共查询到20条相似文献，搜索用时 140 毫秒
1.
Bai Peng Wang Jia Chu Philip Hawley Nathan Fujisaki-Manome Ayumi Kessler James Lofgren Brent M. Beletsky Dmitry Anderson Eric J. Li Yaru 《Ocean Dynamics》2020,70(7):991-1003
Ocean Dynamics - A partly coupled wave-ice model with the ability to resolve ice-induced attenuation on waves was developed using the Finite-Volume Community Ocean Model (FVCOM) framework and... 相似文献
2.
Ocean Dynamics - Roles of atmospheric variabilities in the formation of Indian Ocean Dipole (IOD) were investigated using an ocean general circulation model and different atmospheric forcing... 相似文献
3.
Ocean Dynamics - This study modeled Stokes drift in the marginal ice zone (MIZ) of the Arctic Ocean using WAVEWATCH III. Applying two viscoelastic and one empirical frequency-dependent... 相似文献
4.
The influence of initial conditions and open boundary conditions on shelf circulation in a 3D ocean-shelf model of the North East Atlantic 总被引：1，自引：0，他引：1
Data from climatology (World Ocean Atlas) and two large scale operational ocean models (Forecasting Ocean Assimilation Model
(FOAM), UK Met. Office and the Navy Coastal Ocean Model (NCOM), US Naval Research Laboratory) are used to give initial and
open boundary conditions for a northeast Atlantic implementation of the Proudman Oceanographic Laboratory Coastal Ocean Model
System (POLCOMS). We study the effects of using the different datasets on the temperature fields and the circulation. On the
continental shelf, comparisons of POLCOMS output with Advanced Very High Resolution Radiometer sea surface temperature data
suggest that the effect of using different ocean model initial and boundary conditions is small and that, after 15 months
of model time, the impact of the different initial conditions is negligible. Stronger evidence of influence is seen in the
deeper oceanic regions of the domain. Volume fluxes through sections governing flow into and out of the North Sea, through
the Irish Sea and along the shelf edge show that the impact of the different boundary conditions is small on the shelf but
significant elsewhere. These results are contrasted with the use of climatology to assess the value of these Global Ocean
Data Assimilation Experiment ocean model products. 相似文献
5.
Ocean Dynamics - Since the 2004 Indian Ocean tsunami and particularly after the 2011 Tohuku tsunami, there has been a significant increase of computer simulation using real-time data; however,... 相似文献
6.
Vasou Panagiotis Vervatis Vassilios Krokos George Hoteit Ibrahim Sofianos Sarantis 《Ocean Dynamics》2020,70(8):1053-1065
Ocean Dynamics - The variability of the water mass exchange between the Arabian Gulf and the Indian Ocean is investigated using a high-resolution (1/36°) ocean model. We focus on the period... 相似文献
7.
Using reanalysis data, the role of initial signals in the tropical Pacific Ocean in predictions of negative Indian Ocean Dipole (IOD) events were analyzed. It was found that the summer predictability barrier (SPB) phenomenon exists in predictions, which is closely related to initial sea temperature errors in the tropical Pacific Ocean, with type-1 initial errors presenting a significant west-east dipole pattern in the tropical Pacific Ocean, and type-2 initial errors showing the opposite spatial pattern. In contrast, SPB-related initial sea temperature errors in the tropical Indian Ocean are relatively small. The initial errors in the tropical Pacific Ocean induce anomalous winds in the tropical Indian Ocean by modulating the Walker circulation in the tropical oceans. In the first half of the prediction year, the anomalous winds, combined with the climatological winds in the tropical Indian Ocean, induce a basin-wide mode of sea surface temperature (SST) errors in the tropical Indian Ocean. With the reversal of the climatological wind in the second half of the prediction year, a west-east dipole pattern of SST errors appears in the tropical Indian Ocean, which is further strengthened under the Bjerknes feedback, yielding a significant SPB. Moreover, two types of precursors were also identified: a significant west-east dipole pattern in the tropical Pacific Ocean and relatively small temperature anomalies in the tropical Indian Ocean. Under the combined effects of temperature anomalies in the tropical Indian and Pacific oceans, northwest wind anomalies appear in the tropical Indian Ocean, which induce a significant west-east dipole pattern of SST anomalies, and yield a negative IOD event. 相似文献
8.
