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Biogeochemical cycles of selenium in Antarctic water 被引量:6
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作者 Xia Weiping (Department of Oceanography, Old Dominion University, Norfolk,VA 23529,USA)Zhang Haishen (Second Institute of Oceanography,SOA,Hangzhou 310012,China)Tan Jianan (Institute of Geography,Chinese Academy of Sciences,Beijing 100101,China) 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 1996年第1期120-126,共7页
Both vertical and horizontal profiles of total dissolved selenium,dissolved organic and inorganic selenium,including Se(IV)and Se(VI),as well as particulate selenium in seawater were obtained on a basis of newly devel... Both vertical and horizontal profiles of total dissolved selenium,dissolved organic and inorganic selenium,including Se(IV)and Se(VI),as well as particulate selenium in seawater were obtained on a basis of newly developed separation technique form Antarctic Ocean,where the prodiction of deep waters occurs.The results exhibited that the concentrations of Se(IV) and Se(VI) were elevated and the total concentration in the surface of the high latitude waters (1. 31 nmol/L) was above those at lower latitudes (1.09 nmol/L) and also that previously reported from the Southern Ocean(1.18 nmol/L,Suzuki,1987).Preliminary investigation using specifically designed microlayer-sampler,that was first employed to identify the main biogeochemical proeesses,revealed Antarctic Ocean being functioning as a potential source as selenium in sea-air exchange. The mean life time of the selenium,detected as Se(IV) in deep water, was also estimated rather shorter than the residence time of the water mass, based on the samples collected from the cruise of China's Sixth Scientific Expedition. 展开更多
关键词 antarctic waters SELENIUM biogeochemical cycle microlayer.
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Freeze Concentration of Proteins in Antarctic Krill Wash Water 被引量:1
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作者 QI Xiangming XU Jing +2 位作者 ZHAO Kuo GUO Hui MA Lei 《Journal of Ocean University of China》 SCIE CAS CSCD 2017年第6期1109-1114,共6页
Water-washing removes fluoride from Antarctic krill but produces large volumes of wash water containing water-soluble proteins and fluoride. The freeze concentration method was tested to determine if it could be used ... Water-washing removes fluoride from Antarctic krill but produces large volumes of wash water containing water-soluble proteins and fluoride. The freeze concentration method was tested to determine if it could be used to recover water-soluble proteins while leaving the fluoride in solution. After freezing and thawing the wash water, protein and fluoride contents of the thawed fractions were determined to explore the melting regularity of components in the wash water. The highest concentration factors of protein and fluoride were obtained after 80 min of thawing, such as 1.48 ± 0.06 and 1.35 ± 0.04 times, respectively. The free amino-nitrogen(FAN) content and sodium dodecyl sulfate-polyacrylamide gel electrophoresis pattern results revealed that the highest concentrations of all ingredients were obtained after 80 min of the process. The degree of hydrolysis of all fractions from the thawing process fluctuated in a narrow range around 12% during the entire process, indicating that the thawing order did not change with various proteins or time during the entire thawing course. These results demonstrate that the freeze concentration method can be used to concentrate protein solutions, even those with fluoride. It was concluded that condensation was achieved and no ingredient could be separated, regardless of fluoride, amino acids, or different proteins in the water. 展开更多
关键词 antarctic KRILL freeze CONCENTRATION WASH water PROTEIN extraction FLUORIDE
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Retrieval of Antarctic sea ice freeboard and thickness from HY-2B satellite altimeter data
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作者 Yizhuo Chen Xiaoping Pang +3 位作者 Qing Ji Zhongnan Yan Zeyu Liang Chenlei Zhang 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2024年第3期87-101,共15页
