检索结果-南通市图书馆

Heat center of the western Pacific warm pool

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Oceanology and Limnology 2012年第1期30卷 169-176页

作者： hu shijian hu Dunxin Institute of Oceanology Chinese Academy of SciencesQingdao 266071China Key Laboratory of Ocean Circulation and Wave Chinese Academy of SciencesQingdao 266071China Graduate University of Chinese Academy of Sciences Beijing 100049China

A heat center （HC） of the western Pacific warm pool （WPWP） is defined, its variability is examined, and a possible mechanism is discussed. Analysis and calculation of a temperature dataset from 1945-2006 show that the mean position of the HC during this period was near 0.4°S/169.0°E, at 38.0 m depth. From a time series of the HC, remarkable seasonal variability was found, mainly in the meridional and vertical directions. Interannual variabilities were dominant in the zonal and vertical directions. In addition, semiannual variation in the HC depth was discovered. The longitude of the HC varies with ENSO events, and its latitude is weakly related to ENSO on time scales shorter than a decade. The variation of the HC longitude leads the Nifio-3 index by about 3-4 months, and its depth lags the index for approximately 3 months. It is concluded that the HC depth results from a combination of its longitudinal and latitudinal variations. Low-pass-filtered time series reveal that the HC has moved eastward since the mid 1980s.

关键词： western Pacific warm pool heat center variability

The role of oceanic feedbacks in the 2014–2016 El Niño events as derived from ocean reanalysis data

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2020年第5期38卷 1394-1407页

作者： GUAN Cong WANG Fan hu shijian Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Pilot National Laboratory for Marine Science and Technology(Qingdao) Qingdao 266237China College of Marine Science University of Chinese Academy of SciencesQingdao 266400China

Why did the predicted“super El Niño”fade out in the summer 2014 and the following year develop into one of the three strongest El Niño on record?Although some hypotheses have been proposed in previous studies,the quantitative contribution of oceanic processes to these events remains *** investigated the role of various oceanic feedbacks,especially in response to intra-seasonal westerly wind busts,in the evolution of the 2014–2016 El Niño events,through a detailed heat budget analysis using high temporal resolution Estimating the Circulation and Climate of the Ocean—Phase II(ECCO2)simulation outputs and satellite-based *** show that the Ekman feedback and zonal advective feedback were the two dominant oceanic processes in the developing phase of the warm event in the spring of 2014 and its decay in *** the 2015–2016 super El Niño event,the zonal advective feedback and thermocline feedback played a signifi cant role in the eastern Pacifi c ***,the thermocline feedback tended to weaken in the central Pacifi c where the zonal advection feedback became the dominant positive feedback.

关键词： El Niño-Southern Oscillation(ENSO) extreme El Niño zonal advective feedback thermocline feedback Ekman feedback inter-seasonal variability

Instability in boundary layer between the North Equatorial Current and underlying zonal jets based on mooring observations

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2020年第5期38卷 1368-1381页

作者： WANG Fujun FENG Junqiao WANG Qingye ZHANG Linlin hu shijian hu Dunxin Key Laboratory of Ocean Circulation and Wave Institute of OceanologyChinese Academy of SciencesQingdao 266071China Function Laboratory for Ocean Dynamics and Climate Qingdao National Laboratory for Marine Science and TechnologyQingdao 266000China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Instability/stability in the North Equatorial Current(NEC)basin is studied based on data obtained from nine moorings deployed at 8.5°N,10.5°N,11.0°N,12.5°N,13.0°N,15.0°N,15.5°N,17.5°N,and 18.0°N along 130.0°E during cruises in 2015–*** low latitudes,the Coriolis parameter and stratifi cation ratio play important roles in NEC stability,whereas velocity shear and the layer depth ratio are important for NEC stability in high *** the westward NEC,eastward zonal jets occur intermittently centered around 8.5°N,12.5°N,and 17.5°N along 130.0°*** to the NEC,the main body of these zonal jets also deepens with *** the boundary layer comprising the bottom NEC and upper zonal jets,the growth rate of the NEC is attributed not only to velocity shear but also to zonal jet velocity based on the longwave *** on the shortwave assumption,the growth rate is proportional to zonal jet velocity but has no relationship with velocity ***,the growth rate in the boundary layer is not zero at 8.5°N,12.5°N,and 13.0°N,where the velocity shear and zonal jets are larger than at other *** instability also occurs at the time node when the zonal jets are strong enough,although the mean zonal jets may disappear at this station.

