Growing season carries stronger contributions to albedo dynamics on the Tibetan plateau.
Growing season carries stronger contributions to albedo dynamics on the Tibetan plateau.
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生长季节对青藏高原反照率动态的贡献更大
DOI：
10.1371/journal.pone.0180559
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发表时间：
2017
期刊：
影响因子：
3.7
通讯作者：
Zhang Y
中科院分区：
文献类型：
--
作者：
Tian L;Chen J;Zhang Y
近几十年来，青藏高原经历了高于全球平均水平的气候变暖，导致生态系统结构和功能发生了许多重大变化。其中之一是反照率，它连接了地表过程和气候的因果关系。高原在非生长季（nGS）和生长季（GS）分别被雪/冰和植被覆盖。基于MODIS产品，我们研究了2000年至2013年青藏高原冰雪覆盖和植被绿度与反照率时空变化的关系。发现GSNDVI和GSalbedo随时间和青藏地貌变化之间存在同步关系。我们发现年平均反照率呈下降趋势，但nGS期间反照率略有增加，GS期间反照率略有下降。在整个景观中，nGSalbedo 与雪/冰覆盖同步波动。从时间上看，除四月和十月外，月雪/冰覆盖率也与反照率具有很高的对应性。我们检测到反照率对海拔的明显依赖性。随着海拔的升高，nGSalbedo 在 4000 m 以下下降，但在海拔 4500-5500 m 时增加。 5500 m以上，nGSalbedo减小，这与高原冰雪覆盖量减少和土壤湿度增加有关。更重要的是，近十年来反照率的下降似乎主要是由于生长季反照率降低造成的。
The Tibetan Plateau has experienced higher-than-global-average climate warming in recent decades, resulting in many significant changes in ecosystem structure and function. Among them is albedo, which bridges the causes and consequences of land surface processes and climate. The plateau is covered by snow/ice and vegetation in the non-growing season (nGS) and growing season (GS), respectively. Based on the MODIS products, we investigated snow/ice cover and vegetation greenness in relation to the spatiotemporal changes of albedo on the Tibetan Plateau from 2000 through 2013. A synchronous relationship was found between the change in GSNDVI and GSalbedo over time and across the Tibetan landscapes. We found that the annual average albedo had a decreasing trend, but that the albedo had slightly increased during the nGS and decreased during the GS. Across the landscapes, the nGSalbedo fluctuated in a synchronous pattern with snow/ice cover. Temporally, monthly snow/ice coverage also had a high correspondence with albedo, except in April and October. We detected clear dependencies of albedo on elevation. With the rise in altitude, the nGSalbedo decreased below 4000 m, but increased for elevations of 4500–5500 m. Above 5500 m, the nGSalbedo decreased, which was in accordance with the decreased amount of snow/ice coverage and the increased soil moisture on the plateau. More importantly, the decreasing albedo in the most recent decade appeared to be caused primarily by lowered growing season albedo.
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影响因子：
6.7
作者：
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