检索结果-南通市图书馆

Evaluation of the net CO_2 uptake in the canada basin in the summer of 2008

Acta Oceanologica Sinica 2017年第8期36卷 94-100页

作者： SUN Heng GAO Zhongyong LU Peng XIU Peng CHEN Liqi Key Laboratory of Global Change and Marine Atmospheric Chemistry of State Oceanic Administration Third Institute of OceanographyState Oceanic Administration State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of Sciences

The third Chinese National Arctic Research Expedition （CHINARE） was conducted in the summer of 2008. During the survey, the surface seawater partial pressure of CO2 （pCO2） was measured, and sea water samples were collected for CO2 measurement in the canada basin. The distribution of pCO2 in the canada basin was determined, the influencing factors were addressed, and the air-sea CO2 flux in the canada basin was evaluated. The canada basin was divided into three regions： the ice-free zone （south of 77°N）, the partially ice-covered zone （77°-80°N）, and the heavily ice-covered zone （north of 80°N）. In the ice-free zone, pCO2 was high （320 to 368 patm, 1 patm=0.101 325 Pa）, primarily due to rapid equilibration with atmospheric CO2 over a short time. In the partially ice-covered zone, the surface pCOs was relatively low （250 to 270 patm） due to ice-edge blooms and icemelt water dilution. In the heavily ice-covered zone, the seawater pCO2 varied between 270 and 300 laatm due to biological COs removal, the transportation of low pCOs water northward, and heavy ice cover. The surface seawater pCO2 during the survey was undersaturated with respect to the atmosphere in the canada basin, and it was a net sink for atmospheric CO2. The summertime net CO2 uptake of the ice-free zone, the partially ice-covered zone and the heavily ice-covered zone was （4.14±1.08）, （1.79±0.19）, and （0.57±0.03） Tg/a （calculated by carbon, 1 Tg=10^12 g）, respectively. Overall, the net COs sink of the canada basin in the summer of 2008 was （6.5＋1.3） Tg/a, which accounted for 4%-10% of the Arctic Ocean COs sink.

关键词： canada basin net CO2 uptake partial pressure of CO2

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Contrasting patterns of river runoff and sea-ice melted water in the canada basin

引用

Acta Oceanologica Sinica 2014年第6期33卷 46-52页

作者： TONG Jinlu CHEN Min QIU Yusheng LI Yanping CAO Jianping College of Ocean and Earth Sciences Xiamen University State Key Laboratory of Marine Environmental Science Xiamen University

The fractions of river runoff and sea-ice melted water in the canada basin in summer 2003 were determined by the salinity-δ18O system. The fraction of river runoff （fR） was high in the upper 50 m of the water column and decreased with depth and latitude. The signals of the river runoffwere confined to water depths above 200 m. The total amount of river runoff in the canada basin was higher than that in other arctic seas, indicating that the canada basin is a main storage region for river runoff. The penetration depth of the sea-ice melted water was less than 50 m to the south of 78°N, while it was about 150 m to the north of 78°N. The total amount of sea-ice melted water was much higher to the north of 78°N than to the south of 78°N, indicating the sea-ice melted waters accumulated on the ice edge. The abundant sea-ice melted water on the ice edge was attributed to the earlier melted water in the southern canada basin and transported by the Beaufort Gyre or the reinforced melting of sea ice by solar radiation in the polynya.

关键词： freshwater canada basin 18O water mass

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nutrient maximums related to low oxygen concentrations in the southern canada basin

引用

Acta Oceanologica Sinica 2005年第6期24卷 88-96页

作者： JIN Ming-ming SHI Jiuxin LU Yong CHEN Jianfang GAO Guoping WU Jingfeng ZHANG Haisheng Laboratory for Marine Biogeochemistry and Ecosystem State Oceanic Administration Hangzhou 310012 China Laboratory of Ocean Dynamic Processes and Satellite Oceanography State Oceanic Administration Hangzhou 310012 China Laboratory of Marine Science and Numerical Modeling State Oceanic Administration Qingdao 266061 China Laboratory for Marine Biogeochemistry and Ecosystem State Oceanic Administration Hangzhou 310012 China Laboratory of Ocean Dynamic Processes and Satellite Oceanography State Oceanic Administration Hangzhou 310012 China Laboratory for Marine Biogeochemistry and Ecosystem State Oceanic Administration Hangzhou 310012 China College of Physical and Environmental Oceanography Ocean University of China Qingdao 266003 China International Arctic Research Center University of Alaska Fairbanks Fairbanks USA Laboratory for Marine Biogeochemistry and Ecosystem State Oceanic Administration Hangzhou 310012 China

