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Changes in lake area and water level in response to hydroclimate variations in the source area of the Yellow River:a case study from Lake Ngoring

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Frontiers of Earth Science 2023年第4期17卷 920-932页

作者： Yang PU Min ZHAN Xiaohua SHAO Josef PWERNE philip ameyers Jiaojiao YAO Da ZHI School of Geographical Sciences Nanjing University of Information Science&TechnologyNanjing 210044China Department of Geology and Environmental Science University of PittsburghPittsburgh PA 15260USA Department of Earth and Environmental Sciences The University of MichiganAnn Arbor MI 48109USA

In the north-eastern Qinghai-Tibet Plateau(QTP),the source area of the Yellow River(SAYR)has been experiencing significant changes in climatic and environmental conditions in recent *** date,few studies have combined modern hydrological conditions with paleoclimate records to explore the mechanism(s)of these *** study seeks to improve understanding of hydrological variability on decadal and centennial timescales in the SAYR and to identify its general *** first determined annual fluctuations in the surface area of Lake Ngoring from 1985 to 2020 using multi-temporal Landsat *** results show that lake surface area changes were generally consistent with variations in precipitation,streamflow and the regional dry-wet index in the SAYR,suggesting that the water balance of the Lake Ngoring area is closely associated with regional hydroclimate *** records are also comparable to the stalagmite δ^(18)O monsoon record,as well fluctuations in the Southern Oscillation Index(SOI).Moreover,an association of high TSI(total solar insolation)anomalies and sunspot numbers with the expansion of Lake Ngoring surface area is observed,implying that solar activity is the key driving factor for hydrologic variability in the SAYR on a decadal *** this line of reasoning,we compared the δ^(13)C org-based lake level fluctuations of Lake Ngoring for the last millennium,as previously reported,with the hydroclimatic history and the reconstructed TSI *** conclude that the hydrological regime of Lake Ngoring has been mainly controlled by centennial fluctuations in precipitation for the last millennium,which is also dominated by solar *** general,it appears that solar activity has exerted a dominant influence on the hydrological regime of the SAYR on both decadal and centennial timescales,which is clearly manifested in the variations of lake area and water level of Lake Ngoring.

关键词： Qinghai-Tibet Plateau(QTP) source area of the Yellow River(SAYR) lake area/level Asian summer monsoon(ASM) El Nino-Southern Oscillation(ENSO) total solar insolation(TSI)

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