Interannual variability in the Biannual Rossby waves in the tropical Indian Ocean and its relation to Indian Ocean Dipole and El Nino forcing 总被引：1，自引：0，他引：1
The interannual variability of the tropical Indian Ocean is studied using Simple Ocean Data Assimilation (SODA) sea surface
height anomalies (SSHA) and Hadley Centre Ice Sea Surface Temperature anomalies. Biannual Rossby waves (BRW) were observed
along the 1.5° S and 10.5° S latitudes during the Indian Ocean Dipole (IOD) years. The SODA SSHA and its BRW components were
comparable with those of Topex/Poseidon. The phase speed of BRW along 1.5° S is −28 cm/s, which is comparable with the theoretical
speed of first mode baroclinic (equatorially trapped) Rossby waves. This is the first study to show that no such propagation
is seen along 1.5° S during El Nino years in the absence of IOD. Thus the westward propagating downwelling BRW in the equatorial
Indian Ocean is hypothesized as a potential predictor for IOD. These waves transport heat from the eastern equatorial Indian
Ocean to west, long before the dipole formation. Along 10.5° S, the BRW formation mechanisms during the El Nino and IOD years
were found to be different. The eastern boundary variations along 10.5° S, being localized, do not influence the ocean interior
considerably. Major portion of the interannual variability of the thermocline, is caused by the Ekman pumping integrated along
the characteristic lines of Rossby waves. The study provides evidence of internal dynamics in the IOD formation. The positive
trend in the downwelling BRW (both in SODA and Topex/Poseidon) is of great concern, as it contributes to the Indian Ocean
warming. 相似文献
9.
南印度洋副热带偶极模（Subtropical Dipole Pattern,SDP）是印度洋存在的另一种很明显的偶极型海温差异现象,在年际和年代际尺度上均有十分明显的表现.而目前有关印度洋海气相互作用的研究主要集中在赤道印度洋地区,针对南印度洋地区的工作还比较少,特别是有关南印度洋海温与ENSO（El NiDo-Southern Oscillation）事件关系的研究.本文初步探讨了年际尺度上南印度洋副热带偶极型海温变化差异与ENSO事件的关系,发现SDP与ENSO事件有密切的联系,SDP事件就像连接正负ENSO位相转换的一个中间环节,SDP事件前后期ENSO的位相刚好完全相反.进一步,本文通过分析SDP事件前后期海温、高低层风、低层辐合辐散、高空云量和辐射等的变化特征研究了南印度洋偶极型海温异常在ENSO事件中的作用,结果表明：SDP在ENSO事件中的作用不仅涉及海气相互作用的正负反馈过程,还与热带和副热带大气环流之间的相互作用有关,特别是与东南印度洋海温变化所引起的异常纬向风由赤道印度洋向赤道太平洋传播的过程等有十分直接的关系;同时,SDP对ENSO事件的影响在很大程度上还依赖于大尺度平均气流随季节的变换. 相似文献
10.
上海地震台阵对2004年12月26日印度洋地震的精确定位 总被引：1，自引：0，他引：1
通过对上海地震台网和上海地震台阵对2004年12月26日印度洋地震的定位结果与NEIC定位结果的比较，得出上海台阵定位结果比上海台网的定位结果更加精确。 相似文献
11.
Ocean Dynamics - The existence of cross-sectionally averaged morphodynamic equilibria of tidal inlets is investigated, using a cross-sectionally averaged model, and their sensitivity to variations... 相似文献
12.
Ding Yang Bao Xianwen Zhou Lingling Bi Congcong Yao Zhigang Ma Chao Chu Qinqin 《Ocean Dynamics》2020,70(6):803-825
Ocean Dynamics - The westward transversal current (TC) in the southern Yellow Sea entrance was investigated during winter 2007 using a numerical ocean model. The three-dimensional structures and... 相似文献
13.
