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Analysis of Seasonal Differences of Chlorophyll,Dimethylsulfide,and Ice Between the Greenland Sea and the Barents Sea

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Journal of Ocean University of China 2023年第6期22卷 1592-1604页

作者： ZHONG Guangsheng qu bo School of Science Nantong University226019China

Arctic Ocean(AO)climate is closely related to sea ice concentration(ICE)and chlorophyll_a(CHL)*** 2003–2014,the spatial average concentrations of CHL,ICE,sea surface temperature(SST),wind speed(WIND)in the Greenland Sea region(GS)(20˚W–10˚E,70˚–80˚N)and the Barents Sea region(BS)(30˚–50˚E,70˚–80˚N)are analysed and *** CHL was observed in BS,about 60%higher than that in *** with the northern regions of BS and GS(BSN and GSN),CHL in the southern region of BS and GS(BSS and GSS)increased by 77%and 42%*** ice melting in BSN is the main reason for phytoplankton *** 2010,there was an unusual peak of CHL concentration in *** sea-sonal peaks of CHL appeared two weeks earlier in BS than in *** earlier and more extensive ice melting and the persistent nega-tive North Atlantic Oscillation(NAO)index may be the reasons for higher CHL blooms in *** spatial average ICE concentra-tion of BS in BSN and BSS is 27%and 1.2%*** NAO in the previous winter may lead to an increase in ICE in *** has a great influence on CHL and ICE in *** melting is positively correlated with CHL,especially in GS in recent decades,CHL has a significant positive correlation with surface mass concentration of dimethylsulfide(DMS),especially in *** an indicator of Arctic warming,BS needs more attention from Arctic researchers.

关键词： dimethylsulfide chlorophyll ice North Atlantic Oscillation Arctic

Vertical Chlorophyll and Dimethylsulfide Profile Simulations in Southern Greenland Sea

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Journal of Ocean University of China 2022年第6期21卷 1565-1574页

作者： qu bo SUN Wenjing School of Science Nantong UniversityNantong 226007China YK Pao School Middle School CampusShanghai 200336China

Biogenetic sulfide dimethylsulfide(DMS)plays a major role on the global climate,especially in Arctic *** simulate DMS concentration is an important *** we introduced both biogeochemical depth-averaged model G93 and its extension model-one dimensional DMS *** surface concentrations,vertical profiles of chlorophyll(CHL)and DMS are simulated using the two models within southern Greenland Sea(0°E–10°E,70°N–75°N)during year *** the input data for the models simulations,the spatial monthly mean of methodology forcings including sea surface temperature(SST),wind speed(WIND),cloud cover(CLD),sea ice concentration(ICE)and mixed layer depth(MLD)are *** 8-day time series of chlorophyll-a(CHL)are used as observation data for CHL related parameter ***ó’s imperial formula is used as the monthly DMS observation *** Genetic Algorithm technique is used for the parameter *** simulation results show that the most DMS related surface concentrations exhibit the normal distributions with peak during ***,DMS and DMSP(dimethylsulphoniopropionate)vertical profiles are obtained for July,August and September in year *** had the higher variation of subsurface concentration maximum(SCM)in July with the lower surface concentration *** had surface higher and subsurface lower profile for the all three *** also had subsurface high in *** SCM CHL diurnal variation in the subsurface also can be resulted from diurnal changes in MLD and vertical mixing variations,plus photolysis and wind-driven ventilations.

关键词： dimethylsulfide vertical profile chlorophyll biogeochemical modeling Greenland Sea

Recent Trends in Satellite-Derived Chlorophyll and Aerosol Optical Depth Together with Simulated Dimethylsulfide in the Eastern China Marginal Seas

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Journal of Ocean University of China 2022年第2期21卷 486-498页

作者： qu bo GABRIC Albert J. School of Science Nantong UniversityNantong 266000China School of Environment and Science Griffith UniversityBrisbaneQLDAustralia

The biogenic compound dimethylsulfide(DMS)produced by a range of marine biota is the major natural source of re-duced sulfur to the atmosphere and plays a major role in the formation and evolution of aerosols,potentially affecting *** spatio-temporal distribution of satellite-derived chlorophyll_a(CHL)and aerosol optical depth(AOD)for the recent years(2011-2019)in the Eastern China Marginal Seas(ECMS)(25°-40°N,120°-130°E)are *** seasonal CHL peaks occurred during late April and the CHL distribution displays a clear zonal *** CHL was also observed along the northern and western coastlines during summer and winter *** analysis shows that mean CHL decreases by about 10%over the 9-year study period,while AOD was higher in south and lower in north during summertime.A genetic algorithm technique is used to calibrate the key model parameters and simulations are carried out for 2015,a year when field data was *** simulation results show that DMS seawater concentration ranges from 1.56 to 5.88 nmol L^(−1) with a mean value of 2.76 nmol L^(−1).DMS sea-air flux ranges from 2.66 to 5.00mmol m^(−2) d^(−1) with mean of 3.80mmol m^(−2) d^(−1).Positive correlations of about 0.5 between CHL and AOD were found in the study region,with higher correlations along the coasts of Jiangsu and Zhejiang *** elevated CHL concentration along the west coast is correlated with increased sea-water concentrations of DMS in the *** results suggest a possible influ-ence of DMS-derived aerosol in the local ECMS atmosphere,especially along the western coastline of ECMS.

