Modified PIC Method for Sea Ice Dynamics   总被引：1，自引：0，他引：1  

王瑞学  季顺迎SHEN Hung-tao 岳前进 《中国海洋工程》2005,19(3):457-468

The sea ice cover displays various dynamical characteristics such as breakup, rafting, and ridging under external forces. To model the ice dynamic process accurately, the effective numerical modeling method should be established. In this paper, a modified particle-in-cell （PIC） method for sea ice dynamics is developed coupling the finite difference （FD） method and smoothed particle hydrodynamics （SPH）. In this method, the ice cover is first discretized into a series of lagrangian ice particles which have their own sizes, thicknesses, concentrations and velocities. The ice thickness and concentration at Eulerian grid positions are obtained by interpolation with the Gaussian function from their surrounding ice particles. The momentum of ice cover is solved with FD approach to obtain the Eulerian cell velocity, which is used to estimate the ice particle velocity with the Gaussian function also. The thickness and concentration of ice particles are adjnsted with particle mass density and smooth length, which are adjusted with the redistribution of ice particles. With the above modified PIC method, numerical simulations for ice motion in an idealized rectangular basin and the ice dynamics in the Bohai Sea are carried out. These simulations show that this modified PIC method is applicable to sea ice dynamics simulation.  相似文献   

渤海冰情与老虎滩水温的关系     

李春花  白珊  刘钦政  张建华  宋家喜 《海洋预报》2007,24(3):1-5

本文对2000～2004年连续5年冬季老虎滩水温与渤海冰面积数据进行统计分析,得到渤海海冰面积与老虎滩水温的回归关系,对冬季海冰预报具有一定的参考意义。  相似文献   

海冰业务化预报基础研究进展     

李春花  刘钦政  白珊  张启文  李宝辉  刘煜  王旭 《海洋预报》2005,22(Z1):50-55

本文概述了我国近年来在海冰预报基础研究方面的工作进展情况,着重介绍了在我国海冰的气候成因、海冰分布特征和变化规律等方面的研究成果.  相似文献   

融冰季节北极破碎冰区热通量的初步研究   总被引：5，自引：1，他引：5  

史久新  赵进平  矫玉田 《海洋科学进展》2002,20(3):35-43

利用航空遥感数字影像的解析结果和实测气象，海洋和海冰资料，定量研究了夏季融冰期北极破碎冰区的热通量，计算了海洋对大气的热贡献，结果表明，在北极夏季海冰融化时，短波辐射远远大于感热和潜热通量，是表面热通量的决定因素，海洋对大气的热贡献主要由长波辐射决定，在观测期间，海洋对大气的热贡献为38～104Wm^-2，这部分热量的大小与海冰的密集度有关，当海冰密集度小于0.8时，海洋对大气的热贡献随海冰密度度的增大而减小，而当海冰密集度超过0.8以后，该热通量将随海冰密集度的增大而增大。  相似文献   

海冰板的环形屈曲的压缩破坏   总被引：2，自引：0，他引：2  

唐立强  陈会军等 《海洋工程》2001,19(4):29-33

在轴对称条件下，给出海冰板的环向屈曲面临载荷，从细观力学的观点分析了微裂纹开裂的条件，扩展方向并给出绕海洋平台柱腿冰的损伤区的尺度。所给出的临界半径是一个与冰材料力学特征，冰的微结构参数一海洋平台柱腿半径相关的特征参数。对现场所观察和测量的结构给出了解释和定量分析。  相似文献   

Progresses in the ice formation of glaciers in China     

Xiangying LI  Shiyin LIU  Donghui SHANGGUAN  Aigang LU 《Frontiers of Earth Science》2008,2(3):346-355

Glaciers, formed by snowfall and characterized by movement and size, are the most sensitive indicators to climate change. The ice formation of glaciers (the processes, mechanisms and results of transformation from snow to ice) can indicate the growth condition, the formation process and the physical characteristics of glaciers. Its spatial variation can also reflect glacier change, and further reveal climate change. Studies on ice formation of glaciers in China were initiated in 1962, when Xie and others studied the ice formation of Glacier No.1 at the Urumqi River head, Tianshan Mountain. Other researchersfollowed suit and did studies on ice formation of glaciers in Qilian Mountain. As time goes by, the concept of ice formation came into being in China. This paper reviews the development history of glacier zones, and the studies of ice formation of glaciers in China since the 1960s. These studies mainly focus on Qilian Mountain, Tianshan Mountain, Altay Mountain, and the western Kunlun Mountain, Himalaya Mountain, the southeastern Tibetan and Hengduan Mountains. The paper also discusses the significance of ice formation studies, the limitation and deficiency of previous studies, and the prospects and suggestions for future studies. __________ Translated from Advances in Earth Science, 2007, 22(4): 386–395 [译自: 地球科学进展]  相似文献   

