检索结果-南通市图书馆

Meteorological and sea ice anomalies in the western Arctic Ocean during the 2018-2019 ice season:a Lagrangian study

Advances in Polar Science 2022年第3期33卷 204-219页

作者： lei ruibo ZHANG Fanyi ZHAI Mengxi Key Laboratory of Polar Science MNRPolar Research Institute of ChinaShanghai 200136China Chinese Antarctic Center of Surveying and Mapping Wuhan UniversityWuhan 430079China

Rapid changes in the Arctic climate and those in Arctic sea ice in recent decades are closely coupled.In this study,we used atmospheric reanalysis data and satellite remote sensing products to identify anomalies of meteorological and sea ice conditions during the ice season of 2018-2019 relative to climatological means using a Lagrangian methodology.We obtained the anomalies along the drifting trajectories of eight sea ice mass balance buoys between the marginal ice zone and the pack ice zone in the western Arctic Ocean(~160°W-170°W and 79°N-85°N)from September 2018 toAugust 2019.The temporary collapse of the Beaufort High and a strong positive Arctic Dipole in the winter of 2018-2019 drove the three buoys in the north to drift gradually northeastward and merge into the Transpolar Drift Stream.The most prominent positive temperature anomalies in 2018-2019 along the buoy trajectories relative to 1979-2019 climatology occurred in autumn,early winter,and April,and were concentrated in the southern part of the study area;these anomalies can be partly related to the seasonal and spatial patterns of heat release from the Arctic ice-ocean system to the atmosphere.In the southern part of the study area and in autumn,the sea ice concentration in 2018-2019 was higher than that averaged over the past 10 years.However,we found no ice concentration anomalies for other regions or seasons.The sea ice thickness in the freezing season and the snow depth by the end of the winter of 2018-2019 can also be considered as normal.Although the wind speed in 2018-2019 was slightly lower than that in 1979-2019,the speed of sea ice drift and its ratio to wind speed were significantly higher than the climatology.In 2019,the sea ice surface began to melt at the end of June,which was close to the 1988-2019 climatology.However,spatial variations in the onsets ofsurface melt in 2019 differed from the climatology,and can be explained by the prevalence of a high-pressure system in the south of the Beaufort Sea in June 2019.In addition to seasonal

关键词： sea ice air temperature climate snow motion 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

Arctic summertime anticyclonic circulation mode and its influence on substantial sea ice depletion:a review

引用

Advances in Polar Science 2023年第2期34卷 67-79页

作者： BI Haibo LIANG Xi lei ruibo HU Mengqi WEI Shuo Key laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Geology Laoshan LaboratoryQingdao 266237China Key Laboratory of Marine Hazards Forecasting National Marine Environmental Forecasting CenterMinistry of Natural ResourcesBeijing 100081China Key Laboratory of Polar Science MNRPolar Research Institute of ChinaShanghai 200136China College of Marine Science and Engineering Shandong University of Science and TechnologyQingdao 266590China

The summertime anticyclonic circulation mode(SACM)is related to recent substantial loss of sea ice in the Arctic.This review outlines the potential causes of the SACM and considers its influence on sea ice depletion.Local triggers(i.e.,sea ice loss and sea surface temperature(SST)variation)and spatiotemporal teleconnections(i.e.,extratropical cyclone intrusion,tropical and mid-latitude SST anomalies,and winter atmospheric circulation preconditions)are discussed.The influence of the SACM on the dramatic loss of sea ice is emphasized through inspection of relevant dynamic(i.e.,Ekman drift and export)and thermodynamic(i.e.,moisture content,cloudiness,and associated changes in radiation)mechanisms.Moreover,the motivation for investigation of the underlying physical mechanisms of the SACM in response to the recent substantial sea ice depletionis also clarified through an attempt to better understand the shifting ice-atmosphere interaction in the Arctic during summer.Therecord low extent of sea ice in September 2012 could be reset in the near future if the SACM-like scenario continues to exist during summer in the Arctic troposphere.

关键词： summertime anticyclonic circulation mode sea ice Arctic cyclone

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 uniaxial compressive strength of the Arctic summer sea ice

引用

Acta Oceanologica Sinica 2015年第1期34卷 129-136页

作者： HAN Hongwei LI Zhijun HUANG Wenfeng LU Peng lei ruibo State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology School of Environmental Science and Engineering Chang'an University Polar Research Institute of China State Oceanic Administration

