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Contrasting physical mechanisms of yellowfin tuna fluctuations between the western and eastern Indian Ocean

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Journal of Oceanology and Limnology 2024年第3期42卷 960-971页

作者： Peng LIAN le gao Key Laboratory of Ocean Observation and Forecasting and Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Laboratory for Ocean Dynamics and Climate Laoshan LaboratoryQingdao 266061China

As an economically critical pelagic migratory species,yellowfin tuna(Thunnus albacores,YFT)is very sensible to physical and environmental conditions,such as sea surface temperature(SST),ocean heat content(OHC),and the mixed layer depth(MLD).We investigated the impact of SST,OHC,and MLD on fluctuations of YFT catch in the western/eastern Indian Ocean using the long time series of 63-year environmental and YFT *** found that the impact of SST on YFT was heavily overestimated in the past,and MLD plays a more critical role in the YFT catch *** the MLD deepens(>34.8 m),SST was more influential in predicting the catches of YFT than OHC in the western Indian Ocean,and OHC was more critical to YFT than SST in the eastern Indian ***,when the MLD shallows(<34.8 m),MLD was more vital to predict the catch per unit effort(CPUE)of YFT than SST/OHC in the *** 2000,there was an asynchronous pattern of YFT CPUE induced by higher frequency variations and ocean hiatus of SST/OHC signals in the western and eastern Indian Oceans *** impact of the subsurface hiatus may induce the decrease of YFT in the eastern Indian *** above findings clarified a non-stationary relationship between the environmental factors and catches of YFT and provided new insights into variations in YFT abundance.

关键词： yellowfin tuna Indian Ocean sea surface temperature(SST) ocean heat content(OHC) mixed layer depth(MLD) hiatus

Impacts of central-Pacific El Niño and physical drivers on eastern Pacific bigeye tuna

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Journal of Oceanology and Limnology 2024年第3期42卷 972-987页

Bigeye tuna Thunnus obesus is an important migratory species that forages deeply,and El Niño events highly influence its distribution in the eastern Pacific *** sea surface temperature is widely recognized as the main factor affecting bigeye tuna(BET)distribution during El Niño events,the roles of different types of El Niño and subsurface oceanic signals,such as ocean heat content and mixed layer depth,remain *** conducted A spatial-temporal analysis to investigate the relationship among BET distribution,El Niño events,and the underlying oceanic signals to address this knowledge *** used monthly purse seine fisheries data of BET in the eastern tropical Pacific Ocean(ETPO)from 1994 to 2012 and extracted the central-Pacific El Niño(CPEN)indices based on Niño 3 and Niño ***,we employed Explainable Artificial Intelligence(XAI)models to identify the main patterns and feature importance of the six environmental variables and used information flow analysis to determine the causality between the selected factors and BET ***,we analyzed Argo datasets to calculate the vertical,horizontal,and zonal mean temperature differences during CPEN and normal years to clarify the oceanic thermodynamic structure differences between the two types of *** findings reveal that BET distribution during the CPEN years is mainly driven by advection feedback of subsurface warmer thermal signals and vertically warmer habitats in the CPEN domain area,especially in high-yield fishing *** high frequency of CPEN events will likely lead to the westward shift of fisheries centers.

关键词： bigeye tuna central-Pacific El Niño(CPEN) ocean heat content Argo explainable artificial intelligence(XAI) information flow

Application of uniform DFT filter bank in radar jamming system

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Journal of Systems Engineering and Electronics 2006年第3期17卷 527-530页

作者： Dai le gao Meiguo Dept. of Electronics Engineering of the Beijing Institute of Technology Beijing 100081 P. R. China

The principle of uniform DFT filter bank is presented. Exploiting poly-phase structure, radar jamming system samples the intercepted wideband radar signals through analysis filter bank by different channels and linearly modulates the intercepted radar signal according to the theory of signal and system, then synthesizes the jamming signal through the synthesis filter hank. The method merely requires lower sample frequency, reduces the computational complexity and the data quantity to be processed. The un-ideal filter＇s influence to the result of signals processing is analyzed by simulating the match filter in radar jamming system.

关键词： repeater jamming high resolution radar filter bank poly-phase structure FDT

Quantification of the impact of environmental factors on chlorophyll in the open ocean

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Journal of Oceanology and Limnology 2021年第2期39卷 447-457页

作者： Dandan ZHAO le gao Yongsheng XU Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Ocean and Climate Dynamics Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of Sciences Qingdao 266071China

Many previous studies of the impact of oceanic environmental factors on chlorophyll(CHL)in a specific region focused on sea surface temperature(SST),mixed-layer depth(MLD),or wind stress(WS)*** this study,relationship between CHL and all those environmental factors(SST,MLD,and WS)in the open ocean was quantified for five regions within the subtropical gyres and the variation trend of 13-year(2003–2015)was analyzed using satellite observations and Argo *** correlation analysis results show that MLD was correlated positively with CHL,SST was correlated negatively with CHL,and the correlation between CHL and WS was either positive or *** on the significance of the correlations,models representing the relationships were established using the multiple linear regression and analyzed,showing that the environmental factors were the major determinants of CHL *** regression coefficients show that both SST and MLD have remarkable effect on *** derived models could be used to diagnose the past changes,understand present variability,and predict the future state of CHL changes based on environmental factors,and help us understand the dynamics of CHL variation in the open ocean.

