Preprints
https://doi.org/10.5194/egusphere-2024-868
https://doi.org/10.5194/egusphere-2024-868
24 Apr 2024
 | 24 Apr 2024

Improving the Estimate of Higher Order Moments from Lidar Observations Near the Top of the Convective Boundary Layer

Tessa Rosenberger, David D. Turner, Thijs Heus, Girish N. Raghunathan, Timothy J. Wagner, and Julia Simonson

Abstract. Ground-based lidar data have proven extremely useful for profiling the convective boundary layer (CBL). Many groups have derived higher order moments (e.g., variance, skewness, fluxes) from high temporal resolution lidar data using an autocovariance approach. However, these analyses are highly uncertain near the CBL top when the depth of the CBL (zi) is changing during the analysis period. This is because the autocovariance approach is usually applied to constant height levels and the character of the eddies are changing on either side of the changing CBL top. Here, a new approach is presented wherein the autocovariance analysis is performed on a normalized height grid, with a temporally smoothed zi. Output from a large eddy simulation model demonstrates that deriving higher order moments from time series on a normalized height grid has better agreement with the slab averaged quantities than the moments derived from the original height grid.

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Tessa Rosenberger, David D. Turner, Thijs Heus, Girish N. Raghunathan, Timothy J. Wagner, and Julia Simonson

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on egusphere-2024-868', Fleur Couvreux, 22 May 2024
  • RC1: 'Comment on egusphere-2024-868', Anonymous Referee #1, 06 Jun 2024
  • RC2: 'Comment on egusphere-2024-868', Anonymous Referee #2, 07 Jul 2024

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on egusphere-2024-868', Fleur Couvreux, 22 May 2024
  • RC1: 'Comment on egusphere-2024-868', Anonymous Referee #1, 06 Jun 2024
  • RC2: 'Comment on egusphere-2024-868', Anonymous Referee #2, 07 Jul 2024
Tessa Rosenberger, David D. Turner, Thijs Heus, Girish N. Raghunathan, Timothy J. Wagner, and Julia Simonson
Tessa Rosenberger, David D. Turner, Thijs Heus, Girish N. Raghunathan, Timothy J. Wagner, and Julia Simonson

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Short summary
This work used model output to show that considering the changes in boundary layer depth over time in the calculations of variables such as fluxes and variance yields more accurate results than cases where calculations were done at a constant height. This work was done to improve future observations of these variables at the top of the boundary layer.