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Relationship between sea surface salinity and ocean circulation and climate change

Science China Earth Sciences 2019年第5期62卷 771-782页

作者： yan du Yuhong ZHANG Jiancheng SHI State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory of Remote Sensing Science Institute of Remote Sensing and Digital Earth Chinese Academy of Sciences

Based on Argo sea surface salinity(SSS) and the related precipitation(P), evaporation(E), and sea surface height data sets, the climatological annual mean and low-frequency variability in SSS in the global ocean and their relationship with ocean circulation and climate change were analyzed. Meanwhile, together with previous studies, a brief retrospect and prospect of seawater salinity were given in this work. Freshwater flux(E-P) dominated the mean pattern of SSS, while the dynamics of ocean circulation modulated the spatial structure and low-frequency variability in SSS in most regions. Under global warming, the trend in SSS indicated the intensification of the global hydrological cycle, and featured a decreasing trend at low and high latitudes and an increasing trend in subtropical regions. In the most recent two decades, global warming has slowed down, which is called the"global warming hiatus". The trend in SSS during this phase, which was different to that under global warming, mainly indicated the response of the ocean surface to the decadal and multi-decadal variability in the climate system, referring to the intensification of the Walker Circulation. The significant contrast of SSS trends between the western Pacific and the southeastern Indian Ocean suggested the importance of oceanic dynamics in the cross-basin interaction in recent decades. Ocean Rossby waves and the Indonesian Throughflow contributed to the freshening trend in SSS in the southeastern Indian Ocean, while the increasing trend in the southeastern Pacific and the decreasing trend in the northern Atlantic implied a long-term linear trend under global warming. In the future, higher resolution SSS data observed by satellites, together with Argo observations, will help to extend our knowledge on the dynamics of mesoscale eddies, regional oceanography, and climate change.

关键词： Sea surface salinity Ocean circulation Climate change Multi-scale interaction

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Southern Ocean SST Variability and Its Relationship with ENSO on Inter-Decadal Time Scales

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Journal of Ocean University of China 2013年第2期12卷 287-294页

作者： yan Li du yan ZHANG Lan State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of Sciences

Empirical orthogonal function （EOF） analysis reveals a co-variability of Sea surface temperatures （SSTs） in the Southern Hemisphere （0°-60°S）. In the South Indian and Atlantic Oceans, there is a subtropical dipole pattern slanted in the southwest-northeast direction. In the South Pacific Ocean, a meridional tripole structure emerges, whose middle pole co-varies with the dipoles in the South Indian and Atlantic Oceans and is used in this study to track subtropical Pacific variability. The South Indian and Atlantic Ocean dipoles and the subtropical Pacific variability are phase-locked in austral summer. On the inter-decadal time scales, the dipoles in the South Indian and Atlantic Oceans weaken in amplitude after 1979/1980. No such weakening is found in the subtropical South Pacific Ocean. Interestingly, despite the reduced amplitude, the correlation of the Indian Ocean and Atlantic dipoles with E1 Nino and Southern Oscillation （ENSO） are enhanced after 1979/1980. The same increase in correlation is found for subtropical South Pacific variability after 1979/1980. These inter-decadal modulations imply that the Southern Hemisphere participates in part of the climate shift in the late 1970s. The correlation between Southern Hemisphere SST and ENSO reduces after 2000.

关键词： Southern Ocean SST ENSO subtropical dipole inter-decadal time scales

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Approximating Nash Equilibrium in Day-ahead Electricity Market Bidding with Multi-agent Deep Reinforcement Learning

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Journal of Modern Power Systems and Clean Energy 2021年第3期9卷 534-544页

作者： yan du Fangxing Li Helia Zandi Yaosuo Xue University of Tennessee KnoxvilleUSA Oak Ridge National Laboratory Oak RidgeUSA

In this paper,a day-ahead electricity market bidding problem with multiple strategic generation company(GEN-CO)bidders is *** problem is formulated as a Markov game model,where GENCO bidders interact with each other to develop their optimal day-ahead bidding *** unobservable information in the problem,a model-free and data-driven approach,known as multi-agent deep deterministic policy gradient(MADDPG),is applied for approximating the Nash equilibrium(NE)in the above Markov *** MAD-DPG algorithm has the advantage of generalization due to the automatic feature extraction ability of the deep neural *** algorithm is tested on an IEEE 30-bus system with three competitive GENCO bidders in both an uncongested case and a congested *** with a truthful bidding strategy and state-of-the-art deep reinforcement learning methods including deep Q network and deep deterministic policy gradient(DDPG)demonstrate that the applied MADDPG algorithm can find a superior bidding strategy for all the market participants with increased profit *** addition,the comparison with a conventional-model-based method shows that the MADDPG algorithm has higher computational efficiency,which is feasible for real-world applications.

