Ocean Dynamics最新文献_第6页

Link between the internal variability and the baroclinic instability in the Bohai and Yellow Sea 渤海和黄海内部变率与斜压不稳定的关系

3区地球科学

Ocean Dynamics Pub Date : 2023-11-13 DOI: 10.1007/s10236-023-01583-7

Lin Lin, Hans von Storch, Xueen Chen, Wensheng Jiang, Shengquan Tang

{"title":"Link between the internal variability and the baroclinic instability in the Bohai and Yellow Sea","authors":"Lin Lin, Hans von Storch, Xueen Chen, Wensheng Jiang, Shengquan Tang","doi":"10.1007/s10236-023-01583-7","DOIUrl":"https://doi.org/10.1007/s10236-023-01583-7","url":null,"abstract":"Abstract A regional ocean ensemble simulation with slightly different initial conditions demonstrates that internal variability is formed (not only) in the Bohai and Yellow Sea. In this paper, we analyze the relationship between the internal variability and the baroclinic instability, (represented by the Eady predicted theoretical diffusivity $${K}_{t}$$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:msub> <mml:mi>K</mml:mi> <mml:mi>t</mml:mi> </mml:msub> </mml:math> ; the larger the $${K}_{t}$$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:msub> <mml:mi>K</mml:mi> <mml:mi>t</mml:mi> </mml:msub> </mml:math> , the stronger the baroclinic instability level). In the ensemble, with tidal forcing, the spatial correlation between the Eady predicted theoretical diffusivity $${K}_{t}$$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:msub> <mml:mi>K</mml:mi> <mml:mi>t</mml:mi> </mml:msub> </mml:math> and the internal variability amounts to 0.80. Also, the time evolution trends of baroclinic instability and internal variability are similar. Based on this evidence, baroclinic instability may be a significant driver for internal variability. This hypothesis is validated using an additional ensemble of simulations, which is identical to the first ensemble, but this time, the tides are inactivated. This modification leads to an increase in internal variability, combined with the strengthening of baroclinic instability. In addition, the baroclinic instability level and internal variability variation co-vary consistently when comparing summer and winter seasons, both with and without tides. Our interpretation is that a stronger baroclinic instability causes more potential energy to be transformed into kinetic energy, allowing the unforced disturbances to grow.","PeriodicalId":19387,"journal":{"name":"Ocean Dynamics","volume":"48 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136346374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Statistical properties of extreme waves in multidirectional wave fields over complex bathymetry 复杂测深上多向波场极值波的统计性质

3区地球科学

Ocean Dynamics Pub Date : 2023-11-11 DOI: 10.1007/s10236-023-01586-4

Lili Mei, Hongzhou Chen, Xu Yang, Fukun Gui

引用次数: 0

Direct observations of general geothermal convection in deep Mediterranean waters 地中海深水一般地热对流的直接观测

3区地球科学

Ocean Dynamics Pub Date : 2023-11-10 DOI: 10.1007/s10236-023-01585-5

Hans van Haren

引用次数: 0

Interannual sea-level variation around mainland Japan forced by subtropical North Pacific wind and its possible impact on the Tsugaru warm current 副热带北太平洋风对日本大陆周边海平面的年际变化及其对津garu暖流的可能影响

3区地球科学

Ocean Dynamics Pub Date : 2023-11-09 DOI: 10.1007/s10236-023-01580-w

Akira Nagano, Hitoshi Kaneko, Masahide Wakita

引用次数: 0

On the relative role of east and west pacific sea surface temperature (SST) gradients in the prediction skill of Central Pacific NINO3.4 SST 东、西太平洋海温梯度在中太平洋NINO3.4海温预报中的相对作用

3区地球科学

Ocean Dynamics Pub Date : 2023-11-02 DOI: 10.1007/s10236-023-01581-9

S. Lekshmi, Rajib Chattopadhyay, D. S. Pai, M. Rajeevan, Vinu Valsala, K. S. Hosalikar, M. Mohapatra

引用次数: 0

The dynamic mechanism of rapid sediment deposition in the mangrove region of the Guangxi Beibu Gulf 广西北部湾红树林区快速泥沙沉积的动力机制

3区地球科学

Ocean Dynamics Pub Date : 2023-11-01 DOI: 10.1007/s10236-023-01579-3

Jingsong Gao, Ling Chen, Hanfang Lu, Xiaoni Meng, Xuefeng Cao, Dapeng Wang, Lingling Xie, KitYue Kwan, Baoqing Hu

引用次数: 0

Evaluation of seagrass as a nature-based solution for coastal protection in the German Wadden Sea 海草作为德国瓦登海海岸保护的自然解决方案的评价