关键词： instability North Equatorial Current(NEC) zonal jets

Multi-decadal trends in the tropical Pacific western boundary currents retrieved from historical hydrological observations

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2021年第4期64卷 600-610页

作者： shijian hu Xi LU Shihan LI Fan WANG Cong GUAN Dunxin hu Linchao XIN Jie MA CAS Key Laboratory'of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Pilot National Laboratory for Marine Science and Technology(Qingdao) Qingdao 266237China College of Marine Science University of Chinese Academy of SciencesQingdao 266071China

As large-scale ocean circulation is a key regulator in the redistribution of oceanic energy, evaluating the multi-decadal trends in the western Pacific Ocean circulation under global warming is essential for not only understanding the basic physical processes but also predicting future climate change in the western Pacific. Employing the hydrological observations of World Ocean Atlas 2018(WOA18) from 1955 to 2017, this study calculated the geostrophic currents, volume transport and multidecadal trends for the North Equatorial Current(NEC), the North Equatorial Countercurrent(NECC), the Mindanao Current(MC), the Kuroshio Current(KC) in the origin and the New Guinea Coastal Undercurrent(NGCUC) within tropical western Pacific Ocean over multi-decades. Furthermore, this study examined the contributions of temperature and salinity variations. The results showed significant strengthening trends in NEC, MC and NGCUC over the past six decades, which is mainly contributed by temperature variations and consistent with the tendency in the dynamic height pattern. Zonal wind stress averaged over the western Pacific Ocean in the same latitude of each current represents the decadal variation and multi-decadal trends in corresponding ocean currents, indicating that the trade wind forcing plays an important role in the decadal trend in the tropical western Pacific circulation. Uncertainties in the observed hydrological data and trends in the currents over the tropical western Pacific are also discussed. Given that the WOA18 dataset covers most of the historical hydrological sampling data for the tropical western Pacific, this paper provides important observational information on the multi-decadal trend of the large-scale ocean circulation in the western Pacific.

关键词： Pacific Western boundary current Multi-decadal trend Global variation Hydrological observation

热带太平洋—印度洋洋际交换及其气候效应的观测研究

在线全文

学校读者我要写书评

暂无评论

地球科学进展 2024年第8期39卷 788-800页

作者：魏泽勋徐腾飞方越王晶秦秉斌胡石建李颖聂珣炜张志祥李志曹智勇马强自然资源部第一海洋研究所山东青岛266061 崂山实验室山东青岛266237 中国科学院海洋研究所山东青岛266071

热带太平洋—印度洋洋际交换(简称洋际交换)主要通过太平洋—印度洋贯穿流实现,包括印尼贯穿流,不仅是印太洋盆间重要的质量、动量和能量通道,也是太平洋和印度洋之间气候异常信号传播的“海洋信号通道”,还是大西洋深层水体进行表层补... 详细信息

热带太平洋—印度洋洋际交换(简称洋际交换)主要通过太平洋—印度洋贯穿流实现,包括印尼贯穿流,不仅是印太洋盆间重要的质量、动量和能量通道,也是太平洋和印度洋之间气候异常信号传播的“海洋信号通道”,还是大西洋深层水体进行表层补偿从而使大洋传送带闭合的关键环节,因此在全球海洋和气候系统中占有重要地位。国内外对洋际交换海域环流和气候的研究极其重视,自20世纪90年代以来,来自不同国家的学者开始开展观测研究。我国学者2007年起在洋际交换的主要海峡通道、源区及出流海域开展现场观测,成为国际上洋际交换观测的主要力量。以国内外学者基于这些观测资料取得的科学认识为主线,围绕洋际交换的多尺度变化、跨尺度和跨海盆相互作用,以及对太平洋和印度洋主要气候模态的调制作用4个方面,对其研究现状、主要进展以及亟待解决的关键科学问题进行梳理,同时,对未来5~10年的攻关重点与目标进行了展望。

