Name: Yasmin Kaore Lago Kitagawa
Type: MSc dissertation
Publication date: 26/02/2018
Advisor:

Namesort descending Role
Davidson Martins Moreira Advisor *

Examining board:

Namesort descending Role
Davidson Martins Moreira Advisor *

Summary: Exchanges of moisture, heat, and momentum occur within the planetary boundary layer (PBL) through mixing associated with turbulent eddies that influence the way in which lower-tropospheric thermodynamic and kinematic structures evolve. However such eddies operate on spatiotemporal scales that cannot be explicitly represented on grid scales and time steps employed in most mesoscale models. As such, their effects are expressed in these models via the use of PBL parameterization schemes. In this way, the present work used the Weather Research and Forecasting (WRF) model to find a set of physical parameterization that represents the local atmospheric circulation of the Metropolitan Region of Salvador (RMS); for that, six PBL schemes were evaluated – Boucheau e Lacarrere (BOU), Grenier e Bretherton (GBM), Mellor-Yamada-Janjić (MYJ), Mellor-Yamada-Nakanishi-Niino (MYNN2), Bretherton e Park (UW) e Yonsei University (YSU).The RMS was chosen because there was no previous work performing any assessment in this area using WRF model.The model performance was performed using statistical metrics of mean bias (MB), root mean square error (RMSE), mean absolute gross error (MAGE), correlation coefficient (r) and index of agreement (IOA) between simulated and observed data in the surface meteorological stations of the region through the meteorological variables air temperature at 2 meters (T2), wind speed and direction at 10 meters (WS10 and WD10). MYJ scheme show the best performance for WS10 and T2 while for WD10, it was the BOU and UW schemes. However, it is worth to point out that results indicate that there were no statistically significant differences using different PBL schemes considering the period analyzed. Qualitative analysis of PBL heights (PBLH) and vertical profiles of water vapor, potential temperature and wind speed and direction were also made, it was observed that the model produces low values of PBLH and does not produce good results for vertical profiles. In addition, a hypothetical case study using the CMAQ model was done to evaluate the impact of atmospheric emissions from stacks held in Camaçari Industrial Complex over the RMS, some difficulties were faced due to the lack of information about the emissions sources of the region; the assessment of the WRF’s ability to forecast a short-time period (24-hour) during a subtropical storm occurring in the region also was performed, it was inferred that the model showed good results for the wind fields for the episode under analysis.

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