Impacts of vertical resolution on the coupling of the PBL with the surface and the free atmosphere

Richard Marcelain1, Xubin Zeng1
1Department of Hydrology and Atmospheric Sciences, University of Arizona

The planetary boundary layer (PBL) is the lowest part of the troposphere, where the Earth’s surface has a direct influence on the atmosphere. Over land, the PBL is observed to be strongly influenced by the diurnal cycle of solar heating with a sub-hourly response to thermal radiation. The depth of the PBLH is most often characterized by the height of the planetary boundary layer (PBLH), which is the level where continuous turbulence stops, separating the PBL from the free atmosphere. Understanding of the PBL is important for weather forecasting, dispersion of air pollutants, monitoring water resources, changes to marine and terrestrial ecosystems and climate prediction. Given its importance, models still struggle to accurately represent and predict the PBL. To investigate where models can improve PBL parameterizations, we evaluate vertical resolutions on the coupling of the PBL with the surface and the free atmosphere using in-situ measurements, reanalysis products and remote sensing products. Evaluation of co-located datasets between various assimilation products during the first week of January and July of 2020 across various climate regimes will give us insight into when and where coarse vertical resolutions can be most useful for future PBL studies.

Go to All Abstracts | 2021 El Día Home Page