The results on the uniaxial compressive strength of Arctic summer sea ice are presented based on the sam- ples collected during the fifth Chinese National Arctic Research Expedition in 2012 （CHINARE-2012）. Exper- imental studies were carried out at different testing temperatures （-3, -6 and -9℃）, and vertical samples were loaded at stress rates ranging from 0.001 to 1 MPa/s. The temperature, density, and salinity of the ice were measured to calculate the total porosity of the ice. In order to study the effects of the total porosity and the density on the uniaxial compressive strength, the measured strengths for a narrow range of stress rates from 0.01 to 0.03 MPa/s were analyzed. The results show that the uniaxial compressive strength decreases linearly with increasing total porosity, and when the density was lower than 0.86 g/cm3, the uniaxial com- pressive strength increases in a power-law manner with density. The uniaxial compressive behavior of the Arctic summer sea ice is sensitive to the loading rate, and the peak uniaxial compressive strength is reached in the brittle-ductile transition range. The dependence of the strength on the temperature shows that the calculated average strength in the brittle-ductile transition range, which was considered as the peak uniaxial compressive strength, increases steadily in the temperature range from -3 to -9℃.

关键词： Arctic sea ice compressive strength porosity density temperature

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

Aerial observations of sea ice and melt ponds near the North Pole during CHINARE2010

引用

Acta Oceanologica Sinica 2017年第1期36卷 64-72页

作者： LI Lanyu KE Changqing XIE Hongjie lei ruibo TAO Anqi Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology Nanjing University Department of Geological Sciences University of Texas at San Antonio Polar Research Institute of China State Oceanic Administration

An aerial photography has been used to provide validation data on sea ice near the North Pole where most polar orbiting satellites cannot cover. This kind of data can also be used as a supplement for missing data and for reducing the uncertainty of data interpolation. The aerial photos are analyzed near the North Pole collected during the Chinese national arctic research expedition in the summer of 2010（CHINARE2010）. The result shows that the average fraction of open water increases from the ice camp at approximately 87°N to the North Pole, resulting in the decrease in the sea ice. The average sea ice concentration is only 62.0% for the two flights（16 and 19 August 2010）. The average albedo（0.42） estimated from the area ratios among snow-covered ice,melt pond and water is slightly lower than the 0.49 of HOTRAX 2005. The data on 19 August 2010 shows that the albedo decreases from the ice camp at approximately 87°N to the North Pole, primarily due to the decrease in the fraction of snow-covered ice and the increase in fractions of melt-pond and open-water. The ice concentration from the aerial photos and AMSR-E（The Advanced Microwave Scanning Radiometer-Earth Observing System） images at 87.0°–87.5°N exhibits similar spatial patterns, although the AMSR-E concentration is approximately 18.0%（on average） higher than aerial photos. This can be attributed to the 6.25 km resolution of AMSR-E, which cannot separate melt ponds/submerged ice from ice and cannot detect the small leads between floes. Thus, the aerial photos would play an important role in providing high-resolution independent estimates of the ice concentration and the fraction of melt pond cover to validate and/or supplement space-borne remote sensing products near the North Pole.

关键词： sea ice melt pond albedo concentration aerial observation North Pole

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

Crucial physical characteristics of sea ice in the Arctic section of 143°–180°W during August and early September 2008

引用

Acta Oceanologica Sinica 2012年第4期31卷 65-75页

作者： lei ruibo LI Zhijun LI Na LU Peng CHENG Bin Polar Research Institute of China State Oceanic AdministrationShanghai 200136China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China Finnish Meteorological Institute P.O.Box 503Helsinki FI-00101Finland

Sea-ice physical characteristics were investigated in the Arctic section of 143^-180~W during Au- gust and early September 2008. Ship-based observations show that both the sea-ice thickness and concentration recorded during southward navigation from 30 August to 6 September were remark- ably less than those recorded during northward navigation from 3 to 30 August, especially at low latitudes. Accordingly, the marginal ice zone moved from about 74.0~N to about 79.5~N from mid-August to early September. Melt-pond coverage increased with increasing latitude~ peaking at 84.4~N, where about 27% of ice was covered by melt ponds. Above this latitude, melt-pond coverage decreased evidently as the ice at high latitudes experienced a relatively short melt season and commenced its growth stage by the end of August. Regional mean ice thickness increased from 0.8 （~=0.5） m at 75.0~N to 1.5 （＋0.4） m at 85.0~N along the northward navigation while it decreased rapidly to 0.6 （-t-0.3） m at 78.0~N along the southward navigation. Because of relatively low ice concentration and thin ice in the investigated Arctic sector, both the short-term ice stations and ice camp could only be set up over multiyear sea ice. Observations of ice properties based on ice cores collected at the short-term ice stations and the ice camp show that all investigated floes were essentially isothermal with high temperature and porosity, and low density and salinity. Most ices had salinity below 2 and mean density of 800-860 kg/m3. Significant ice loss in the investigated Arctic sector during the last 15 a can be identified by comparison with the previous observations.