Antarctic sea ice is an important part of the Earth’s atmospheric system,and satellite remote sensing is an important technology for observing Antarctic sea ice.Whether Chinese Haiyang-2B(HY-2B)satellite altimeter da... Antarctic sea ice is an important part of the Earth’s atmospheric system,and satellite remote sensing is an important technology for observing Antarctic sea ice.Whether Chinese Haiyang-2B(HY-2B)satellite altimeter data could be used to estimate sea ice freeboard and provide alternative Antarctic sea ice thickness information with a high precision and long time series,as other radar altimetry satellites can,needs further investigation.This paper proposed an algorithm to discriminate leads and then retrieve sea ice freeboard and thickness from HY-2B radar altimeter data.We first collected the Moderate-resolution Imaging Spectroradiometer ice surface temperature(IST)product from the National Aeronautics and Space Administration to extract leads from the Antarctic waters and verified their accuracy through Sentinel-1 Synthetic Aperture Radar images.Second,a surface classification decision tree was generated for HY-2B satellite altimeter measurements of the Antarctic waters to extract leads and calculate local sea surface heights.We then estimated the Antarctic sea ice freeboard and thickness based on local sea surface heights and the static equilibrium equation.Finally,the retrieved HY-2B Antarctic sea ice thickness was compared with the CryoSat-2 sea ice thickness and the Antarctic Sea Ice Processes and Climate(ASPeCt)ship-based observed sea ice thickness.The results indicate that our classification decision tree constructed for HY-2B satellite altimeter measurements was reasonable,and the root mean square error of the obtained sea ice thickness compared to the ship measurements was 0.62 m.The proposed sea ice thickness algorithm for the HY-2B radar satellite fills a gap in this application domain for the HY-series satellites and can be a complement to existing Antarctic sea ice thickness products;this algorithm could provide long-time-series and large-scale sea ice thickness data that contribute to research on global climate change. 展开更多
关键词 HY-2B satellite altimeter classification decision tree sea ice freeboard and thickness antarctic waters
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An overview of Antarctic polynyas: sea ice production, forcing mechanisms, temporal variability and water mass formation 被引量:1
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作者 WEI Zheng ZHANG Zhaoru +2 位作者 Timo VIHMA WANG Xiaoqiao CHEN Yuanjie 《Advances in Polar Science》 CSCD 2021年第4期295-311,共17页
Polynyas are irregular open water bodies within the sea ice cover in polar regions under freezing weather conditions.In this study,we reviewed the progress of research work on dynamical forcing,sea ice production(SIP)... Polynyas are irregular open water bodies within the sea ice cover in polar regions under freezing weather conditions.In this study,we reviewed the progress of research work on dynamical forcing,sea ice production(SIP),and water mass formation for both coastal polynyas and open-ocean polynyas in the Southern Ocean,as well as the variability and controlling mechanisms of polynya processes on different time scales.Polynyas play an irreplaceable role in the regulation of global ocean circulation and biological processes in regional ocean ecosystems.The coastal polynyas(latent heat polynyas)are mainly located in the Weddell Sea,the Ross Sea and on the west side of protruding topographic features in East Antarctica.During the formation of coastal polynyas,which are mainly forced by offshore winds or ocean currents,brine rejection triggered by high SIP results in the formation of high salinity shelf water,which is the predecessor of the Antarctic bottom water-the lower limb of the global thermohaline circulation.The open-ocean polynyas(sensible heat polynyas)are mainly found in the Indian sector of the Southern Ocean,which are formed by ocean convection processes generated by topography and negative wind stress curl.The convection processes bring nutrients into the upper ocean,which supports biological production and makes the polynya regions an important sink for atmospheric carbon dioxide.The limitations and challenges in polynya research are also discussed. 展开更多
关键词 antarctic polynyas forcing mechanisms sea ice production water mass formation temporal variability
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Mesoscale characteristics of Antarctic Intermediate Water in the South Pacific
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作者 FENG Ying CHEN Xianyao +1 位作者 WANG Qin YUAN Yeli 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2015年第11期92-101,共10页
