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| 1 | Eddy covariance measurements of water vapor and energy flux over a lake in the Badain Jaran Desert,China显示文摘Exploring the surface energy exchange between atmosphere and water bodies is essential to gain a quantitative understanding of regional climate change, especially for the lakes in the desert. In this study, measurements of energy flux and water vapor were performed over a lake in the Badain Jaran Desert, China from March 2012 to March 2013. The studied lake had about a 2-month frozen period(December and January) and a 10-month open-water period(February–November). Latent heat flux(LE) and sensible heat flux(Hs) acquired using the eddy covariance technique were argued by measurements of longwave and shortwave radiation. Both fluxes of longwave and shortwave radiation showed seasonal dynamics and daily fluctuations during the study period. The reflected solar radiation was much higher in winter than in other seasons. LE exhibited diurnal and seasonal variations. On a daily scale, LE was low in the morning and peaked in the afternoon. From spring(April) to winter(January), the diurnal amplitude of LE decreased slowly. LE was the dominant heat flux throughout the year and consumed most of the energy from the lake. Generally speaking, LE was mostly affected by changes in the ambient wind speed, while Hs was primarily affected by the product of water-air temperature difference and wind speed. The diurnal LE and Hs were negatively correlated in the open-water period. The variations in Hs and LE over the lake were differed from those on the nearby land surface. The mean evaporation rate on the lake was about 4.0 mm/d over the entire year, and the cumulative annual evaporation rate was 1445 mm/a. The cumulative annual evaporation was 10 times larger than the cumulative annual precipitation. Furthermore, the average evaporation rates over the frozen period and open-water period were approximately 0.6 and 5.0 mm/d, respectively. These results can be used to analyze the water balance and quantify the source of lake water in the Badain Jaran Desert. | SUN Jie HU Wenfeng WANG Nai'ang ZHAO Liqiang AN Ran NING Kai ZHANG Xunhe | 2018 | Journal of Arid Land2018，10，4： | 3 |
| 2 | 巴丹吉林沙漠湖泊颜色季节性变化成因显示文摘粉色盐湖往往被称为玫瑰湖,关于其颜色随时间变化原因研究较少。本研究通过野外考察观测与室内X射线衍射、高通量测序等方法,对巴丹吉林沙漠玫瑰湖达格图湖泊颜色随季节变化成因进行分析。结果表明:达格图属于高盐高碱的氯化物型盐湖。夏季水温高、水中营养物质丰富,造成嗜盐嗜碱有色微生物大量繁殖,使湖水呈现亮粉色;秋季随着水温降低、水量减少,有色微生物减少或消失,湖水变为无色透明。此时混杂赤铁矿的氯化钠结晶大量析出,在湖底形成粉色盐层,使整个湖泊呈现淡粉色。不同季节微生物数量变化造成水中溶解氧不同,赤铁矿因此发生氧化还原反应,造成不同季节结晶盐中赤铁矿含量随之改变。 | 张欣 董治宝 南维鸽 陈国祥 石唯康 王晓枝 高冲 | 2023 | 中国沙漠2023，43，6： | 0 |
| 3 | 塔中地面加热场强度变化特征分析显示文摘利用塔克拉玛干沙漠大气环境综合观测试验站塔中西站10 m梯度自动气象站2009年1、4、7、10月观测数据,基于土壤的一维热扩散方程计算四季自然沙地下垫面的地表土壤热通量和地面加热场强度,从而分析沙漠下垫面的地面加热场强度变化特征。结果表明:(1)春季和夏季地表土壤热通量日总量为正值,热通量方向向下,沙层相对大气是热汇,秋季和冬季则相反;日较差最大值出现在秋季,最小值出现在冬季;除冬季以外土壤热通量只占净辐射通量的很小一部分;(2)1、4、7、10月地面加热场强度分别为-33.20~87.39 W/m^2、-36.92~274.16 W/m^2、-7.59~244.78W/m^2、-24.90~170.42 W/m^2,地面加热场强度日平均值均为正值,地面为热源,夏季最强,春季次之,冬季最弱;(3)与大气相较,白天地面为强热源,夜间为弱冷源,春季地面加热场强度峰值出现在12时(地方时),夏季、秋季、冬季均出现在13时(地方时)。因此,塔克拉玛干沙漠腹地地面加热场强度具有独特的日变化和季节变化特征。 | 王娟 霍文 何清 | 2020 | 沙漠与绿洲气象2020，14，4： | 0 |
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