The phenomenon of nutrient maximums at 70～200 m occurred only in the regionof the canada basin among the world oceans. The prevailing hypothesis was that the direct injectionof the low-temperature high-nutrient brines from the Chukchi Sea shelf (canada basin duringthe summer 1999 cruise. We identified the cores of the surface, near-surface, potential temperaturemaximum waters and Arctic Bottom Water by the diagrams and vertical profiles of salinity, potentialtemperature, oxygen and nutrients. The historical ^(129)I data indicated that the surface andnear-surface waters were Pacific-origin, but the waters below the potential temperature maximum coredepth was Atlantic-origin. Along with the correlation of nutrient maximums and very low oxygencontents in the near-surface water, we hypothesize that, the putative organic matter was decomposedto inorganic nutrients; and the Pacific water was mixed with the Atlantic water in the transitionzone. The idea of the regeneration-mixture process agrees with the historical observations of noapparent seasonal changes, the smooth nutrient profiles, the lowest saturation of CaCO_3 above 400m, low rate of CFC-11 ventilation and ~3H-~3He ages of 8～18 a around the nutrient maximum depths.

关键词： nutrient maximum regeneration mixture water mass canada basin

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Variation of freshwater components in the canada basin during 1967–2010

引用

Acta Oceanologica Sinica 2014年第6期33卷 40-45页

作者： PAN Hong CHEN Min TONG Jinlu QIU Yusheng ZHENG Minfang CAO Jianping College of Ocean and Earth Sciences Xiamen University State Key Laboratory of Marine Environmental Science Xiamen University

As a conservative tracer, oxygen isotopes in seawater are widely used for water mass analysis, along with temperature and salinity. In this study, seawater oxygen-18 datasets in the canada basin during 1967-2010 were obtained from the four cruises of the Chinese National Arctic Research Expedition （1999, 2003, 2008, and 2010） and the NASA database. Fractions of sea ice meltwater and river runoffwere determined from the salinity-5180 system. Our results showed that the river runoff decreased from the south to the north in the canada basin. The enhanced amount of river runoff observed in the southern canada basin may originate from the Mackenzie River, transported by the Beaufort Gyre. The river runoff component showed maximum fractions during 1967-1969, 1978-1979, 1984-1985, 1993-1994, and 2008-2010, indicating the refresh time of the river runoffwas 5.0-16.0 a in the canada basin. The temporal variation of the river runoffwas related to the change of the Arctic Oscillation （AO） index, suggesting the freshwater stored in the canada basin was affected by surface sea ice drift and water mass movement driven by atmospheric circulation.

关键词： canada basin freshwater river runoff sea ice meltwater oxygen isotope

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Characterization of the summer pack ice biotic community of canada basin

引用

Acta Oceanologica Sinica 2005年第6期24卷 80-87页

作者： HE Jianfeng CAI Minghong JIANG Xiaodong CHEN Bo YU Yong State Oceanic Administration Key Laboratory for Polar Science Polar Research Institute of ChinaShanghai 200136China

Summer pack ice biotic community of the canada basin was characterized duringthe Second Chinese National Arctic Research Expedition(CHINARE-2003,20 August—5 September 2003).Bacteria,ice algae(diatoms and autotrophic flagellates)and protozoa(mainly heterotrophicflagellates)were observed throughout the whole ice *** vertical distribution of biotic taxavaried among *** integrated biomass ranged from 48.4 and 58.1 mg/m^(2),with an average of55.2 mg/m^(2).Bacteria were the dominant of the assemblage in pack ice,accounted for 84.1%of theintegrated,and ice algae,which usually dominate the ice biotic community,constituted only 3.5%ofthe *** the quick environmental changes of the Arctic Ocean in recent years,wesuggested that quick melting of pack ice in summer was suggested,which caused such change of packice biotic *** low salinity throughout the whole ice column and the continuous melting ofthe pack ice cumbered the formation of ice algae bloom in summer,finally resulting in thedominance of microbial food web with bacteria and heterotrophic flagellates as the most *** the high ratio of pack ice primary production to the total found inprevious studies,the quick change of pack ice community structure in summer would deeply influencethe marine ecosystem of the high Arctic Ocean.