The Argo float observations are used to investigate the mesoscale characteristics of the Antarctic Intermediate Water (AAIW) in the South Pacific in this paper. It is shown that a subsurface mesoscale phenomenon is ... The Argo float observations are used to investigate the mesoscale characteristics of the Antarctic Intermediate Water (AAIW) in the South Pacific in this paper. It is shown that a subsurface mesoscale phenomenon is probably touched by an Argo float during the float's ascent-descent cycles and is identified by the horizontal salinity gradient between the vertical temperature-salinity profiles. This shows that the transportation of the AAIW may be accompanied with the rich mesoscale characteristics. To derive the spatial length, time, and propagation characteristics of the mesoscale variability of the AAIW, the gridded temperature-salinity dataset ENACT/ENSEMBLE Version 3 constructed on the in-situ observations in the South Pacific since 2005 is used. The Empirical Mode Decomposition method is applied to decompose the isopycnal-averaged salinity anomaly from 26.8 cr0-27.4 ao, where the AAIW mainly resides, into the basin scale and two mesoscale modes. It is found that the first mesoscale mode with the length scale on the order of 1 000 km explains nearly 50% variability of the mesoscale characteristics of the AAIW. Its westward-propagation speeds are slower in the mid-latitude (around 1 cm/s) and faster in the low latitude (around 6 cm/s), but with an increasing in the latitude band on 25^-30~S. The second mesoscale mode is of the length scale on the order of 500 km, explaining about 30% variability of the mesoscale characteristics of the AAIW. Its westward-propagation speed keeps nearly unchanged (around 0.5 cm/s). These results presented the stronger turbulent motion of the subsurface ocean on the spatial scale, and also described the significant role of Argo program for the better understanding of the deep ocean. 展开更多
关键词 mesoscale characteristics subsurface ocean antarctic Intermediate water (AAIW) ARGO
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Contraction and warming of Antarctic Bottom Water in the Amundsen Sea
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作者 Yu Bai Liang Zhao +1 位作者 Jingen Xiao Shiying Lin 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2022年第4期68-79,共12页
Antarctic Bottom Water(AABW)plays an important role in the meridional overturning circulation and contributes significantly to global heat transport and sea level rise(SLR).Based on the Global Ocean(1/12)°Physica... Antarctic Bottom Water(AABW)plays an important role in the meridional overturning circulation and contributes significantly to global heat transport and sea level rise(SLR).Based on the Global Ocean(1/12)°Physical Reanalysis(GLORYS12V1)products and conductivity-temperature-depth instrument data from the World Ocean Circulation Experiment hydrographic program,we analyzed the trends in the thickness,volume,temperature,salinity,and neutral density of the AABW in the Amundsen Sea from 1993 to 2017.Over the past 25 years,the volume has decreased by 3.45×10^(12) m^(3)/a,thinning at a rate of 5 m/a.In the vertical direction,the contraction of the AABW is compensated by the volume expansion of the Circumpolar Deep Water.As the volume of AABW decreases,the temperature of the AABW increases by about 0.002℃/a.This warming is equivalent to a heat flux of 0.27 W/m^(2).A local SLR is produced due to thermal expansion of 0.35 mm/a.During the study period,the neutral density decreased by 0.0003 kg/(m^(3)·a)due to warming.In the horizontal direction,the volume of AABW flowing from the Ross Sea into the Amundsen Sea gradually decreases and the temperature of the AABW increases continuously.The horizontal transport loss of the AABW volume is 4.07×10^(14) m^(3) and the horizontal heat transport results in a 0.03℃ increase in the temperature of the AABW. 展开更多
关键词 antarctic Bottom water Amundsen Sea thickness VOLUME hydrographic property
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Trace-element ions in snow,ice and water from Antarctic and Arctic with reference of their water vapor chemistry
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作者 刘明星 顾宏堪 《Chinese Journal of Polar Science》 1999年第1期43-46,共4页
The some trace elements in the Antarctic and Arctic snow, ice, water were studied using the methodology and theory of water vapor chemistry. The concentrations of ions Zn 2+ , Cd 2+ , Pb 2+ , Cu 2+ , S... The some trace elements in the Antarctic and Arctic snow, ice, water were studied using the methodology and theory of water vapor chemistry. The concentrations of ions Zn 2+ , Cd 2+ , Pb 2+ , Cu 2+ , Sn 4+ , Bi 3+ in Antarctic and Arctic snow a significant spatial similarity; they are also close to those defined elsewhere on the basic of studies of water vapor chemistry: on average Zn 2+ 5.0 μg/L, Cd 2+ 0.080 μg/L, Pb 2+ 0.030 μg/L, Cu 2+ 0.70 μg/L, Sn 4+ 0.99 μg/L, Bi 3+ 0.18 μg/L. Apparently, the ion concentration in the Antarctic and Arctic region represent natural baseline values and are controlled by natural water cycles. 展开更多
关键词 antarctic and Arctic snow trace element ions water vapor chemistry.
