| Full text | |
| Author(s): |
Park, Hyungwon John
[1]
;
Sherman, Thomas
[2, 3]
;
Freire, Livia S.
[4]
;
Wang, Guiquan
[2]
;
Bolster, Diogo
[2]
;
Xian, Peng
[5]
;
Sorooshian, Armin
[6]
;
Reid, Jeffrey S.
[5]
;
Richter, David H.
[2]
Total Authors: 9
|
| Affiliation: | [1] Univ Notre Dame, Dept Aerosp & Mech Engn, Notre Dame, IN 46556 - USA
[2] Univ Notre Dame, Dept Civil & Environm Engn & Earth Sci, Notre Dame, IN 46556 - USA
[3] FTS Int LLC, Dulles, VA - USA
[4] Univ Sao Paulo, Inst Math & Comp Sci, Sao Carlos - Brazil
[5] US Naval Res Lab, Monterey, CA - USA
[6] Univ Arizona, Dept Chem & Environm Engn, Tucson, AZ - USA
Total Affiliations: 6
|
| Document type: | Journal article |
| Source: | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES; v. 125, n. 19 OCT 16 2020. |
| Web of Science Citations: | 1 |
| Abstract | |
In an effort to better represent aerosol transport in mesoscale and global-scale models, large eddy simulations (LES) from the National Center for Atmospheric Research (NCAR) Turbulence with Particles (NTLP) code are used to develop a Markov chain random walk model that predicts aerosol particle profiles in a cloud-free marine atmospheric boundary layer (MABL). The evolution of vertical concentration profiles are simulated for a range of aerosol particle sizes and in a neutral and an unstable boundary layer. For the neutral boundary layer we find, based on the LES statistics and a specific model time step, that there exist significant correlation for particle positions, meaning that particles near the bottom of the boundary are more likely to remain near the bottom of the boundary layer than being abruptly transported to the top, and vice versa. For the unstable boundary layer, a similar time interval exhibits a weaker tendency for an aerosol particle to remain close to its current location compared to the neutral case due to the strong nonlocal convective motions. In the limit of a large time interval, particles have been mixed throughout the MABL and virtually no temporal correlation exists. We leverage this information to parameterize a Markov chain random walk model that accurately predicts the evolution of vertical concentration profiles. The new methodology has significant potential to be applied at the subgrid level for coarser-scale weather and climate models, the utility of which is shown by comparison to airborne field data and global aerosol models. (AU) | |
| FAPESP's process: | 18/24284-1 - Study on exchanges between Earth's surface and atmosphere using Large-Eddy Simulation |
| Grantee: | Livia Souza Freire Grion |
| Support Opportunities: | Research Grants - Young Investigators Grants |