关键词： dimethylsulfide sea-to-air flux chlorophyll-a aerosol optical depth biogeochemical model Eastern China Marginal Seas

Determination of optimum operating conditions for production of polyhydroxybutyrate by activated sludge submitted to dynamic feeding regime

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Chinese Science Bulletin 2009年第1期54卷 142-149页

作者： qu bo LIU JunXin State key Laboratory of Environment Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences P.O. Box 2871 Beijing 100085 China

Polyhydroxybutyrate (PHB) was produced by activated sludge in a two-stage process. In the first stage,the sludge with high storage potential was enriched in a sequencing batch reactor (SBR) operated by a dynamic feeding regime. The biosynthesis of PHB was sequentially accomplished in a batch reactor in the second stage. This article focused on the optimization of PHB content by evaluating the effects of three critical factors: Dissolved oxygen,pH and food-to-microorganism (F/M) ratio in the batch reactor. The results showed that the rate of substrate uptake,as well as the yield and content of PHB increased with the increase of dissolved oxygen concentration. The control of pH was not necessary under the weak alkaline condition for improvement of PHB content,except for the case in which the pH value was out of rang of 7.0 to 10.0. The enhanced F/M ratio favored PHB accumulation in the range of 1.0 to 4.5 C-mmol/C-mmol and the highest PHB content,64%,was achieved at 4.5 C-mmol/C-mmol. When F/M ratio was enhanced to 6.0 C-mmol/C-mmol,the phenomenon of utilizing simultaneously intracellular PHB and external substrate by sludge was observed,which resulted in a sharp decrease of PHB con-tent. The microscopic observation clearly confirmed that dynamic feeding regime was effective for selecting and enriching the sludge with a high storage potential.

关键词：聚羟基丁酯活性软泥动态加料机制最适宜条件

Simulated perturbation in the sea-to-air flux of dimethylsulfi de and the impact on polar climate

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Journal of Oceanology and Limnology 2021年第1期39卷 110-121页

作者： bo qu Albert JGABRIC Rebecca JACKSON School of Science Nantong UniversityNantong 226219China School of Environment and Science Griffi th UniversityBrisbane 4111QLDAustralia

Marine biogenic emission of dimethylsulfi de(DMS)has been well recognized as the main natural source of reduced sulfur to the remote marine atmosphere and has the potential to aff ect climate,especially in the polar *** used a global climate model(GCM)to investigate the impact on atmospheric chemistry from a change to the contemporary DMS fl ux to that which has been projected for the late 21 st *** perturbed simulation corresponded to conditions that pertained to a tripling of equivalent CO 2,which was estimated to occur by year 2090 based on current worst-case greenhouse gas emission *** changes in zonal mean DMS fl ux were applied to 50°S–70°S Antarctic(ANT)and 65°N–80°N Arctic(ARC)*** results indicate that there are clearly diff erent impacts after perturbation in the southern and northern polar *** quantities related to the sulfur cycle show a higher increase in ***,most sulfur compounds have higher peaks in *** perturbation in DMS fl ux leads to an increase of atmospheric DMS of about 45%in ANT and 33.6%in *** sulfur dioxide(SO 2)vertical integral increases around 43%in ANT and 7.5%in ***(SO 4)vertical integral increases by 17%in ANT and increases around 6%in *** emissions increases by 21%in ANT and increases by 9.7%in ***,oxidation of DMS by OH increases by 38.2%in ARC and by 15.17%in *** optical depth(AOD)increases by 4%in the ARC and by 17.5%in the ANT,and increases by 22.8%in austral *** importance of the perturbation of the biogenic source to future aerosol burden in polar regions leads to a cooling in surface temperature of 1 K in the ANT and 0.8 K in the ***,polar regions in the Antarctic Ocean will have a higher off setting eff ect on warming after DMS fl ux perturbation.

