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1.
Recent observations and modeling study about sea fog over the Yellow Sea and East China Sea 总被引：1，自引：0，他引：1
ZHANG Suping 《中国海洋大学学报(英文版)》2012,11(4):465-472
This review presents some of the latest achievements in sea fog research,including fog climatology,fog structure in the marine atmospheric boundary layer,and numerical simulations and forecasting of fog.With the development of atmospheric observational techniques and equipments,new facts about sea fog are revealed.The mechanisms involved in the formation,development and dissipation of sea fog are further explored with the help of advanced atmospheric models. 相似文献
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In this paper,a Bayesian sea ice detection algorithm is first used based on the HY-2A/SCAT data,and a backpropagation(BP)neural network is used to classify the Arctic sea ice type.During the implementation of the Bayesian sea ice detection algorithm,linear sea ice model parameters and the backscatter variance suitable for HY-2A/SCAT were proposed.The sea ice extent obtained by the Bayesian sea ice detection algorithm was projected on a 12.5 km grid sea ice map and validated by the Advanced Microwave Scanning Radiometer 2(AMSR2)15%sea ice concentration data.The sea ice extent obtained by the Bayesian sea ice detection al-gorithm was found to be in good agreement with that of the AMSR2 during the ice growth season.Meanwhile,the Bayesian sea ice detection algorithm gave a wider ice edge than the AMSR2 during the ice melting season.For the sea ice type classification,the BP neural network was used to classify the Arctic sea ice type(multi-year and first-year ice)from January to May and October to De-cember in 2014.Comparison results between the HY-2A/SCAT sea ice type and Equal-Area Scalable Earth Grid(EASE-Grid)sea ice age data showed that the HY-2A/SCAT multi-year ice extent variation had the same trend as the EASE-Grid data.Classification errors,defined as the ratio of the mismatched sea ice type points between HY-2A/SCAT and EASE-Grid to the total sea ice points,were less than 12%,and the average classification error was 8.6%for the study period,which indicated that the BP neural network classification was a feasible algorithm for HY-2A/SCAT sea ice type classification. 相似文献
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本文利用经验正交分解法(Empirical Orthogonal Function,EOF)对不同月平均和10天平均的西北太平洋海洋表面温度距平数据进行分解,得到月平均和10天平均的西北太平洋海洋表面温度距平分布模态,并对分布模态进行比较。发现尽管数据源相同,但是不同时间分辨率的EOF结果出现正好相反的情况,文章最后从数学的角度解释了月平均和10天平均的海洋表面温度距平模态及其时间系数发生反向的原因。 相似文献
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基于海表面温度数据和海面高度异常数据，采用矢量几何法提取南海的中尺度涡旋并进行统计分析。结果显示，从海表面温度和海面高度异常数据都可以提取涡旋，两者的提取能力差异很小。由海表面温度数据可以提取较小尺度的涡旋，但跟踪涡旋时存在不稳定性；由海面高度异常数据虽然不能检测到较小尺度的涡旋，但跟踪涡旋相对稳定。两种数据所提取涡旋的时间和空间分布规律具有一致性。 相似文献
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Ramar Vinoth Mohan Gopi Thipramalai Thankappanpillai Ajith Kumar Thirunavukarassu Thangaradjou Thangavel Balasubramanian 《中国海洋大学学报(英文版)》2012,11(1):105-110
A survey on coral bleaching was carried out at Agatti Island of Lakshadweep from May to June 2010.Elevated sea surface temperatures(SSTs)of the region exceeded the seasonal average and delayed the onset of monsoon,which triggered widespread bleaching of corals.The Agatti reefs showed an average of 73%bleached corals with apparent bleaching-related mortality of sea anemones(87%)and giant clams(83%).The SST increased up to 34℃with an average maximum SST of 32.5℃ during the study period between May and June 2010.Coral reefs on the southern side of the island are fully or partially exposed to sun light during low tide in contrast to the other side.This suggests that the mortality is more likely due to the low tide exposure than exclusively due to the elevated SST.Observations indicated a clear increase in coral bleaching during April 2010,at levels higher than that in normal summer. 相似文献
