32 Result(s)
within
Jianfang Chen
Earth Sciences
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Article
Biogeochemistry of sedimentary organic matter in the Yongjiang River estuary in the southern part of Hangzhou Bay, China, since the Late Pleistocene
A sediment core (YJK19-02) collected from the southern outlet of Hangzhou Bay near the Yongjiang River estuary in East China was analyzed for grain size, lignin, bulk elemental composition, stable carbon isoto...
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Article
Potassium isotopic signatures of modern offshore detrital sediments from different climatic regimes and the implications
Potassium isotopes are a novel tracer for continental weathering. Previous K isotope studies on chemical weathering generally targeted weathering profiles under a particular climate region, yet the effects of ...
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Article
Sources and degradation of organic matter in the surface sediments of the Chukchi Sea: insights from amino acids
In the context of global warming and rapid environment change in the Arctic, the supply of organic matter (OM) has increased significantly and a large amount of OM are buried on the Arctic shelf. Studying the ...
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Article
Application of an optical nitrate profiler to high- and low-turbidity coastal shelf waters
Here, we report the results of high-resolution nitrate measurements using an optical nitrate profiler (in situ ultraviolet spectrophotometer, ISUS) along transect across a high-turbidity shelf (East China Sea) an...
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Article
Overlooked contribution of the biological pump to the Pacific Arctic nitrogen deficit
The nutrient-rich Pacific Ocean seawater that flows through the Bering Strait into the Chukchi Sea is generally considered to be the most important source of nutrients to the Arctic euphotic zone. The inflow i...
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Article
Vertical distribution of nutrient tracers in the western Arctic Ocean and its relationship to water structure and biogeochemical processes
During the 3rd Chinese National Arctic Research Expedition cruise in the summer of 2008, nutrients (NO3, NO2, SiO32 , and PO43 ) and dissolved oxygen were measured in the western Arctic Ocean, to derive the verti...
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Article
Comparison of sedimentary organic carbon loading in the Yap Trench and other marine environments
Knowledge about organic carbon loadings (ratio of sedimentary organic carbon (SOC) content to specific surface area (SSA)) and the fate of organic carbon (OC) is critical to understand the marine carbon cycle....
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Changing Nutrients, Oxygen and Phytoplankton in the East China Sea
Biogeochemical processes in the East China Sea are substantially affected by anthropogenic nutrient inputs. The dramatic decadal changes in nutrient concentrations were mainly due to the increases of DIN and D...
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Article
Distribution and Sources of Organic Matter in Surface Sediments of the Northern Bering and Chukchi Seas by Using Bulk and Tetraether Proxies
The organic matter (OM) preserved in Arctic Ocean sediments is of great importance to the global carbon budget. However, works that apply multiple proxies to determine the distribution and concentration of org...
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Article
International Silica Cycle Workshop held in Hangzhou
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Article
Bio-Organic Geochemistry research in China: Advances, opportunities and challenges
The discipline of “Bio-Organic Geochemistry” is a cross research field between biogeochemistry and traditional organic geochemistry, which focuses on geochemical processes related to the biosynthesis of organi...
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Article
Sources and transformations of nitrogen in the South China Sea: insights from nitrogen isotopes
To elucidate the sources and transformations of nitrogen in the South China Sea (SCS), the nitrogen isotopic composition of nitrate ( $...
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Article
Variations in organic carbon loading of surface sediments from the shelf to the slope of the Chukchi Sea, Arctic Ocean
The content of organic carbon (OC) normalized to the specific surface area (SSA) of sediment is widely used to trace variations in OC loading (OC/SSA). This study presents observations of OC/SSA of surface sed...
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Article
Response of phytoplankton community to different water types in the western Arctic Ocean surface water based on pigment analysis in summer 2008
Nutrients and photosynthesis pigments were investigated in the western Arctic Ocean during the 3rd Chinese Arctic Research Expedition Cruise in summer 2008. The study area was divided into five provinces using...
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Article
Composition of algal pigments in surface freshen layer after ice melt in the central Arctic
Seasonal meltwater input creates a thin freshen layer in surface seawater under ice, which largely shifts the algae assemblages. Our recent observation of photosynthetic pigments in the high Arctic showed that...
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Article
Mechanisms of carbon storage and the coupled carbon, nitrogen and sulfur cycles in regional seas in response to global change
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Article
Chinese seventh Arctic scientific expedition
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Article
Mechanisms leading to the frequent occurrences of hypoxia and a preliminary analysis of the associated acidification off the Changjiang estuary in summer
Based on literature data and shipboard observations, this study investigated the main environmental characteristics of the seafloor topography, current field, front, and upwelling that are closely related to h...
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Article
Recognition on the forming-vanishing process and underlying mechanisms of the hypoxia off the Yangtze River estuary
On the basis of compiled multidisciplinary historical data in 2006–2007 and incorporation of relevant simulation results and remote sensing data, we performed an in-depth study of the generation and dissipatio...
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Article
Ice rafting history and paleoceanographic reconstructions of Core 08P23 from southern Chukchi Plateau, western Arctic Ocean since Marine Isotope Stage 3
Multiproxy investigations have been performed on Core 08P23 collected from the Chukchi Plateau, the western Arctic Ocean, during the Third Chinese National Arctic Expedition. The core was dated back to Marine ...
