scholarly journals Fluctuation of closed lake-level and its climatic significance on the middle Kunlun Mountains

1992 ◽  
Vol 4 (1) ◽  
pp. 19-30 ◽  
Author(s):  
Li Shuanke ◽  
Keyword(s):  
Lake Level ◽  
Kunlun Mountains ◽  
Closed Lake

Mid-Holocene palaeohydrochemistry and palaeohydrology of Yamdrok Yumtso, southern Tibetan Plateau, reconstructed from δ18O and δ13C of fossil shells of the gastropod Radix auricularia

The Holocene ◽  
2020 ◽  
Vol 30 (12) ◽  
pp. 1741-1751 ◽  
Author(s):  
Feng Chen ◽  
Jin-Liang Feng ◽  
Hai-Ping Hu ◽  
Ping Wang
Keyword(s):  
Tibetan Plateau ◽  
Lake Level ◽  
Sedimentary Environment ◽  
Lacustrine Sediments ◽  
High Lake Level ◽  
Isotope Study ◽  
Southern Tibetan Plateau ◽  
Stable Isotope Study ◽  
Radix Auricularia ◽  
Closed Lake

Palaeohydrochemical and palaeohydrological changes of lakes have seldom been reconstructed from the fossil shells of the gasropod Radix auricularia, which is a new, and potentially high-resolution environnmental archive. We conducted a geochemical and stable isotope study of the shells of Radix from the exposed fluvio-lacustrine sediments near Lake Yamdrok Yumtso in the southern Tibetan Plateau. Our aims were to determine the sedimentary environment, palaeo-lake hydrochemistry and hydrological status. AMS 14C and OSL dating indicates that a lake-level stage of Yamdrok Yumtso higher than that of today occurred during ~4.7–1.2 cal. kyr BP. Results of Sr/Ca, δ13C and δ18O analysis of the fossil shells of Radix auricularia indicate that the lake-level fluctuations were mainly controlled by changes of the Indian Summer Monsoon; decreasing evaporation during the mid- to late-Holocene was also responsible. In addition, based on the geochemical relationship between Radix sp. shells and the ambient water in lakes, the values of δ18OPalaeo-water and Sr/CaPalaeo-water reconstructed using the fossil shells of Radix auricularia are −8.2‰ to −5.1‰ and 0.0012 to 0.0057, respectively. Further, based on the values of δ18Oshell, together with geomorphological evidence, we infer that Yamdrok Yumtso was a closed lake system, and we estimate its possible extent during the interval of high lake-level. In addition, we speculate that the water level of Yamdrok Yumtso at this time exceeded 4448.9 m a.s.l., but was less than 4451 m a.s.l., and that the major separation of various components of the Yamdrok Yumtso system occurred after 1.2 kyr BP.

Survey on Bird Species and Analysis on Bird Diversity in the Central Kunlun Mountains in the Early Winter

2010 ◽  
Vol 27 (2) ◽  
pp. 230-235
Author(s):  
Ming MA ◽  
Bao-wen HU ◽  
Yu MEI ◽  
Thomas McCarthy
Keyword(s):  
Bird Species ◽  
Bird Diversity ◽  
Early Winter ◽  
Kunlun Mountains

SOURCES OF CARBONATE PRECIPITATION IN MONO LAKE SEDIMENTS: δ18O AND CARBONATE CLUMPED ISOTOPES AS LAKE LEVEL PROXIES

2017 ◽  
Author(s):  
Miquela Ingalls ◽  
◽  
Sophie Westacott ◽  
Makayla Betts ◽  
Jana Meixnerova ◽  
...  
Keyword(s):  
Lake Sediments ◽  
Lake Level ◽  
Mono Lake ◽  
Carbonate Precipitation ◽  
Clumped Isotopes

Rock varnish record of the African Humid Period in the Lake Turkana basin of East Africa

The Holocene ◽  
2021 ◽  
pp. 095968362110116
Author(s):  
Tanzhuo Liu ◽  
Christopher J Lepre ◽  
Sidney R Hemming ◽  
Wallace S Broecker
Keyword(s):  
East Africa ◽  
Lake Level ◽  
Drainage System ◽  
Early Holocene ◽  
Lake Turkana ◽  
Moisture Condition ◽  
Turkana Basin ◽  
Rock Varnish ◽  
Geomorphic Features ◽  
Humid Period

Rock varnish is a manganiferous dark coating accreted on subaerially exposed rocks in drylands. It often contains a layered microstratigraphy that records past wetness variations. Varnish samples from latest Pleistocene and Holocene geomorphic features in the Lake Turkana basin, East Africa display a regionally replicable microstratigraphy record of Holocene millennial-scale wetness variability and a broad interval of wetter conditions during the African Humid Period (AHP). Three major wet pulses in the varnish record occurred during the generally wet interval of the early Holocene (11.5–8.5 ka) when the lake attained its maximum high stand (MHS) at 455–460 m. A >23 m drop from the MHS occurred between 8.5 and 8 ka. Subsequently two additional wet pulses occurred during the early to middle Holocene (8–5 ka) when the lake occupied its secondary high stand at 445 m. Collectively, these five wet phases represent an extended wet interval coincident with the AHP in the region. One moderate wet phase occurred during the subsequent climatic transition from the humid to arid regime (5–4.3 ka) after the lake level dropped rapidly from 445 m to <405 m. Five minor wet phases took place during the overall arid period of the late Holocene (4.3–0 ka) when the lake level oscillated below 405 m. These findings indicate that the AHP terminated rapidly around 5 ka in the Turkana basin in terms of lake level drop, but the regional shift in relative humidity from the AHP mode to its present-day condition lagged for about 700 years until 4.3 ka, hinting at a gradual phasing out in terms of moisture condition. These findings further suggest that Lake Turkana overflowed intermittently into the Nile drainage system through its topographic sill at 455–460 m during the early Holocene and has become a closed-basin lake thereafter for the past 8 ky.

scholarly journals Managing Lake Urmia, Iran for diverse restoration objectives: Moving beyond a uniform target lake level

2021 ◽  
Vol 35 ◽  
pp. 100812
Author(s):  
Somayeh Sima ◽  
David E. Rosenberg ◽  
Wayne A. Wurtsbaugh ◽  
Sarah E. Null ◽  
Karin M. Kettenring
Keyword(s):  
Lake Level ◽  
Lake Urmia
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