Cyclone activity in the Arctic from reanalyses data and regional climate model simulations
The analysis of the cyclone characteristics and their intra- and interannual variations obtained from a regional climate model simulation for the Arctic (HIRHAM) with spectral nudging in comparison with reanalyses with different spatial resolution (ERA-Interim and ASR) for the period 2000-2009 was carried out. It is noted that the cyclones characteristics in the Arctic, especially their spatial distributions, annual and in-terannual variations from model simulations are generally consistent with those obtained from different reanalyses data, including the Arctic reanalysis (ASR). Differences are noted for the cyclone frequency, which might be related with different spatial resolution and with differences in detecting small cyclones, including polar mesocyclones. Models with a higher spatial resolution and with an adequate description of mesoscale processes in the Arctic are required to reproduce small-scale mesocyclones.