Salinity control on long-chain alkenone distributions in lake surface waters and sediments of the northern Qinghai-Tibetan Plateau, China

Abstract The paper presents analysis results concerning changes in the range of areas of surface and transitional retention, here corresponding with wetlands, in two small lake catchments in the western part of West Polesie. The cartometric research was performed on maps covering the period from the 19th to the early 21st century. The analyses were referred to the modern state of investigation recorded on orthophotomaps in data bases disclosed in Geoportal Krajowy and in the Google Earth Pro application. Lake surface retention showed no substantial changes, and the differences result from the scale of maps used in the study, and therefore from the degree of detail of the presented objects. In the catchment of Lake Czarne Gościnieckie it occupied from 13.61 to 15.64% of its area, and in the catchment of Lake Brzeziczno from 0.96 to 1.28%. The greatest discrepancies in the area of wetlands result from the cartographic method of presentation, and generalisation of maps. In the catchment of Lake Czarne Gościnieckie, areas of transitional retention could be identified on 11 out of 13 maps, and in the catchment of Lake Brzeziczno on 12. In the case of the former catchment, transitional retention occupies from 17.35 to 34.00% of its area, and in the catchment of Brzeziczno from 4.81 to 24.00%. Such different surface areas of wetlands measured on maps, however, do not signify evident tendencies for change. Over the last 200 years, no substantial changes occurred in the studied catchments regarding the range of surface waters and wetlands, as confirmed by field research conducted in the years 2006-2012. The quantity and quality of maps and the variability of their scales encourage a careful interpretation of obtained information. In such a case, it is necessary to supplement cartographic analyses with investigating procedures of map preparation, and also to collect written documents concerning the entire area.

Download Full-text

Paleoaltitudinal histories for the northern and southern margins of the Tibetan Plateau during the Late Cenozoic: revealed by GDGTs

10.5194/egusphere-egu21-14073 ◽

2021 ◽

Author(s):

Chihao Chen ◽

Yan Bai ◽

Xiaomin Fang ◽

Haichao Guo ◽

Weilin Zhang ◽

...

Keyword(s):

Tibetan Plateau ◽

Late Miocene ◽

Global Climate ◽

The Tibetan Plateau ◽

Lake Surface ◽

Terrestrial Organic Matter ◽

Plant Fossils ◽

History Of ◽

Monsoon System ◽

Uplift History

As an important driver of global climate change during the Cenozoic, the uplift of the Tibetan Plateau (TP) has strongly influenced the origination and evolution of the Asian monsoon system, and therefore the aridification of central Asia. Over the last two decades, the application of stable isotope paleoaltimeters and the discoveries of mammal and plant fossils have greatly promoted the understanding of the uplift history of the TP. However, paleoaltitudinal reconstructions based on different paleoaltimeters have suggested differing outcomes and therefore remain controversial. Novel paleoaltimeters have therefore needed to be developed and applied to constrain the uplift history of the TP more accurately and effectively by comparing and verifying multi-proxies. Paleothermometers based on glyceryl dialkyl glycerol tetraethers (GDGTs) are widely used in terrestrial and ocean temperature reconstructions. In this study, GDGT-based paleothermometers were tentatively applied to the Gyirong Basin on the southern TP, and the Xining Basins on the northern TP, in an attempt to quantitatively reconstruct their paleoaltitudes.Both soil and aquatic-typed branched GDGTs have been identified from Late Miocene to Mid-Pliocene (7.0-3.2 Ma) samples taken from the Gyirong Basin; their reconstructed paleotemperatures were 7.5&#177;3.3&#176;C and 14.2&#177;4.5&#176;C, respectively. The former temperature may represent the mean temperature of the terrestrial organic matter input area, while the latter may represent the lake surface temperature. The results would suggest that the lake surface of the Gyirong Basin during the Late Miocene to Mid-Pliocene was 2.5&#177;0.8 km and that the surrounding mountains exceeded 3.6&#177;0.6 km, implying that the central Himalayas underwent a rapid uplift of ~1.5 km after the Mid-Pliocene.GDGT-based paleotemperature reconstructions using MBT'5ME values show that the Xining Basin dropped in temperature by ~10&#176;C during the ~10.5-8 Ma period, exceeding that in sea surface temperatures and low-altitude terrestrial temperatures during these periods. By combining these results with contemporaneous tectonic and sedimentary records, we infer that these cooling events signaled the regional uplift with the amplitude of ~1 km of the Xining basins. Our results support that the TP was still growing and uplifting substantially since the Late Miocene, which may provide new evidence for understanding the growth, expansion and uplift patterns of the TP.

Download Full-text

A comprehensive data set of lake surface water temperature over the Tibetan Plateau derived from MODIS LST products 2001–2015

Scientific Data ◽

10.1038/sdata.2017.95 ◽

2017 ◽

Vol 4 (1) ◽

Cited By ~ 26

Author(s):

Wei Wan ◽

Huan Li ◽

Hongjie Xie ◽

Yang Hong ◽

Di Long ◽

...

Keyword(s):

Surface Water ◽

Tibetan Plateau ◽

Water Temperature ◽

The Tibetan Plateau ◽

Surface Water Temperature ◽

Lake Surface ◽

Data Set ◽

Comprehensive Data

Download Full-text

Influence of Upwellings, Storms, and Generating Station Operation on Water Chemistry and Plankton in the Nanticoke Region of Long Point Bay, Lake Erie

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f90-162 ◽

1990 ◽

Vol 47 (7) ◽

pp. 1434-1445 ◽

Cited By ~ 7

Author(s):

T. G. Dunstall ◽

J. C. H. Carter ◽

B. P. Monroe ◽

G. T. Haymes ◽

R. R. Weiler ◽

...

