摘要：Planetary boundary layer (PBL), the lower few kilometers of the atmosphere over the surface of the earth plays an important role in the transportation of energy such as momentum, heat and moisture into the upper layers of the atmosphere. PBL flow is in general highly turbulent and showing distinct diurnal as well as seasonal variations. The simulation of boundary layer flow field parameters are very much important in various aspects of science and engineering and also plays an important role in the feed-back mechanisms of various scales of atmospheric motions from micro-scale turbulence to large-scale atmospheric mechanisms such as monsoons. Hence, in the present study an attempt has been made to evaluate the performance of five different PBL schemes [Yonsei University (YSU), Mellor-Yamada-Nakanishi-Niino (MYNN2), Mellor Yamada-Janjic (MYJ), Quasi Normal Scale Elimination (QNSE) and Asymmetric Convective Model (ACM2)] of Weather Research and Forecast (WRF-ARW) mesoscale model in simulating boundary layer flow parameters over Nagpur (21.15° N, 79.09° E) in Maharashtra. High resolution simulations (27, 9, and 3 with 27 vertical levels) are conducted with triple nested domains by using 1 × 1 degree NCEP Final Analysis meteorological fields for initial and boundary conditions. In the study, five fair weather days in winter (January 2009) with no significant synoptic activity are chosen. The present study conclude that the non-local PBL scheme YSU and local scheme MYJ could capture the characteristic variations of surface meteorological variables, vertical structure of atmospheric as seen in observations over the study region. This study advocates that YSU and MYJ schemes are very useful for the air pollution studies over the study region.
关键词：Planetary boundary layer; WRF-ARW model; Air pollution studies
