As an economically crucial species in the southeast Pacific Ocean,understanding the spatiotemporal distribution changes of the habitat of Trachurus murphyi under the influence of climate change is essential for effect...As an economically crucial species in the southeast Pacific Ocean,understanding the spatiotemporal distribution changes of the habitat of Trachurus murphyi under the influence of climate change is essential for effective resource assessment and management.The spatiotemporal changes in suitable habitats of T.murphyi under three climate change scenarios(SSP 126,SSP 370,and SSP 585)of Phase 6 of the Coupled Model Intercomparison Project(CMIP 6)were explored based on key environmental factors affecting the potential distribution of the species in a habitat suitability index(HSI)model.Results show that seawater temperature would increase under different scenarios,while the mixed layer depths would decrease under SSP 370 and SSP 585 scenarios but vary slightly under the SSP 126 scenario,which is similar to the variation in different climate periods.The positive difference in seawater temperature will be distributed in the central,southern,and offshore regions of Chile,and the negative difference in mixed layer depths be accounted for a large region.Under different climate scenarios,the HSI value for fishing ground and the overall proportion of suitable habitat area of T.murphyi will be decreased over the forecasted period.The suitable habitat of T.murphyi is concentrated in the 42°S-47°S area and will move to the southwest in different climate periods.Based on short-term climate change,the proportion of suitable habitat areas in the high seas of Chile is larger than in the exclusive economic zone under medium-and long-term climate change under different scenarios.The results of the gravity center of suitable T.murphyi habitat indicates that the spatial distribution of T.murphyi might be related to variations in oceanic currents.These findings provide insights for the effective fisheries resource management of T.murphyi in the Southeast Pacific Ocean.展开更多
The generalized linear model （GLM） and generalized additive model （GAM） were applied to the standardization of catch per unit effort （CPUE） for Chilean jack mackerel from Chinese factory trawl fishing fleets in ...The generalized linear model （GLM） and generalized additive model （GAM） were applied to the standardization of catch per unit effort （CPUE） for Chilean jack mackerel from Chinese factory trawl fishing fleets in the Southeast Pacific Ocean from 2001 to 2010 by removing the operational, environmental, spatial and temporal impacts. A total of 9 factors were selected to build the GLM and GAM, i.e., Year, Month, Vessel, La Nifia and E1 Nifio events （ELE）, Latitude, Longitude, Sea surface temperature （SST）, SST anomaly （SSTA）, Nino3.4 index and an interaction term between Longitude and Latitude. The first 5 factors were significant components in the GLM, which in combination explained 27.34% of the total variance in nominal CPUE. In the stepwise GAM, all factors explained 30.78% of the total variance, with Month, Year and Vessel as the main factors influencing CPUE. The higher CPUE occurred during the period April to July at a SST range of 12-15℃ and a SSTA range of 0.2-1.0℃. The CPUE was significantly higher in normal years compared with that in La Nifia and E1 Nifio years. The abundance of Chilean jack mackerel declined during 2001 and 2010, with an increase in 2007. This work provided the relative abundance index of Chilean jack mackerel for stock as- sessment by standardizing catch and effort data of Chinese trawl fisheries and examined the influence of temporal, spatial, environ- mental and fisheries operational factors on Chilean jack mackerel CPUE.展开更多
Rodrigo Riveros has carved out a name for himself as one of the leading international entrepreneurs in Shanghai’s food and beverage industry.Yet,despite his lifelong love for events and food,he once never imagined he...Rodrigo Riveros has carved out a name for himself as one of the leading international entrepreneurs in Shanghai’s food and beverage industry.Yet,despite his lifelong love for events and food,he once never imagined he would one day make them his career.Like many of life’s paths,his journey was shaped by coincidence,luck and persistence—all of which gradually opened the doors to where he stands today.展开更多