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Pacific-Indian interocean circulation of the Antarctic Intermediate Water around South Australia
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作者 YAO Wenjun SHI Jiuxin 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2017年第7期4-14,共11页
On the basis of the salinity distribution of isopycnal(σ_0=27.2 kg/m^3) surface and in salinity minimum, the Antarctic Intermediate Water(AAIW) around South Australia can be classified into five types correspondi... On the basis of the salinity distribution of isopycnal(σ_0=27.2 kg/m^3) surface and in salinity minimum, the Antarctic Intermediate Water(AAIW) around South Australia can be classified into five types corresponding to five regions by using in situ CTD observations. Type 1 is the Tasman AAIW, which has consistent hydrographic properties in the South Coral Sea and the North Tasman Sea. Type 2 is the Southern Ocean(SO) AAIW, parallel to and extending from the Subantarctic Front with the freshest and coldest AAIW in the study area. Type 3 is a transition between Type 1 and Type 2. The AAIW transforms from fresh to saline with the latitude declining(equatorward). Type 4, the South Australia AAIW, has relatively uniform AAIW properties due to the semienclosed South Australia Basin. Type 5, the Southeast Indian AAIW, progressively becomes more saline through mixing with the subtropical Indian intermediate water from south to north. In addition to the above hydrographic analysis of AAIW, the newest trajectories of Argo(Array for real-time Geostrophic Oceanography) floats were used to constructed the intermediate(1 000 m water depth) current field, which show the major interocean circulation of AAIW in the study area. Finally, a refined schematic of intermediate circulation shows that several currents get together to complete the connection between the Pacific Ocean and the Indian Ocean. They include the South Equatorial Current and the East Australia Current in the Southwest Pacific Ocean, the Tasman Leakage and the Flinders Current in the South Australia Basin, and the extension of Flinders Current in the southeast Indian Ocean. 展开更多
关键词 antarctic Intermediate water Pacific-Indian interocean circulation South Australia World Ocean Circulation Experiment Argo
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Deglacial change of Antarctic Bottom Water in transient simulations
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作者 Chenyu Zhu 《Atmospheric and Oceanic Science Letters》 CSCD 2023年第6期1-7,共7页
本文利用气候瞬变模拟试验TraCE21k分析了末次冰消期南极底层水(Antarctic Bottom Water,AABW)的演变特征及物理机制.TraCE21k的全强迫试验复现了观测记录里现代大西洋AABW相对于冰期时变薄的特征,其强迫敏感性试验进一步指出冰期-现代A... 本文利用气候瞬变模拟试验TraCE21k分析了末次冰消期南极底层水(Antarctic Bottom Water,AABW)的演变特征及物理机制.TraCE21k的全强迫试验复现了观测记录里现代大西洋AABW相对于冰期时变薄的特征,其强迫敏感性试验进一步指出冰期-现代AABW的差异主要由大气温室气体的升高及大陆冰川的退缩二者共同驱动.冰消期气候强迫下海洋和大气温度升高,南大洋海冰逐渐消融,后者直接调控了AABW强度和形态的演变.本文还从绝热翻转环流的观点出发,认为冰消期南大洋的气候变化潜在影响了北大西洋深层水的演变. 展开更多
关键词 南极底层水 冰消期演变 南大洋海冰 瞬变模拟
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Dissolved nutrient distributions in the Antarctic Cosmonaut Sea in austral summer 2021 被引量:2
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作者 HUANG Wenhao YANG Xufeng +2 位作者 ZHAO Jun LI Dong PAN Jianming 《Advances in Polar Science》 CSCD 2022年第3期267-290,共24页