关键词：洋际交换海洋观测印尼贯穿流南海分支多尺度变化气候变化

Dynamic features of near-inertial oscillations in the Northwestern Pacific derived from mooring observations from^2015 to 2018

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2020年第4期38卷 1092-1107页

作者： hu shijian LIU Lingling GUAN Cong ZHANG Linlin WANG Jianing WANG Qingye MA Jie WANG Fujun JIA Fan FENG Junqiao LU Xi WANG Fan hu Dunxin CAS Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Pilot National Laboratory for Marine Science and Technology(Qingdao) Qingdao 266237China College of Marine Science University of Chinese Academy of SciencesQingdao 266071China

Near-inertial oscillation is an important physical process transferring surface wind energy into deep *** investigated the near-inertial kinetic energy(NIKE)variability using acoustic Doppler current profiler measurements from a mooring array deployed in the tropical western Pacific Ocean along 130°E at 8.5°N,11°N,12.6°N,15°N,and 17.5°N from September 2015 to January *** features,decay timescales,and significant seasonal variability of the observed NIKE were *** the mooring sites of 17.5°N,15°N,and 12.6°N,the NIKE peaks occurred in boreal autumn and the NIKE troughs were observed in boreal *** contrast,the NIKE at 11°N and 8.5°N showed peaks in winter and troughs in *** cyclones and strong wind events played an important role in the emergence of high-NIKE events and explained the seasonality and latitudinal characteristics of the observed NIKE.

关键词： near-inertial kinetic energy western Pacific Ocean tropical cyclones mooring array seasonal variability

Construction of Pd-doped RuO_(2) nanosheets for efficient and stable acidic water oxidation

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2024年第6期9卷 937-948页

作者： Yibo Liu Xing hu Chenxi Liu Shan Zhu Kezhu Jiang Feng Liu shijian Zheng Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology College of Materials Science and EngineeringHebei University of TechnologyTianjin300401China Yunnan Precious Metals Lab Co. LTDKunming650100China

RuO_(2) has been considered a potential alternative to commercial IrO_(2) for the oxygen evolution reaction(OER)due to its superior intrinsic ***,its inherent structure dissolution in acidic environments restricts its commercial *** this study,we report a novel Pd-doped ruthenium oxide(Pd–RuO_(2))nanosheet catalyst that exhibits improved activity and stability through a synergistic effect of Pd modulation of Ru electronic structure and the two-dimensional *** catalyst exhibits excellent performance,achieving an overpotential of only 204 mVat a current density of 10 mA cm^(-2).Impressively,after undergoing 8000 cycles of cyclic voltammetry testing,the overpotential merely decreased by 5 *** PEM electrolyzer with Pd0.08Ru0.92O_(2) as an anode catalyst survived an almost 130 h operation at 200 mA cm^(-2).To elucidate the underlying mechanisms responsible for the enhanced stability,we conducted an X-ray photoelectron spectroscopy(XPS)analysis,which reveals that the electron transfer from Pd to Ru effectively circumvents the over-oxidation of Ru,thus playing a crucial role in enhancing the catalyst's ***,density functional theory(DFT)calculations provide compelling evidence that the introduction of Pd into RuO_(2) effectively modulates electron correlations and facilitates the electron transfer from Pd to Ru,thereby preventing the overoxidation of ***,the application of the two-dimensional structure effectively inhibited the aggregation and growth of nanoparticles,further bolstering the structural integrity of the catalyst.