The peak sales season for Chilean cherries in China commenced on December 5,highlighted by the arrival of the first Cherry Express vessel for this year’s cherry season at Nansha Port,Guangzhou,capital of Guangdong Pr...The peak sales season for Chilean cherries in China commenced on December 5,highlighted by the arrival of the first Cherry Express vessel for this year’s cherry season at Nansha Port,Guangzhou,capital of Guangdong Province in south China,laden with roughly 370 containers.The event was launched by Frutas de Chile("Fruits from Chile"),the Latin American country's principal fruit export organization.展开更多
A pulsed electric field(PEF:2.0 kV/cm)was applied before vacuum microwave drying(VMD:120 W,120/260 W,and 260 W at 40 kPa)on Chilean abalone mollusks.PEF and VMD effects on process features(drying kinetics,modeling,and...A pulsed electric field(PEF:2.0 kV/cm)was applied before vacuum microwave drying(VMD:120 W,120/260 W,and 260 W at 40 kPa)on Chilean abalone mollusks.PEF and VMD effects on process features(drying kinetics,modeling,and sustainability)and product quality(texture,structure,and digestibility)were measured.The PEF application increased moisture diffusivity by up to 27%in the combined PEF+VMD process.According to the statistical analysis applied to all mathematical models,the Logarithmic model was best fitted to VMD experimental values.In terms of energy consumption,applying PEF+VMD reduced energy consumption by up to 33%of the 120W and 120/260W non-PEF samples.The best values for the rehydration index were obtained with the 120/260W(45%)and PEF+120/260W(61%)treatments.In addition,these samples had the best texture parameters.The PEF+120/260W treatment showed the highest degree of hydrolysis(11%)for the calculated protein efficiency.Finally,using PEF as a pretreatment in a VMD process can be cost-effective for scale replication due to its time efficiency and product quality to Chilean abalone samples.展开更多
Sea-level variation can be induced by periodic tides, stochastic wind, air pressure, and swell. Larger sea-level variation has the potential to cause coastal disasters. In this paper, real-time continuous data obtaine...Sea-level variation can be induced by periodic tides, stochastic wind, air pressure, and swell. Larger sea-level variation has the potential to cause coastal disasters. In this paper, real-time continuous data obtained by the Xiaoqushan seafloor observatory in the East China Sea were analyzed employing frequency power spectral and tidal harmonic methods to extract the major components and periodicities of sea-level change. The sea-level anomaly (sla) was calculated by subtracting the tidal components from the observed sea level data. In the study period, the correlation between sla and the local north-south wind speed was high with a correlation coefficient of 0.65 at the 95% confidence level. The local wind-induced sea-level anomaly (sla wind ) was therefore computed through linear fitting. Although sla wind is one of the main components of sla, the residual sea-level anomaly (sla residual ) obtained by subtracting sla wind from sla is not zero, suggesting that there are other factors besides wind. Detailed analysis of the sea-level data at the time of the 8.8-magnitude Chilean earthquake on February 27, 2010 showed a peak sla residual value of 0.48 m at around 15:00 on February 28, which was highly coincident with the tsunami arrival time forecast by the Pacific Tsunami Warning Center. The peak sla residual event is therefore linked with the tsunami induced by the 2010 Chilean earthquake. This is the first time that a tsunami has been detected using real-time continuous data recorded by a seafloor observatory in the sea off China. Such observations are expected to improve tsunami forecast models and promote the development of a tsunami warning system and a seafloor observatory network in the East China Sea.展开更多
