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Optimizing the key parameter to accelerate the recovery of AMOC under a rapid increase of greenhouse gas forcing

Atmospheric and oceanic Science Letters 2025年第1期18卷 39-45页

作者： Haolan Ren Fei Zheng Tingwei Cao Qiang Wang International center for Climate and Environment Science(ICCES) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina College of oceanography Hohai UniversityNanjingChina CAS Key Laboratory of ocean Circulation and Waves Institute of OceanologyChinese Academy of Sciences and Pilot National Laboratory for Marine Science and Technology(Qingdao)QingdaoChina

Atlantic Meridional Overturning Circulation(AMOC)plays a central role in long-term climate variations through its heat and freshwater transports,which can collapse under a rapid increase of greenhouse gas forcing in climate *** studies have suggested that the deviation of model parameters is one of the major factors in inducing inaccurate AMOC *** this work,with a low-resolution earth system model,the authors try to explore whether a reasonable adjustment of the key model parameter can help to re-establish the AMOC after its *** a new optimization strategy,the extra freshwater flux(FWF)parameter is determined to be the dominant one affecting the AMOC’s *** traditional ensemble optimal interpolation(EnOI)data assimilation and new machine learning methods are adopted to optimize the FWF parameter in an abrupt 4×CO_(2) forcing experiment to improve the adaptability of model parameters and accelerate the recovery of *** results show that,under an abrupt 4×CO_(2) forcing in millennial simulations,the AMOC will first collapse and then re-establish by the default FWF parameter ***,during the parameter adjustment process,the saltier and colder sea water over the North Atlantic region are the dominant factors in usefully improving the adaptability of the FWF parameter and accelerating the recovery of AMOC,according to their physical relationship with FWF on the interdecadal timescale.

关键词： Recovery of AMOC 4×CO_(2)forcing Key parameter Parameter estimation Data assimilation Machine learning

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Research on Pitch Control Strategies of Horizontal Axis Tidal Current Turbine

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China ocean Engineering 2020年第2期34卷 223-231页

作者： WANG Bing-zhen HU Teng-yan GUO Yi ZHANG Yuan-fei national ocean technology center Tianjin 300112China

Based on blade element momentum theory and generator characteristic test,a dynamic simulation model of 150 kW horizontal-axis tidal current turbine was *** matching of the dynamic characteristics between the turbine and generator under various current velocities is studied,and the influence of the pitch angle on the matching is *** the problem of maximum power output in case of low current speed and limiting power in high current speed,the relation between optimal pitch angle and output power is *** the basis of dynamic characteristic analysis,the variable pitch control strategy is *** performance of the turbine under various tidal conditions is *** research results show that the designed controller enables the turbine to operate efficiently under the condition of low current speed,and achieve the goal of limited power at high current speed.

关键词： tidal energy horizontal axis tidal current turbine(HATT) pitch control simulation

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Study on Hydrography and Small-Scale Process over Zhoushan Sea Area

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Journal of ocean University of China 2015年第5期14卷 829-834页

作者： WU He DU Min WANG Xiaoyong MENG Jie national ocean technology center

This paper mainly analyzes the tidal characteristics and small-scale mixing process near Zhoushan Islands. First, the spectral analysis and wavelet analysis are adopted for the measured tide level data and tidal current data from the Zhoushan sea area, which indicate that the main tidal cycle near Hulu Island and Taohua Island is semi-diurnal cycle, the diurnal cycle is subordinate. Both their intensities are changed periodically, meanwhile, the diurnal tide becomes stronger when semi-diurnal tide becomes weak. The intensity of baroclinie tidal current weakens at first and then strengthens from top to bottom. Then, in this paper, the Gregg-Henyey （G-H） parameterization method is adopted to calculate the turbulent kinetic energy dissipation rate based on the measured temperature and tidal current data. The results of which shown that the turbulent kinetic energy dissipation rate around Hulu Island is higher than that around Taohua Island. In most cases, the turbulent kinetic energy dissipation rate during spring tide is larger than that during the neap tide; the turbulent kinetic energy dissipation rate in the surface layer and the bottom layer are higher than that in the intermediate water; the changes of turbulent kinetic energy dissipation rate and tidal current are basically synchronous The modeled turbulent kinetic energy dissipation rate gets smaller with the increase of the stratification, however, gets larger with the increase of shearing.

关键词： tidal characteristics parameterization method turbulent kinetic energy dissipation rate

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Measurement and feature analysis of absorption spectra of four algal species

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Chinese Journal of oceanology and Limnology 2017年第2期35卷 350-359页

作者：朱建华周虹丽韩冰李铜基 national ocean technology center Tianjin 300111 China

Two methods for particulate pigments(i.e.,quantitative filter technique,QFT,and in vivo measurement,InVivo,respectively)and two methods for dissolved pigments(i.e.,Acetone Extracts,AceEx,and high-performance liquid chromatography,HPLC,respectively) were used to obtain the optical absorption coefficient spectra for cultures of four typical algal *** normalization and analysis of the spectra,it is shown that(1) the four methods are able to measure optical absorption spectra of particulate and/or dissolved pigments;(2)that the optical absorption spectra of particulate and dissolved pigments were consistent in terms of the peak position in the blue wavelength,and the difference of the peak position in the near infrared wavelength was ~10nm between each other;and(3)that the leveling effect of the absorption spectra of particulate pigments was *** four methods can all effectively measure the absorption coefficients of phytoplankton pigments,while each one has its unique advantages in different ***,appropriate method should be carefully selected for various application due to their intrinsic difference.