Keyword(s):

Water Chemistry ◽

Surface Waters ◽

Lake Erie ◽

Organic Nitrogen ◽

Inorganic Nitrogen ◽

Lake Surface ◽

Cooling Process ◽

Short Term ◽

Total Inorganic Nitrogen ◽

Reactive Phosphorus

Storms and upwellings resulted in significant alterations to the aquatic environment in the Long Point Bay region of Lake Erie, contributing to short-term variability in water chemistry and plankton. Both storms and upwellings resulted in nutrient enrichment (filtered reactive phosphorus, total inorganic nitrogen, reactive silicates and organic nitrogen) in lake surface waters during the period of lake warming, prior to mid-August. Storms and upwellings also differentially affected the distributions of specific zooplankton taxa in the lake surface stratum. The most prominent effect was the increased abundance of Diacyclops bicuspidatus thomasi during upwellings, particularly towards shore. The once-through cooling process of the generating station also affected zooplankton distributions, most notably that of D. bicuspidatus thomasi, with a nearshore increase in abundance that was similar to the influence exerted by upwelling.

Download Full-text

Calibration of the U 37 K′ index of long-chain alkenones with the in-situ water temperature in Lake Qinghai in the Tibetan Plateau

Chinese Science Bulletin ◽

10.1007/s11434-012-5527-y ◽

2012 ◽

Vol 58 (7) ◽

pp. 803-808 ◽

Cited By ~ 10

Author(s):

Zheng Wang ◽

WeiGuo Liu

Keyword(s):

Tibetan Plateau ◽

Water Temperature ◽

The Tibetan Plateau ◽

Lake Qinghai ◽

K Index ◽

Long Chain

Download Full-text

Microplastics Footprints in a High-Altitude Basin of the Tibetan Plateau, China

Water ◽

10.3390/w13202805 ◽

2021 ◽

Vol 13 (20) ◽

pp. 2805

Author(s):

Sansan Feng ◽

Hongwei Lu ◽

Tianci Yao

Keyword(s):

Tibetan Plateau ◽

Surface Waters ◽

Human Activities ◽

The Tibetan Plateau ◽

Brahmaputra River ◽

Plateau Region ◽

Remote Areas ◽

Water And Sediment ◽

Lhasa River ◽

And Behavior

Microplastics (MPs) are ubiquitous in the environment and have been drawing increasing attention; however, MPs’ occurrence and behavior in remote areas are not well understood. In this study, we quantified and characterized MPs from surface waters and sediments in a remote area, namely the Tibetan Plateau, China. The samples were collected from the Lhasa River and the lower reaches of the Brahmaputra River to better understand MPs’ sources to rivers of the Tibetan Plateau. MPs’ concentrations in water and sediment were 735 items/m3 and 51 items/kg, respectively, and the dominating MPs observed were fibers with size ranging from 100 to 500 µm. MP abundance increased nearly two-fold from upstream to downstream in the Brahmaputra River, associated with the inputs from downstream human activities and the inflows of tributaries (especially the Lhasa River). This study provides important bases for analyzing MPs migration processes in the plateau region.

Download Full-text

Study on the stable isotopes in surface waters of the Naqu River basin, Tibetan Plateau

ScienceAsia ◽

10.2306/scienceasia1513-1874.2018.44.402 ◽

2018 ◽

Vol 44 (6) ◽

pp. 402 ◽

Cited By ~ 2

Author(s):

Guoqiang Dong ◽

Baisha Weng ◽

Tianling Qin ◽

Denghua Yan ◽

Hao Wang ◽

...

Keyword(s):

Stable Isotopes ◽

Tibetan Plateau ◽

River Basin ◽

Surface Waters

Download Full-text

Tracking the impacts of the Aru glacier collapses on downstream lakes

10.5194/tc-2020-117 ◽

2020 ◽

Author(s):

Yanbin Lei ◽

Tandong Yao ◽

Lide Tian ◽

Yongwei Sheng ◽

Jingjuan Liao ◽

...

Keyword(s):

Tibetan Plateau ◽

Lake Level ◽

In Situ Observation ◽

Lake Surface ◽

Level Increase ◽

Lake Morphology ◽

Western Tibetan Plateau ◽

Ice Avalanche

Abstract. Two giant glaciers at the Aru range, western Tibetan Plateau, collapsed suddenly on 17 July and 21 September 2016, respectively, causing fatal damage to local people and their livestock. The ice avalanches, with a total volume of 150 × 106 m3, had almost melted by September 2019. Based on in-situ observation, bathymetry survey and satellite data, here we show the impacts of the two glacier collapses on the downstream lakes, the outflow Aru Co and the terminal Memar Co, in terms of lake morphology, water level and water temperature in the subsequent four years (2016–2019). After the first glacier collapse, the ice avalanche slid into Aru Co along with a large amount of debris, which significantly modified the lake’s shoreline and bathymetry. Lake surface temperature (LST) at Aru Co and Memar Co exhibited a significant decrease of 2–4 oC in the first 1–2 weeks after the first glacier collapse due to the intruding ice into Aru Co and its melting. Memar Co significantly deepened by 12.5 m between 2000 and 2018, with accelerated lake level increase after the glacier collapses. Memar Co expanded rapidly at a rate of 0.80 m/yr between 2016 and 2019, which is about 30 % higher than the average rising rate between 2003 and 2014. The meltwater from ice avalanches was found to contribute to about 26.4 % of the increase in lake storage between 2016 and 2019. This study implies that the Aru glacier collapses had long-term and dramatic impacts on the downstream lakes.

Download Full-text