Dissolved nutrients are essential to marine productivity and ecosystem structures in the Southern Ocean.The spatial distributions of dissolved nutrients in the Cosmonaut Sea were studied during the 37th Chinese Nation... Dissolved nutrients are essential to marine productivity and ecosystem structures in the Southern Ocean.The spatial distributions of dissolved nutrients in the Cosmonaut Sea were studied during the 37th Chinese National Antarctic Research Expedition in 2021.The relative standard deviations of the nitrate(NO_(3)-N),nitrite(NO_(2)-N),ammonium(NH_(4)-N),phosphate(PO_(4)-P),and silicate(SiO_(3)-Si)concentrations found in duplicate samples(n=2)were 1.01%,9.04%,6.45%,0.94%,and0.67%,respectively.The mean NO_(3)-N,NO_(2)-N,NH_(4)-N,PO_(4)-P,and SiO_(3)-Si concentrations in the mixed layer were 26.41±4.13,0.15±0.09,0.51±0.22,1.73±0.23,and 41.48±6.94μmol·L^(−1),respectively,and were higher than the relevant limitationconcentrations.The concentrations were generally bounded horizontally by the Southern Boundary(SB)of the Antarctic Circumpolar Current,the NO_(3)-N,NO_(2)-N,NH_(4)-N,and PO_(4)-P concentrations being higher northeast than southwest of the SB but the SiO_(3)-Si concentrations being higher southwest than northeast,indicating that the SB dominates nutrient distributions in themixed layer.The NO_(3)-N,NH_(4)-N,and PO_(4)-P concentrations gradually increased moving vertically down from the mixed layer to 200 m deep and then remained at 33.73±3.51,0.26±0.13,and 2.28±0.10μmol·L^(−1),respectively,to the bottom.The SiO_(3)-Si concentration increased as depth increased and reached a maximum in the bottom layer.The NO_(2)-N concentrationdecreased rapidly as depth increased and was~0μmol·L^(−1)at>150 m deep.Circumpolar Deep Water upwelling may cause high nutrient concentrations in shallower layers up to the 100 m layer between 62.5°S and 64°S. 展开更多
关键词 dissolved nutrients water masses mixed layer CIRCULATION antarctic Cosmonaut Sea
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大洋多金属结核的矿物学特征与南极底流(AABW)活动 被引量:3
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作者 袁良榕 张恩 《矿物学报》 CAS CSCD 北大核心 2018年第5期481-489,共9页
总结了大洋多金属结核的形态、构造类型、矿物组合、区域分布等特征,及其对南极底流活动的反映。采用扫描电镜(SEM)对结核生长过程中构造类型的变化进行连续观察,结合透射电镜(TEM)与X射线粉晶衍射(XRD)分析结果对结核的矿物类型作进一... 总结了大洋多金属结核的形态、构造类型、矿物组合、区域分布等特征,及其对南极底流活动的反映。采用扫描电镜(SEM)对结核生长过程中构造类型的变化进行连续观察,结合透射电镜(TEM)与X射线粉晶衍射(XRD)分析结果对结核的矿物类型作进一步的确定。结果表明,结核的形态、构造类型、矿物组成之间有着很好的响应关系,且受控于南极底流活动强弱的影响,结核形成初期(核心层),南极底流活动强度较强、海水氧化性较高,形成的锰矿物以水羟锰矿为主,构造类型多为斑杂状。结核生长中、后期(外壳层),南极底流活动较弱、海水氧化性较低,形成的锰矿物以钙锰矿为主,其构造类型逐渐过渡为柱状构造及纹层状构造。此外,多金属结核的区域分布及元素变化特征与南极底流活动具有密切联系,南极底流活动区往往对应着多金属结核的大面积分布区,南极底流活动区和非活动区δCe_N和Ce/La值具有明显差别。 展开更多
关键词 多金属结核 矿物学 南极底流(aabw) 大洋环境 深海成矿
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A quasi-synoptic interpretation of water mass distribution and circulation in the western North Pacific:I.Water mass distribution 被引量:6
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作者 谢玲玲 田纪伟 +1 位作者 胡敦欣 王凡 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2009年第3期630-639,共10页
With high-resolution conductivity-temperature-depth (CTD) observations conducted in Oct.-Nov. 2005, this study provides a detailed quasi-synoptic description of the North Pacific Tropic Water (NPTW), North Pacific... With high-resolution conductivity-temperature-depth (CTD) observations conducted in Oct.