Subjects: Geosciences >> Atmospheric Sciences submitted time 2023-12-16 Cooperative journals: 《干旱区研究》
Abstract： This study used the Sen+M-K trend analysis, the gravity center movement model, the standardizedregression coefficient, and the spatial clustering methods to reveal the spatial characteristics of the variation,trends, and movement of dust days of various types and the contribution rate of their influencing factors in theTarim Basin based on the annual data of 32 meteorological stations between 1964 and 2022. The resultsindicated: (1) Floating dust, followed by blowing sand and sandstorms, dominate the Tarim Basin, showing aspatial distribution pattern of more in the south and less in the north, and the dust days of various types showsignificantly decreasing trends. (2) The gravity centers of dust days of various types in the Tarim Basin tended tomove southeast, and the gravity center of sandstorm days moved the most. (3) Warmer temperatures, lower windspeeds, and fewer gale days were the main factors in the decreased dust days in the Tarim Basin, whereasprecipitation had the least influence. (4) The high contribution rates of precipitation to dust days are clustered inthe western part of the Tarim Basin, mean temperature and mean maximum temperature in the southern andwestern parts, respectively, and gale days and mean wind speed in the northwestern and southeastern parts,respectively. This study’s results can provide a scientific basis for developing regionally applicable windbreakingand sand-fixing measures in the Tarim Basin.
Subjects: Geosciences >> Geography submitted time 2020-11-24 Cooperative journals: 《干旱区地理》
Abstract： 利用新疆1954—2018年雪灾资料分析其灾害时空特征，时间上雪灾灾损强度在90年代后出现明显加大，2010年出现跃增特点，空间上雪灾灾损强度新疆西部多于东部，北部多于南部，山区多于盆地或平原。用雪灾出现次数、房屋倒塌间数、牲畜棚圈倒塌间数、损坏大棚数、死亡牲畜数、受灾面积、经济损失等多指标综合分析法来客观构建灾损指数，符合[Γ分布的灾损指数结合F分布函数能客观的描绘出雪灾等级，分为一般、较重、严重、特重4个等级。根据构建的雪灾等级，发现新疆雪灾特重灾区集中在天山山区及其以北地区，南疆仅有喀什地区为特重灾区。
Subjects: Geosciences >> Geography submitted time 2020-06-02 Cooperative journals: 《干旱区地理》
Abstract： 风云三号D星(FY-3 D)是我国新一代极轨气象卫星，中分辨率光谱成像仪II ( MERSI- II )是其携带的核心传感器之一，MERSI- }实现了云、气溶胶、水汽、陆地表面特性、海洋水色等大气、陆地、海洋参量的高精度定量反演。选取2018年大8月无云时相的FY-3 D/MERSI- II数据对天山中段终年积雪进行归一化积雪指数(vDSI)的计算。结合高分辨率Landsat-8影像，利用混淆矩阵对FY-3D/MERSI- II数据计算结果与同期MODIS日积雪产品数据MOD10A1进行精度对比分析。结果表明:FY-3 D/MERSI- II图像平均总体精度为0. 855 , MOD10A1图像平均总体精度为0. 820 ,FY-3 D/MERSI- }积雪覆盖提取平均总体精度比MOD10A1积雪覆盖提取平均总体精度高0. 035FY-3 D/MERSI- II的K内>pa系数平均值为0. 659 , MOD10A1的K句>pa系数平均值为0. 558 , FY-3 D/MERSI- II的K内>pa系数平均值大于MOD10A1的K内>pa系数平均值。故FY-3 D/MERSI- II数据提取积雪覆盖面积精度更高，更接近高分辨率Landsat-8影像目视解译结果。
Subjects: Geosciences >> Geography submitted time 2020-01-06 Cooperative journals: 《干旱区地理》
Abstract：利用2010—2017年1~12月新疆喀什地区10个气象站逐小时降水资料，分析统计喀什地区近8 a降雨雪（以下统称降水）日变化特征。结果表明：（1） 喀什地区全年降水量和降水频次日变化存在明显的波动，总体上呈现“正弦波”一峰一谷特征，降水量峰值出现在03:00（北京时，下同），谷值出现在18:00；降水频次峰值出现在04:00，谷值出现在18:00；两者峰谷值出现时间接近。（2） 2010—2017年喀什地区全年降水量和降水频次呈明显的增加趋势；而降水强度年际变化趋于平缓，无明显变化。（3） 降水强度日变化趋势与降水量、降水频次并不存在一致性。（4） 喀什地区全年降水主要以短时段降水为主，其中，持续1 h降水次数为最大值，但降水量和贡献率最大值却同出现在2 h和6 h持续降水中。全年降水主要以后半夜和上午开始的降水过程为主导，且仍主要为短时段降水。
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