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During TRACER, the Texas A&M Rapid Onsite Atmospheric Measurements Van (ROAM-V) was deployed to capture airmasses behind (maritime) and ahead (continental) of the passage of the sea-breeze front through Houston. On select sampling days, ROAM-V sampled in the morning/mid-day on the coast and then transited to a second inland site for the afternoon/evening. The suite of instruments deployed on ROAM-V included a Condensation Particle Counter (CPC; GRIMM Model 5.403 CPC), Scanning Mobility Particle Sizer (SMPS; TSI 3750 detector, TSI 3082 classifier, TSI 3088 neutralizer, TSI 3081A Differential Mobility Analyzer), Cloud Condensation Nuclei counter (Droplet Measurement Technologies CCN Counter), micro pulse lidar (Droplet Measurement Technologies Micro Pulse LiDAR (mini-MPL)), and a Davis Rotating Uniform size-cut Monitor (DRUM; DRUMAir 4-DRUM). Before sampling at each location, the latitude and longitude were recorded using the GPS on the phone application “My Altitude”.
The mini-MPL deployed with ROAM-V is a 532 nm elastic and polarization lidar. The mini-MPL outputs normalized relative backscatter (NRB) derived from raw signal after after-pulse, overlap, and dead-time correction calibration. The depolarization ratio is calculated from the co-polarized and cross-polarized NRB (Flynna et al., 2007). The NRB and depolarization ratio data are resampled from the original data at 1-minute intervals. The vertical resolution of the mini-MPL data is 15 meters. The mini-MPL data can be used to determine the boundary layer, cloud top, and cloud bottom height and can be used to retrieve aerosol type and concentration profile.
This data was collected for ARM Field Campaign AFC07055 and supported by DOE ASR grant DE-SC0021047. For any further questions, please feel free to contact the instrument PI, Sarah D. Brooks, sbrooks@tamu.edu.
Flynna, C. J., Mendozaa, A., Zhengb, Y., & Mathurb, S. (2007). Novel polarization-sensitive micropulse lidar measurement technique. Optics express, 15(6), 2785-2790.
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| Investigator(s): | Sarah Brooks (sbrooks@tamu.edu) 0000-0001-8185-9332 Bo Chen (bchen112@tamu.edu) 0000-0003-0587-0446 |
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| Data Citation: | https://doi.org/10.5439/1972461 | ||||||||
| Data Format: | netcdf | ||||||||
| File Naming Convention: | tracer_tamu_YYMMDD_mini-mpl.nc, where YY = Year, MM = Month, DD = Day | ||||||||
| Abstract: | During TRACER, the Texas A&M Rapid Onsite Atmospheric Measurements Van (ROAM-V) was deployed to capture airmasses behind (maritime) and ahead (continental) of the passage of the sea-breeze front through Houston. On select sampling days, ROAM-V sampled in the morning/mid-day on the coast and then transited to a second inland site for the afternoon/evening. The suite of instruments deployed on ROAM-V included a Condensation Particle Counter (CPC; GRIMM Model 5.403 CPC), Scanning Mobility Particle Sizer (SMPS; TSI 3750 detector, TSI 3082 classifier, TSI 3088 neutralizer, TSI 3081A Differential Mobility Analyzer), Cloud Condensation Nuclei counter (Droplet Measurement Technologies CCN Counter), micro pulse lidar (Droplet Measurement Technologies Micro Pulse LiDAR (mini-MPL)), and a Davis Rotating Uniform size-cut Monitor (DRUM; DRUMAir 4-DRUM). Before sampling at each location, the latitude and longitude were recorded using the GPS on the phone application “My Altitude”. The mini-MPL deployed with ROAM-V is a 532 nm elastic and polarization lidar. The mini-MPL outputs normalized relative backscatter (NRB) derived from raw signal after after-pulse, overlap, and dead-time correction calibration. The depolarization ratio is calculated from the co-polarized and cross-polarized NRB (Flynna et al., 2007). The NRB and depolarization ratio data are resampled from the original data at 1-minute intervals. The vertical resolution of the mini-MPL data is 15 meters. The mini-MPL data can be used to determine the boundary layer, cloud top, and cloud bottom height and can be used to retrieve aerosol type and concentration profile. This data was collected for ARM Field Campaign AFC07055 and supported by DOE ASR grant DE-SC0021047. For any further questions, please feel free to contact the instrument PI, Sarah D. Brooks, sbrooks@tamu.edu. Flynna, C. J., Mendozaa, A., Zhengb, Y., & Mathurb, S. (2007). Novel polarization-sensitive micropulse lidar measurement technique. Optics express, 15(6), 2785-2790. |
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| Data Usage: | The netcdf file structure is as follows: netcdf file:/Users/bochen/TAMU/tamu_tracer/output/netcdf_output/tracer_tamu_[YYMMDD]_mini-mpl.nc { variables: long IOP_number; :long_name = "TRACER Texas A&M intensive observation period number"; group: [Location] { dimensions: range = 1328; time = 221; variables: double lat; :units = "degrees"; double lon; :units = "degrees"; double range(range=1328); :units = "km"; String datetimes(time=221); double seconds_passed_since_start(time=221); :units = "second"; :long_name = "seconds passed since [YY/MM/DD HH:MM:SS]"; double copol_nrb_data(range=1328, time=221); :unit = "(Counts*km²)/(μs*μJ)"; :long_name = "1 minute co-polarized normalized relative backscatter"; double crosspol_nrb_data(range=1328, time=221); :unit = "(Counts*km²)/(μs*μJ)"; :long_name = "1 minute cross-polarized normalized relative backscatter"; double depol_ratio_data(range=1328, time=221); :unit = "unitless (ratio)"; :long_name = "1 minute depolarization ratio"; } // global attributes: :title = "TRACER Campaign Texas A&M Mini Micropulse Lidar Data on [YYMMDD]"; } | ||||||||
| Data Credit: | DOE ASR grant DE-SC0021047 (PI: Anita Rapp) | ||||||||
| Arm Sites: | hou | ||||||||
| Content Time Range: | Begin: 2022-07-12 End: 2022-09-25 | ||||||||
| Data Type: | TAMU Mobile Facility Measurements during TRACER |
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| Use Restrictions: | No use constraints are associated with this data. | ||||||||
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