WANG Shujie, DING Minghu, SUN Weijun, BIAN Lingen, LU Changgui, XIAO Cunde, WEI Ting, ZHANG Dongqi, ZHANG Tong, WANG Yetang, DOU Tingfeng
Based on the automatic weather station observation of Yellow River Station, AWIPEV and NPI, in Ny-Ålesund, Arctic, the statistical climate characteristics of Ny-Ålesund have been analyzed in this paper. Variations of temperature, specific humidity, air pressure, wind speed and direction are described in detail. The main objective is to further assess Arctic climate change based on these meteorological records in Ny-Ålesund. The results show that:1) The annual mean temperature was (-3.3±0.7)℃ during 2005-2014, and the highest monthly mean temperature occurs in July while the lowest occurs in March. It was also found that the warming rate of Ny-Ålesund (0.76±0.29)℃·(10a)-1 was around four times larger than the global mean (0.17±0.03)℃·(10a)-1 during 1975-2014. 2) The annual mean relative humidity was (75.9±1.0)% during 2005-2014, and the highest (lowest) monthly mean relative humidity appeared in August (April), one month later than the highest (lowest) monthly mean temperature. The annual mean specific humidity was (2.5±0.1) g·kg-1, with a positive increasing rate of (0.14±0.12) g·kg-1·(10a)-1 from 1994 through 2010. The annual air pressure was (1 008.2±2.1) hPa averaged from 2005 through 2014, with the highest monthly mean in May and the lowest one in December; diurnal variation of air pressure showed double peaks. 4) The annual wind speed was (3.3±0.3) m·s-1 averaged from 2006 through 2013. Due to the local environmental condition (e.g., topography, ice caps and glaciers) in Svalbard, the prevailing wind direction is southeast. In summary, a typical polar marine climate governed this area, and the special underlying surface, snow and ice in winter and polar tundra in summer, also had significant effect.