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以中国南海及周边区域为例,利用ECCO2海洋模式数据模拟的SWOT观测数据评估SWOT的海平面长期观测能力。分析SWOT模拟误差表明,相位误差和横滚误差占主导,并且距离星下点越远误差越大。通过空间平滑对模拟的误差进行消除,南海地区SWOT的观测与海洋模式真值的均方根误差从4 cm降低到2 cm。对SWOT的观测和海洋模式信号进行分析发现,SWOT观测误差的空间分布基本呈南北条带状,这主要受卫星宽刈幅沿轨观测方式的影响,与海平面变化信号强度无关。进一步提取SWOT一条轨迹进行滤波和10 km×10 km网格插值,结果表明,2 km空间分辨率的地转流估计结果受噪声影响较大,而10 km分辨率结果更接近真值。 相似文献
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1 Introduction Itiswellknownthatseaiceinthepolarregionplaysanimportantroleintheglobal climatechangesasapartofclimatesystem(Carleton1989;YuanandMartinson2000, 2001;ChengandBian2002;LiuandMartinson2002;LiuandZhang2004;Gigorand Wallace2002etal).Infact,numerousmodelingstudiessuggestanimportantinfluence throughtheseaicefieldsalone(Grumbine1994,Meehl1990,Rindetal.1995).Inor dertounderstandthevariabilityofArcticandAntarcticseaicealongwiththepossiblecon nectionswithclimaticanomaliesindetail… 相似文献
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受冬季强寒潮侵袭,辽东湾会出现大范围结冰现象。为了分析2015—2020年辽东湾海冰冰情的变化规律与影响因素,本文选取Sentinel-1A/B数据开展辽东湾海冰监测。首先,采用巴氏距离选择最优纹理特征组合,再利用最大似然方法实现海冰分类;然后,根据上述海冰分类结果,分析海冰冰情等级、海冰外缘线、海冰面积、海冰类型和海冰结冰概率等冰情特征的变化规律;最后,研究海水深度、海温、气温和风速与海冰冰情的关系。主要结论如下：① 采用不同纹理特征组合方法和本文方法对2020年2月1日Sentinel-1B影像进行实验,结果表明本文方法的总体分类精度和Kappa系数分别为93.16%和0.85,分类精度最高。② 11月末到12月海冰类型以初生冰为主,间有灰冰;1月到2月中上旬以灰冰为主,间有初生冰和白冰;2月下旬到3月上旬的海冰类型以灰冰和初生冰为主。辽东湾内部结冰概率存在差异,北部沿岸结冰概率高于南部,东部结冰概率高于西部。辽东湾海冰冰情受海水深度、海温和气温影响明显,受风速影响较小。 相似文献
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Yongcun Cheng Qing Xu Yuguang Liu Chongyin Li Zengzui Rong Haibo Zong Xiu Peng Xiaobin Yin 《中国海洋大学学报(英文版)》2008,7(4):379-384
Time series of sea surface temperature (SST),wind speed and significant wave height (SWH) from meteorologicalbuoys of the National Data Buoy Center (NDBC) are useful for studying the interannual variability and trend of these quantities at the buoy areas.The measurements from 4 buoys (B51001,B51002,B51003 and B51004) in the Hawaii area are used to study theresponses of the quantities to EI Nino and Southern Oscillation (ENSO).Long-term averages of these data reflect precise seasonaland climatological characteristics of SST,wind speed and SWH around the Hawaii area.Buoy observations from B51001 suggest asignificant warming trend which is,however,not very clear from the other three buoys.Compared with the variability of SST andSWH,the wind speeds from the buoy observations show an increasing trend.The impacts of El Nifio on SST and wind waves arealso shown.Sea level data observed by altimeter during October 1992 to September 2006 are analyzed to investigate the variabilityof sea level in the Hawaii area.The results also show an increasing trend in sea level anomaly (SLA).The low-passed SLA in theHawaii area is consistent with the inverse phase of the low-passed Sol (Southern Oscillation Index).Compared with the low-passedSOl and PDO (Pacific Decadal Oscillation),the low-passed PNA (Pacific-North America Index) has a better correlation with thelow-passed SLA in the Hawaii area. 相似文献
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李令华 《广东海洋大学学报》2008,28(2):6-11
介绍了南海周边国家根据1982年《联合国海洋法公约》精神颁布的海洋法律,并叙述了这些国家的管辖区域主张以及与海洋划界有关的领海基线和基点等方面的问题。指出:南海周边国家之间若要划出专属经济区和大陆架边界线,包括我国在内的所有周边国家政府都应当修正不适宜的划界主张,并在划界原则、理论和方法上趋向一致,为早日划好边界,促进南海地区的经济发展和和平稳定而努力。 相似文献
