Table of Contents
Atmospheric Chemistry and Instrumentation Lab (CH423)
The Atmospheric Chemistry and Instrumentation Laboratory (CH423) is used to conduct bench-top experiments, calibrate instruments, and monitor the atmosphere. CH423 has three full height workbenches and four half-height wall benches. All benches have access to A/C power and wired internet. Pumps and compressors are available to supply vacuum and compress air. A 1.5 inch tube provides the ability to sample outside air. A fume hood (width 62-65 inch,depth 22 inch, height 36-40 inch) vents air outside the lab. Holders are available for three full size gas cylinders. Windows computers, along with an M200 Science Engineering Associates Data Acquisition System are available to collect data. Labview data acquisition software is available on lab desktop computer. Pressure, volumetric flow, temperature and dew point temperature standards are available.
Air Quality Monitoring
The Air Quality Monitoring system consists of the TEOM 1405, TEOM 1405DF, 49C O3 Analyzer, 42C NOx Analyzer, 43C SO2 Analyzer, and the CPC instruments. The sample head draws in both PM 1.0 and PM 2.5 to the instruments. PM 2.5 only goes through the TEOM 1405DF while PM 1.0 flows through all of the instruments. The TEOM models measure the particulate matter mass concentrations as the ambient air drawn through the sample head. The gas analyzers calculate the concentration of each gas.
Software
Manuals
Parts List
Results
Poster
Instrument Maintenance
TEOM maintenance requires biweekly change in filters or as seen fit. All other maintenance should be kept recorded in the TEOM logbook found in the laboratory DMT CCNC requires regular water bottle change. Pure water should be used. Pure water to refill the water jug can be obtained from Abbot Hall from the chemistry labs. Ozone Analyzer (Model 49C) Maintenance includes Zero and span calibration performed on 08/10/17 using the Dasibi 1008-PC zone generator. Calibration setup can be found in the ozone instrument files in the citation2 network
Instrument Real-time Data
Data from the TEOM, DMT CCNC, Thermo Scientific 49C Ozone Analyzer, and the sonic anemometer (Clifford 601 Penthouse) are plotted with Python scripts and displayed at http://aerosol.atmos.und.edu/CliffordHallMeasurements.html . The individual Python scripts have their own directories in /nas/software/ on the Plume server, where the scripts are executed by the cron.
Sonic Anemometer (Winds)
The process_wind.py script reads wind data files from the /nas/WindData/ directory and generates plots of wind speed and direction. The image files are saved to the directory the script is run from.
Syntax
/nas/software/process_wind/process_wind.py recent <amount of time in 5 minute increments>
The wind data is saved to a new file in /nas/WindData/ every 5 minutes, so the script reads the number of files that corresponds to the amount of time passed as an argument.
Example
To get the last 60 minutes of data:
/nas/software/process_wind/process_wind.py recent 60
This will save images named “clifford_60min_windspd.png” and “clifford_60min_winddir.png” that contain 1-second data.
24 Hour Averaged Data
When plotting 24 hours of wind data, the data from each 5-minute file is averaged to make a cleaner plot. To plot the last 24 hours of data:
/nas/software/process_wind/process_wind.py recent 1440
This creates images named “clifford_1440min_windspd.png” and “clifford_1440min_winddir.png”
Real-time Set-Up
Cloud Condensation Nuclei (CCN) Counter
The process_CCN.py script reads data from the latest DMT CCNC data files and makes plots of number concentration, instrument temperatures (OPC, T1, T2, and T3), flow rates (sample flow and sheath flow), and 1st stage monitor.
Syntax
/nas/software/process_CCN/process_CCN.py [optional DMT CCNC data file]
When run without any extra arguments, the script finds the most recently edited file in the CCN data directory /nas/und/NorthDakota/2017/CliffordHall_423/DMT_CCNC/ and creates the plots CCN.png, CCN_Temps.png, CCN_FlowRates.png, and CCN_1stStageMon.png. These images are saved to the directory that the script is run from.
Example
To make plots with the newest CCN data:
/nas/software/process_CCN/process_CCN.py
The plots are generated and saved in the working directory.
To make plots with the CCN data file /nas/und/NorthDakota
/2017/CliffordHall_423/DMT_CCNC/CCN\ data\ 170918192811.csv: /nas/software/process_CCN/process_CCN.py /nas/und/NorthDakota /2017/CliffordHall_423/DMT_CCNC/CCN\ data\ 170918192811.csv
This saves images titled 170918192811_CCN.png, 170918192811_CCN_Temps.png, 170918192811_CCN_FlowRates.png, and 170918192811_CCN_1stStageMon.png.
Real-time Setup
The data on the CCN counter is recorded in the c:\CCN DATA director. The c:\CCN Data director is shared on the network as CCN_DATA. The server running the script to create files should mount this directory to the serviers (e.g. plume.atmos.und.edu). For example, mount.cifs -o user=administrator 134.129.222.143/CCN_DATA /CCN_DATA
Ozone Analyzer
The process_ozone.py script reads data from the Thermo Scientific 49C Ozone Analyser files and generates plots of ozone mixing ratio, instrument temperatures (bench temp, lamp temp), flow rates, and chamber pressure.
Syntax
/nas/software/process_ozone/process_ozone.py [optional ozone data file]
When run without any extra arguments, the script finds the most recently edited file in the ozone data directory /nas/und/NorthDakota/2017/CliffordHall_423/OzoneAnalyzer_49C/iPort/ and creates the plots clifford_ozone_MixingRatio.png, clifford_49C_Temps.png, clifford_ozone_FlowRates.png, and clifford_ozone_.png. These images are saved to the directory that the script is run from.
Example
To make plots with the newest ozone data:
/nas/software/process_ozone/process_ozone.py
The plots are generated and saved in the working directory.
To make plots with the ozone data file /nas/und/NorthDakota/2017/CliffordHall_423/OzoneAnalyzer_49C/iPort/49C_091317_2126.dat:
/nas/software/process_CCN/process_CCN.py /nas/und/NorthDakota/2017/CliffordHall_423/DM
This saves images titled 170918192811_CCN.png, 170918192811_CCN_Temps.png, 170918192811_CCN_FlowRates.png, and 170918192811_CCN_1stStageMon.png.
Real-time Setup
To reconnect the instrument for real-time data collection use the iport software (iport32 Shortcut) on lab computer desktop.
TEOM
Real-time Setup
The real-time system setup involves the following steps. Execute the eport software on lab PC.
- Select the “ePort” icon on lab computer desktop.
- Select to open Saved Configuration file in c:\Thermo\ePort\Config\TEOM_DF.xlm
Setup the “Next download” by selecting the “Edit” button under Download Details section.
Data Pipiline Workflow
- Raw data is saved to the Atmospheric Science server (Aircraft) via a mount drive (/nas/realtime/realtime_*).
- Scripts (/nas/software/process_*) are executed on the server (Plume) via a crontab (user delene).
- Plots are uploaded to the Website (Atlantis).