The Chilean Pampean flat slab subduction segment is characterized by the nearly horizontal subduction of the Nazca Plate within the depth range of 100-120 km.Numerous seismic tomography studies have been conducted to ...The Chilean Pampean flat slab subduction segment is characterized by the nearly horizontal subduction of the Nazca Plate within the depth range of 100-120 km.Numerous seismic tomography studies have been conducted to investigate its velocity structure;however,they have used only seismic body wave data or surface wave data.As a result,the existing velocity models in the region may have relatively large uncertainties.In this study,we use body wave arrival times from earthquakes occurring in central Chile between 2014 and 2019,as well as Rayleigh wave phase velocity maps at periods of 5-80 s from ambient noise empirical Green’s functions in Chile.By jointly using body wave arrival times and surface wave dispersion data,we refine the VS model and improve earthquake locations in the central Chile subduction zone.Compared with previous velocity models,our velocity model better reveals an eastward-dipping high-velocity plate representing the subducting Nazca Plate,which is 40-50 km thick and is more consistent with the slab thickness estimated by receiver function imaging and thermal modeling.Overall,the intraslab seismicity distribution spatially correlates well with the slab high-velocity anomalies except along the subduction paths of the CopiapóRidge and Juan Fernández Ridge.Additionally,parallel low-velocity stripes are imaged beneath the subducting plate,which are likely associated with the accumulated melts.The joint inversion velocity model also resolves widespread low-velocity anomalies in the crust beneath the Central Volcanic Zone of the central Andes,likely representing crustal magma chambers for various volcanoes.展开更多
根据中国2001-2009年东南太平洋作业船只提供的捕捞数据和卫星遥感反演的海表温度数据,建立了基于贝叶斯概率理论的智利竹筴鱼渔场预报系统。系统开发采用客户/服务器(C/S)体系模式,数据库则采用SQL Server 2000数据库管理系统,结合控件...根据中国2001-2009年东南太平洋作业船只提供的捕捞数据和卫星遥感反演的海表温度数据,建立了基于贝叶斯概率理论的智利竹筴鱼渔场预报系统。系统开发采用客户/服务器(C/S)体系模式,数据库则采用SQL Server 2000数据库管理系统,结合控件式GIS技术,构建了渔场分析和预报系统,并利用历史数据进行了模型精度验证。结果表明:预报渔场的准确度为72.6%,预报非渔场的准确率为57.5%;综合预报准确率达65%以上。渔汛盛期的渔场预报准确率要高于渔汛末期3%～22%,而非渔场的预报准确率低于渔汛末期4%～11%。因此,该预报系统对于南太平洋智利竹筴鱼渔场预测和捕捞活动具有一定的指导意义。但在实际预报过程中,也需结合其他相关环境因子(如叶绿素a、海面高度、海流等)对预报渔场进行修正。展开更多
根据2001—2007年我国渔船在东南太平洋海域的智利竹筴鱼生产统计数据、时空因子以及海表温度、叶绿素浓度、海表温度梯度等环境数据,利用广义可加模型(GAM)分析了智利竹筴鱼资源变动情况及其与时空和环境因子的关系.结果表明:GAM模型...根据2001—2007年我国渔船在东南太平洋海域的智利竹筴鱼生产统计数据、时空因子以及海表温度、叶绿素浓度、海表温度梯度等环境数据,利用广义可加模型(GAM)分析了智利竹筴鱼资源变动情况及其与时空和环境因子的关系.结果表明:GAM模型对单位捕捞努力量渔获量(catch per unit effort,CPUE)总偏差解释率为31.47%;竹筴鱼生产具有明显的季节变化,主要集中在第17～41周,其中第25～31周的CPUE较高;东南太平洋智利竹筴鱼作业渔场集中在78°—98°W,30°—43.5°S之间,适宜海表温度为12℃～18℃,14℃～16℃最适宜,适宜叶绿素浓度在0.09～0.18mg·m-3,海表温度梯度在0.3℃～1.9℃.逐步建模法结果表明,影响竹筴鱼资源丰度的因子按重要性从大到小依次为周次、年份、海表温度、经度、纬度、叶绿素浓度和海表温度梯度.展开更多
基金Supported by the National Key R&D Program of China(No.2023 YFD 2401303)the Natural Science Foundation of Shanghai(No.23 ZR 1427100)the Shanghai Talent Development Funding(No.2021078)。
文摘As an economically crucial species in the southeast Pacific Ocean,understanding the spatiotemporal distribution changes of the habitat of Trachurus murphyi under the influence of climate change is essential for effective resource assessment and management.The spatiotemporal changes in suitable habitats of T.murphyi under three climate change scenarios(SSP 126,SSP 370,and SSP 585)of Phase 6 of the Coupled Model Intercomparison Project(CMIP 6)were explored based on key environmental factors affecting the potential distribution of the species in a habitat suitability index(HSI)model.Results show that seawater temperature would increase under different scenarios,while the mixed layer depths would decrease under SSP 370 and SSP 585 scenarios but vary slightly under the SSP 126 scenario,which is similar to the variation in different climate periods.The positive difference in seawater temperature will be distributed in the central,southern,and offshore regions of Chile,and the negative difference in mixed layer depths be accounted for a large region.Under different climate scenarios,the HSI value for fishing ground and the overall proportion of suitable habitat area of T.murphyi will be decreased over the forecasted period.The suitable habitat of T.murphyi is concentrated in the 42°S-47°S area and will move to the southwest in different climate periods.Based on short-term climate change,the proportion of suitable habitat areas in the high seas of Chile is larger than in the exclusive economic zone under medium-and long-term climate change under different scenarios.The results of the gravity center of suitable T.murphyi habitat indicates that the spatial distribution of T.murphyi might be related to variations in oceanic currents.These findings provide insights for the effective fisheries resource management of T.murphyi in the Southeast Pacific Ocean.