关键词： Oxygen evolution reaction Pd-doped ruthenium oxide Two-dimensional structure Electron transfer Stability

Suppressing the Undesirable Energy Loss in Solution-Processed Hyperfluorescent OLEDs Employing BODIPY-Based Hybridized Local and Charge-Transfer Emitter

在线全文

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2024年第2期7卷 372-380页

作者： Xuewei Nie Zafar Mahmood Denghui Liu Mengke Li Dehua hu Wencheng Chen Longjiang Xing shijian Su Yanping huo Shaomin Ji School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou 510006China State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices South China University of TechnologyGuangzhou 510640China

Hyperfluorescent organic light-emitting diodes(HF-OLEDs)approach has made it possible to achieve excellent device performance and color purity with low roll-off using noble-metal-free pure organic *** significant progress,the performance of HF-OLEDs is still unsatisfactory due to the existence of a competitive dexter energy transfer(DET)*** this contribution,two boron dipyrromethene(BODIPY)-based donor-acceptor emitters(BDP-C-Cz and BDP-N-Cz)with hybridized local and charge transfer characteristics(HLCT)are introduced in the HF-OLED to suppress the exciton loss by dexter mechanism,and a breakthrough performance with low-efficiency roll-off(0.3%)even at high brightness(1000 cd m^(-2))is *** is demonstrated that the energy loss via the DET channel can be suppressed in HF-OLEDs utilizing the HLCT emitter,as the excitons from the dark triplet state of such emitters are funneled to its emissive singlet state following the hot-exciton *** developed HF-OLED device has realized a good maximum external quantum efficiency(EQE)of 19.25%at brightness of 1000 cd m^(-2)and maximum luminance over 60000 cd m^(-2),with an emission peak at 602 nm and Commission International de L'Eclairage(CIE)coordinates(0.57,0.41),which is among the best-achieved results in solution-processed *** work presents a viable methodology to suppress energy loss and achieve high performance in the HF-OLEDs.

关键词： BODIPY hyperfluorescence organic light-emitting diodes solution-process

Review on observational studies of western tropical Pacific Ocean circulation and climate

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2020年第4期38卷 906-929页

作者： hu Dunxin WANG Fan SPRINTALL Janet WU Lixin RISER Stephen CRAVATTE Sophie GORDON Arnold ZHANG Linlin CHEN Dake ZHOU hui ANDO Kentaro WANG Jianing LEE Jae-Hak hu shijian WANG Jing ZHANG Dongxiao FENG Junqiao LIU Lingling VILLANOY Cesar KALUWIN Chalapan QU Tangdong MA Yixin Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Pilot National Laboratory for Marine Science and Technology(Qingdao) Qingdao 266237China Scripps Institution of Oceanography University of CaliforniaSan DiegoLa JollaCalifornia 92093USA Ocean University of China Qingdao 266100China School of Oceanography University of WashingtonSeattle WA 98195-7940USA LEGOS Universitéde ToulouseIRDCNESCNRSUPSToulouse 31520France Lamont‐Doherty Earth Observatory Columbia UniversityPalisadesNew York 10027USA State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural Resources(MNR)Hangzhou 310012China Research and Development Center for Global Change Japan Agency for Marine‐Earth Science and TechnologyYokosuka 237-0061Japan Ocean Circulation and Climate Research Korea Institute of Ocean Science and TechnologyBusan 49111Korea Joint Institute for the Study of the Atmosphere and Ocean University of WashingtonSeattleWashington 98195USA Marine Science Institute University of the PhilippinesDilimanQuezon City 1101Philippines School of Natural and Physical Sciences University of Papua New GuineaPortmoresby 134Papua New Guinea Joint Institute for Regional Earth System Sciences and Engineering University of CaliforniaLos Angeles CA 90095USA

The Western Tropical Pacific(WTP) Ocean holds the largest area of warm water(>28℃) in the world ocean referred to as the Western Pacific Warm Pool(WPWP),which modulates the regional and global climate through strong atmospheric convection and its *** WTP is unique in terms of its complex 3-D ocean circulation system and intensive multiscale variability,making it crucial in the water and energy cycle of the global *** advances have been made in understanding the complexity of the WTP ocean circulation and associated climate impact by the international scientific community since the 1960 s through field *** this study,we review the evolving insight to the 3-D structure and multi-scale variability of the ocean circulation in the WTP and their climatic impacts based on in-situ ocean observations in the past decades,with emphasis on the achievements since *** challenges and open que stions remaining are reviewed as well as future plan for international study of the WTP ocean circulation and climate.

关键词： Western Tropical Pacific(WTP) ocean circulation climate observation