CAJ | 학술논문

将2001-2008年分为沙尘天气相对多年和相对少年，计算兰州市春季逐日4个时次的4d气团后向轨迹。通过聚类分析得到春季到达兰州市区的主要气团轨迹组，结合可吸入颗粒物PM10日均质量浓度资料，通过计算潜在源贡献因子PSCF（potential source contribution function）和浓度权重轨迹CWT（concentration-weighted trajectory），得到影响兰州市春季PMlo质量浓度的潜在源区以及不同源区对兰州市春季PM10质量浓度贡献的差异。结果表明，在沙尘天气相对多年，西路径和西北路径发生比例最高，分别占总轨迹的33％和19．4％，其中有50％以上为污染轨迹，是造成兰州市春季高质量浓度PM10污染的主要输送路径。沙尘天气相对少年的主要输送路径是西路径，其次是北路径，分别占23．6％和18％。影响兰州市春季大气PM10质量浓度的潜在源区分布在新疆塔里木盆地、吐鲁番盆地、青海柴达木盆地、甘肃河西走廊、内蒙古中部和西部的沙漠戈壁地区。
장2001-2008년분위사진천기상대다년화상대소년，계산란주시춘계축일4개시차적4d기단후향궤적。통과취류분석득도춘계도체란주시구적주요기단궤적조，결합가흡입과립물PM10일균질량농도자료，통과계산잠재원공헌인자PSCF（potential source contribution function）화농도권중궤적CWT（concentration-weighted trajectory），득도영향란주시춘계PMlo질량농도적잠재원구이급불동원구대란주시춘계PM10질량농도공헌적차이。결과표명，재사진천기상대다년，서로경화서북로경발생비례최고，분별점총궤적적33％화19．4％，기중유50％이상위오염궤적，시조성란주시춘계고질량농도PM10오염적주요수송로경。사진천기상대소년적주요수송로경시서로경，기차시북로경，분별점23．6％화18％。영향란주시춘계대기PM10질량농도적잠재원구분포재신강탑리목분지、토로번분지、청해시체목분지、감숙하서주랑、내몽고중부화서부적사막과벽지구。
Three-dimensional 4-day backward trajectories arriving in Lanzhou at 500m high were calcu- lated every 6 h by using HYSPLIT-4 trajectory model in spring of 2001 to 2008. The 8 years were di-vided into two categories：high dust year （2001,2002,2004 and 2006） and low dust year （2003,2005, 2007 and 2008 ）. Cluster analysis, potential source contribution function （PSCF） model, and concentra- tion-weighted trajectory （CWT） method were used to evaluate the transportation pathways and poten-tial source regions of Lanzhou PM10 pollution in spring. Results indicate that the western and northwest-ern pathways, respectively accounting for 33% and 19.4% of all trajectories, were major pathways leading to high springtime PM10 loadings in Lanzhou in 2001,2002,2004 and 2006. However, the major pathways were the western and the northern pathways in 2003,2005,2007 and 2008, accounting for 23.6% and 18% ,respectively. There were six potential source regions that had effect on PM10concen-tration in Lanzhou, including Tarim Basin and Turpan Basin in Xinjiang, Qaidam Basin in Qinghai, Hexi Corridor in Gansu Province, the desert and gobi area in central and western Inner Mongolia.