关键词： Bidding strategy day-ahead electricity market deep reinforcement learning Markov game multi-agent deterministic policy gradient(MADDPG) Nash equilibrium(NE)

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Challenges of incorporating gene expression data to predict HCC prognosis in the age of systems biology

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World Journal of Gastroenterology 2012年第30期18卷 3941-3944页

作者： yan du Guang-Wen Cao Department of Epidemiology Second Military Medical UniversityShanghai 200433China

Hepatocellular carcinoma (HCC) is a leading cause of cancer-related death *** recurrence of HCC after curative treatments is currently a major *** of subsets of patients with distinct prognosis provides an opportunity to tailor therapeutic approaches as well as to select the patients with specific sub-phenotypes for targeted ***,the development of gene expression profiles to improve the prediction of HCC prognosis is important for HCC *** several gene signatures have been evaluated for the prediction of HCC prognosis,there is no consensus on the predictive power of these *** systematic approaches to evaluate these signatures and combine them with clinicopathologic information may provide more accurate prediction of HCC ***,Villanueva et al developed a composite prognostic model incorporating gene expression patterns in both tumor and adjacent tissues to predict HCC *** this commentary,we summarize the current progress in using gene signatures to predict HCC prognosis,and discuss the importance,existing issues and future research directions in this field.

关键词： Gene expression signatures Hepatocellular carcinoma Prognosis

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Scientific questions about South China Sea ocean dynamics

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Acta Oceanologica Sinica 2015年第11期34卷 1-5页

作者： HUANG Rui Xin du yan State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences Woods Hole Oceanographic Institution

South China Sea, its circulation and connection with other parts of the world oceans, poses important scientific questions. From the prospective view, we postulate ten key research directions to be pursued in the coming future, including ventilation of a monsoon dominated sea, water mass formation/transformation, heat/salt and water mass balance, energetics and mixing, mesoscale eddies, the role of typhoon, deep circulation and paleoclimate records, interaction with adjacent oceans, upwelling and ecology system, and response to climate changes.

关键词： South China Sea ocean dynamics circulation gyre interaction ventilation mixing

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The regime shift in the 1960s and associated atmospheric change over the southern Indian Ocean

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Acta Oceanologica Sinica 2017年第1期36卷 1-8页

作者： WANG Tianyu du yan LIAO Xiaomei State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China University of Chinese Academy of Sciences Beijing 100049China

The change of sea surface temperature（SST） in the southern Indian Ocean（SIO） during the recent six decades has been analyzed based on oceanic reanalysis and model, as well as atmospheric data. The results show that a thermal regime shift in SIO during the 1960 s, which is not caught enough attentions, has been of equal magnitude to the linear warming since 1970. Empirical Orthogonal Function（EOF） analyses reveal that a thermal shift is combined with atmospheric changes such as the weakening of westerly during the period of 1960–1967. Inner dynamic connections can be defined that when the westerly winds turn weak, the anticyclonic wind circulation between westerly winds and the trade winds decreases, which further reduces the SST to a negative peak in this period. It is noted that the shifts in the 1960 s are also evident for Southern Hemisphere. For example, subtropical high and the entire westerly winds belt at high latitudes both change dramatically in the 1960 s. This large-scaled process maybe link to the change of southern annular mode（SAM）.

关键词： sea surface temperature regime shift southern Indian Ocean interdecadal variabilities linear trend

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Trehalose phosphate synthase 5-dependent trehalose metabolism modulates basal defense responses in Arabidopsis thaliana

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Journal of Integrative Plant Biology 2019年第4期61卷 509-527页

作者： Xuelan Wang yan du Diqiu Yu Key Laboratory of Tropical Plant Resources and Sustainable Use Xishuangbanna Tropical Botanical Garden Chinese Academy of Sciences University of Chinese Academy of Sciences

Despite the recent discovery that trehalose synthesis is important for plant development and abiotic stress tolerance, the effects of trehalose on biotic stress responses remain relatively unknown. In this study, we demonstrate that TREHALOSE PHOSPHATE SYNTHASE 5(TPS5)-dependent trehalose metabolism regulates Arabidopsis thaliana defenses against pathogens(necrotrophic Botrytis cinerea and biotrophic Pseudomonas syringae).Pathogen infection increased trehalose levels and upregulated TPS5 expression. Application of exogenous trehalose significantly improved plant defenses against B. cinerea, but increased the susceptibility of plants to P. syringae. We demonstrate that elevated trehalose biosynthesis, in transgenic plants over-expressing TPS5, also increased the susceptibility to P. syringae, but decreased the disease elcit r symptoms caused by B. cinerea. The knockout of TPS5 prevented the accumulation of trehalose and enhanced defense responses against P. syringae. Additionally, we observed that a TPS5-interacting protein(multiprotein bridging factor 1c) was required for induced expression of TPS5 during pathogen infections. Furthermore, we show that trehalose promotes P. syringae growth and disease development, via a mechanism involving suppression of the plant defense gene, Pathogenesis-Related Protein 1. These findings provide insight into the function of TPS5-dependent trehalose metabolism in plant basal defense responses.

