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Phylogenetic diversity of planktonic bacteria in the chukchi borderland region in summer

Acta Oceanologica Sinica 2013年第6期32卷 66-74页

作者： ZENG Yinxin YU Yong LI Huirong HE Jianfeng LEE Sang H SUN Kun Key Laboratory for Polar Science of State Oceanic Administration Polar Research Institute of China College of Biological Engineering Jimei University Department of Oceanography Pusan National University

Planktonic bacteria are abundant in the chukchi borderland region. However, little is known about their di- versity and the roles of various bacteria in the ocean. Seawater samples were collected from two stations K2S and K4S where sea ice was melting obviously. The analysis of water samples with fluorescence in situ hybridization （FISH） showed that DMSP-degrading bacteria accounted for 13% of the total bacteria at the station K2S. No aerobic anoxygenic phototrophic （AAP） bacteria were detected in both samples. The bacterial communities were characterized by two 16S rRNA gene clone libraries. Sequences fell into four major lineages of the domain Bacteria, including Proteobacteria （Alpha, Beta and Gamma subclasses）, Bac- teroidetes, Actinobacteria and Firmicutes. No significant difference was found between the two clone li- braries. SAR11 and Rhodobacteraceae clades of Alphaproteobacteria and Pseudoalteromonas of Gammapro- teobacteria constituted three dominant fractions in the clone libraries. A total of 191 heterotrophic bacterial strains were isolated and 76% showed extracellular proteolytic activity. Phylogenetic analysis reveals that the isolates fell into Gammaproteobacteria, Bacteroidetes, Actinobacteria and Firmicutes. The most common genus in both the bacterial isolates and protease-producing bacteria was Pseudoalteromonas. UniFrac data showed suggestive differences in bacterial communities between the chukchi borderland and the northern Bering Sea.

关键词： diversity planktonic bacteria 16S rRNA gene clone library chukchi borderland

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Turbulent mixing above the Atlantic Water around the chukchi borderland in 2014

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Acta Oceanologica Sinica 2018年第3期37卷 31-41页

作者： ZHONG Wenli GUO Guijun ZHAO Jinping LI Tao WANG Xiaoyu MU Longjiang Key Laboratory of Physical Oceanography Ocean University of China Center for Ocean and Climate Research The First Institute of Oceanography Key Laboratory of Research on Marine Hazards Forecasting National Marine Environmental Forecasting CenterState Oceanic Administration

This study presents an analysis of the CTD data and the turbulent microstructure data collected in 2014, the turbulent mixing environment above the Atlantic Water（AW） around the chukchi borderland region is *** wind becomes more efficient in driving the upper ocean movement along with the rapid decline of sea ice,thus results in a more restless interior of the Arctic Ocean. The turbulent dissipation rate is in the range of4.60×10–10（–3.31×10–9 W/kg with a mean value of 1.33×10–9 W/kg, while the diapycnal diffusivity is in the range of1.45×10–6–1.46×10–5m2/s with a mean value of 4.84×10–6 m2/s in 200–300 m（above the AW）. After investigating on the traditional factors（i.e., wind, topography and tides） that may contribute to the turbulent dissipation rate, the results show that the tidal kinetic energy plays a dominating role in the vertical mixing above the AW. Besides, the swing of the Beaufort Gyre（BG） has an impact on the vertical shear of the geostrophic current and may contribute to the regional difference of turbulent mixing. The parameterized method for the double-diffusive convection flux above the AW is validated by the direct turbulent microstructure results.

关键词： Atlantic Water chukchi borderland turbulent dissipation rate diapycnal diffusive surface stress

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Glacial bedforms in the Northwind Abyssal Plain,chukchi borderland

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Acta Oceanologica Sinica 2021年第5期40卷 114-119页

作者： Zhongyan Shen Tao Zhang Jinyao Gao Chunguo Yang Qingsheng Guan Key Laboratory of Submarine Geosciences Ministry of Natural ResourcesHangzhou 310012China Second Institute of Oceanography Ministry of Natural ResourcesHangzhou 310012China School of Geographic and Oceanographic Sciences Nanjing UniversityNanjing 210023China