基金co-funded by the National High Technology Research and Development program of China(No.2012AA092301)the Agriculture Science Technology Achievement Transformation Fund(No.2010C00001)the Project of Fishery Exploration in High Seas of the Ministry of Agriculture of China(2010–2011)
文摘The generalized linear model （GLM） and generalized additive model （GAM） were applied to the standardization of catch per unit effort （CPUE） for Chilean jack mackerel from Chinese factory trawl fishing fleets in the Southeast Pacific Ocean from 2001 to 2010 by removing the operational, environmental, spatial and temporal impacts. A total of 9 factors were selected to build the GLM and GAM, i.e., Year, Month, Vessel, La Nifia and E1 Nifio events （ELE）, Latitude, Longitude, Sea surface temperature （SST）, SST anomaly （SSTA）, Nino3.4 index and an interaction term between Longitude and Latitude. The first 5 factors were significant components in the GLM, which in combination explained 27.34% of the total variance in nominal CPUE. In the stepwise GAM, all factors explained 30.78% of the total variance, with Month, Year and Vessel as the main factors influencing CPUE. The higher CPUE occurred during the period April to July at a SST range of 12-15℃ and a SSTA range of 0.2-1.0℃. The CPUE was significantly higher in normal years compared with that in La Nifia and E1 Nifio years. The abundance of Chilean jack mackerel declined during 2001 and 2010, with an increase in 2007. This work provided the relative abundance index of Chilean jack mackerel for stock as- sessment by standardizing catch and effort data of Chinese trawl fisheries and examined the influence of temporal, spatial, environ- mental and fisheries operational factors on Chilean jack mackerel CPUE.
文摘Rodrigo Riveros has carved out a name for himself as one of the leading international entrepreneurs in Shanghai’s food and beverage industry.Yet,despite his lifelong love for events and food,he once never imagined he would one day make them his career.Like many of life’s paths,his journey was shaped by coincidence,luck and persistence—all of which gradually opened the doors to where he stands today.
文摘The peak sales season for Chilean cherries in China commenced on December 5,highlighted by the arrival of the first Cherry Express vessel for this year’s cherry season at Nansha Port,Guangzhou,capital of Guangdong Province in south China,laden with roughly 370 containers.The event was launched by Frutas de Chile("Fruits from Chile"),the Latin American country's principal fruit export organization.
基金the financial support by the Fondecyt Regular N°1201075 project(ANID-Chile).
文摘A pulsed electric field(PEF:2.0 kV/cm)was applied before vacuum microwave drying(VMD:120 W,120/260 W,and 260 W at 40 kPa)on Chilean abalone mollusks.PEF and VMD effects on process features(drying kinetics,modeling,and sustainability)and product quality(texture,structure,and digestibility)were measured.The PEF application increased moisture diffusivity by up to 27%in the combined PEF+VMD process.According to the statistical analysis applied to all mathematical models,the Logarithmic model was best fitted to VMD experimental values.In terms of energy consumption,applying PEF+VMD reduced energy consumption by up to 33%of the 120W and 120/260W non-PEF samples.The best values for the rehydration index were obtained with the 120/260W(45%)and PEF+120/260W(61%)treatments.In addition,these samples had the best texture parameters.The PEF+120/260W treatment showed the highest degree of hydrolysis(11%)for the calculated protein efficiency.Finally,using PEF as a pretreatment in a VMD process can be cost-effective for scale replication due to its time efficiency and product quality to Chilean abalone samples.
基金supported by Shanghai Committee of Science and Technology (06DZ12012)State Key Lab of Marine Geology (MG200907 and MG200910)+1 种基金Shanghai Municipal Natural Science Foundation (11ZR1438800)the Program for Young Excellent Talents in Tongji University (2009KJ045)
文摘Sea-level variation can be induced by periodic tides, stochastic wind, air pressure, and swell. Larger sea-level variation has the potential to cause coastal disasters. In this paper, real-time continuous data obtained by the Xiaoqushan seafloor observatory in the East China Sea were analyzed employing frequency power spectral and tidal harmonic methods to extract the major components and periodicities of sea-level change. The sea-level anomaly (sla) was calculated by subtracting the tidal components from the observed sea level data. In the study period, the correlation between sla and the local north-south wind speed was high with a correlation coefficient of 0.65 at the 95% confidence level. The local wind-induced sea-level anomaly (sla wind ) was therefore computed through linear fitting. Although sla wind is one of the main components of sla, the residual sea-level anomaly (sla residual ) obtained by subtracting sla wind from sla is not zero, suggesting that there are other factors besides wind. Detailed analysis of the sea-level data at the time of the 8.8-magnitude Chilean earthquake on February 27, 2010 showed a peak sla residual value of 0.48 m at around 15:00 on February 28, which was highly coincident with the tsunami arrival time forecast by the Pacific Tsunami Warning Center. The peak sla residual event is therefore linked with the tsunami induced by the 2010 Chilean earthquake. This is the first time that a tsunami has been detected using real-time continuous data recorded by a seafloor observatory in the sea off China. Such observations are expected to improve tsunami forecast models and promote the development of a tsunami warning system and a seafloor observatory network in the East China Sea.
