共查询到20条相似文献，搜索用时 421 毫秒
1.
中沙群岛主要由中沙大环礁和黄岩岛组成,其温盐分布对于本区渔业生产、航海保障和水下通讯等具有重要意义。尤其是春夏之交的季节转换时期,该海域水温和盐度及其相应的跃层特性存在显著的季节变化,掌握其季节变化特征具有重要现实意义。本文基于2019年5月（南海春夏季风转换期）中沙大环礁、黄岩岛和2020年6月（夏季风爆发期）中沙大环礁海域大面站调查数据分析,发现中沙大环礁海域水温和盐度分布特征在夏季风爆发前后具有显著的差异性,2个航次的温跃层分布也呈现出较大不同,2019年5月黄岩岛海域温盐中上层分布与中沙大环礁相似,但底层有所差异,跃层深度也较大。2020年6月中沙大环礁内水体升温较快,各层水温均高于2019年5月,其中以底层水体升温最为显著;2019年5月中沙大环礁内水温水平梯度较大,且随着水深加大水平梯度也越大,2020年6日水平温度梯度逐渐减小。2个航次的盐度分布与水温分布较为相似。结合调查时段的海表热通量变化和卫星高度计资料分析认为,2019年5月中沙大环礁西南部海洋吸热高于东北部,故表层水温西南高东北低;2020年6月至7月环礁西南部海洋吸热低于东北部,故表层水温西南低东北高。由于中尺度涡的作用,中沙大环礁区域局部产生低温高盐或高温低盐水,并导致2020年6月中沙大环礁大部分海域的温跃层加深。 相似文献
2.
Romanova N. D. Mosharov S. A. Vorobieva O. V. Bardyukova E. V. Artemiev V. A. 《Oceanology》2022,62(2):185-197
Oceanology - The spatial distribution of the main parameters of primary productivity is described for the northern part of the Weddell Sea in the Antarctic summer of 2020. The integral... 相似文献
3.
对赤潮灾害时间序列的特征分析是进行赤潮灾害防灾减灾工作的基础,对未来赤潮灾害的预测具有重要意义。通过观察发现中国沿海赤潮灾害年发生频次和分布面积的时间序列(2004—2019年)均呈现出趋势项和周期项并存的特征,因此利用灰色-周期外延组合预测模型对两个序列中的趋势项和周期项进行提取,模型的拟合度分别达到95.20%和95.24%,优于灰色模型、Fourier级数扩展模型和Holt-Winter指数平滑模型等。最后将该模型结果应用到对未来中国赤潮灾害的预测中,得到结论:2020和2021年赤潮灾害发生频次分别为39次和42次,与2019年相比略有上升,2020年赤潮灾害分布面积达到3 168 km2,与2019年相比增加了约59%,而2021年赤潮灾害分布面积出现回落,为1 901 km2。 相似文献
4.
Oceanology - The article presents the results of investigations conducted by members of SSC RAS on the Dolgaya Spit in 2019–2020. The following types of data are analyzed: satellite imagery,... 相似文献
5.
Ulyantsev A. S. Charkin A. N. Syomin V. L. Kireenko L. A. Botsul S. A. Leusov A. E. Semkin P. Yu. Kukla S. P. 《Oceanology》2021,61(4):584-585
Oceanology - The paper provides information about a complex of geological studies in Chaun Bay in the East Siberian Sea during cruise 60 of the R/V Akademik Oparin in October 2020. Preliminary... 相似文献
6.
Izvestiya, Atmospheric and Oceanic Physics - We consider some characteristics of seismicity in the region of Southwest Alaska. The aftershock zones of the Simeonof (July 22, 2020,... 相似文献
7.
Drits A. V. Kravchishina M. D. Sukhanova I. N. Belyaev N. A. Karmanov V. A. Flint M. V. 《Oceanology》2021,61(6):984-993
Oceanology - Sedimentation rates in the northern Kara Sea between September 2019 and July 2020 were calculated from integrated monthly values for sedimentary matter, organic carbon, nitrogen, total... 相似文献
8.
