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Evaluation and Applications of Multi-Instrument Boundary-Layer Thermodynamic Retrievals

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Abstract

Recent reports have highlighted the need for improved observations of the atmosphere boundary layer. In this study, we explore the combination of ground-based active and passive remote sensors deployed for thermodynamic profiling to analyze various boundary-layer observation strategies. Optimal-estimation retrievals of thermodynamic profiles from Atmospheric Emitted Radiance Interferometer (AERI) observed spectral radiance are compared with and without the addition of active sensor observations from a May–June 2017 observation period at the Atmospheric Radiation Measurement Southern Great Plains site. In all, three separate thermodynamic retrievals are considered here: retrievals including AERI data only, retrievals including AERI data and Vaisala water vapour differential-absorption lidar data, and retrievals including AERI data and Raman lidar data. First, the three retrievals are compared to each other and to reference radiosonde data over the full observation period to obtain a bulk understanding of their differences and characterize the impact of clouds on these retrieved profiles. These analyses show that the most significant differences are in the water vapour field, where the active sensors are better able to represent the moisture gradient in the entrainment zone near the boundary-layer top. We also explore how differences in retrievals may affect results of applied analyses including land–atmosphere coupling, convection indices, and severe storm environmental characterization. Overall, adding active sensors to the optimal-estimation retrieval shows some added information, particularly in the moisture field. Given the costs of such platforms, the value of that added information must be weighed for the application at hand.

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Notes

  1. While the Raman lidar can provide partial profiles of temperature (Newsom et al. 2013) those data are not used in the AERIoe retrieval described in Sect. 2.4, since the comparison was relative to wvDIAL.

  2. Cloudy scenes were not controlled for in this analysis as those comparisons are reserved for Sect. 3.3.

  3. In these applications, convolving the radiosonde data with the averaging kernel would act to minimize the vertical representativeness error in the comparison of the AERIoe retrievals and the radiosonde profiles. The authors purposefully chose not to take this step. In this sort of analysis we feel it is important to evaluate the data as most users would encounter it. This does mean that our results may make the retrieval appear to fare less well than it may if the reference data were convolved with the averaging kernel. See Turner and Löhnert (2014).

  4. This is one of two physical constraints added to the retrieval, and the level below which it is applied is configurable by the user. The other constraint requires relative humidity be less than 100% (Turner and Blumberg 2019). Metadata about these settings can always be found in retrieval output.

  5. It is of note that different methods of computing convection indices, in this case SBCAPE, can result in widely varied results, as is apparent from comparing values derived from radiosonde data by the University of Wyoming archive (orange dots on Fig. 13) and by SHARPpy (blue dots and error bars on Fig. 13).

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Acknowledgements

E. N. Smith would like to acknowledge that most co-authors of this study are graduate students that chose to collaborate on this work as a voluntary side project related to their shared Boundary Layer, Urban Meteorology, and Land-Surface Processes Seminar course, bringing together varied expertise and offering new learning opportunities for all participants. Dr. Michael Coniglio provided a useful internal review to the paper. This work was partially supported by the DOE Atmospheric System Research (ASR) program via grants DE-SC0014375 and 89243019SSC000034, and by the NOAA Atmospheric Science for Renewable Energy (ASRE) program. This work was prepared by the authors with support from the NSSL Forecast Research and Development Division (ENS) and the NOAA/Office of Oceanic and Atmospheric Research under NOAA–University of Oklahoma Cooperative Agreement NA11OAR4320072, U.S. Department of Commerce (TMB, QN). The contents of this paper do not necessarily reflect the views or official position of any organization of the U.S. Government.

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Smith, E.N., Greene, B.R., Bell, T.M. et al. Evaluation and Applications of Multi-Instrument Boundary-Layer Thermodynamic Retrievals. Boundary-Layer Meteorol 181, 95–123 (2021). https://doi.org/10.1007/s10546-021-00640-2

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