关键词： dimethylsulfi de(DMS) sulfur dioxide DMS sea-to-air fl ux perturbation global climate model(GCM) polar region

Economic optimization on two time scales for a hybrid energy system based on virtual storage

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Journal of Modern Power Systems and Clean Energy 2018年第5期6卷 1004-1014页

作者： Jingjie YANG Bingqing GUO bo qu China Electric Power Research Institute

This paper proposes an economic optimization method with two time scales for a hybrid energy system based on the virtual storage characteristic of a thermostatically controlled load(TCL). The optimization process includes two time scales in order to ensure accuracy and efficiency. Based on the forecast load and energy supply of the system, the first time scale is day-ahead economic operating optimization, carried out to determine the minimum operating cost for the whole day, and to find the period of greatest cost to which the second time scale optimization is applied. Using the virtual storage characteristic, the second time scale is short-term detailed optimization carried out for these particular hours. By dispatching thermal load in this period and adjusting energy supply accordingly, we can find the optimal economic performance, and customer requests are taken into account to ensure satisfaction. A case study in Tianjin, China illustrates the effectiveness of this method and proves that a TCL can make a great contribution to improving the economic performance of a hybrid energy system.

关键词： Economic optimization Hybrid energy system Virtual storage Two time scales Heating ventilation and air conditioning(HVAC) system

KMnO4-mediated direct selective radical cross-coupling：An effective strategy for C2 arylation of quinoline N-oxide with arylboronic acids

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Chinese Chemical Letters 2017年第5期28卷 981-985页

作者： Jin-Wei Yuan Ling-bo qu School of Chemistry & Chemical Engineering Henan University of TechnologyAcademician Workstation for Natural Medicinal Chemistry of Henan Province

Direct C—H functionalization of quinoline N-oxides with arylboronic acids is achieved using KMnOas the sole and efficient oxidative *** method provides an efficient protocol to construct regioselectively 2-arylquinol... 详细信息

关键词： quinoline N-oxide Arylboronic acid KMnO_4-mediated Radical reaction Arylation

Comparison Between Early and Late 21stC Phytoplankton Biomass and Dimethylsulfide Flux in the Subantarctic Southern Ocean

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Journal of Ocean University of China 2020年第1期19卷 151-160页

作者： qu bo Albert JGABRIC JIANG Limei LI Chunyue School of Science Nantong UniversityNantong 226019China School of Environment and Science Griffith UniversityNathan Qld 4111Australia Nantong Chong Chuan School Nantong 226000China Marketing Thermo Fisher ScientificShanghai 201206China

Time-series of chlorophyll-a(CHL),a proxy for phytoplankton biomass,and various satellite-derived climate indicators are compared in a region of the Subantarctic Southern Ocean(40°-60°S,110°-140°E)for years *** reached a minimum in winter(June)and a maximum in late summer(early February).Zonal mean CHL decreased towards the *** sea surface temperature(SST)ranged between 8℃and 15℃and peaked in late *** and SST were positively correlated from March to June,negatively correlated from July to *** and wind speed(WIND)were negatively correlated with peak WIND occurred in *** direction(WIRD)was mostly in the southwest to westerly *** Antarctic Oscillation index(AAO)and CHL were negatively correlated(R=−0.58),indicating that as synoptic wind systems move southwards,CHL increases,and conversely when wind systems move northwards,CHL decreases.A genetic algorithm is used to calibrate the biogeochemical DMS model’s key *** 4×CO2(after year 2100)Regional mean SST increases 12%-17%,WIND increases 1.2ms−1,Cloud Cover increases 4.8%and mixed layer depth(MLD)decreases *** annual CHL increases 6.3%.The annual mean DMS flux increase 25.2%,increases 37%from day 1 to day 280 and decrease 3%from day 288 to day *** general increase of DMS flux under 4×CO2 conditions indicates the Subantarctic regional climate would be affected by changes in the DMS flux,with the potential for a cooling effect in the austral summer and autumn.

关键词： wind speed phytoplankton dimethylsulfide flux climate change subantarctic Southern Ocean

Effect of boron on CGHAZ Microstructure and Toughness of High Strength Low Alloy Steels

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Journal of Iron and Steel Research International 2014年第8期21卷 787-792页

作者： Han YANG Xi-xia WANG Jin-bo qu Institute of Research of Iron and Steel Sha-steel

Effect of boron on the microstructure and impact toughness in the coarse-grained heat-affected zone（CGHAZ）of two high strength low alloy steels,boron-free and boron-containing,was investigated by means of weld thermal simulation *** result shows that,for the boron-free steel,a microstructure consisting of grain boundary ferrite degenerates pearlite and granular bainite for longer t8/5（the cooling time from 800 to 500 ℃）,while lath bainite for shorter t8/*** the boron-containing steel,granular bainite is dominant for a wide range of t8/*** cooling transformation（CCT）study on the CGHAZ indicates that the transformation start temperature decreases by about 50-100℃under different t8/5,for the boron-containing steel compared with the boron-free *** presence of boron suppresses the nucleation of ferrite at prior austenite grain boundaries and hence enlarges the range of t8/5for granular bainite ***,the addition of boron deteriorates the impact toughness of CGHAZ,which may be due to a markedly increased fraction of martensite-austenite（M-A）constituents and decreased fraction of high angle grain boundaries.

关键词： boron high strength low alloy steel coarse-grained heat-affected zone continuous cooling transforma-tion impact toughness