关键词： sea ice thickness concentration ice core 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

Features of sea ice motion observed with ice buoys from the central Arctic Ocean to Fram Strait

引用

Advances in Polar Science 2020年第1期31卷 26-35页

作者： HAN Hongwei lei ruibo LU Peng LI Zhijun School of Water Conservancy and Civil Engineering Northeast Agricultural UniversityHarbin 150030China MNR Key Laboratory for Polar Science Polar Research Institute of ChinaShanghai 200136China Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China

Using six ice-tethered buoys deployed in 2012,we analyzed sea ice motion in the central Arctic Ocean and Fram Strait.The two-hourly buoy-derived ice velocities had a magnitude range of 0.010.80 m s 1,although ice velocities within the Arctic Basin were generally less than 0.4 m s 1.Complex Fourier transformation showed that the amplitudes of the sea ice velocities had a non-symmetric inertial oscillation.These inertial oscillations were characterized by a strong peak at a frequency of approximately 2 cycle d 1 on the Fourier velocity spectrum.Wind was a main driving force for ice motion,characterized by a linear relationship between ice velocity and 10-m wind speed.Typically,the ice velocity was about 1.4%of the 10-m wind speed.Our analysis of ice velocity and skin temperature showed that ice velocity increased by nearly 2%with each 10℃increase in skin temperature.This was likely related to weakened ice strength under increasing temperature.The ice-wind turning angle was also correlated with 10-m wind speed and skin temperature.When the wind speed was less than 12 m s 1 or skin temperature was less than 30℃,the ice-wind turning angle decreased with either increasing wind speed or skin temperature.Clearly,sea ice drift in the central Arctic Ocean and Fram Strait is dependent upon seasonal changes in both temperature and wind speed.

关键词： Arctic sea ice velocity inertial oscillation wind skin temperature

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 physical structures of snow and sea ice in the Arctic section of 150°-180°W during the summer of 2010

引用

Acta Oceanologica Sinica 2013年第5期32卷 57-67页

作者： HUANG Wenfeng lei ruibo ILKKA Matero LI Qun WANG Yongxue LI Zhijun State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Polar Research Institute of China State Oceanic Administration Department of Physics University of Helsinki

The physical structures of snow and sea ice in the Arctic section of 150°-180°W were observed on the basis of snow-pit, ice-core, and drill-hole measurements from late July to late August 2010. Almost all the in- vestigated floes were first-year ice, except for one located north of Alaska, which was probably multi-year ice transported from north of the Canadian Arctic Archipelago during early summer. The snow covers over all the investigated floes were in the melting phase, with temperatures approaching 0℃and densities of 295-398 kg/m3. The snow covers can be divided into two to five layers of different textures, with most cases having a top layer of fresh snow, a round-grain layer in the middle, and slush and/or thin icing layers at the bottom. The first-year sea ice contained about 7%-17% granular ice at the top. There was no granular ice in the lower layers. The interior melting and desalination of sea ice introduced strong stratifications of temper- ature, salinity, density, and gas and brine volume fractions. The sea ice temperature exhibited linear cooling with depth, while the salinity and the density increased linearly with normalized depth from 0.2 to 0.9 and from 0 to 0.65, respectively. The top layer, especially the freeboard layer, had the lowest salinity and density, and consequently the largest gas content and the smallest brine content. Both the salinity and density in the ice basal layer were highly scattered due to large differences in ice porosity among the samples. The bulk average sea ice temperature, salinity, density, and gas and brine volume fractions were -0.8℃, 1.8, 837 kg/m3, 9.3% and 10.4%, respectively. The snow cover, sea ice bottom, and sea ice interior show evidences of melting during mid-August in the investigated floe located at about 87°N, 175°W.

关键词： sea ice snow thickness salinity temperature density 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

基于哨兵1号影像浮冰形状特征的北极内尔斯海峡海冰运动信息提取方法

引用

极地研究 2024年第2期36卷 169-182页

作者：杨帆刘婷婷雷瑞波武汉大学中国南极测绘研究中心湖北武汉430072 极地环境监测与公共治理教育部重点实验室湖北武汉430072 自然资源部极地科学重点实验室中国极地研究中心(中国极地研究所)上海200136

内尔斯海峡是北极海冰输出的重要通道之一,从海峡流出的海冰对巴芬湾、拉布拉多海深层水的形成以及北极海冰物质平衡具有重要影响。由于海峡入口狭窄和海冰密集度较低,现有海冰运动反演算法较难从卫星影像上获取有效的海冰运动信息,从... 详细信息