-Nov. 2005, this study provides a detailed quasi-synoptic description of the North Pacific Tropic Water (NPTW), North Pacific Intermediate Water (NPIW) and Antarctic Intermediate Water (AAIW) in the western North Pacific. Some novel features are found. NPTW enters the western ocean with highest-salinity core off shore at 15°-18°N, and then splits to flow northward and southward along the western boundary. Its salinity decreases and density increases outside the core region. NPIW spreads westward north of 15°N with lowest salinity off shore at 21°N, but mainly hugs the Mindanao coast south of 12°N. It shoals and thins toward the south, with salinity increasing and density decreasing. AAIW extends to higher latitude off shore than that in shore, and it is traced as a salinity minimum to only 10°N at 130°E. Most of the South Pacific waters turn northeastward rather than directly flow northward upon reaching to the Mindanao coast, indicating the eastward shift of the Mindanao Undercurrent (MUC). 展开更多
关键词 North Pacific Intermediate water (NPIW) North Pacific Tropic water (NPTW) antarctic Intermediate water (AAIW)
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The intermediate water in the Philippine Sea 被引量:2
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作者 ZANG Nan WANG Fan SPRINTALL Janet 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2020年第5期1343-1353,共11页
The dimensional and temporal distribution of Antarctic Intermediate Water(AAIW)and North Pacifi c Intermediate Water(NPIW)in the Philippine Sea were explored using Argo profi les and gridded Argo data.As the salinity ... The dimensional and temporal distribution of Antarctic Intermediate Water(AAIW)and North Pacifi c Intermediate Water(NPIW)in the Philippine Sea were explored using Argo profi les and gridded Argo data.As the salinity minimum of intermediate water from mid-high latitude of the southern and northern hemisphere of the Pacifi c Ocean,the properties of AAIW and NPIW merge at about 10°N with diff erent properties in the Philippine Sea.The core of AAIW is located below 600 dbar with potential density of 27≤σθ≤27.3 kg/m 3 and salinity of 34.5≤S≤34.55.The core of NPIW is located between 300–700 dbar with potential density of 26.2≤σθ≤27 kg/m 3 and salinity of 34≤S≤34.4.The volume of AAIW and NPIW during January 2004 to December 2017 is negatively correlated.The time series of AAIW and NPIW is dominated by signifi cant periods of 6 and 8 months,respectively.The variations of AAIW and NPIW are mainly aff ected by volume transport through a 130°E section by the North Equatorial Current(NEC)and North Equatorial Undercurrent(NEUC). 展开更多
关键词 the intermediate water the antarctic Intermediate water the North Pacifi c Intermediate water seasonal variation
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大豆分离蛋白制备南极磷虾油水包油乳液的作用 被引量:1
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作者 吕璐 王紫阳 刘玉佳 《大连工业大学学报》 CAS 2024年第2期102-107,共6页
以不同质量浓度大豆分离蛋白(SPI)为乳化剂,利用高速均质和超声波破碎两步法制备了SPI-南极磷虾油水包油乳液,研究了大豆分离蛋白作为乳化剂的作用。结果表明,当SPI质量浓度从2 mg/mL增加到16 mg/mL时,蛋白溶液的界面张力从50.1 mN/m减... 以不同质量浓度大豆分离蛋白(SPI)为乳化剂,利用高速均质和超声波破碎两步法制备了SPI-南极磷虾油水包油乳液,研究了大豆分离蛋白作为乳化剂的作用。结果表明,当SPI质量浓度从2 mg/mL增加到16 mg/mL时,蛋白溶液的界面张力从50.1 mN/m减小到42.8 mN/m,乳化稳定性从95.3%增加到98.4%,发泡稳定性从70.8%显著降低到41%,粒径范围127.3~146.3 nm,界面蛋白吸附量从47%增加到74%,共聚焦和表观观察发现所有样品分布均匀且稳定。在储存期间,吐温20乳液过氧化值从初始的0.555 mmol/kg上升到1.938 mmol/kg,蛋白质量浓度4 mg/mL的SPI乳液过氧化值从初始的0.665 mmol/kg上升到1.170 mmol/kg,表明SPI具有抑制氧化作用的能力。蛋白质量浓度为4 mg/mL的SPI乳液在40、50、60℃的货架期分别为31.4、30.2和29.2 d。 展开更多
关键词 大豆分离蛋白 南极磷虾油 水包油乳液
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时空团状系数回归模型及其在海洋时空断面数据中的应用
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作者 付昊天 李芙蓉 《中国海洋大学学报(自然科学版)》 CAS CSCD 北大核心 2024年第3期144-152,共9页
