  
Time Costs ◽  
Financial Costs ◽  
Long Term Monitoring ◽  
Term Monitoring

The use of substitute groups in biomonitoring programs has been proposed to minimize the high financial costs and time for samples processing. The objectives of this study were to evaluate the correlation between (i) the spatial distribution among the major zooplankton groups (cladocerans, copepods, rotifers, and testaceans protozoa), (ii) the data of density and presence/absence of species, and (iii) the data of species, genera, and families from samples collected in the Lago Grande do Curuai, Pará, Brazil. A total of 55 sample of the zooplanktonic community was collected, with 28 samples obtained in March and 27 in September, 2013. The agreement between the different sets of data was assessed using Mantel and Procrustes tests. Our results indicated high correlations between genus level and species level and high correlations between presence/absence of species and abundance, regardless of the seasonal period. These results suggest that zooplankton community could be incorporated in a long-term monitoring program at relatively low financial and time costs.

scholarly journals Augmentation of a Long-term Monitoring Program for Lake George, NY by Citizen Volunteers

2004 ◽  
Vol 20 (2) ◽  
pp. 121-129 ◽  
Author(s):  
Charles W. Boylen ◽  
Eric A. Howe ◽  
Jeffrey S. Bartkowski ◽  
Lawrence W. Eichler
Keyword(s):  
Monitoring Program ◽  
Long Term Monitoring ◽  
Term Monitoring ◽  
Lake George

scholarly journals P286Safety and effectiveness of dabigatran relative to warfarin in routine care: final results from a long-term monitoring program

2018 ◽  
Vol 39 (suppl_1) ◽  
Author(s):  
C Gopalakrishnan ◽  
K F Huybrechts ◽  
A S Ortiz ◽  
K Zint ◽  
V K Gurusamy ◽  
...  
Keyword(s):  
Monitoring Program ◽  
Routine Care ◽  
Long Term Monitoring ◽  
Term Monitoring
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