关键词： chlorophyll(CHL) mixed layer depth(MLD) multiple linear regression sea surface temperature(SST)

Effects of mating status on copulation investment by male bushcricket Gampsocleis gratiosa (Tettigoniidae, Orthoptera)

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Science China(Life Sciences) 2006年第4期49卷 349-353页

作者： gao Yong KANG le Stake Key Laboratory of Integrated Management of Pest Insects & Rodents Institute of Zoology Chinese Academy of Sciences Beijing 100080 China Stake Key Laboratory of Integrated Management of Pest Insects & Rodents Institute of Zoology Chinese Academy of Sciences Beijing 100080 China

Male’s copulation investment, including spermatophore; sperm investment were very high in the Chinese bushcricket Gampsocleis gratiosa. The effects of mating status of both males; females on male’s copulation investment were examined in this study. The fresh weight of spermatophylax increased positively with the weight of males’ body. This indicated that the nutritional investment during copulation depended on male’s quality. Spermatophore investment showed insignificant differences in every copulation protocols. This finding supported the paternal investment hypothesis, that is, males contributed to their offspring with little attention to their partners. Sperm releasing per ejaculation varied significantly among the trials. Males decreased 54.19% sperm in second mating than in its first mating, demonsrated that males regarded the first mating highly,; were more prudent in subsequent mating. These males’ strategies may contribute to the viability of the offspring.

关键词： virgin effect, ejaculate size, copulation investment, Gampsocleis gratiosa.

A Contour Integral Method for Linear Differential Equations in Complex Plane

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Wuhan University Journal of Natural Sciences 2020年第6期25卷 489-495页

作者： gao le WANG Wenshuai School of Mathematics and Statistics Ningxia UniversityYinchuan 750021NingxiaChina

This paper presents the contour integral method for solving the linear constant coefficient ordinary differential equations in complex plane,and obtains the uniform expressions of the general ***,by using Residue Theorem,the general form of the contour integral representation for the homogeneous complex differential equation is obtained,which can be degenerated to classical results in real *** for inhomogeneous complex differential equations with constant coefficients,we construct the integral expression of the particular solution for any continuous forcing term,and give rigorous proof via Residue *** the general solutions of inhomogeneous complex differential equations are also *** main purpose of this paper is to give a foundation for a complete theory of linear complex differential equations with constant coefficients by a contour integral *** results can not only solve the inhomogeneous complex differential equation well,but also explain the forms that are difficult to be understood in the classical solutions.

关键词： complex differential equation contour integral method Residue Theorem general solution particular solution

A Simple and Selective Procedure for α-Bromination of Alkanones with [Bmim]Br_3 as a Promoter under Solvent-free Conditions

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Chinese Chemical letters 2005年第12期16卷 1590-1592页

作者： Sheng Jian ZHANG Zhang gao le Ningbo Institute of Technology Zhejiang University Ningbo 315100 Department of Applied Chemistry East China Institute of Technology Fuzhou 344000

Reaction of alkanones with 1-butyl-3-methylimidazolium tribromide （[Bmim]Br3） under solvent-free conditions, selectively gave the corresponding ct-bromoalkanones with excellent yields.

关键词： Alkanone ionic liquid [Bmim]Br3

Mechanism Underlying Antitumor Effects of Sinomenine

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Chinese Journal of Integrative Medicine 2019年第11期25卷 873-878页

作者： gao le-nyu ZHONG Bing WANG Yong Department of Traditional Chinese Medicine Southwest Hospital the Third Military Medical University (Army Military Medical University)

Sinomenine(SIN) is a bioactive alkaloid compound extracted from a Chinese medicinal plant Sinomenium acutum. It is a multitarget antitumor natural substance. Various mechanisms have been proposed for the antitumor effects of SIN, such as direct cytotoxicity, induction of apoptosis, sensitization attenuating radiotherapy and chemotherapy, reversal of drug resistance, resistance to distant metastasis, and antiangiogenesis. SIN can be used as a tumor cell killer and an adjuvant to radiotherapy and chemotherapy. However, recent studies are mostly limited to the basic experimental stage; no systematic clinical studies have yet been reported. Therefore, this paper aimed to review the mechanism underlying the antitumor effects of SIN by consulting relevant domestic and foreign studies and to provide a relevant reference for further development, use, and exploration of SIN.

关键词： antitumor mechanism pharmacology sinomenine Chinese medicine

Effect of random phase error and baseline roll angle error on eddy identification by interferometric imaging altimeter

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Journal of Oceanology and Limnology 2022年第5期40卷 1881-1888页

作者： le gao Hanwei SUN Jifeng QI Qiufu JIANG CAS Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of Sciences and Center for Ocean Mega-ScienceChinese Academy of SciencesQingdao 266071China Beijing Radio Measurement Institute Beijing 100854China Pilot National Laboratory for Marine Science and Technology(Qingdao) Qingdao 266237China

To achieve better observation for sea surface,a new generation of wide-swath interferometric altimeter satellites is *** satellite launch,it is particularly important to study the data processing methods and carry out the detailed error analysis of ocean satellites,because it is directly related to the ultimate ability of satellites to capture ocean *** this purpose,ocean eddies are considered a specific case of ocean signals,and it can cause significant changes in sea surface *** is suitable for theoretical simulation of the sea surface and systematic simulation of the *** analyzed the impacts of random error and baseline error on the sea surface and ocean signals and proposed a combined strategy of low-pass filtering,empirical orthogonal function(EOF)decomposition,and linear fitting to remove the *** this strategy,sea surface anomalies caused by errors were considerably improved,and the capability of satellite for capturing ocean information was ***,we found that the baseline error in sea surface height data was likely to cause inaccuracy in eddy boundary detection,as well as false eddy *** abnormalities could be prevented for"clean"sea surface height after the errors removal.

关键词： interferometric altimetry baseline error random error ocean eddy theoretical and systematic simulation error removal strategy