3区地球科学

Ocean Dynamics Pub Date : 2023-10-18 DOI: 10.1007/s10236-023-01577-5

Benjamin Jacob, Tobias Dolch, Andreas Wurpts, Joanna Staneva

{"title":"Evaluation of seagrass as a nature-based solution for coastal protection in the German Wadden Sea","authors":"Benjamin Jacob, Tobias Dolch, Andreas Wurpts, Joanna Staneva","doi":"10.1007/s10236-023-01577-5","DOIUrl":"https://doi.org/10.1007/s10236-023-01577-5","url":null,"abstract":"Abstract Global climate change increases the overall risks for coastal flooding and erosion. Meanwhile, nature-based solutions (NbS) are increasingly becoming a focus of coastal protection measures to improve the climate adaptability. In this study, the present and potential future role of seagrass in coastal risk reduction strategies were explored for the highly energetic Wadden Sea area of the German Bight. The methodology in this study combined seagrass coverage data ( Zostera marina and Zostera noltei ) obtained by field surveys and what-if scenario simulations using the SCHISM unstructured grid model framework, coupling hydrodynamics, waves, sediments, and a seagrass module. The results suggest that the introduction of seagrass meadows locally can reduce both current velocities and significant wave heights in the order of up to 30 $$%$$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:mo>%</mml:mo> </mml:math> in the deeper areas and above 90 $$%$$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:mo>%</mml:mo> </mml:math> in the shallow areas. Reduction in bottom shear stress of a similar relative magnitude significantly reduced sediment mobilisation on the order of 2 g/L in the 95th quantile of bottom layer sediment concentrations. Effectively altering hydromorphodynamic conditions favouring sediment accumulation, seagrass expansion could help tidal flats height growths to keep up with SLR, thus further maintaining the bathymetry-induced tidal dampening and lowering flooding and erosion risks as well the amount of energy at dike infrastructure. The accumulated effect of seagrass under calm weather conditions is considered more important than the increased attenuation in absolute values it provides during extreme conditions. The overall conclusion is that seagrass expansion could be a useful addition to engineered coastal protection measures.","PeriodicalId":19387,"journal":{"name":"Ocean Dynamics","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135824253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Changes in extreme wave events in the southwestern South Atlantic Ocean 南大西洋西南部极端波浪事件的变化

3区地球科学

Ocean Dynamics Pub Date : 2023-10-07 DOI: 10.1007/s10236-023-01575-7

Carolina B. Gramcianinov, Joanna Staneva, Ricardo de Camargo, Pedro L. da Silva Dias

{"title":"Changes in extreme wave events in the southwestern South Atlantic Ocean","authors":"Carolina B. Gramcianinov, Joanna Staneva, Ricardo de Camargo, Pedro L. da Silva Dias","doi":"10.1007/s10236-023-01575-7","DOIUrl":"https://doi.org/10.1007/s10236-023-01575-7","url":null,"abstract":"Abstract The southwestern South Atlantic (SWSA) has faced several extreme events that caused coastal and ocean hazards associated with high waves. This study aimed to investigate the extreme wave climate trends in the SWSA using percentile- and storm-based approaches to determine potential coastal impacts. Changes in extreme wave event characteristics were evaluated through distribution maps and directional density distributions. Our results showed an overall increase in the 95 $$^{th}$$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:msup> <mml:mrow /> <mml:mrow> <mml:mi>th</mml:mi> </mml:mrow> </mml:msup> </mml:math> -percentile of the significant wave height (Hs), mostly in the northern and southern portions of the domain. There was a general increase in the area affected by the events and in their lifetimes in the austral summer. In contrast, winter events had higher maximum intensities, which were not homogeneous throughout the domain. Changes in the wave power direction affected most of the analysed locations, showing a clockwise shift of summer events and a large directional spread of events from the southern quadrant (SW–SE). These changes were related to the southwards shift of the subtropical branch of the storm track, reflecting increased cyclonic activity at 30 $$^circ $$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:msup> <mml:mrow /> <mml:mo>∘</mml:mo> </mml:msup> </mml:math> S (summer) and 45 $$^circ $$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:msup> <mml:mrow /> <mml:mo>∘</mml:mo> </mml:msup> </mml:math> S (winter). These storm track shifts allowed the development of large fetches on the southern edge of the domain, promoting the propagation of long waves.","PeriodicalId":19387,"journal":{"name":"Ocean Dynamics","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135253356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A study of the simulated climatological January mean upwelling in the northwestern Gulf of Alaska 对阿拉斯加湾西北部一月平均上升流的模拟气候研究

3区地球科学

Ocean Dynamics Pub Date : 2023-10-04 DOI: 10.1007/s10236-023-01578-4

Nan Yuan, Humio Mitsudera, Hideharu Sasaki

{"title":"A study of the simulated climatological January mean upwelling in the northwestern Gulf of Alaska","authors":"Nan Yuan, Humio Mitsudera, Hideharu Sasaki","doi":"10.1007/s10236-023-01578-4","DOIUrl":"https://doi.org/10.1007/s10236-023-01578-4","url":null,"abstract":"Abstract In this research, we studied the upwelling in the northwestern Gulf of Alaska using the climatological January mean and data from the output of the Ocean General Circulation Model for Earth Simulator (OFES2). Specifically, we analyzed the upwelling in the regions where the Alaska Coastal Current (ACC) flows out of the Shelikof Strait (especially the part to the west of Kodiak Island) and where the ACC and the Alaskan Stream (AS) are confluent. In both regions, strong geostrophic currents and downwelling-favorable wind predominate in winter. Furthermore, there are freshwater discharges along the Alaskan coast and an observed mean current vertical shear in the ACC. We revealed that when the internal water stress is larger than the wind stress inside the study regions, this could be decisive in terms of the local horizontal velocity divergence and further upwelling, even if the region is away from the coast and lacks upwelling-favorable wind conditions. Geostrophic stress is part of the internal water stress and is a product of the geostrophic current shear (due to the thermal wind relation) and the vertical viscosity coefficient. The analysis indicated that a front with a large geostrophic stress may act as a “virtual wall” and contribute to local upwelling within a depth of approximately 100 m in the study regions. This process could provide a heuristic for understanding the distribution of pollock in the areas during February and March, which corresponds to the simulated upwelling region.","PeriodicalId":19387,"journal":{"name":"Ocean Dynamics","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135592560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Three-dimensional structure of summer circulation in the Bohai Sea and its intraseasonal variability 渤海夏季环流三维结构及其季内变率

3区地球科学

Ocean Dynamics Pub Date : 2023-09-30 DOI: 10.1007/s10236-023-01576-6

Wenfan Wu, Fangguo Zhai, Cong Liu, Yanzhen Gu, Peiliang Li

引用次数: 0