CAJ | 학술논문

黄土高原现代天然降尘的季节性变化研究表明，矿物粉尘是天然粉尘的主要组成成分，有机质和污染物以夏季粉尘中含量最高。粉尘的磁化率在80～150单位之间，明显高于冰期黄土，指示着间冰期时原始粉尘的磁化率就已受到气候条件的影响。粉尘沉积通量的季节性变化在高原北部较大，中部和南部变化较小，年累积通量也是北部明显高于基本相当的其它地区。分析粉尘沉积的气候过程认为，黄土高原的天然降尘主要表现为常态存在的非尘暴降尘，大部分为近距离低空再搬运粉尘，其沉积通量与地表的干燥度密切相关，部分来自内陆远源沙漠，通过高空西风气流转输。冬季风粉尘在大部分黄土高原略高于其它季节粉尘，而在西北部显著增高。
황토고원현대천연강진적계절성변화연구표명，광물분진시천연분진적주요조성성분，유궤질화오염물이하계분진중함량최고。분진적자화솔재80～150단위지간，명현고우빙기황토，지시착간빙기시원시분진적자화솔취이수도기후조건적영향。분진침적통량적계절성변화재고원북부교대，중부화남부변화교소，년루적통량야시북부명현고우기본상당적기타지구。분석분진침적적기후과정인위，황토고원적천연강진주요표현위상태존재적비진폭강진，대부분위근거리저공재반운분진，기침적통량여지표적간조도밀절상관，부분래자내륙원원사막，통과고공서풍기류전수。동계풍분진재대부분황토고원략고우기타계절분진，이재서북부현저증고。
Present aeolian dust is collected at 7 sites in different partsof the Loess Plateau of China. Investigation on the composition indicates that mineral dust makes up the dominant part of the dust. Magnetic susceptibility of the dust varies in range of 80～150 units (10－8m3/kg), which is higher than that of glacial loess. The high susceptibility of present dust implies that original material of dust has been modified to certain extent by climatic condition. Seasonal variability of dust input flux exhibits a gentle decrease from northwest to southeast with strong seasonal variety in the northern margin of the Loess Plateau. Accumulated input flux of the dust remains consistent over most regions except for northern part where possesses obvious high input flux. Meteorological analysis on transportation and deposition process reveals that most dust material is produced in non-storm deposition rather than in dust storm deposition. Aeolian dust is mainly transported by low level winds in step-wise way to deposit in destination sites, and therefore its input flux offers an indicator to ground aridity of depositional as well as the source areas. Long-suspension dust from desert regions plays an important role in fine port of the aeolian dust. Compared to the other seasons, dust flux resulted from winter monsoon rises obviously in the northwestern part of the Loess Plateau, whereas other parts possess limited increase of dust input.