北极地区不同冰龄的海冰厚度变化研究   总被引：1，自引：0，他引：1  

毕海波  付敏  孙科  刘一霖  徐秀丽  黄海军 《海洋学报(英文版)》2016,35(10):1-10

In this study, changes in Arctic sea ice thickness for each ice age category were examined based on satellite observations and modelled results. Interannual changes obtained from Ice, Cloud, and Land Elevation Satellite(ICESat)-based results show a thickness reduction over perennial sea ice(ice that survives at least one melt season with an age of no less than 2 year) up to approximately 0.5–1.0 m and 0.6–0.8 m(depending on ice age) during the investigated winter and autumn ICESat periods, respectively. Pan-Arctic Ice Ocean Modeling and Assimilation System(PIOMAS)-based results provide a view of a continued thickness reduction over the past four decades. Compared to 1980 s, there is a clear thickness drop of roughly 0.50 m in 2010 s for perennial ice. This overall decrease in sea ice thickness can be in part attributed to the amplified warming climate in north latitudes. Besides, we figure out that strongly anomalous southerly summer surface winds may play an important role in prompting the thickness decline in perennial ice zone through transporting heat deposited in open water(primarily via albedo feedback) in Eurasian sector deep into a broader sea ice regime in central Arctic Ocean. This heat source is responsible for enhanced ice bottom melting, leading to further reduction in ice thickness.  相似文献   

Arctic sea ice volume export through the Fram Strait from combined satellite and model data: 1979–2012   总被引：1，自引：0，他引：1  

张泽华  毕海波  孙科  黄海军  刘艳霞  严立文 《海洋学报(英文版)》2017,36(1):44-55

By combing satellite-derived ice motion and concentration with ice thickness fields from a popular model PIOMAS we obtain the estimates of ice volume flux passing the Fram Strait over the 1979–2012 period. Since current satellite and field observations for sea ice thickness are limited in time and space, the use of PIOMAS is expected to fill the gap by providing temporally continued ice thickness fields. Calculated monthly volume flux exhibits a prominent annual cycle with the peak record in March(roughly 145 km3/month) and the trough in August(10 km~3/month). Annual ice volume flux(1 132 km~3) is primarily attributable to winter(October through May) outflow(approximately 92%). Uncertainty in annual ice volume export is estimated to be 55 km~3(or 5.7%). Our results also verified the extremely large volume flux appearing between late 1980 s and mid-1990 s. Nevertheless, no clear trend was found in our volume flux results. Ice motion is the primary factor in the determination of behavior of volume flux. Ice thickness presented a general decline trend may partly enhance or weaken the volume flux trend. Ice concentration exerted the least influences on modulating trends and variability in volume flux. Moreover, the linkage between winter ice volume flux and three established Arctic atmospheric schemes were examined. Compared to NAO, the DA and EOF3 mechanism explains a larger part of variations of ice volume flux across the strait.  相似文献   

长江口河口锋的悬沙及动力特征初探     

毕世普  黄海军  庄克琳  周良勇 《海洋科学》2009,33(12):12-17

通过对2002年9月、2003年4月和2004年10月在长江口滨外区多船同步定点观测的数据进行分析,捕捉到了长江口河口锋带位置,并利用调查数据分析了河口锋带的动力特征.结果表明:长江口河口锋的位置大约位于122°10′E,30°50′N至122°20′E,31°00′N一线附近,在河口锋带有着较为强烈的河海相互作用,流速不符合典型的对数流速曲线,河水与海水的相互消长局限于海面以下5 m的表层范围,观测表明在河口锋面区悬浮泥沙为泥沙流伏在海水之上输运.  相似文献   

北极海冰变率的独特模式及其与大气强迫的关系   总被引：1，自引：1，他引：0  

梁钰  毕海波  王云鹤  张泽华  黄海军 《海洋学报(英文版)》2020,39(9):60-72

The spatial structure of the Arctic sea ice concentration(SIC) variability and the connection to atmospheric as well as radiative forcing during winter and summer for the 1979–2017 period are investigated. The interannual variability with different spatial characteristics of SIC in summer and winter is extracted using the empirical orthogonal function(EOF) analysis. The present study confirms that the atmospheric circulation has a strong influence on the SIC through both dynamic and thermodynamic processes, as the heat flux anomalies in summer are radiatively forced while those in winter contain both radiative and "circulation-induced" components. Thus,atmospheric fluctuations have an explicit and extensive influence to the SIC through complex mechanisms during both seasons. Moreover, analysis of a variety of atmospheric variables indicates that the primary mechanism about specific regional SIC patterns in Arctic marginal seas are different with special characteristics.  相似文献   

