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  • 1
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    Chironomid (Insecta: Chironomidae) community structure response to hydrological changes in the mid‐1950s in lake Nam Co, Tibetan Plateau (2023)
    Details
    Publication Date: 2024-02-05
    Description: 〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉ABSTRACT〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉The recent rise in air temperatures detected at high altitudes of the Tibetan Plateau has accelerated glacier melt and retreat. Moreover, enhanced monsoonal precipitation has increased runoff and transport of allochthonous material to the lakes. Consequently, water levels are rising, modifying the spatial distribution and composition of local aquatic biota. To infer these environmental and biological changes in recent decades, a 30‐cm‐long sediment core, representing the past ~160 years, from Nam Co, an endorheic lake, was analyzed for subfossil chironomid assemblages and sediment geochemistry. In total, 25 chironomid morphotypes were identified. Nineteen were considered as non‐rare taxa (abundances ≥2%) and six as rare taxa (abundances 〈2%). Since 1956 〈sc〉ce〈/sc〉, higher chironomid richness (〈italic〉S〈/italic〉 = 19) is evident compared to the previous 100 years. The simultaneous decrease in the abundance of profundal 〈italic〉Micropsectra radialis〈/italic〉‐type and increase of both 〈italic〉Chironomus〈/italic〉 and 〈italic〉Procladius〈/italic〉, taxa adapted to more eurytopic and slightly warmer water bodies, indicate increasing water temperatures and intensified primary productivity. The dominance of littoral chironomid assemblages reflects increasing lake water levels, flooded shorelines and expansion of littoral areas driven by increased precipitation and glacial meltwater input both resulting from the increase in air temperatures. This scenario is confirmed by increases in total nitrogen and Zr/Rb ratios, indicating higher productivity and coarser grain size as a consequence of increased runoff via the Niya Qu. These hydrological changes have resulted in a positive water balance that can be linked to an increase in moisture supply from the Indian summer monsoon and glacier melt, reflecting increasing temperatures and precipitation since 1956 〈sc〉ce〈/sc〉, ultimately driven by anthropogenic warming.〈/p〉
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Keywords: ddc:577.6 ; chironomid ; Indian summer monsoon ; Nam Co ; Niya Qu ; nutrients ; runoff ; water level
    Language: English
    Type: doc-type:article
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  • 2
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    Stable isotope and ostracode species assemblage evidence for lake level changes of Nam Co, southern Tibet, during the past 600 years (2010)
    In:  EPIC3Quaternary International, 212(1), pp. 2-13
    Details
    Publication Date: 2019-07-16
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 3
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    Dataset from RNAseq analysis of differential gene expression among developmental stages of two non-marine ostracodes (2024)
    Elsevier
    In:  EPIC3Data in Brief, Elsevier, 53, pp. 110070-110070, ISSN: 2352-3409
    Details
    Publication Date: 2024-04-09
    Description: We contribute transcriptomic data for two species of Ostracoda, an early-diverged group of small-sized pancrustaceans. Data include new reference transcriptomes for two asexual non-marine species (Dolerocypris sinensis and Heterocypris aff. salina), as well as single-specimen transcriptomic data that served to analyse gene expression across four developmental stages in D. sinensis. Data are evaluated by computing gene expression profiles of the different developmental stages which consistently placed eggs and small larvae (at the stage of instar A-8) similar to each other, and apart from adults which were distinct from all other developmental stages but closest to large larvae (instar A-4). We further evaluated the transcriptomic data with two newly sequenced low-coverage genomes of the target species. The new data thus document the feasibility of obtaining reliable transcriptomic data from single specimens – even eggs – of these small metazoans.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 4
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    ChRM inclination and declination vs. age in sediment core TAN10-1 from lake Tangra Yumco, Tibetan Plateau (2015)
    PANGAEA
    Details
    Publication Date: 2023-03-13
    Keywords: AGE; ChRM, Declination; ChRM, Inclination; GC; Gravity corer; TAN10-1; TangraYumco10-1; Tibetan Plateau
    Type: Dataset
    Format: text/tab-separated-values, 298 data points
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  • 5
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    ChRM inclination and declination vs. age in sediment core TOC11-4 from lake Taro Co, Tibetan Plateau (2015)
    PANGAEA
    Details
    Publication Date: 2023-03-13
    Keywords: AGE; ChRM, Declination; ChRM, Inclination; GC; Gravity corer; TaraCo11-4; Tibetan Plateau; TOC11-4
    Type: Dataset
    Format: text/tab-separated-values, 142 data points
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  • 6
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    PSV records from Tangra Yumco and Taro Co (Tibetan Plateau) (2015)
    PANGAEA
    In:  Supplement to: Haberzettl, Torsten; Henkel, Karoline; Kasper, Thomas; Ahlborn, Marieke; Su, Youliang; Wang, Junbo; Appel, Erwin; St-Onge, Guillaume; Stoner, Joseph S; Daut, Gerhard; Zhu, Liping; Mäusbacher, Roland (2015): Independently dated paleomagnetic secular variation records from the Tibetan Plateau. Earth and Planetary Science Letters, 416, 98-108, https://doi.org/10.1016/j.epsl.2015.02.007
    Details
    Publication Date: 2023-03-13
    Description: Magnetostratigraphy has been serving as a valuable tool for dating and confirming chronologies of lacustrine sediments in many parts of the world. Suitable paleomagnetic records on the Tibetan Plateau (TP) and adjacent areas are, however, extremely scarce. Here, we derive paleomagnetic records from independently radiocarbon-dated sediments from two lakes separated by 250 km on the southern central TP, Tangra Yumco and Taro Co. Studied through alternating field demagnetization of u-channel samples, characteristic remanent magnetization (ChRM) directions document similar inclination patterns in multiple sediment cores for the past 4000 years. Comparisons to an existing record from Nam Co, a lake 350 km east of Tangra Yumco, a varve-dated record from the Makran Accretionary Wedge, records from Lakes Issyk-Kul and Baikal, and a stack record from East Asia reveal many similarities in inclination. This regional similarity demonstrates the high potential of inclination to compare records over the Tibetan Plateau and eventually date other Tibetan records stratigraphically. PSV similarities over such a large area (〉3000 km) suggest a large-scale core dynamic origin rather than small scale processes like drift of the non-dipole field often associated with PSV records.
