Based on the NECP/NCAR reanalysis dataset, associations between number of cold days (NCD) over East Asia (100–150° E, 25–55° N) and Arctic Oscillation (AO)/Arctic warming during 1956–2015 are explored. The results show NCD was closely associated with AO 1956–1990 1991–2015. It reveals showed a downward trend significantly negative correlation in previous stage, while it presented an upward nota...

The statistics of surface air temperature observations obtained from buoys, manned drifting stations, and meteorological land stations in the Arctic during 1979–97 are analyzed. Although the basic statistics agree with what has been published in various climatologies, the seasonal correlation length scales between the observations are shorter than the annual correlation length scales, especiall...

Abstract Current understanding of the cold season Arctic oscillation (AO) impact on summertime sea ice is revisited in this study by analyzing role from each month. Earlier studies examined prolonged AO using a smooth average over 1–2 seasons (e.g. December–March, December–April, March–May), ignoring large month-to-month variability. This finds that March most influential loss. First, highly ne...