High-Resolution Numerical Weather Simulation at the South Shetland Islands, Antarctic, Using WRF

• Main Authors: Comin, Alcimoni Nelci, Acevedo, Otávio Costa, Souza, Ronald Buss de
• Format: Article in Journal/Newspaper
• Language: Portuguese
• Published: Universidade Federal do Rio de Janeiro 2016
• Subjects: WRF; High-resolution; South Shetland Islands; Polar Ship; Alta resolução; Ilhas Shetland do Sul; Navio Polar; Alta; Antarctic; Antarc*; Antarctica; Antártica
• Online Access: https://revistas.ufrj.br/index.php/aigeo/article/view/7020

This paper presents run high-resolution Weather Research and Forecasting (WRF) model in the region of South Shetland Islands, in Antarctica. Simulation model are compared to observations taken aboard a Polar Ship during the transect in this region. A total of 4 different simulations were performed, varying the number of points of the innermost domain 127 x 127 and 187 x 187 and two microphysics schemes. The results of air temperature and dew point are highly dependent on the size of the internal domain. When the small domain with points 127 are used, the model produces abrupt fluctuations of these variables and highly underestimates them in both settings. This can be attributed the sensitivity of the model to the transfer of information between the different nested grids. With larger innermost grid with points 187, such fluctuations no longer occur. The underestimation temperatures in the WRF model is associated with the deficiency representation on days with stratiform cloudiness. Days with middle-level clouds model the temperature tend to be better represented. The air pressure is adequately simulated with both domains, as it is more dependent on large-scale weather patterns, derived from the global model, which provides the boundary conditions. The small differences in air pressure among the simulations are a consequence of the dynamical adjustment of the model. The microphysics scheme WSM5 results were better than scheme WSM3 for all variables tested here. Este artigo apresenta simulações de alta resolução com o modelo Weather Research and Forecasting (WRF) para a Ilhas Shetland do Sul, na Antártica. Os dados observados são coletadas pelos sensores instalados no navio Polar durante o transecto nesta região. Este estudo incluiu quatro simulações diferentes; variando o número de pontos de grade no domínio interno entre 127 x 127 e 187 x 187 e duas configurações de microfísica. As simulações para a temperatura do ar e ponto de orvalho são altamente dependente do número de pontos de grade do domínio interno. ...