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Aerosol lidar observations of atmospheric mixing in Los Angeles: Climatology and implications for greenhouse gas observations
| Content Provider | Semantic Scholar |
|---|---|
| Author | Ware, John Kort, Eric A. DeCola, Phil |
| Copyright Year | 2016 |
| Abstract | Atmospheric observations of greenhouse gases provide essential information on sources and sinks of these key atmospheric constituents. To quantify fluxes from atmospheric observations, representation of transport-especially vertical mixing-is a necessity and often a source of error. We report on remotely sensed profiles of vertical aerosol distribution taken over a 2 year period in Pasadena, California. Using an automated analysis system, we estimate daytime mixing layer depth, achieving high confidence in the afternoon maximum on 51% of days with profiles from a Sigma Space Mini Micropulse LiDAR (MiniMPL) and on 36% of days with a Vaisala CL51 ceilometer. We note that considering ceilometer data on a logarithmic scale, a standard method, introduces, an offset in mixing height retrievals. The mean afternoon maximum mixing height is 770 m Above Ground Level in summer and 670 m in winter, with significant day-to-day variance (within season σ = 220m≈30%). Taking advantage of the MiniMPL's portability, we demonstrate the feasibility of measuring the detailed horizontal structure of the mixing layer by automobile. We compare our observations to planetary boundary layer (PBL) heights from sonde launches, North American regional reanalysis (NARR), and a custom Weather Research and Forecasting (WRF) model developed for greenhouse gas (GHG) monitoring in Los Angeles. NARR and WRF PBL heights at Pasadena are both systematically higher than measured, NARR by 2.5 times; these biases will cause proportional errors in GHG flux estimates using modeled transport. We discuss how sustained lidar observations can be used to reduce flux inversion error by selecting suitable analysis periods, calibrating models, or characterizing bias for correction in post processing. |
| Starting Page | 9862 |
| Ending Page | 9878 |
| Page Count | 17 |
| File Format | PDF HTM / HTML |
| PubMed reference number | 5101844 |
| Volume Number | 121 |
| Journal | Journal of geophysical research. Atmospheres : JGR |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Advance Directive - Proxy Aerosol Dose Form Choose (action) Composition Concentrate Dosage Form Distance Emission - Male genitalia finding Estimated Flux Gases Health Insurance Portability and Accountability Act Height Heterophils/100 leukocytes:NFr:Pt:Bld:Qn Hypoxylon sp. CL51 Inference Nevus Projections and Predictions Sample Variance Sampling - Surgical action Stratification attribution hemoglobin D Punjab |
| Content Type | Text |
| Resource Type | Article |