确定自然海岸特征是海岸修复中的重要内容,但是在开发后弃管的无居民海岛却面临缺少历史资料参考的困难。在大连普兰店湾中部前大连岛的研究证明,依据历史影像和现存海岸地质地貌情况可以分析确定原自然海岸位置及性质。1972年KH 卫星影像表明当时的前大连岛仍然保持自然海岸形态,海岸位置在2020年海岸后
方的岛屿陆域内部。结合2020年海岸地质考察结果可以进一步确定1972年的前大连岛东部、西部分布海蚀崖形式的基岩海岸,南部、北部则分布砾石质海岸。1972—2020年,前大连岛自然海岸全部变化为人工海岸,海岸长度也从约2.38 km 增加至约3.12 km。 相似文献
9.
Izvestiya, Atmospheric and Oceanic Physics - Seasonal differences in the Moscow urban heat-island intensity (UHII) have been studied in detail based on data obtained in 2018–2020 by the... 相似文献
10.
利用中央气象台台风实时业务定位资料和地面气象观测资料对2020年西北太平洋和南海的台风活动主要特征以及主要影响我国的台风路径、强度及风雨情况进行了统计分析。2020年西北太平洋和南海共有23个台风生成,较多年平均值(27.0个)偏少4.0个;有5个台风登陆我国,较多年平均值(7.0个)偏少2.0个。2020年台风活动的主要特征有:台风生成源地明显偏西;生成总数偏少,极值强度偏弱;7月“空台”,是1949年以来历史首次;8月台风活跃,出现多个近海快速增强的台风;8月下旬至9月上旬,3个台风连续北上影响我国东北地区,历史罕见;10月生成的台风个数较常年偏多,先后影响我国南海或中南半岛。 相似文献
11.
Ulyanova M. O. Sivkov V. V. Bashyrova L. D. Krek A. V. Bubnova E. S. Dorokhov D. V. Dorokhova E. V. Krechik V. A. 《Oceanology》2022,62(1):136-138
Oceanology - During the 56th cruise of the P/V Akademik Ioffe (August 2020) in the Baltic Sea, hypoxia was registered at a water depth of 80 m, hydrogen sulfide in the East Gotland Basin was... 相似文献
12.
Gubanova D. P. Vinogradova A. A. Iordanskii M. A. Skorokhod A. I. 《Izvestiya Atmospheric and Oceanic Physics》2021,57(3):297-309
Izvestiya, Atmospheric and Oceanic Physics - The results of an intensive complex experiment carried out from March 25 to May 3, 2020, to study the composition and time variability of urban aerosol... 相似文献
13.
Lepikhina P. P. Basin A. B. Kondar D. V. Udalov A. A. Chikina M. V. Mokievsky V. O. 《Oceanology》2022,62(2):198-206
Oceanology - Macro- and meiobenthos of the Blagopoluchiya Bay (Novaya Zemlya, Kara Sea) have undergone significant changes in their quantitative distribution from 2013 to 2020. During this period,... 相似文献
14.
Dymnikov V. P. Tyrtyshnikov E. E. Lykossov V. N. Zalesny V. B. 《Izvestiya Atmospheric and Oceanic Physics》2020,56(3):215-217
Izvestiya, Atmospheric and Oceanic Physics - Introductory article on the issue of the journal Izvestiya RAN, Atmospheric and Oceanic Physics, 2020, vol. 56, no. 3 dedicated to the 40th anniversary... 相似文献
15.
The macroalgal blooms of floating brown algae Sargassum horneri are increasing in the Yellow Sea and East China Sea during the past few years. However, the annual pattern of Sargassum bloom is not well characterized. To study the developing pattern and explore the impacts from hydro-meteorologic environment, high resolution satellite imageries were used to monitor the distribution, coverage and drifting of the pelagic Sargassum rafts in the Yellow Sea and East China Sea from September 2019 to Au... 相似文献
16.