关键词： arctic ocean canada basin pack ice community

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Warming and depth convergence of the Arctic Intermediate Water in the canada basin during 1985–2006

引用

Acta Oceanologica Sinica 2012年第4期31卷 46-54页

作者： LI Shujiang ZHAO Jinping SU Jie CAO Yong Ocean University of China Qingdao 266100 China First Institute of Oceanography State Oceanic Administration Qingdao 266061 China

The warming of the Arctic Intermediate Water （AIW） is studied based on the analyses of hydro- graphic observations in the canada basin of the Arctic Ocean during 1985-2006. It is shown that how the anomalously warm AIW spreads in the canada basin during the observation time through the analysis of the AIW temperature spatial distribution in different periods. The results indicate that by 2006, the entire canada basin has almost been covered by the warming AIW. In order to study interannual variability of the AIW in the canada basin, the canada basin is divided into five regions according to the bottom topography. From the interannual variation of AIW temperature in each region, it is shown that a cooling period follows after the warming event in upstream regions. At the Chukchi Abyssal Plain and Chukchi Plateau, upstream of the Arctic Circumpolar Boundary Current （ACBC） in the canada basin, the AIW temperature reached maximum and then started to fall respectively in 2000 and 2002. However, the AIW in the canada Abyssal Plain and Beaufort Sea continues to warm monotonically until the year 2006. Furthermore, it is revealed that there is convergence of the AIW depth in the five different regions of the canada basin when the AIW warming occurs during observation time. The difference of AIW depth between the five regions of the canada basin is getting smaller and smaller, all approaching 410 m in recent years. The results show that depth convergence is related to the variation of AIW potential density in the canada basin.

关键词： Arctic Intermediate Water canada basin warming interannual variation conver-gence of AIW depth

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A double-halocline structure in the canada basin of the Arctic Ocean

引用

Acta Oceanologica Sinica 2005年第6期24卷 25-35页

作者： SHI Jiuxin ZHAO Jinping LI Shujiang CAO Yong QU Ping First Institute of Oceanography State Oceanic Administration Qingdao 266061 China College of Physical and Environmental Oceanography Ocean University of China Qingdao 266003 China College of Physical and Environmental Oceanography Ocean University of China Qingdao 266003 China College of Physical and Environmental Oceanography Ocean University of China Qingdao 266003 China Shanghai Oceanic Environment Forecast Center State Oceanic Administration Shanghai 200137 China

A year-round halocline is a particular hydrographic structure in the upperArctic Ocean. On the basis of an analysis of the hydrographic data collected in the Arctic Ocean, itis found that a double-halocline structure exists in the upper layer of the southern canada basin,which is absolutely different from the Cold Halocline Layer (CHL) in the Eurasian basin. ThePacific-origin water is the primary factor in the formation of the double-halocline structure. Theupper halocline lies between the summer modification and the winter modification of thePacific-origin water while the lower halocline results from the Pacific-origin water overlying uponthe Atlantic-origin water. Both haloclines are all the year-round although seasonal and interannualvariations have been detected in the historical data.

关键词： halocline, salinity pacific-origin water canada basin arctic ocean

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The Beaufort Gyre variation and its impacts on the canada basin in 2003–2012

引用

Acta Oceanologica Sinica 2015年第7期34卷 19-31页

作者： ZHONG Wenli ZHAO Jinping SHI Jiuxin CAO Yong Key Laboratory of Physical Oceanography Ocean University of China

The Beaufort Gyre （BG） was spun up in the last decade which is an important factor in regulating the variation of the upper ocean. The heat content and freshwater content of the upper ocean increased gradually in the canada basin, as did momentum input. Both the geostrophic wind curl and freshwater content could contribute to the spin-up of BG. However, even though there is no change of the wind field the increasing freshwater alone could result in the spin-up of BG. In this study we show that the Pacific Water is difficult to flow into the central basin as the BG spins up and the maximum temperature of the Pacific Summer Water （PSW） experienced a dramatic decrease inside the BG in 2005 and 2009 due to a change of flow pathway of PSW. The enhancement of Ekman Pumping （EP） contributed to the deepening of the Pacific Winter Water by piling up more freshwater. This change of water column dynamics has also contributed to the deepening ofthe Atlantic Water core after 2007. The EP decreased significantly in 2012 （indicating a spin down of BG） and the direction of Ekman transport turned to the north, which favoured the release of freshwater that had resided in the basin for years.