为揭示变量间的回归关系在时空域上的变化结构,本文提出了一种新的变系数回归模型——时空团状系数(Spatio-temporally clustered coefficient, STCC)回归模型。STCC模型通过对时空上相邻点的回归系数之差施加惩罚,从而估计出存在时空... 为揭示变量间的回归关系在时空域上的变化结构,本文提出了一种新的变系数回归模型——时空团状系数(Spatio-temporally clustered coefficient, STCC)回归模型。STCC模型通过对时空上相邻点的回归系数之差施加惩罚,从而估计出存在时空变化的回归关系。该模型可在没有先验信息的情况下探索回归关系的时空结构。数值模拟实验表明:STCC模型不仅能有效捕捉回归关系在时空域上的团状结构,对随时空连续变化的回归系数也表现出了较好的估计性能。本文运用STCC模型探索了大西洋25°W断面上的海水温度和盐度之间的回归关系,并据此初步分析了南极中层水的季节性演变特征。 展开更多
关键词 变系数回归 时空团状系数 时空相关 南极中层水 回归模型 回归系数
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Exploring Antarctic subglacial lakes with RECoverable Autonomous Sonde(RECAS):Design and first field tests
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作者 SUN YouHong PAVEL Talalay +31 位作者 LI YuanSheng YU HaiBin WANG DongLiang LI GuoPing XU LiPing GONG Da WANG JiXin WANG JianHua WANG Ting ZHANG Nan WANG ZhiGang CHEN YanJi LIU YunChen LI YaZhou PENG ShiLin SHI JianGuang AN ChunLei GE Qun XU Jing NI XiaoKang CUI QiFeng JIANG Qiang MIKHAIL Sysoev Yang Yang WANG RuSheng WEI XianZhe WANG Yu ZHU TianXin DENG ZhiPeng ALEXEY Markov LI Bing FAN XiaoPeng 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2024年第6期1866-1878,共13页
Conducting scientific drilling on subglacial lakes and obtaining samples of subglacial lake water holds great significance in unraveling the formation and evolution of Antarctic subglacial lakes and early Earth's ... Conducting scientific drilling on subglacial lakes and obtaining samples of subglacial lake water holds great significance in unraveling the formation and evolution of Antarctic subglacial lakes and early Earth's life forms.Despite various approaches to access and directly sample subglacial water and sediments,clean access and exploration of subglacial lakes remain challenging.To address this concern,Jilin University has developed the RECoverable Autonomous Sonde(RECAS)prototype.This technology enables sampling and in-situ detection of subglacial lake water while being isolated from the surface,thus minimizing the risk of pollution.Laboratory tests,including downward and upward drilling,long-running,remote-control,and cold-environment assessments,were conducted to validate the sonde's principle and functionality.During the 38th Chinese National Antarctic Research Expedition,CHINARE(2021–2022 season),the RECAS prototype underwent testing on the flank region of Dalk glacier,10 km from Zhongshan Station in Antarctica.Three boreholes with depths of 200.3,183.2,and 133.5 m were successfully drilled,with the refrozen meltwater sealing the boreholes during the process.Approximately 600 mL of melted water samples were collected from each hole.Throughout the drilling tests,all systems of the RECAS prototype performed within the expected ranges. 展开更多
关键词 subglacial lake thermal drilling water sampling antarctic autonomous sonde
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Variability of Antarctic Intermediate Water south of Australia and its relationship with frontal waves 被引量:1
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作者 ZHANG LinLin YAN XiaoMei +1 位作者 SUN Che HU DunXin 《Science China Earth Sciences》 SCIE EI CAS CSCD 2016年第8期1674-1682,共9页