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 7
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    Geochemistry and grain size analysis of the Tangra Yumco lake sediment record
    PANGAEA
    In:  Supplement to: Ahlborn, Marieke; Haberzettl, Torsten; Wang, Junbo; Henkel, Karoline; Kasper, Thomas; Daut, Gerhard; Zhu, Liping; Mäusbacher, Roland (2016): Synchronous pattern of moisture availability on the southern Tibetan Plateau since 17.5 cal. ka BP - the Tangra Yumco lake sediment record. Boreas, https://doi.org/10.1111/bor.12204
    Details
    Publication Date: 2023-05-12
    Description: A possible asynchronicity of the spatial and temporal moisture availability on the Tibetan Plateau was controversially discussed in recent years. Here we present the first attempt to systematically investigate possible spatial and temporal variations of moisture availability by examining two lakes, Tangra Yumco and Nam Co, on an east-west-transect on the southern Tibetan Plateau using identical proxies for palaeoenvironmental reconstruction. In this study, an independent record from Tangra Yumco was analyzed applying a multi-proxy approach to reconstruct variations in moisture availability since the Lateglacial. Results were subsequently compared to previously published records from Nam Co and additional records from Tso Moriri (northwestern Himalaya) and Naleng Co (south-eastern Tibetan Plateau). Our results show that Tangra Yumco was at least partially ice-covered prior to 17.1 cal. ka BP. A temperature rise after 17.1 cal. ka BP probably resulted in thawing of the permafrost. At 16.0 cal. ka BP moisture availability increased representing an initial monsoonal intensification. Warmer conditions between 13.0 and 12.4 cal. ka BP and cooler conditions between 12.4 cal. ka BP and the onset of the Holocene reflect the Bølling-Allerød and Younger Dryas. At the onset of the Holocene moisture availability rapidly increased, while moisture was highest prior to 8.5 cal. ka BP concurrently with highest temperatures. After 8.5 cal. ka BP the moisture availability gradually decreased and showed only minor amplitude variations. These findings are well in phase with the records from other large lakes likes Nam Co, Tso Moriri, and Naleng Co revealing a synchronous pattern of moisture availability on the southern Tibetan Plateau.
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 8
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    Sedimentological, geochemical, micropaleontological and palynological sediment record of TT Lake, southern-central Tibetan Plateau
    PANGAEA
    In:  Supplement to: Ahlborn, Marieke; Haberzettl, Torsten; Wang, Junbo; Alivernini, Mauro; Schlütz, Frank; Schwarz, Anja; Su, Youliang; Frenzel, Peter; Daut, Gerhard; Zhu, Liping; Mäusbacher, Roland (2014): Sediment dynamics and hydrologic events affecting small lacustrine systems on the southern-central Tibetan Plateau - the example of TT Lake. The Holocene, 25(3), 508-522, https://doi.org/10.1177/0959683614561885
    Details
    Publication Date: 2023-05-12
    Description: A sedimentological, geochemical, micropaleontological, and palynological study of a lacustrine sediment record from the small TT Lake (southern-central Tibetan Plateau) shows that the background sedimentation was frequently interrupted by event-related deposits. These event-related deposits are interpreted as the result of hydrologic events that are triggered by above-average precipitation events. In total, 11 events were recorded in the TT Lake sequence. Two types can be differentiated: fluvial runoff events caused by precipitation that carried sediment in suspension into the lake and a sediment mass transport caused by torrential precipitation. The hydrologic events appear to be decoupled from long-term climate and environmental variations, but there is evidence that anthropogenic impact, in terms of pastoralism, might have favored the runoff events. The multi-proxy approach proved to be valuable and allowed for a detailed study of sedimentary processes within the lake and its watershed in order to assess their triggering processes and dynamics. The findings show the complexity of these sedimentary processes and their controlling factors, and the study aims to improve their understanding. This study is the first effort to investigate event-related deposits and sedimentary processes on the Tibetan Plateau and its triggering processes and dynamics by utilizing lacustrine sediment records.