内尔斯海峡是北极海冰输出的重要通道之一,从海峡流出的海冰对巴芬湾、拉布拉多海深层水的形成以及北极海冰物质平衡具有重要影响。由于海峡入口狭窄和海冰密集度较低,现有海冰运动反演算法较难从卫星影像上获取有效的海冰运动信息,从而限制了该区域海冰运动信息的提取。本研究提出了一种基于浮冰形状特征的海冰运动提取算法,该算法主要包括影像分割、浮冰提取和浮冰匹配3个步骤。使用该算法从2019年2月20-27日逐日哨兵1号影像中提取了内尔斯海峡的海冰运动信息,并结合人工制作的验证数据评估了该算法在浮冰提取和匹配过程的精度。结果显示该算法提取的浮冰形状参数平均误差为4.3%~8.48%、浮冰运动矢量的总体正确率为84%、浮冰质心与运动速度的均方根误差分别为0.171km和6.313cm·s^(–1)。对比SIFT,ORB和AKAZE三种基于特征追踪的海冰运动反演算法,该算法结果中海冰运动覆盖面积增加了27.7%,精度提高约39%。该算法不仅有效地提取了内尔斯海峡海冰运动信息,而且可为其他区域(如海冰边缘区)的海冰运动信息提取提供参考。

关键词：内尔斯海峡海冰运动哨兵1号影像分割浮冰匹配

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

Physics of Arctic landfast sea ice and implications on the cryosphere: an overview

引用

Advances in Polar Science 2021年第4期32卷 281-294页

作者： ZHAI Mengxi Matti LEPPÄRANTA Bin CHENG lei ruibo ZHANG Fanyi Key Laboratory of Polar Science MNRPolar Research Institute of ChinaShanghai 200136China University of Helsinki Helsinki Fi-00014Finland Finnish Meteorological Institute Helsinki Fi-00101Finland

Landfast sea ice(LFSI)is a criticalcomponent of the Arctic sea ice cover,and is changing as a result of Arctic amplification of climate change.Located in coastal areas,LFSI is of great significance to the physical and ecological systems of the Arctic shelf and in local indigenous communities.We present an overview of the physics of Arctic LFSI and the associated implications on the cryosphere.LFSI is kept in place by four fastenmechanisms.The evolution of LFSI is mostly determined by thermodynamic processes,and can therefore be usedas an indicator of local climate change.We also present the dynamic processes that are active prior to the formation of LFSI,and those that are involved in LFSI freeze-up and breakup.Season length,thickness and extent of Arctic LFSI are decreasing andshowing different trends in different seas,and therefore,causing environmental and climatic impacts.An improved coordination of Arctic LFSI observation is needed with a unified and systematic observation network supported by cooperation between scientists and indigenous communities,as well as a better application of remote sensing data to acquire detailed LFSI cryosphere physical parameters,hence revolving both its annual cycle and long-term changes.Integrated investigations combining in situ measurements,satellite remote sensing and numerical modeling are needed to improve our understanding of the physical mechanisms of LFSI seasonal changes and their impacts on the environment and climate.

关键词： landfast sea ice Arctic Ocean remote sensing mass balance

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

An outstanding example of cooperation between Arctic and non-Arctic countries in cryosphere and climate research: Sino-Finnish cooperation for more than 30 years

引用

Advances in Polar Science 2021年第4期32卷 261-263页

作者： Matti LEPPÄRANTA Timo VIHMA Bin CHENG lei ruibo University of Helsinki Helsinki Fi-00014Finland Finnish Meteorological Institute Helsinki Fi-00101Finland Key Laboratory of Polar Science MNRPolar Research Institute of ChinaShanghai 200136China

The cryosphere is interconnected with other components of the climate system through global exchange of water,energy,and carbon.Long-term sustainable and pragmatic scientific and technological cooperation on the cryosphere and climatology in polar and sub-polar regions between China and Finland began in the 1980s.The fields of bilateral cooperation include joint training of young scientists,joint field observations,climatological and ecological researches of polar and sub-polar sea ice,glaciers and frozen lakes,etc.The year 2020 marked the 70th anniversary of the establishment of diplomatic relations between China and Finland.In order to celebrate the great achievements by Chinese and Finnish scientists in the fieldsof cryosphere and climate research,the Advances in Polar Science invited scientists from both sides to jointly organize a Special Issue entitled“Sino-Finnish cooperation on cryosphere and climatology in polar and sub-polar regions”.In this Special Issue,we have collected 10 papers,with most papers created jointly by scientists of both sides.The fruitful scientific achievement is strongly benefited from the sustainability of cooperation.Monitoring,research,prediction,mitigation,and adaptation to the climate change in the polar and sub-polar regions will definitively stay in the focus for many decades to come.A new era of Finnish-Chinese scientific collaboration on cryosphere has begun.

关键词： China Finland international cooperation cryosphere climate polar region sub-polar region

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：