关键词： algal species optical absorption coefficient spectral pattern normalization

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Quality control methods for KOOS operational sea surface temperature products

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Acta oceanologica Sinica 2016年第2期35卷 11-18页

作者： YANG Chansu KIM Sunhwa Korea ocean Satellite Research center Korea Institute of Ocean Science and Technology ocean Science and technology School Korea Maritime and Ocean University Marine Environmental System Science Korea University of Science and Technology

Sea surface temperature SST obtained from the initial version of the Korea Operational oceanographic System（KOOS） SST satellite have low accuracy during summer and daytime. This is attributed to the diurnal warming effect. Error estimation of SST data must be carried out to use the real-time forecasting numerical model of the KOOS. This study suggests two quality control methods for the KOOS SST system. To minimize the diurnal warming effect, SSTs of areas where wind speed is higher than 5 m/s were used. Depending on the wind threshold value, KOOS SST data for August 2014 were reduced by 0.15°C. Errors in SST data are considered to be a combination of random, sampling, and bias errors. To estimate bias error, the standard deviation of bias between KOOS SSTs and climatology SSTs were used. KOOS SST data yielded an analysis error standard deviation value similar to OSTIA and NOAA NCDC（OISST） data. The KOOS SST shows lower random and sampling errors with increasing number of observations using six satellite datasets. In further studies, the proposed quality control methods for the KOOS SST system will be applied through more long-term case studies and comparisons with other SST systems.

关键词： SST quality control diurnal effect bias error standard deviation

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Generation of high resolution sea surface temperature using multi-satellite data for operational oceanography

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Acta oceanologica Sinica 2015年第7期34卷 74-88页

作者： YANG Chan-Su KIM Sun-Hwa OUCHI Kazuo BACK Ji-Hun Korea ocean Satellite center Korea Institute of Ocean Science & Technology (KIOST) ocean Science and technology School Korea Maritime and Ocean University Marine Environmental System Science Korea University of Science and Technology

In the present article, we introduce a high resolution sea surface temperature （SST） product generated daily by Korea Institute of ocean Science and technology （KIOST）. The SST product is comprised of four sets of data including eight-hour and daily average SST data of I km resolution, and is based on the four infrared （IR） satellite SST data acquired by advanced very high resolution radiometer （AVHRR）, Moderate Resolution Imaging Spectroradiometer （MODIS）, Multifunctional Transport Satellites-2 （MTSAT-2） Imager and Meteorological Imager （MI）, two microwave radiometer SSTs acquired by Advanced Microwave Scanning Radiometer 2 （AMSR2）, and WindSAT with in-situ temperature data. These input satellite and in-situ SST data are merged by using the optimal interpolation （OI） algorithm. The root-mean-square-errors （RMSEs） of satellite and in-situ data are used as a weighting value in the OI algorithm. As a pilot product, four SST data sets were generated daily from Ianuary to December 2013. In the comparison between the SSTs measured by moored buoys and the daily mean KIOST SSTs, the estimated RMSE was 0.71~C and the bias value was -0.08~C. The largest RMSE and bias were 0.86 and -0.26~C respectively, observed at a buoy site in the boundary region of warm and cold waters with increased physical variability in the Sea of Iapan/East Sea. Other site near the coasts shows a lower RMSE value of 0.60~C than those at the open waters. To investigate the spatial distributions of SST, the Group for High Resolution Sea Surface Temperature （GHRSST） product was used in the comparison of temperature gradients, and it was shown that the KIOST SST product represents well the water mass structures around the Korean Peninsula. The KIOST SST product generated from both satellite and buoy data is expected to make substantial contribution to the Korea Operational oceanographic System （KOOS） as an input parameter for data assimilation.

关键词： SST satellite in-situ high resolution OI

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Prediction of Cold Dwell-Fatigue Crack Growth of Titanium Alloys

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Acta Metallurgica Sinica(English Letters) 2015年第5期28卷 619-627页

作者： Ke Wang Fang Wang Wei-Cheng Cui A.-Li Tian School of Naval Architecture and ocean Engineering Shanghai Jiao Tong University Hadal Science and technology Research center (Shanghai Engineering Research center of Hadal Science and technology) Shanghai Ocean University School of Naval Architecture and ocean Engineering Jiangsu University of Science and Technology

The dwell effect of the material can reduce the fatigue lives of titanium alloys at room temperature. A unified fatigue life prediction method developed by the authors＇ group is modified in this paper to predict dwell-fatigue crack growth taking into account the effects of dwell time and maximum stress. The modified model can be successfully used to predict the crack growth rate and calculate the fatigue life of different titanium alloys under pure fatigue and dwell-fatigue conditions. It is validated by comparing prediction results with the experimental data of several titanium alloys with different microstructures, dwell time, hydrogen contents, stress ratios and stress levels.