关键词： Trehalose phosphate synthase Arabidopsis thaliana^FA

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SST effect on the pre-monsoon intraseasonal oscillation over the South China Sea based on atmospheric-coupled GCM comparison

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Journal of Oceanology and Limnology 2023年第2期41卷 409-417页

作者： Yun LIANG yan du Shang-Ping XIE State Key Laboratory of Tropical Oceanography&Key Laboratory of Science and Technology on Operational Oceanography South China Sea Institute of OceanologyChinese Academy of Sciences&Innovation Academy of South China Sea Ecology and Environmental EngineeringGuangzhou 510301China College of Marine Science University of Chinese Academy of SciencesBeijing 100049China Peking University Chongqing Research Institute of Big Data Chongqing 401332China Southern Marine Science and Engineering Guangdong Laboratory Guangzhou 510301China Scripps Institution of Oceanography University of CaliforniaSan DiegoLa JollaCA 92093USA

The role of sea surface temperature(SST)variability in the pre-monsoonal(April to July)intraseasonal oscillation(ISO)over the South China Sea(SCS)is investigated using the Community Earth System Model Version 2(CESM2).An Atmospheric Model Intercomparison Project(AMIP)simulation forced by daily sea surface temperatures(SSTs)derived from a parallel coupled general circulation model(CGCM)run was compared with observations and the mother coupled *** the coupled model,the SST warming leads the peak convection about 1/4 period as in *** paralell uncoupled model fails to simulate this phase relationship,implying the importance of air-sea coupling in reproducing realistic *** to the near-quadrature phase relationship between SST and precipitation ISOs during the ISO events,it is difficult to distinguish the active/passive role of SST from observations *** correlation in intraseasonal precipitation between the daily SST-forced AMIP and mother CGCM runs indicates that SST plays a role in driving the atmospheric ISO.

关键词： intraseasonal variability South China Sea Community Earth System Model Version 2(CESM2) sea surface temperature

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Root carbon consumption and grain yield of spring wheat in response to phosphorus supply under two water regimes

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Journal of Integrative Agriculture 2016年第7期15卷 1595-1601页

作者： GUAN Yu QIAO Zhen du Jiu-yuan du yan-lei Department of Resource and Environmental Science Agronomy College Shihezi University State Key Laboratory of Grassland Agro-ecosystem Institute of Arid Agroecology School of Life Sciences Lanzhou University Institute of Wheat Gansu Academy of Agricultural Sciences

In semiarid areas, cereal crops often alocate more biomass to root at the expense of aboveground yield. A pot experiment was conducted to investigate carbon consumption of roots and its impact on grain yield of spring wheat （Triticum aestivum L.） as affected by water and phosphorus （P） supply. A factorial design was used with six treatments namely two water regimes （at 80–75% and 50–45% ifeld capacity （FC）） and three P supply rates （P1=0, P2=44 and P3=109 μg P g–1 soil）. At shooting and lfowering stages, root respiration and carbon consumption increased with the elevate of P supply rates, regardless of water conditions, which achieved the minimum and maximum at P1 under 50–45% FC and P3 under 80–75% FC, respectively. However, total aboveground biomass and grain yield were higher at P2 under 80–75% FC; and decreased with high P application （P3）. The results indicated that rational or low P supply （80–75% of ifeld water capacity and 44 mg P kg–1 soil） should be recommended to improve grain yield by decreasing root carbon consumption in semiarid areas.

关键词： grain yield phosphorus supply rootcarbon consumption spring wheat water supply

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Facile synthesis of hierarchically porous carbons by controlling the initial oxygen concentration in-situ carbonization of ZIF-8 for efficient water treatment

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Chinese Journal of Chemical Engineering 2018年第12期26卷 2523-2530页

作者： Na Zhou yan du Chunyu Wang Rizhi Chen State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech University Nanjing 210009China College of Environment Nanjing Tech UniversityNanjing 210009China

The state-of-the-art approaches for adjusting the structural characteristics of porous carbons are the aftertreatments, which are complicated and time consuming. In this work, a facile approach was developed, i.e., controlling the initial oxygen concentration in-situ during the direct carbonization of zeolitic imidazole framework-8(ZIF-8), to adjust the pore structure and prepare hierarchically porous carbons. The introduction of oxygen can significantly affect the crystalline and pore structures of porous carbons, and promote the pore widening and the formation of mesopores. An appropriate initial oxygen concentration can notably enhance the surface area and mesopore volume of porous carbon, and then improve the adsorption capacity toward methylene blue(MB) dye from water by 3.4 times. The developed approach is more efficient at lower carbonization ***, the introduction of oxygen can increase the ratio of HO\\C_O groups on the carbon surface, leading to enhanced interaction with MB molecules and higher adsorption capacity toward MB. The as-prepared porous carbons exhibit superior adsorption capacities toward MB dye as compared to the reported ZIF-8 derived carbons. These findings would aid the development of porous carbon materials with high performance.

关键词： Porous carbon ZIF-8 Carbonization Oxygen Adsorption Water treatment

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