Audrey Hasson Ariane Koch-Larrouy Rosemary Morrow Mélanie Juza Thierry Penduff 《Ocean Dynamics》2012,62(3):335-354
Understanding the origin and fate of mode and intermediate waters (MW) in the subtropical Pacific Ocean is critical for climate,
as MW store and export a large volume of CO2, heat, nutrients and salinity to lower latitudes at depths isolated from the atmosphere. A realistic 4D simulation has been
used to track and quantify the MW routes and their property characteristics at the last region of subduction. It also allows
us to quantify the water transformation after subduction. The simulation has been compared to available observations using
a collocation method that interpolated model data onto observations in time and space. The comprehensive comparisons gave
us confidence in the model’s capacity to reproduce MW characteristics. A quantitative Lagrangian analysis was performed on
the model output to depict the origin, the fate and the route of MW circulating in the southern Pacific Ocean, selected in
the density range of 26.8–27.4 kg m−3. We found 18 Sv of MW were transported northward in patches through the 42° S section, mostly between 200 and 800 m depth.
Of this transport, 8 Sv enters the Pacific Ocean in the upper layer south of Tasmania and subducts in the Pacific. The remainder
is not ventilated in the Pacific sector: 4 Sv is advected from the Indian Ocean south of Tasmania at intermediate depth and
finally 6 Sv is part of an intermediate depth recirculation within the Pacific Ocean. Particles take up to 30 years to travel
northward through our domain before crossing the 42° S section. Southward transport branches also exist: 3 Sv flows southward
following the eastern New Zealand coast and then exits through Drake Passage. An additional 4 Sv passes southward in the Tasman
Sea, following the eastern Tasmanian coast and enters the Indian Ocean south of Tasmania, as part of the Tasman Leakage. Four
different formation sites have been identified, where the MW are last ventilated. These formation sites have different water
masses with specific salinity ranges. A study on the evolution of the physical characteristics of each of these water masses
has been performed. All MW characteristics become more homogeneous at 42° S than they were when they left the mixed layer.
This study confirms the homogenisation of mode waters at intermediate depth in the Pacific Ocean as previously revealed in
the Indian Ocean using the same methodology. Transformations are shown to be mostly isopycnal in the Tasman Sea and diapycnal
farther east. 相似文献
14.
Ocean Dynamics - Internal tides are studied in the central Mediterranean Sea using observational data and numerical experiments. Both numerical results and observations indicate that the baroclinic... 相似文献
15.
本文对亚洲太平洋地区地球动力学计划(APRGP,简称亚太网)在1999-2001年采集的三期GPS观测数据,利用GAMIT/GLOBK软件进行了分析处理,得出各期的观测站在ITRF97框架下的三维直角坐标,并根据三期观测数据中的重复观测站进行了速度场计算和地壳形变特征分析。结果表明亚洲大陆板块具有明显的顺时针旋转运动特征;印度板块和澳大利亚板块从西南方向对亚洲大陆板块进行挤压;而西太平洋地区各观测站则向西北方向运动。这些特征与国内GPS区域网观测数据处理得出的结论是一致的,而本文则揭示了更大范围的亚洲太平洋地区地壳形变信息。 相似文献
16.
A New Tool for Inundation Modeling: Community Modeling Interface for Tsunamis (ComMIT) 总被引：2，自引：0，他引：2
V. V. Titov C. W. Moore D. J. M. Greenslade C. Pattiaratchi R. Badal C. E. Synolakis U. Kânoğlu 《Pure and Applied Geophysics》2011,168(11):2121-2131
Almost 5 years after the 26 December 2004 Indian Ocean tragedy, the 10 August 2009 Andaman tsunami demonstrated that accurate
forecasting is possible using the tsunami community modeling tool Community Model Interface for Tsunamis (ComMIT). ComMIT
is designed for ease of use, and allows dissemination of results to the community while addressing concerns associated with
proprietary issues of bathymetry and topography. It uses initial conditions from a precomputed propagation database, has an
easy-to-interpret graphical interface, and requires only portable hardware. ComMIT was initially developed for Indian Ocean
countries with support from the United Nations Educational, Scientific, and Cultural Organization (UNESCO), the United States
Agency for International Development (USAID), and the National Oceanic and Atmospheric Administration (NOAA). To date, more
than 60 scientists from 17 countries in the Indian Ocean have been trained and are using it in operational inundation mapping. 相似文献
17.
