深渊环流动力过程
项目来源
国(略)研(略)((略)D(略)
项目主持人
徐(略)
项目受资助机构
中(略)院(略)学(略)研(略)
项目编号
2(略)Y(略)3(略)0(略)
立项年度
2(略)
立项时间
未(略)
研究期限
未(略) (略)
项目级别
国(略)
受资助金额
4(略)0(略)
学科
深(略)技(略)备
学科代码
未(略)
基金类别
“深(略)技(略)备”重点专项
关键词
海(略) (略);(略) (略)潮(略)T(略)c(略) (略)e(略)t(略) (略)o(略) (略)n(略)n(略)T(略)
参与者
喻(略)会(略)学(略)泽(略)
参与机构
未(略)
项目标书摘要:通过(略)道走航CTD、AD(略)观测数据进行分析,(略)ITgcm深渊混合(略)流模型,我们发现,(略)5°E断面上盐度、(略)000-5000米(略)旋式环流,计算得到(略)量为-1.6 Sv(略)观测估算得到的-1(略)-马里亚纳海沟通道(略),在3000米以下(略)CDW两个深层水团(略)DW和LCDW深层(略)orpe参数化方案(略)得到了该通道的耗散(略)0米至底的平均耗散(略) m2s-3,平均(略)3 m2s-1 。(略)率的MITgcm模(略)周边海域的主要四大(略)O1内潮进行模拟研(略)2分潮的内潮能通量(略)内潮能通量分布看,(略)生成,然后向外传播(略) kw/m。结合混(略)区由于内潮作用引起(略)的量级,结果显示在(略)也可达10-8 W(略)的值也在10-3 (略)
Applicati(略): By anal(略)nd ADCP i(略)rvation d(略)passage o(略)na-Yap Tr(略)storical (略)ervation (略)ll as bui(略)e three-d(略)high-reso(略)cm abyssa(略)del and H(略)l circula(略) seasonal(略) in salin(略)an curren(略)2.5°E sec(略) Mariana (略)depicted.(略)ic circul(略)found at (略)f 4000-50(略)low 6000 (略)LCDW tran(略)e in the (略)ulated to(略), is 60% (略) previous(略)h is esti(略)ing a sma(略)f CTD obs(略)On the 14(略)ion of th(略)f the Yap(略)ench, two(略) masses o(略)LCDW are (略)ributed b(略)eters, an(略) of 4000 (略)he bounda(略)UCDW and (略) the obse(略)a of LADC(略)assage, c(略)h the Tho(略)erization(略)lculation(略)sipation (略)ffusivity(略) the aver(略)tion rate(略)meters to(略) is 9.7×1(略)while the(略)ffusivity(略)9×10-3 m2(略)e-dimensi(略)drostatic(略)lution MI(略)cal model(略) simulate(略)ain tidal(略) M2, S2, (略)s in the (略)nch and i(略) ocean. I(略) that in (略)omain, th(略)al tidal (略) is much (略) the othe(略)tribution(略)l tidal e(略)shows tha(略)nal tide (略)enerated (略)ana Islan(略)ropagates(略)bsequentl(略)ngest int(略) energy f(略)/m. Combi(略)e mixed p(略)tion sche(略)mated the(略)of the di(略)nd diffus(略)caused by(略)al tide t(略)nitude of(略)ation in (略)of trench(略)10-8 W/kg(略)gnitude o(略)sivity is(略)3 m2s-1, (略) order of(略)higher th(略)ired vert(略) level th(略)ing deep (略)ication.
项目受资助省
海(略)
1.海沟观测及内潮数值模拟(Observation and numerical simulation of internal tide in the trench)
- 关键词:
- 海沟、观测、模式、内潮、Trench、Observation、Model、Internal Tide
- 徐洪周;喻琉;江会常;尚学昆;倪泽楷;
- 《中国科学院深海科学与工程研究所;》
- 2019年
- 报告
通过对马里亚纳—雅浦海沟通道走航CTD、ADCP观测数据和历史潜标观测数据进行分析,以及构建三维高分辨率MITgcm深渊混合模型和HYCOM深渊环流模型,我们发现,在马里亚纳海沟142.5°E断面上盐度、流速均存在季节变化,4000-5000米及6000米以深均为气旋式环流,计算得到深渊中净的LCDW输运量为-1.6 Sv,比前人利用少量CTD观测估算得到的-1 Sv大了60%。雅浦—马里亚纳海沟通道140.32°E断面上,在3000米以下主要分布着UCDW和LCDW两个深层水团,4000米深度为UCDW和LCDW深层水团的分界线。利用Thorpe参数化方案和LADCP的观测数据得到了该通道的耗散率和扩散率,其中3500米至底的平均耗散率为9.7×10-10 m2s-3,平均扩散率为3.9×10-3 m2s-1。利用三维非静力、高分辨率的MITgcm模式,对马里亚纳海沟及其周边海域的主要四大分潮M2、S2、K1、O1内潮进行模拟研究,发现在这一海区,M2分潮的内潮能通量远大于其他三个分潮。从内潮能通量分布看,内潮主要在马里亚纳岛弧生成,然后向外传播,最强的内潮能通量达6 kw/m。结合混合参数化公式估算了该海区由于内潮作用引起的耗散及垂向混合扩散率的量级,结果显示在海沟内部,其耗散的量级也可达10-8 W/kg,垂向混合扩散率的值也在10-3 m2s-1左右。 By analysing CTD and ADCP in-situ observation data of the passage of the Mariana-Yap Trench and historical mooring observation data,as well as building up the three-dimensional high-resolution MITgcm abyssal mixing model and HYCOM abyssal circulation model,seasonal variations in salinity and ocean current in the 142.5°E section of the Mariana Trench are depicted.Two cyclonic circulations are found at the depth of 4000-5000 m and below 6000 m.The net LCDW transport volume in the abyss,calculated to be-1.6 Sv,is 60%larger than previous-1 Sv which is estimated by using a small amount of CTD observations.On the 140.32°E section of the passage of the Yap-Mariana Trench,two deep water masses of UCDW and LCDW are mainly distributed below 3000 meters,and the depth of 4000 meters is the boundary between UCDW and LCDW.Using the observation data of LADCP in this passage,combined with the Thorpe parameterization scheme,calculation of the dissipation rate and diffusivity shows that the average dissipation rate from 3500 meters to the bottom is 9.7×10-10 m2s-3 while the average diffusivity rate is 3.9×10-3 m2s-1.A three-dimensional non-hydrostatic,high-resolution MITgcm numerical model is used to simulate the four main tidal components M2,S2,K1,O1 tides in the Mariana Trench and its adjacent ocean.It was found that in the model domain,the M2 internal tidal energy flux is much larger than the others.The distribution of internal tidal energy flux shows that the internal tide is mainly generated in the Mariana Island arc and propagates outward subsequently.The strongest internal tidal energy flux is 6 kw/m.Combined with the mixed parameterization scheme,we estimated the magnitude of the dissipation and diffusivity rate caused by the internal tide that the magnitude of the dissipation in the bottom of trench can reach 10-8 W/kg and the magnitude of the diffusivity is around 10-3 m2s-1,which is an order of magnitude higher than the required vertical mixing level that maintaining deep sea stratification.
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