关键词： Titanium alloy Dwell-fatigue Fatigue Crack growth

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Absolute calibration of HY-2A and Jason-2 altimeters for sea surface height using GPS buoy in Qinglan, China

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Journal of oceanology and Limnology 2019年第5期37卷 1533-1541页

作者： CHEN Chuntao ZHU Jianhua ZHAI Wanlin YAN Longhao ZHAO Yili HUANG Xiaoqi YANG Weiwei national ocean technology center Ministry of Natural Resources (MNR)

GPS buoy methodology is one of the main calibration methodologies for altimeter sea surface height calibration. This study introduces the results of the Qinglan calibration campaign for the HY-2A and Jason-2 altimeters. It took place in two time slices;one was from August to September 2014, and the other was in July 2015. One GPS buoy and two GPS reference stations were used in this campaign. The GPS data were processed using the real-time kinematic (RTK) technique. The fi nal error budget estimate when measuring the sea surface height (SSH) with a GPS buoy was better than 3.5 cm. Using the GPS buoy, the altimeter bias estimate was about -2.3 cm for the Jason-2 Geophysical Data Record (GDR) Version ‘D' and from -53.5 cm to -75.6 cm for the HY-2A Interim Geophysical Data Record (IGDR). The bias estimates for Jason-2 GDR-D are similar to the estimates from dedicated calibration sites such as the Harvest Platform, the Crete Site and the Bass Strait site. The bias estimates for HY-2A IGDR agree well with the results from the Crete calibration site. The results for the HY-2A altimeter bias estimated by the GPS buoy were verifi ed by cross-calibration, and they agreed well with the results from the global analysis method.

关键词： HY-2A altimeter calibration GPS buoy sea surface height Jason-2 altimeter

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Analog rise-time discriminator for CdZnTe detector

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Nuclear Science and Techniques 2017年第4期28卷 59-65页

作者： Chuan-Hao Hu Guo-Qiang Zeng Liang-Quan Ge Shi-Long Wei Jian Yang Qiang Li Hong-Zhi Li Chengdu University of technology Chengdu 610059 China national ocean technology center Tianjin 300112 China

Due to variable time for charge collection,energy resolution of nuclear detectors declines,especially compound semiconductor detectors like cadmium zinc telluride(CdZnTe) *** solve this problem,an analog rise-time discriminator based on charge comparison principle is *** reference charge signal after attenuation is compared with the deconvoluted and delayed current *** is found that the amplitude of delayed current signal is higher than that of the reference charge signal when rise time of the input signal is shorter than the discrimination time,thus generating gating signal and triggering DMCA(digital multi-channel analyzer) to receive the total integral charge *** rise time of the input signal is longer than discrimination time,DMCA remains inactivated and the corresponding total integral charge signal is *** results show that combination of the designed rise-time discriminator and DMCA can reduce hole tailing of CdZnTe detector *** resolution of the system is 0.98%@662 keV,and it is still excellent under high counting rates.

关键词： Analog rise-time discriminator CdZnTe detector Charge comparison principle

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High-resolution circulation forecasting of the Maenggol Channel, south coast of Korea

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Acta oceanologica Sinica 2015年第12期34卷 11-18页

作者： CHOI Jinyong JUN Kicheon CHOI Youngkwang CHO Kyoungho KWON Jae-Il PARK Jinsoon PARK Kwangsoon Operational oceanography Research center Korea Institute of Ocean Science and Technology Task Force for Construction of RV ISABU Support Facility Korea Institute of Ocean Science and Technology Division of Polar ocean Environment Korea Polar Research Institute China-Korea Joint ocean Research center Coastal Development Research center Korea Institute of Ocean Science and Technology

The Maenggol Channel and Uldolmok Strait, located on the south-west coast of Korea, have notably strong and complex currents due to tidal effects and to local geological factors. In these areas, electric power has been generated using strong tidal currents, the speed of which is more than 3 m/s during spring tides. The region also provides a shortcut for navigation. These tidal conditions are therefore sometimes useful, but may also cause terrible accidents or severe economic damage, in the absence of accurate information regarding ocean conditions. In April 2014, the passenger ferry MV Sewol capsized in the Maenggol Channel, with 295 passengers killed and 9 still missing. While this was unquestionably a man-made disaster, strong currents were one of the contributing causes. It was also difficult to conduct scuba diving rescue operations given strong current speeds,and accurate prediction of the time when the tide would turn was thus critically needed. In this research, we used the high-resolution coastal circulation forecasting system of KOOS（Korea Operational oceanographic System） for analysis and simulation of strong tidal currents in such areas with many small islands, using measurements and modeling from this research area. For accurate prediction of tidal currents, small grid size-modeling was needed,and in this study, we identified a suitable grid size that offers efficiency as well as accuracy.

关键词： Maenggol Channel Sewol ferry accident circulation forecasting

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