Long-term variability of heat content (HC) in the upper 1,000 m of the Arctic Ocean is investigated using surface and subsurface
temperature and current data during 1958–2005 compiled by Simple Ocean Data Assimilation. Annual cycle of the Arctic Ocean
HC is controlled primarily by the negative and positive excursions in net upper ocean heat flux, while the inter-annual variability
is mainly associated with meridional thermal advection from the North Atlantic Ocean. Variability in HC is experienced as
a basin-wide cooling/warming in association with the Arctic Oscillation on a decadal time scale. In the first three dominant
modes of Empirical Orthogonal Function, the maximum amplitude of HC variability occurs in the Greenland–Norwegian Sea and
Eurasian Basin. In general, HC showed increasing trend during 1958–2005 indicating continuous warming with regional variations
in magnitude. 相似文献
18.
Chen Minmo Zhu Ze-Nan Zhang Chuanzheng Zhu Xiao-Hua Zhang Zhensheng Wang Min Zheng Hua Zhang Xinyu Chen Juntian He Zongcai Dai Longhao Kaneko Arata 《Ocean Dynamics》2021,71(8):811-821
Ocean Dynamics - Herein, tidal current and associated nonlinear currents were measured using nine coastal acoustic tomography (CAT) systems surrounding the tomography domain in Xiangshan Bay from... 相似文献
19.
Ocean Dynamics - The interactions between barotropic tides and mesoscale processes were studied using the results of a numerical model in which tidal forcing was turned on and off. The research... 相似文献
20.
Tarang Khangaonkar Brandon Sackmann Wen Long Teizeen Mohamedali Mindy Roberts 《Ocean Dynamics》2012,62(9):1353-1379
Nutrient pollution from rivers, nonpoint source runoff, and nearly 100 wastewater discharges is a potential threat to the ecological health of Puget Sound with evidence of hypoxia in some basins. However, the relative contributions of loads entering Puget Sound from natural and anthropogenic sources, and the effects of exchange flow from the Pacific Ocean are not well understood. Development of a quantitative model of Puget Sound is thus presented to help improve our understanding of the annual biogeochemical cycles in this system using the unstructured grid Finite-Volume Coastal Ocean Model framework and the Integrated Compartment Model (CE-QUAL-ICM) water quality kinetics. Results based on 2006 data show that phytoplankton growth and die-off, succession between two species of algae, nutrient dynamics, and dissolved oxygen in Puget Sound are strongly tied to seasonal variation of temperature, solar radiation, and the annual exchange and flushing induced by upwelled Pacific Ocean waters. Concentrations in the mixed outflow surface layer occupying approximately 5–20?m of the upper water column show strong effects of eutrophication from natural and anthropogenic sources, spring and summer algae blooms, accompanied by depleted nutrients but high dissolved oxygen levels. The bottom layer reflects dissolved oxygen and nutrient concentrations of upwelled Pacific Ocean water modulated by mixing with biologically active surface outflow in the Strait of Juan de Fuca prior to entering Puget Sound over the Admiralty Inlet. The effect of reflux mixing at the Admiralty Inlet sill resulting in lower nutrient and higher dissolved oxygen levels in bottom waters of Puget Sound than the incoming upwelled Pacific Ocean water is reproduced. By late winter, with the reduction in algal activity, water column constituents of interest, were renewed and the system appeared to reset with cooler temperature, higher nutrient, and higher dissolved oxygen waters from the Pacific Ocean. 相似文献