基金funded by the National Natural Science Foundation of China under Grant 42230101the National Agency for Research and Development of Chile(ANID)by Projects AFB180004 and AFB220002the ANID Programa de Cooperación Internacional(PCI)Grant PII-180003.
文摘The Chilean Pampean flat slab subduction segment is characterized by the nearly horizontal subduction of the Nazca Plate within the depth range of 100-120 km.Numerous seismic tomography studies have been conducted to investigate its velocity structure;however,they have used only seismic body wave data or surface wave data.As a result,the existing velocity models in the region may have relatively large uncertainties.In this study,we use body wave arrival times from earthquakes occurring in central Chile between 2014 and 2019,as well as Rayleigh wave phase velocity maps at periods of 5-80 s from ambient noise empirical Green’s functions in Chile.By jointly using body wave arrival times and surface wave dispersion data,we refine the VS model and improve earthquake locations in the central Chile subduction zone.Compared with previous velocity models,our velocity model better reveals an eastward-dipping high-velocity plate representing the subducting Nazca Plate,which is 40-50 km thick and is more consistent with the slab thickness estimated by receiver function imaging and thermal modeling.Overall,the intraslab seismicity distribution spatially correlates well with the slab high-velocity anomalies except along the subduction paths of the CopiapóRidge and Juan Fernández Ridge.Additionally,parallel low-velocity stripes are imaged beneath the subducting plate,which are likely associated with the accumulated melts.The joint inversion velocity model also resolves widespread low-velocity anomalies in the crust beneath the Central Volcanic Zone of the central Andes,likely representing crustal magma chambers for various volcanoes.
文摘根据中国2001-2009年东南太平洋作业船只提供的捕捞数据和卫星遥感反演的海表温度数据,建立了基于贝叶斯概率理论的智利竹筴鱼渔场预报系统。系统开发采用客户/服务器(C/S)体系模式,数据库则采用SQL Server 2000数据库管理系统,结合控件式GIS技术,构建了渔场分析和预报系统,并利用历史数据进行了模型精度验证。结果表明:预报渔场的准确度为72.6%,预报非渔场的准确率为57.5%;综合预报准确率达65%以上。渔汛盛期的渔场预报准确率要高于渔汛末期3%～22%,而非渔场的预报准确率低于渔汛末期4%～11%。因此,该预报系统对于南太平洋智利竹筴鱼渔场预测和捕捞活动具有一定的指导意义。但在实际预报过程中,也需结合其他相关环境因子(如叶绿素a、海面高度、海流等)对预报渔场进行修正。
文摘根据2001—2007年我国渔船在东南太平洋海域的智利竹筴鱼生产统计数据、时空因子以及海表温度、叶绿素浓度、海表温度梯度等环境数据,利用广义可加模型(GAM)分析了智利竹筴鱼资源变动情况及其与时空和环境因子的关系.结果表明:GAM模型对单位捕捞努力量渔获量(catch per unit effort,CPUE)总偏差解释率为31.47%;竹筴鱼生产具有明显的季节变化,主要集中在第17～41周,其中第25～31周的CPUE较高;东南太平洋智利竹筴鱼作业渔场集中在78°—98°W,30°—43.5°S之间,适宜海表温度为12℃～18℃,14℃～16℃最适宜,适宜叶绿素浓度在0.09～0.18mg·m-3,海表温度梯度在0.3℃～1.9℃.逐步建模法结果表明,影响竹筴鱼资源丰度的因子按重要性从大到小依次为周次、年份、海表温度、经度、纬度、叶绿素浓度和海表温度梯度.
