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Local climatically-driven changes of albedo and surface temperatures in the Sonoran Desert
Journal of Arid Environments ( IF 2.7 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.jaridenv.2020.104147
Alexander N. Zolotokrylin , Luis Brito-Castillo , Tatiana B. Titkova

Abstract The authors explore a new approach to monitoring patches of ground with accentuated desert conditions, here called “parcels of desertification”, resulting from the relation between albedo and surface temperature values. The territory of the El Pinacate y Gran Desierto de Altar Biosphere Reserve in northwestern Sonora, Mexico serves as the example to substantiate the procedure. The region is a UNESCO World Heritage Site, a feature that guarantees minimum anthropogenic impact in the reserve. The results indicate that the approach was successful in identifying only one parcel of desertification in the study area. The parcel appears annually, though it varies in extent and intensity, when NDVI falls below the values 0.09–0.10 in the spring dry periods (April–June) of 2000–2017. This occurs when the radiation mechanism of surface temperature regulation begins to dominate in relation to the evapotranspiration mechanism. Its localization is practically constant year after year, indicating that it is climatically conditioned, i.e., is not caused by anthropogenic pressure. The intensity of desertification in the parcel has a significant upward trend. Two types of a seasonal course of intensity are established, depending on the change of the SOI sign in the spring.

中文翻译:

当地气候驱动的索诺兰沙漠反照率和地表温度变化

摘要 作者探索了一种新方法来监测沙漠条件加剧的地面斑块,这里称为“荒漠化地块”,由反照率和地表温度值之间的关系产生。位于墨西哥索诺拉州西北部的 El Pinacate y Gran Desierto de Altar 生物圈保护区的领土作为证实该程序的例子。该地区是联合国教科文组织世界遗产,这一特点保证了保护区内的人为影响最小。结果表明,该方法仅成功识别了研究区的一个荒漠化地块。当 NDVI 在 2000 年至 2017 年春季干旱期(4 月至 6 月)低于 0.09 至 0.10 值时,该地块每年都会出现,但其范围和强度各不相同。当表面温度调节的辐射机制开始在蒸发蒸腾机制方面占主导地位时,就会发生这种情况。它的定位实际上年复一年地保持不变,表明它受气候条件影响,即不是由人为压力引起的。地块内荒漠化强度呈明显上升趋势。根据春季 SOI 符号的变化,建立了两种类型的季节性强度过程。
更新日期:2020-07-01
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