Distribution of small plastic debris in cross-section and high strandline on Heungnam beach, South Korea     

Nak Won Heo  Sang Hee Hong  Gi Myung Han  Sunwook Hong  Jongmyoung Lee  Young Kyung Song  Mi Jang  Won Joon Shim 《Ocean Science Journal》2013,48(2):225-233

The spatial distribution of small plastic debris on Heungnam beach in February 2011 was investigated. The abundances of small plastic debris over 2 mm in size along the high strandline and cross-sectional line of the beach were determined. The mean abundances of small plastics were 976 ± 405 particles/m² at the high strandline in the upper tidal zone along the shoreline and 473 ± 866 particles/m² at the cross-section perpendicular to the shoreline. Specifically, styrofoam (expanded polystyrene) spherules accounted for 90.7% of the total plastic abundance in the high strandline and 96.3% in the cross-section. The spatial distribution patterns of small plastic debris differed between the high strandline and cross-sectional line. The cross-sectional distribution of small plastic abundance differed among plastic types, indicating that representative sampling of small plastic debris on a beach is necessary.  相似文献   

通辽市R_(5d)的气候特征分析     

邵学鹏  郭颖  高艳玲  姜秀萍 《内蒙古气象》2013,(1):26-28

文章利用通辽市境内科尔沁区、开鲁、鲁北、保康、甘旗卡、库伦、大沁他拉七个测站53a(1959—2011年)逐日降水量资料进行通辽市连续5d最大降水量(R5d)的气候特征分析,结果表明,通辽市R5d为减小趋势,在0.05显著性水平以上,倾向率为-4.56mm/10a,各站R5d均为减少趋势,其中库伦、开鲁、科尔沁区的倾向率为-7.0^-5.64mm/10a,减少较为明显;R/S分析结果为,全市及各站均符合赫斯特现象,H指数>0.5,未来将持续减少,其中鲁北、科尔沁区、开鲁的H指数较大,维持减少趋势将较为强劲;M-K突变检测发现,R5d在1965年发生突变,此后UF下降趋势超过了0.001极显著水平。  相似文献