Subjects: Geosciences >> Atmospheric Sciences submitted time 2023-02-27 Cooperative journals: 《干旱区地理》
Abstract： Solar radiation is the primary energy source of the earth’s system and is closely related to human life. By selecting the monthly sunshine hour data of 50 meteorological observation stations in the Qinghai Plateau of China from 1961 to 2020, the spatiotemporal variation characteristics of sunshine hours in the Qinghai Plateau as a whole, different latitudes, and different altitudes were analyzed. The results are as follows: (1) The annual sunshine hours in the Qinghai Plateau exhibit a significant downward trend from 1961 to 2020, and a sudden decrease occurred in 2004. From the perspective of spatial distribution, the annual sunshine hours in other regions showed a significant decreasing trend except that the sunshine hours in some southern stations is flat or slightly increased. And the decreasing trend is most significant in Qaidam area and eastern agricultural area. (2) The decreasing trend of sunshine hours in high-latitude areas is significantly greater than that in low-latitude areas of the Qinghai Plateau. The variation trend of sunshine hours at different latitudes in spring is small. In summer and winter, the decreasing trend of sunshine hours at relatively high latitudes is significantly greater than that at low latitudes, and in autumn, the decreasing trend of sunshine hours at low and high latitudes is significantly greater than that at middle latitudes. (3) The decreasing trend of annual sunshine hours in relatively low-altitude areas of the Qinghai Plateau is significantly greater than that in relatively high-altitude areas. The change trend of sunshine hours at different altitudes in spring is small, flat, or slightly reduced. The decreasing trend of sunshine hours at relatively low altitudes is significantly greater than that at higher altitudes in summer and winter. The sunshine hours at different altitudes in autumn exhibit a decreasing trend, but there is a significant difference in the decreasing trend.
Subjects: Geosciences >> Atmospheric Sciences submitted time 2021-10-10 Cooperative journals: 《干旱区地理》
Abstract： 利用 2018 年 3 月 1 日—2020 年 2 月 29 日京藏高速柴达木腹地路段新建的伊克高里、宗加镇 和大格勒 3 个交通自动观测站逐日气象资料，分析了四季路面温度和气温逐小时变化特征，统计了 路面最高、最低温度和最高、最低气温之间的相关关系，建立了 3 站四季路面最高温度和最低温度 分别与最高气温和最低气温相关性方程，旨在为路面温度精细化预报服务提供参考。结果表明： 京藏高速柴达木腹地路段伊克高里、宗加镇和大格勒 3 站路面温度和气温不同季节具有明显的日变化特征，路面温度和气温达到最低值和最高值的时间并不是完全相同。3 站路面温度09:00后上升速度均比气温上升速度快，路面温度升温位相较气温均超前，10:00—18:00期间各站路面温度与气温差别均较大。伊克高里站平均路面温度始终低于宗加镇和大格勒站路面平均温度。3站平均气温变化趋势比较一致，冬季和秋季平均气温昼夜差异明显。应用统计学方法建立的伊克高里、宗加镇和大格勒最高和最低路面温度与最高和最低气温相关性方程具有很好的实际应用价值，可 在实际业务工作中推广应用。
Subjects: Geosciences >> Geography submitted time 2021-06-13 Cooperative journals: 《干旱区研究》
Abstract：利用1961—2019年黄河上游河源区13个气象观测站逐日地面降水和唐乃亥水文站径流量数据，采用统计分析方法分析黄河上游河源区不同量级降水对径流变化的影响，研究表明：（1）黄河上游河源区1961—2019年降水量变化率为7.57 mm·(10a)-1。尤其是进入21世纪，黄河上游河源区气候暖湿化加快，降水量呈显著性增加趋势；（2）1961—2000年黄河上游河源区各地年总降水量、≥5.0 mm、≥10.0 mm、≥25.0 mm的降水量呈微弱增加趋势，而2001—2019年呈显著增加趋势，分别增加5.1%、6.9%、7.4%、15.0%；（3）1961—2019年黄河上游河源区≥5.0mm、≥10.0 mm、≥25.0 mm降水贡献率分别为71%、43%、7%，呈增加趋势，2001—2019年比1961—2000年降水量贡献率分别增加了1.5%、1.2%、0.8%；（4）年降水量与年径流量变化成显著正相关，年总降水量、≥5 mm、≥10 mm和≥25 mm年降水量与年径流量也成显著正相关，是年径流量增加（减少）的主要气候因子。
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