    Type: Dataset
    Format: application/zip, 13 datasets
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  • 9
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    Investigations on sediments from Lake Nam Co (Tibetan Plateau)
    PANGAEA
    In:  Supplement to: Kasper, Thomas; Frenzel, Peter; Haberzettl, Torsten; Schwarz, Anja; Daut, Gerhard; Meschner, Stephanie; Wang, Junbo; Zhu, Liping; Mäusbacher, Roland (2013): Interplay between redox conditions and hydrological changes in sediments from Lake Nam Co (Tibetan Plateau) during the past 4000 cal BP inferred from geochemical and micropaleontological analyses. Palaeogeography, Palaeoclimatology, Palaeoecology, 392, 261-271, https://doi.org/10.1016/j.palaeo.2013.09.027
    Details
    Publication Date: 2023-05-12
    Description: This study focuses on the analysis of lake sediments retrieved from the deepest part of Lake Nam Co (Tibetan Plateau). One gravity core of 115 cm length, covering the last ~ 4000 cal BP, was analyzed for geochemical and biological parameters. High organic content at ~ 4000 cal BP and the coinciding presence of pyrite framboids until ~ 2000 cal BP point to hampered decomposition of organic material due to anoxic conditions within the lake sediments. At the same time sedimentological and biological proxies suggest a rather high lake level, but still ~ 5 m below the recent one, with less saline lake water due to enhanced monsoonal activity. During this time a change in the source of organic matter to lowered input of terrestrial components is observed. A rather quick shift to a dry environment with less monsoonal influence and a lake level ~ 15 m lower than today at ~ 2000 cal BP lead to the oxygenation of sediment, the degradation of organic matter and the absence of pyrite. Oscillations of the lake level thereafter were of minor amplitude and not able to establish anoxia at the lake bottom again. A wet spell between ~ 1500 cal BP and ~ 1150 cal BP is visible in proxies referring to catchment hydrology and the ostracod-based water depth transfer function gives only a slightly elevated lake level. The last ~ 300 years are characterized by low TOC and rising TN values reflecting enhanced nutrient supply and hence an advancing influence of human activity in the catchment. Decreasing TOC/TN values point to a complete shift to almost solely aquatic biomass production. These results show that hydrological variations in terms of lake level change based on monsoonal strength can be linked to redox conditions at the lake bottom of Nam Co. Comparison with other archives over larger parts of the Tibetan Plateau and beyond exhibits a rather homogeneous climatic pattern throughout the late Holocene.
    Type: Dataset
    Format: application/zip, 9 datasets
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  • 10
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    Sedimentary n-alkanes, their hydrogen isotopes, GDGTs and d15N as well as δ¹³Corg of lake Nam Co, Tibet (2015)
    PANGAEA
    In:  Supplement to: Günther, Franziska; Witt, Roman; Schouten, Stefan; Mäusbacher, Roland; Daut, Gerhard; Zhu, Liping; Xu, Baiqing; Yao, Tandong; Gleixner, Gerd (2015): Quaternary ecological responses and impacts of the Indian Ocean Summer Monsoon at Nam Co, Southern Tibetan Plateau. Quaternary Science Reviews, 112, 66-77, https://doi.org/10.1016/j.quascirev.2015.01.023
    Details
    Publication Date: 2023-06-27
    Description: The transition from the last Glacial to the current Interglacial, the Holocene, represents an important period with climatic and environmental changes impacting ecosystems. In this study, we examined the interplay between the Indian Ocean Summer Monsoon (IOSM) and the Westerlies at lake Nam Co, southern Tibet to understand the climatic effects on the ecosystem. Different organic geochemical proxies (n-alkanes, glycerol dialkyl glycerol tetraethers, dD, d13Corg, d15N) are applied to reconstruct the environmental and hydrological changes on one of the longest available paleorecords at the Tibetan Plateau. Based on our paleohydrological dD proxies, the aquatic signal lags the terrestrial one due to specific ecological thresholds, which, in addition to climatic changes, can influence aquatic organisms. The aquatic organisms' response strongly depends on temperature and associated lake size, as well as pH and nutrient availability. Because the terrestrial vegetation reacts faster and more sensitively to changes in the monsoonal and climatic system, the dD of n-C29 and the reconstructed inflow water signal represent an appropriate IOSM proxy. In general, the interplay of the different air masses seems to be primarily controlled by solar insolation. In the Holocene, the high insolation generates a large land-ocean pressure gradient associated with strong monsoonal winds and the strongest IOSM. In the last glacial period, however, the weak insolation promoted the Westerlies, thereby increasing their influence at the Tibetan Plateau. Our results help to elucidate the variable IOSM, and they illustrate a remarkable shift in the lake system regarding pH, d13Corg and d15N from the last glacial to the Holocene interglacial period.
    Keywords: Lake Nam Co, Tibetan Plateau; NC_08/01; PC; Piston corer
    Type: Dataset
    Format: application/zip, 4 datasets
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