【摘要】 利用青藏高原83个气象台站的逐日积雪观测资料,充分考虑每次降雪过程所引起的积雪变化,建立了该地区1960—2007年度的区域性积雪增量序列,并讨论了其长期变化特征。结果表明:(1)积雪增量序列具有其他积雪参数指标的代表性,又较其他积雪参数指标序列有明显的统计学优点。(2)在48个年度里,1960—1966年度青藏高原区域性积雪增量处于负位相,1967—1998年度为多雪的正位相,1999—2007年度又为少雪的负位相,其中1998年度是个具有显著性的突变点。更多还原

【Abstract】 Based on the snow depth observation data from 83 high-elevation meteorology stations located in the Qinghai-Tibet Plateau during 1959-2007,the time series of regional snow depth increment that shows the snow depth variation with every snowfall events has been constructed.The results show that(1) comparing with the monthly or annual maximum snow depth and the accumulated snow depth series,the new series can represent the two others,has excellent features in statistics,and is the most stable one;and(2) the regional snow depth increment is keeping a negative phase during 1960-1966,a positive side during 1967-1998 and a negative phase again since 1999,and there is a significant jump point in the snow depth increment series that appears in 1998.更多还原