关键词： Beaufort Gyre Ekman pumping freshwater content geostrophic current canada basin

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Accumulation of freshwater in the permanent ice zone of the canada basin during summer 2008

引用

Acta Oceanologica Sinica 2017年第8期36卷 101-108页

作者： TONG Jinlu CHEN Min1 YANG Weifeng ZHANG Run PAN Hong ZHENG Minfang QIU Yusheng HU Wangjiang ZENG Jian College of Ocean and Earth Sciences Xiamen UniversityXiamen 361102China State Key Laboratory of Marine Environmental Science Xiamen UniversityXiamen 361102China

A combination of 5180 and salinity data was employed to explore the freshwater balance in the canada basin in summer 2008. The Arctic river water and Pacific river water were quantitatively distinguished by using different saline end-members. The fractions of total river water, including the Arctic and Pacific river water, were high in the upper 50 m and decreased with depth as well as increasing latitude. In contrast, the fraction of Pacific river water increased gradually with depth but decreased toward north. The inventory of total river water in the canada basin was higher than other arctic seas, indicating that canada basin was a main storage region for river water in the Arctic Ocean. The fraction of Arctic river water was higher than Pacific river water in the upper 50 m while the opposite was true below 50 m. As a result, the inventories of Pacific river water were higher than those of Arctic river water, demonstrating that the Pacific inflow through the Bering Strait is the main source of freshwater in the canada basin. Both the river water and sea-ice melted water in the permanent ice zone were more abundant than those in the region with sea-ice just melted. The fractions of total river water, Arctic river water, Pacific river water increased northward to the north of 82°N, indicating an additional source of river water in the permanent ice zone of the northern canada basin. A possible reason for the extra river water in the permanent ice zone is the lateral advection of shelf waters by the Trans-Polar Drift. The penetration depth of sea-ice melted waters was less than 30 m in the southern canada basin, while it extended to 125 m in the northern canada basin. The inventory of sea- ice melted water suggested that sea-ice melted waters were also accumulated in the permanent ice zone, attributing to the trap of earlier melted waters in the permanent ice zone via the Beaufort Gyre.

关键词： 18O freshwater river water sea ice melted water canada basin

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Observational analysis of the double-diffusive convection in the deep canada basin

引用

Acta Oceanologica Sinica 2015年第11期34卷 71-79页

作者： XIE Lingling LI Mingming LI Min Guangdong Province Key Laboratory for Coastal Ocean Variation and Disaster Prediction (GLOD) Guangdong Ocean University

The canada basin （CB） is the largest sub-basin in the Arctic, with the deepest abyssal plain of 3 850 m. The double-diffusive process is the possible passage through which the geothermal energy affects the above isolated deep waters. With the temperature-salinity-pressure observations in 2003, 500-m-thick transition layers and lower 1 000-m-thick bottom homogenous layers were found below 2 400 m in the central deep CB. Staircases with downward-increasing temperature and salinity are prominent in the transition layers, suggesting the double- diffusive convection in deep CB. The interface of the stairs is about 10 m thick with 0.001-0.002℃ temperature difference, while the thicknesses of the homogenous layers in the steps decrease upward from about 60 to 20 m. The density ratio in the deep central CB is generally smaller than 2, indicating stronger double-diffusive convection than that in the upper ocean of 200-400 m. The heat flux through the deepest staircases in the deep CB varies between 0.014 and 0.031 W/m2, which is one-two orders smaller than the upper double-diffusive heat flux, but comparable to the estimates of geothermal heat flux.

关键词： double diffusion canada basin staircase heat flux water mass

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：