Izvestiya, Atmospheric and Oceanic Physics - In the winter–spring period of 2020, the unprecedented destruction of stratospheric ozone over the Arctic (in terms of duration and depth) was... 相似文献
17.
长棘海星(Acanthaster planci)作为珊瑚的天敌之一，因其对珊瑚礁生态系统的灾难性破坏而备受关注。然而，长棘海星在南海珊瑚礁生态系统中的时空分布特征仍不清楚。本研究于2020年9月、2021年4月和2022年1月对西沙群岛礁区表层海水进行取样，借助环境DNA(environmental DNA)和实时荧光定量PCR技术分析了表层海水中长棘海星线粒体细胞色素-c-氧化酶亚基I(COTS-mtCOI)基因片段浓度的时空变化，及其与海水温度、盐度、pH、叶绿素含量和营养盐含量等环境因子的相关性。结果发现，2020-2022年，西沙礁区COTS-mtCOI片段浓度的变化范围为0～4.13×107拷贝数/m3，且永乐环礁附近一直有较高的COTS-mtCOI片段浓度。对于华光礁、晋卿岛、羚羊礁、全富岛和赵述岛而言，2020年9月表层海水中COTS-mtCOI片段的平均浓度显著高于2021年4月和2022年1月(p<0.05)。此外，COTS-mtCOI片段浓度与表层海水的温度显著正相关(p<0.05)。研究结果表明，当前长棘海星... 相似文献
18.
Based on long-term tide gauge observations in the last 60 years, the temporal and spatial variation characteristics of sea level change along the coast of China are analyzed. The results indicate that the sea level along the coast of China has been rising at an increasing rate, with an estimated acceleration of 0.07 mm/a2. The rise rates were 2.4 mm/a, 3.4 mm/a and 3.9 mm/a during 1960–2020, 1980–2020 and 1993–2020, respectively. In the last 40 years, the coastal sea level has risen fastest in the South China Sea and slowest in the Yellow Sea. Seasonal sea levels all show an upward trend but rise faster in winter and spring and slower in autumn. Sea level change along the coast of China has significant periodic oscillations of quasi-2 a, 4 a, 7 a, 11 a, quasi-19 a and 30–50 a, among which the 2–3 a, 11 a, and 30–50 a signals are most remarkable, and the amplitude is approximately 1–2 cm. The coastal sea level in the most recent decade reached its highest value in the last 60 years. The decadal sea level from 2010 to 2019 was approximately 133 mm higher than the average of 1960–1969. Empirical orthogonal function analysis indicates that China’s coastal sea level has been changing in a north-south anti-phase pattern, with Pingtan and Fujian as the demarcation areas. This difference was especially obvious during 1980–1983, 1995–1997 and 2011–2013. The coastal sea level was the highest in 2016, and this extreme sea level event was analyzed to be related mainly to the anomalous wind field and ENSO. 相似文献
19.
Izvestiya, Atmospheric and Oceanic Physics - Data are presented on the rate of ozone depletion in the catalytic cycles of Ox, HOx, NOx, ClOx, and BrOx in the mesosphere in January and June 2020, as... 相似文献
20.
黄鳍金枪鱼(Thunnus albacares)是全球经济和生态价值最重要的鱼类之一，其资源养护和管理受到各方的高度关注。本文依据年龄结构产量模型研究了印度洋黄鳍金枪鱼的资源状态，着重探讨了其生活史特征的不确定性对资源评估结果的影响。研究结果显示，1960-1985年间印度洋黄鳍金枪鱼资源量保持相对稳定，之后开始逐渐下降，相应的捕捞死亡系数也在2010年之后迅速增加，目前其种群可能存在过度捕捞(F2020/FMSY>1,SSB2020/SSBMSY<1)。印度洋黄鳍金枪鱼的资源评估结果对自然死亡系数(M)和亲体-补充量关系陡度参数(h)的改变较为敏感。当h增大时，SSBMSY和初始SSB(即SSB0)的变化较大，分别减少了约25.53万t和34.04万t;F2020/FMSY减小了1.15。当M增大时，F2020/FMSY、SSBMSY... 相似文献