Contrasting hydrological and thermal intensities determine seasonal lake-level variations – a case study at Paiku Co on the southern Tibetan Plateau
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Published:2021-06-10
Issue:6
Volume:25
Page:3163-3177
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ISSN:1607-7938
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Container-title:Hydrology and Earth System Sciences
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language:en
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Short-container-title:Hydrol. Earth Syst. Sci.
Author:
Lei YanbinORCID, Yao Tandong, Yang Kun, Ma Yaoming, Bird Broxton W.,
Abstract
Abstract. Evaporation from hydrologically closed lakes is one of the largest components
of the lake water budget; however, its effects on seasonal lake-level variations
remain unclear on the Tibetan Plateau (TP) due to a lack of comprehensive
observations. In this study, weekly lake evaporation and its effects on
seasonal lake-level variations are investigated at Paiku Co on the southern TP
using in situ observations of thermal structure and hydrometeorology
(2015–2018). Lake evaporation from Paiku Co was estimated to be 975±142 mm during the ice-free period (May to December), characterized by
low values of 1.7 ± 0.6 mm d−1 during the pre-monsoon season (May to June), high values of
5.5±0.6 mm d−1 during the post-monsoon season (October to
December), and intermediate values of 4.0±0.6 mm d−1 during
the monsoon season (July to September). There was a ∼ 5-month lag between
the maximum net radiation (June) and maximum lake evaporation
(November). These results indicate that the seasonal pattern of lake
evaporation from Paiku Co was significantly affected by the large lake heat
storage. Contrasting hydrological and thermal intensities may play an
important role in the large amplitude of seasonal lake-level variations at
deep lakes like Paiku Co. High inflow from monsoon precipitation and glacier
melting and moderate lake evaporation, for instance, drove rapid lake-level
increase during the monsoon season. In contrast, high lake evaporation and
reduced inflow caused lake level to decrease significantly during the
post-monsoon season. This study implies that lake evaporation may play an
important role in the different amplitudes of seasonal lake-level variations
on the TP.
Publisher
Copernicus GmbH
Subject
General Earth and Planetary Sciences,General Engineering,General Environmental Science
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