A5100755070- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Marine and coastal ecosystems
- Methane Hydrates and Related Phenomena
- Geological formations and processes
- Microbial Community Ecology and Physiology
- Marine Biology and Ecology Research
- Geological and Geophysical Studies
- Wastewater Treatment and Nitrogen Removal
- Groundwater and Isotope Geochemistry
- Oceanographic and Atmospheric Processes
- Climate variability and models
- Marine animal studies overview
- Advanced Vision and Imaging
- Tree-ring climate responses
- Climate change and permafrost
- Advanced Image and Video Retrieval Techniques
- Peatlands and Wetlands Ecology
- Coastal wetland ecosystem dynamics
- Pacific and Southeast Asian Studies
- Geochemistry and Elemental Analysis
- Soil Carbon and Nitrogen Dynamics
- Aeolian processes and effects
- Paleontology and Stratigraphy of Fossils
- Pleistocene-Era Hominins and Archaeology
Hainan University
2021-2025
Lanzhou University
2024
Xiamen University
2014-2020
Chung Yuan Christian University
2010
Yan'an University
2009
Abstract Deepwater circulation plays a central role in global climate. Compared with the Atlantic, Pacific deepwater circulation's history remains unclear. The Luzon overflow, branch of North deep water, determines ventilation rate South China Sea (SCS) basin. Sedimentary magnetic properties SCS reflect millennial‐scale fluctuations current intensity and orientation. data suggest slightly stronger at Last Glacial Maximum compared to Holocene. But, most striking increase occurred during...
Abstract In the context of continuously increasing anthropogenic nitrogen inputs, knowledge how ammonia oxidation (AO) in ocean responds to warming is crucial predicting future changes marine biogeochemistry. Here, we show divergent thermal response patterns for AO across a wide onshore/offshore trophic gradient. We find oxidizer community and ambient substrate co-regulate optimum temperatures (T opt ), generating distinct with T varying from ≤14 °C ≥34 °C. Substrate addition elevates when...
High-standing islands, such as Taiwan, offer unique opportunities to study soil organic carbon (SOC) dynamics due their steep terrains, rapid erosion, and strong climatic gradients. In this study, we investigated 54 forest profiles across northern, central, southern Taiwan assess SOC inventories turnover using stable isotope (δ13C) analyses. We applied Rayleigh fractionation modeling vertical δ13C enrichment patterns derived the parameter β, which serves a proxy for rates. Our findings...
Abstract Sediment nitrate respiration eliminates reactive nitrogen (Nr) and consumes organic carbon (OC) accompanying by CO 2 N O production to partially neutralize the climate benefit of sedimentary burial. The quantitative linkage between stoichiometry greenhouse potential this syndepositional process, particularly at a marginal sea scale, remains unexplored. Here we show that temperature matter co‐regulate sediment associated in China's seas. By establishing empirical equations, access...
Abstract. Available reports of dissolved oxygen, δ15N nitrate (δ 15NNO3) and total nitrogen (δ15Nbulk) for trap material surface/downcore sediments from the Arabian Sea (AS) were synthesized to explore AS' past dynamics. Based on 25 μmol kg−1 oxygen isopleth at a depth 150 m, we classified all reported data into northern southern groups. By using δ15Nbulk sediments, obtained geographically distinctive bottom-depth effects AS different climate stages. After eliminating bias caused by bottom...
Abstract Despite being the only link between reduced and oxidized nitrogen, impact of environmental factors on nitrification, temperature particles, in particular, remains unclear for coastal zones. By using 15 NH 4 + ‐labeling technique, we determined nitrification rates bulk (NTR B ) free‐living F , after removing particles >3 μm) water samples with varying particle concentrations (as sampled at different tidal stages) during autumn, winter, summer a eutrophic bay southern China. The...
Research Article| July 01, 2017 Millennial-scale ocean dynamics controlled export productivity in the subtropical North Pacific Dawei Li; Li 1State Key Laboratory of Marine Environmental Science, Xiamen University, No. 422, Siming South Road, 361102, China Search for other works by this author on: GSW Google Scholar Li-Wei Zheng; Zheng Samuel L. Jaccard; Jaccard 2Institute Geological Sciences and Oeschger Center Climate Change Research, University Bern, Baltzerstrasse 3, Bern 3012,...
Abstract. The general features of the N cycle in sunlit region ocean are well known, but methodological difficulties have previously confounded simultaneous quantification transformation rates among many different forms N, e.g., ammonium (NH4+), nitrite (NO2−), nitrate (NO3−), and particulate/dissolved organic nitrogen (PN/DON). However, recent advances analytical methodology made it possible to employ a convenient isotope labeling technique quantify situ fluxes oft-measured species within...
With the advances of image processing and computer vision, techniques being developed are no longer limited in images acquired with single camera (namely plane vision). A stereo vision system two cameras has become research interest many areas because its ability to yield depth information similar human vision. In this study, objective was develop a that can automatically track localize 3D feature motion using left right video sequences. The design included definition, tracking,...
Abstract Total organic carbon to total nitrogen ratios (C/N) and their isotopic compositions (δ 13 C TOC δ 15 N TN ) are oft‐applied proxies discern terrigenous from marine‐sourced organics unravel ancient environmental information. In high depositional Asian marginal seas, the inclusion of N‐bearing minerals in bulk sediment dilutes or masks signals sought after analyses, thus leading incorrect even contradictory interpretations. We used KOH‐KOBr separate operationally defined matter into...
Characterizing the spatiotemporal variability of East Asian summer monsoon (EASM) advances our understanding its rhythm, dynamics, and future impacts. EASM variations during Holocene have been reconstructed from a variety geological archives proxies. However, heterogeneity rainfall remains controversial. Taiwan is geographically suitable for studying history through archives. Herein, we synthesize reported lake peat sedimentary records entire Holocene, in addition to mass-wasting on-land...
Abstract Lacustrine record of marine aerosol input has rarely been documented. Here, we present the sulfur geochemistry during last deglaciation and early Holocene a sediment core retrieved from Dongyuan Lake in southern Taiwan. An unusually high peak accompanying pyrite presence is observed at 10.5 ka BP. Such content lacustrine unusual. The δ 34 S varied +9.5 to + 17.1‰ with two significant positive shifts 9.4 sources potential processes involving isotope variation including bacterial...
Abstract The Southern Ocean is supposed to play a crucial role in influencing atmospheric CO 2 concentrations. However, the dynamic relationships among rate of upwelling, concentration, and Antarctic climate at millennial timescales remain unclear. Here, we present high‐resolution color reflectance component b* natural gamma radiation from southern Scotia Sea sector reconstruct productivity over past 160 ka. We find that these two independent proxies, reflecting signal nutrient supply this...
Abstract Reservoirs are active sites in the terrestrial environment terms of carbon transformation and storage. Continuous reservoir construction reinforces importance such artificial storage; however, knowledge pertaining to sources, cycling, preservation autochthonous/allochthonous particulate organic (POC) reservoirs remains incomplete. We monitored flux isotope composition sinking particles a subtropical deep reservoir, results were compared with isotopic signatures potential POC sources...
Variations in solar insolation caused by changes the Earth’s orbit—specifically its eccentricity, obliquity, and precession—can leave discernible marks on geologic record. Astrochronology leverages these markers to establish a direct connection between chronological measurements different facets of climate change as recorded marine sediments. This approach offers unique window into system construction high-resolution, continuous time scales. Our study involves comprehensive bulk carbonate...