小清河河口海域冬季悬浮体特征     

杜廷芹  黄海军  严立文  刘桂卫  宋召军 《海洋地质与第四纪地质》2008,28(6)

利用2007年1月对小清河口附近海区悬浮体和沉积物调查的数据,分析了小清河口海域冬季悬浮体的空间分布和粒度特征,探讨了悬浮体与海底表层沉积物的关系,并对其来源进行了初步分析。结果表明,悬浮体浓度和粒度特征空间分布不均,但有一定的规律性,并与海底表层沉积物之间存在着密切的联系;结合已有研究资料综合分析认为,河道内悬浮体主要来源于河流输移、河道两侧潮滩物质输送,而河口附近海域悬浮体主要源于近岸浅滩和海底表层沉积物的再悬浮和搬运。  相似文献   

黄河清水沟流路河口尾闾段河床形态萎缩特征   总被引：3，自引：0，他引：3  

王开荣  黄海军  张永平 《海洋地质与第四纪地质》2008,28(2):15-22

在简述黄河河口尾闾河段相关特征的基础上,从河槽横断面形态、河床纵剖面形态包括主槽河底平均高程、河床纵比降、平滩流量变化等方面分析了黄河河口尾闾河段河床形态萎缩特征。清水沟流路在1976—2000年期间,黄河口尾闾河段的发育大致可分为4个阶段,即初期发育阶段、中期成型阶段、后期萎缩阶段、末期人工干预发展阶段。相应的发育时期分别为20世纪80年代中期以后,尾闾河段主槽宽深比上升、横比降升高、河段纵比降下降、河床平均高程抬升,其相应时期内河道平滩流量相对偏低。这一现象可能与黄河来水来沙偏枯相关。河道疏浚、人工出汊、调水调沙等措施对尾闾河段河床形态的萎缩有一定的抑制作用,但其影响是暂时的,不能改变河道萎缩的总体趋势。  相似文献   

卫星影像在黄河三角洲岸线变化研究中的应用   总被引：16，自引：1，他引：16  

黄海军  郭建军 《海洋地质与第四纪地质》1994,14(2):29-37

本文对比了黄河三角洲岸线变化速率与陆地卫星资料空间分辨率以及分析用卫片对比岸线变化可能产生的误差等，论证了用卫片研究该区岸线变化的可行性，通过潮位校正，坡度改正等方法提供了一套用卫片研究验潮站位较少的淤泥海滩岸线变化的方法，并讨论了提高该方法精度途径。在些基础上，对比了本区１９８５．５．１－１９７７．５．１０；１９８６．６．５－１９７５．５．２１和１９８９．５．２８－１９７７．５．１０三组陆地卫星  相似文献   

领了“红本本”圆了“安居梦”——广西加快推进易地扶贫搬迁安置住房不动产登记发证工作纪实     

潘正伟  黄海军  韦宏益  陈汝华 《南方国土资源》2021,(4):12-14

广西是全国脱贫攻坚的主战场之一,部分大石山区生产、生活条件恶劣,基础设施薄弱.为切实提高贫困人口的生活水平,广西将71万建档立卡贫困人口列入易地搬迁计划,难度之大,可见一斑.如何保障“老、少、边、山、库”地区71万人搬得出、稳得住、能致富?广西自然资源系统向党和人民交出了一份满意的答卷.  相似文献   

基于决策树方法的海岛土地利用分类研究     

杨曦光  黄海军  严立文  都本绪 《国土资源遥感》2012,(2):116-120

以山东省荣成市镆铘岛为例,利用SPOT 5卫星数据,探讨了基于决策树方法的海岛土地利用类型的遥感分类.结果表明,利用决策树分类方法进行海岛土地利用类型分类,可以得到较好的分类结果(分类的平均精度达到86.46％,Kappa系数为0.8414);与其他分类方法比较,决策树分类法的分类精度有明显的提高,在海岛土地利用类型调查中具有较好的应用潜力.  相似文献   

莱州屺姆岛—刁龙咀近岸海域沉积物格局与粒径趋势简     

严立文  黄海军  刘勇  杨曦光  刘晓 《海洋地质与第四纪地质》2014,(1):29-36

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