南极海冰、冰穴和冰川冰及其对水团形成和变性的作用   总被引：2，自引：0，他引：2       下载免费PDF全文

董兆乾  梁湘三 《极地研究》1993,5(3):1-16

本文利用前人的成果及笔者1992/1993年的南极海冰观测和收集的资料以及水文观测资料数据阐述了南极海冰的特性,特别是南极海冰过程、冰穴以及冰川冰对南极水团(南极表层水、南极底层水、南极陆架水、南极中层水以及南极冰架水)的形成和变性所起的特殊作用。 南极海冰覆盖面积的年际变化,夏季最大年份是最小年份的2倍多,冬季年间变化较小,最大仅为20％;但其季节变化非常大,冬季平均覆盖面积通常是夏季的5倍。南极海冰对大气-海洋间相互作用有重大影响,特别是深海洋区中冬季的结冰和发育造成的垂向对流、夏季的融化是形成南极表层水(含南极冬季水和南极夏季表层水),进而形成南极中层水的主要原因;南极陆架区的的海冰兴衰过程是形成南极陆架水的直接原因,它与变性南极绕极深层水混合并受到冰川冰的进一步冷却作用,成为形成南极底层水的主要水团;南极冰架底部的冷却、融化和冰架以下水体的结冰作用形成的高盐对流过程产生的南极冰架水,亦是形成南极底层水的贡献者。 冰穴是70年代以来卫星观测的重大发现。对其形成和对大气、海洋的影响作用尚不完全清楚,初步的研究成果表明,冰穴中产生的热盐对流对南极水团的形成、变性、大洋深层的翻转以及海洋-大气间的热量传输和气体交换起有非常重要的作用。  相似文献   

Synchronism of Holocene East Asian monsoon variations and North Atlantic drift-ice tracers   总被引：3，自引：2，他引：3  

Stephen C. Porter  Zhou Weijian 《Quaternary Research》2006,65(3):443-449

Eighteen radiocarbon-dated eolian and paleosol profiles within a 1500-km-long belt along the arid to semi-arid transition zone of north-central China record variations in the extent and strength of the East Asian summer monsoon during the Holocene. Dated paleosols and peat layers represent intervals when the zone was dominated by a mild, moist summer monsoon climate that favored pedogenesis and peat accumulation. Brief intervals of enhanced eolian activity that resulted in the deposition of loess and eolian sand were times when strengthened winter monsoon conditions produced a colder, drier climate. The monsoon variations correlate closely with variations in North Atlantic drift-ice tracers that represent episodic advection of drift ice and cold polar surface water southward and eastward into warmer subpolar water. The correspondence of these records over the full span of Holocene time implies a close relationship between North Atlantic climate and the monsoon climate of central China.  相似文献   

玛纳斯河一级电站引水渠沿线提取地下水进行融冰的可行性研究     

王春得 《地下水》2005,27(5):347-349

通过对向斜洼地含水层水文地质特征的勘探及研究,对研究区的水文地质边界条件进行了概化,并用水均衡法估算了地下水资源量,对拟建一级电站引水渠沿线提取地下水进行融冰的可行性进行了研究,并提出了取水方案.  相似文献   

东南极Lambert冰川-Amery冰架系统平衡通量分布的计算   总被引：2，自引：1，他引：2  

王清华  宁津生 《冰川冻土》2002,24(5):500-505

通过对Lambert冰川盆地(LGB)考察路线上约1 700 km长的LGB剖面和距冰架末端约50 km、长150 km的A剖面, 分别利用GPS冰流速值及雷达测厚值进行冰通量的计算得出:每年流过LGB剖面的冰通量为43.95 Gta-1, 而通过A剖面的冰通量仅为26. 42 Gt*a-1, Amery冰架底部净融化量为7.8 Gt*a-1. 整个Lambert冰川-Amery冰架系统(LAS)地区的表面净物质平衡总量约为90 Gt*a-1; LGB地区的表面净物质平衡总量为46 Gt*a-1. 通过分析得出, 整个LAS地区及LGB地区均处于物质正平衡状态, 而LAS流域的上游区域S'则处于物质负平衡状态.  相似文献