A series of sub-parallel linear glacial scours are identified on the crest of the Baoshi Seamount in the Northwind Abyssal Plain by compiling new multibeam data acquired during the 9 th Chinese Arctic Research Expedition(CHINARE-Arc9)in 2018 and previously published *** new data reveal scours that developed at water depths of 850–1030 m with an orientation of about 75°/255°.The maximum water depth occurs in the southernmost scour and is deeper than that from previous investigations,which showed a maximum scouring depth of about 900 m on the *** topographic and geomorphological characteristics suggest that these scours resulted from erosion by the ice shelf extending from the chukchi margin and/or Laurentide Ice Sheet that grounded on the crest of the seamount and moved in a NE–SW *** possibilities of their genesis include armadas of large icebergs/multi-keel icebergs calved from the chukchi Shelf or the Laurentide Ice *** new data provide new constraints for assessing the extent and volume of the ice sheet in the chukchi area during glacial maxima.

关键词： chukchi borderland Northwind Abyssal Plain glacial bedforms mega-scale glacial lineations ice shelf

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北极地区chukchi borderland重磁场及构造特征

北极地区Chukchi Borderland重磁场及构造特征

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作者：李想西安石油大学

学位级别：硕士

chukchi borderland（楚科奇边缘地）位于北冰洋西部,在楚科奇大陆架和加拿大海盆的结合处,是一个南北长约600km、东西宽约400km的水下高地。北极地区油气资源潜力巨大,是未来国内外油气行业发展的重要战略领域,楚科奇边缘地是我国每次... 详细信息

chukchi borderland（楚科奇边缘地）位于北冰洋西部,在楚科奇大陆架和加拿大海盆的结合处,是一个南北长约600km、东西宽约400km的水下高地。北极地区油气资源潜力巨大,是未来国内外油气行业发展的重要战略领域,楚科奇边缘地是我国每次北极考察的必经之地,然而由于气候条件及地理位置的限制,地质资料获取难度较高,前人对其研究程度较低。为了研究楚科奇边缘地的地质构造特征,本文通过对楚科奇边缘地及邻区重磁力数据的系统收集、处理与解释,求取了该区重磁异常滑动平均异常图、垂向二阶导数异常图、变磁化倾角化磁极异常图及总水平导数异常图等转换参数图件。本文结合地质、地震等资料对楚科奇边缘地的重磁场特征进行了综合研究,推测出了楚科奇边缘地的断裂构造特征,划分了构造单元。取得的主要成果和结论有:（1）楚科奇边缘地自由空间重力异常2大特征较明显:异常走向宏观呈NE向及近SN向展布,总体表现为重力高值异常带与重力低值异常带平行分布特征;重力高值与重力低值之间相差较大,多为海槽与海脊的反映,且重力高值与低值之间梯级带比较发育。（2）楚科奇边缘地磁力异常特征非常明显,总体可以分为3个部分:西部梯度变化较陡,呈NE向展布,高值和低值之间梯级带比较发育,西北部发育的NE向展布的磁力异常与研究区西北侧异常特征一致,应是门捷列夫山脊磁异常带的一部分,推测该区域亦属于洋壳;中部及南部梯度变化平缓,主要以磁力负异常为主,仅北风盆地内部有高磁异常带,但分布范围较小;东部及北部主要也是以磁力负异常为主,但是在其边界处两侧异常特征明显不一样,区内的异常幅值较低,梯度变化平缓,区外的异常幅值较高,梯度变化较陡,这种明显的线性过渡带是东部及北部的边界位置。（3）楚科奇边缘地内部构造复杂、断裂发育。断裂主要表现有2个特征:主要断裂主要呈近SN向、近EW向、NW向及NE向展布,规模较大,延伸距离较长,主要控制其与外部的边界;次要断裂主要呈近SN向、NE向及NW向展布,规模相对较小,延伸距离较短,近NW向断裂往往切断近SN向、NE向断裂,主要是控制内部各构造单元的边界。（4）通过对楚科奇边缘地的综合研究,共划分出楚科奇海台、北风盆地、北风复杂构造带和北风脊4个构造单元。

关键词： chukchi borderland 重磁异常特征断裂特征构造单元

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