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Can δ18O help indicate the causes of recent lake area expansion on the western Tibetan Plateau? A case study from Aweng Co
Journal of Paleolimnology ( IF 2.1 ) Pub Date : 2020-10-23 , DOI: 10.1007/s10933-020-00158-6
Yuzhi Zhang , Matthew Jones , Jiawu Zhang , Suzanne McGowan , Sarah Metcalfe

Glacier-fed lakes on the Tibetan Plateau (TP) have undergone rapid expansions since the late 1990s, concurrent with the changing climate. However, the dominant cause(s) of lake area increases is still debated. To identify the drivers of lake expansion, we studied Aweng Co, a glacier-fed lake in the western TP, where surface area has increased (0.74 km 2 year −1 ) since the late 1970s and most rapidly (0.998 km 2 year −1 ) since the late 1990s. A water balance model was used to clarify the reasons for increased lake water volume, supported by stable isotope hydrology and the δ 18 O change recorded in recent sediments. Results showed that glacial meltwater probably had the biggest impact on changes in Aweng Co lake level in recent decades, but that precipitation was also an important contributor. Our study shows that δ 18 O of carbonate (δ 18 O carb ) has great potential for indicating source changes of water supply in such lakes, but there is a need to be cautious when interpreting δ 18 O carb due to the influence of multiple hydrological factors, which can change in dominance over time.

中文翻译:

δ18O 能否帮助说明青藏高原西部近期湖泊面积扩大的原因?Aweng Co 的案例研究

自 1990 年代后期以来,随着气候的变化,青藏高原 (TP) 上的冰川湖泊经历了快速扩张。然而,湖泊面积增加的主要原因仍存在争议。为了确定湖泊扩张的驱动因素,我们研究了青藏高原西部的冰川湖 Aweng Co,自 1970 年代后期以来,该湖的表面积增加了(0.74 公里 2 年 -1 ),并且增长最快(0.998 公里 2 年 -1 ) 自 1990 年代后期以来。在稳定同位素水文学和近期沉积物中记录的 δ 18 O 变化的支持下,使用水平衡模型来阐明湖水量增加的原因。结果表明,近几十年来,冰川融水可能对 Aweng Co 湖水位变化的影响最大,但降水也是一个重要因素。
更新日期:2020-10-23
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