A streamfunction EOF method is applied to a time series of hydrographic sections in the Southern Ocean south of Australia to study water mass variations. Results show that there are large thermohaline variations north... A streamfunction EOF method is applied to a time series of hydrographic sections in the Southern Ocean south of Australia to study water mass variations. Results show that there are large thermohaline variations north of the Subantarctic Front (SAF) at 300–1500 dbar level, indicating upwelling and downwelling of the Antarctic Intermediate Water (AAIW) along isopycnal surfaces. Based on the latest altimeter product, Absolute Dynamic Topography, a mechanism due to frontal wave propagation is proposed to explain this phenomenon, and an index for frontal waves is defined. When the frontal wave is in positive (negative) phase, the SAF flows northeastward (southeastward) with the fresh AAIW downwelling (upwelling). Such mesoscale processes greatly enhance cross-frontal exchanges of water masses. Spectral analysis shows that frontal waves in the Southern Ocean south of Australia are dominated by a period of about 130 days with a phase speed of 4 cm/s and a wavelength of 450 km. 展开更多
关键词 antarctic Intermediate water(AAIW) Stream-coordinates Frontalwave EOF
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普通X射线荧光光谱法用于中太平洋富钴结壳中锰价态的定量分析 被引量:8
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作者 韩杰 叶瑛 +3 位作者 张孟群 刘笛 张维睿 邬黛黛 《岩矿测试》 CAS CSCD 2007年第2期97-100,104,共5页
应用普通X射线荧光光谱仪,结合PeakFit谱峰处理软件,对不同比例的MnO和MnO_2的人工混合样品的谱峰参数进行了研究,用数学方法将实测的谱峰分解为各个单一的谱峰参数(峰位、峰高、半高宽、子峰积分面积),找出了各个谱峰参数与不同价态锰... 应用普通X射线荧光光谱仪,结合PeakFit谱峰处理软件,对不同比例的MnO和MnO_2的人工混合样品的谱峰参数进行了研究,用数学方法将实测的谱峰分解为各个单一的谱峰参数(峰位、峰高、半高宽、子峰积分面积),找出了各个谱峰参数与不同价态锰含量之间的关系,并据此确定了中太平洋海山区大量富钴结壳样品中Mn^(4+)的相对含量,主要集中在80%~100%。总结了富钴结壳中中层和表层Mn^(4+)的含量高、核心层Mn^(4+)的含量低的变化规律,认为这与该区第四纪以来南极底流活动的增强有关。 展开更多
关键词 X射线荧光光谱法 锰化学价态 富钴结壳 南极底流
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普里兹湾附近绕极深层水和底层水及其运动特征 被引量:26
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作者 蒲书箴 胡筱敏 +2 位作者 董兆乾 于非 陈幸荣 《海洋学报》 CAS CSCD 北大核心 2002年第3期1-8,共8页
利用中国第 1 5次南极科学考察科学考察队的CTD全深度观测资料 ( 1 998年1 1月至 1 999年 2月 ) ,分析并讨论了普里兹湾以北的南大洋海域内 ,绕极深层水(CDW )和南极底层水 (AABW )的物理特性及其空间分布 .同时还与历史上其他学者的发... 利用中国第 1 5次南极科学考察科学考察队的CTD全深度观测资料 ( 1 998年1 1月至 1 999年 2月 ) ,分析并讨论了普里兹湾以北的南大洋海域内 ,绕极深层水(CDW )和南极底层水 (AABW )的物理特性及其空间分布 .同时还与历史上其他学者的发现进行了比较 .指出了在研究海域内 ,CDW在 1 0 0~ 2 0 0 0m之间从北向南扩展 ,其高温核 (t>1 2℃ )和高盐核 (S >34 7)在 75°E断面上最为深厚 ,向南扩展得最远 ;而AABW则在 2 50 0m以深由陆坡底部向北扩展 ,σθ>2 7 875的高密度水体在 70°E断面上最为深厚 ,向北扩展得最远 .此外还通过实测的CTD资料证实了CDW和AABW的经向环流特征 ,以及它们与迪肯流环 (Deaconcell)、亚极地流环和深层流环的一致性 . 展开更多
关键词 普里兹湾 绕极深层水 南极底层水 CDW aabw 空间分布
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2001/2002年夏季南极普里兹湾及其邻近海域的浮游植物 被引量:71
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作者 孙军 刘东艳 +1 位作者 宁修仁 刘诚刚 《海洋与湖沼》 CAS CSCD 北大核心 2003年第5期519-532,共14页
报道了 2 0 0 1 /2 0 0 2年夏季南极普里兹湾邻近海域 3 7个大面测站浮游植物的调查结果。经初步鉴定共有浮游植物 3门 3 7属 86种 ,其中硅藻在种类和细胞丰度上占绝对优势 ,其次为甲藻。主要优势种为克格伦拟脆杆藻 (Fragilariopsisker... 报道了 2 0 0 1 /2 0 0 2年夏季南极普里兹湾邻近海域 3 7个大面测站浮游植物的调查结果。经初步鉴定共有浮游植物 3门 3 7属 86种 ,其中硅藻在种类和细胞丰度上占绝对优势 ,其次为甲藻。主要优势种为克格伦拟脆杆藻 (Fragilariopsiskerguelensis)、细条伪菱形藻 (Pseu do nitzschialineola)、短拟脆杆藻 (Fragilariopsiscurta)和赖氏束盒藻 (Trichotoxonreinboldii)等南极特有种类和常见种类。调查区浮游植物分为两个群集 ,分布在 6 7°S以南的普里兹湾内的群集主要以克格伦拟脆杆藻、短拟脆杆藻、胡克星脐藻 (Asteromphalushookeri)和南极弯角藻 (Eu campiaantarctica)等南极特有种类和常见种类为主 ;分布在 6 7°S以北的大洋海域的群集主要以细条伪菱形藻、赖氏束盒藻、拟膨胀伪菱形藻 (Pseudo nitzschiaturgiduloides)和羽状环毛藻(Corethronpennatum)等南极常见种为主。调查区浮游植物的平均细胞丰度为 (8796± 2 92 85 )ind/L ,细胞多分布于海水的表层 ,密集区分布在 6 7°S以南的普里兹湾内 ,浮游植物的细胞丰度同硝酸盐的浓度密切相关。调查区浮游植物的多样性程度是低的。 展开更多
关键词 南极 普里兹湾 浮游植物 群落结构 细胞丰度 多样性
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