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1 Introduction Thestudyonthefeaturesofatmosphericenvironmentbyglaciochemistryisthemajor contentofsnow iceandglobalchangeresearch.Antarcticicesheetisfarfromtheregions pollutedbyhumanactivities,andsurroundedbyocean,andtheAntarcticCircumpolarCur rentisthewideseawaterandatmospherebarrierbetweenAntarcticaandtheoutsideworld. AlloftheuniquegeographicalfeaturesmaketheimpuritiesinsnowandiceinAntarcticice sheetissimple.Therefore,itissignificanttostudytheorigins,transmissionpathsanddep ositionalst… 相似文献
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张松才 《广东海洋大学学报》2002,22(5):14-20
广东近代诗歌浓郁的海洋意象与海上丝路有着密切的联系。海上丝路深刻地影响了广东近代文学 ,为之提供了丰富的创作题材和空间 ;而广东近代文学又反过来促进了海上丝路的发展和繁荣。 相似文献
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Sea level anomalies observed by altimeter during the 1993–2006 period, thermosteric sea level anomalies estimated by using subsurface temperature data produced by Ishii and SODA reanalysis data, tide gauge records and HOAPS freshwater flux data were analyzed to investigate the long term sea level change and the water mass balance in the South China Sea. The altimeter-observed sea level showed a rising rate of (3.5±0.9) mm yr-1 during the period 1993–2006, but this figure was considered to have been highly d... 相似文献
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MEAN SEA LEVEL AND SEA SURFACE VARIABILITY OF NQRTHWEST PACIFIC OCEAN AND EASTERN CHINA SEAS FROM GEOSAT ALTIMETRY 总被引：1，自引：0，他引：1
Collinear analysis technique is widely used for determining sea surface variability with Geosat altimeterdata from its Exact Repeat Mission(ERM).But most of the researches have been only on global scaleor in oceans deeper than 2000 m.In shallow shelf waters this method is hampered by the inaccuracy ofocean tide data supplied with Geosat Geophysical Data Records(GDRs).This work uses a modified collinearanalysis technique characterized by simultaneous separation of mean sea level and ocean tide with theleast squares method,to compute sea surface variability in the Northwest Pacific Ocean and eastern ChinaSeas.The mean sea level map obtained contains not ouly bathymetric but also dynamic features such asamphidromes,indicating considerable improvement over previous works.Our sea surface variability mapsshow clearly the main current system,the well-known Zhejiang coastal upwelling,and a northern East Chi-na Sea meso-scale eddy in good agreement with satellite sea surface temperature(SST)observation and his-to 相似文献
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易传剑 《广东海洋大学学报》2010,30(2):1-5
在反思我国现有海洋法律体系的基础上,指出海洋法律体系的构建必须着眼未来,运用评价法学的法伦理原则和理性主义的建构思路加以阐发,建立以维护和发展海权为核心的,以海洋基本法主要内容的,国家和地方海洋法律法规相结合的,国际法和国内法相衔接的多层次、立体化的现代法律体系。 相似文献
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青藏高原北部泛指班公湖—怒江以北地区。该区经历了元古代末期古陆解体后的秦祁昆和戈木日-他念他翁早古生代海槽发育阶段,将联合古陆分裂为北部塔里木—华北古陆、中部唐古拉—扬子古陆、南部“西藏古陆”。志留经末期海槽闭合、形成造山带和新的联合古陆,与此同时,由于造山期相伴的裂谷作用,致使秦祁昆造山带南缘产生木孜塔格—中秦岭泥盆纪坳陷带和内陆海盆地。石炭纪进入特提斯演化阶段,由西金乌兰—玉树—金沙江裂陷槽起主控作用,在唐古拉古陆之上和扬子古陆的西北部,形成石炭纪—早二叠世一系列裂陷槽,并与陆表海沉积盆地相联系,构成北特提斯海域。此期裂陷槽于晚二叠世、闭合,相继形成可可西里—巴颜喀拉三叠纪内陆海盆地,并与陆表海沉积盆地相联系,构成青藏高原北部三叠纪特提斯海域。晚三叠世末,可可西里—巴颜喀拉三叠纪内陆海盆地闭合,形成造山带和青藏高原北部新的联合古陆;与此同时,南侧班公湖—怒江侏罗纪海槽形成,并以此首次成为特提斯大洋盆地。 相似文献
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华北陆表海从晚元古代至二叠纪经历了浅海相—海陆交互相—陆表海最后退出的海侵过程。海侵范围逐浅缩小,海侵中心向南迁移,辽东至晚二叠世早期结束了华北陆表海环境。 相似文献
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北极海冰范围时空变化及其与海温气温间的数值分析 总被引：1，自引：0，他引：1
本文利用美国国家冰雪中心提供的1989-2014年海冰范围资料,分析了北极海冰范围的年际变化和季节变化规律。分析发现,北极海冰范围呈减少趋势,每年减小
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