Ocean Dynamics最新文献_第5页

Significant wave height estimation from shipborne marine radar data using convolutional and self-attention network 利用卷积和自我关注网络从船载海洋雷达数据中估算波高

IF 2.3 3区地球科学

Ocean Dynamics Pub Date : 2023-12-28 DOI: 10.1007/s10236-023-01591-7

Fupeng Wang, Xiaoliang Chu, Baoxue Zhang

{"title":"Significant wave height estimation from shipborne marine radar data using convolutional and self-attention network","authors":"Fupeng Wang, Xiaoliang Chu, Baoxue Zhang","doi":"10.1007/s10236-023-01591-7","DOIUrl":"https://doi.org/10.1007/s10236-023-01591-7","url":null,"abstract":"In this paper, a fusion model based on convolution and self-attention with multi-subimage input model (CNN-SA-MS) is proposed to estimate significant wave height (SWH) from shipborne X-band radar images. The model takes multiple radar subimages as input simultaneously, which not only improves the accuracy of SWH inversion by including more information, but also avoids the restriction of selecting a single subimage in the upwind direction and dependence on external devices for wind data provision. Based on the characteristics of radar images and computational efficiency considerations, this paper selects three radar subimages as the input for the model. The comparison data from buoys and ECMWF are used for training and testing. After averaging the results of 64 radar images, the root mean square error (RMSE) and correlation coefficient (CC) of the CNN-SA-MS model are 0.197 m and 0.903, respectively. The results show that the CNN-SA-MS model improves the accuracy and stability of SWH estimation compared to single-subimage CNN regression model. For the two time periods with significant discrepancies between radar data and ECMWF predictions, we introduce satellite altimeter information as a source of reference for evaluation. The resulting analysis indicates that the significant wave height estimates generated by CNN-SA-MS model are more reliable.","PeriodicalId":19387,"journal":{"name":"Ocean Dynamics","volume":"33 6 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139067467","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

Research on the methods for separating wind sea and swell from directional wave spectra in finite-depth waters 从有限深度水域定向波谱中分离风海和涌浪的方法研究

IF 2.3 3区地球科学

Ocean Dynamics Pub Date : 2023-12-19 DOI: 10.1007/s10236-023-01592-6

Zhenjun Zheng, Guohai Dong, Huawei Dong, Xiaozhou Ma, Mingfu Tang

{"title":"Research on the methods for separating wind sea and swell from directional wave spectra in finite-depth waters","authors":"Zhenjun Zheng, Guohai Dong, Huawei Dong, Xiaozhou Ma, Mingfu Tang","doi":"10.1007/s10236-023-01592-6","DOIUrl":"https://doi.org/10.1007/s10236-023-01592-6","url":null,"abstract":"Ocean waves are generally a mix of wind sea and swell. Given the significant disparities in their impact on engineering, the separation of wind sea and swell is of great significance for marine research and engineering applications. This work focuses on studying the methods for separating wind sea and swell from directional wave spectra in finite-depth waters (i.e., the south coast of Sri Lanka). The error caused by deep-water dispersion relationship in the identification of wind sea using wave age (WA) criterion in finite-depth waters is revealed. The magnitude of error increases with decreasing water depth and higher wind speeds. Subsequently, the impact of WA thresholds on the partitioned results of wind sea and swell is examined, followed by a summary on the procedure determining an appropriate WA threshold. Finally, effort is devoted to studying the overshoot phenomenon (OP) criterion, which does not rely on wind data. Overall, the OP criterion performs consistently with the WA criterion. However, the generation and dissipation of OP require some time. Therefore, the OP criterion exhibits a lag in capturing the growing wind sea as well as the transition of the wind sea to a young swell. Misclassification of wind sea by the OP criterion further contaminates the bulk parameters of swell. Moreover, when the wind direction changes slowly, the delays of OP-based wind sea become negligible, leading to improved identification of wind sea and swell.","PeriodicalId":19387,"journal":{"name":"Ocean Dynamics","volume":"8 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138742089","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

Seasonal and intraseasonal modulation of near-inertial wind power associated with fluctuations in unidirectional wind speed in the Bay of Bengal 与孟加拉湾单向风速波动相关的近惯性风力的季节和季节内调制

IF 2.3 3区地球科学

Ocean Dynamics Pub Date : 2023-12-14 DOI: 10.1007/s10236-023-01589-1

{"title":"Seasonal and intraseasonal modulation of near-inertial wind power associated with fluctuations in unidirectional wind speed in the Bay of Bengal","authors":"","doi":"10.1007/s10236-023-01589-1","DOIUrl":"https://doi.org/10.1007/s10236-023-01589-1","url":null,"abstract":"<h3>Abstract</h3> This study examines the seasonal and intraseasonal modulation of near-inertial wind power associated with fluctuations in unidirectional wind speed in the Bay of Bengal (BoB). For that purpose, we use concurrent measurements of high-resolution in situ near-surface current and wind speed from six moorings in the BoB. It is found that the annual mean of near-inertial wind power in the BoB shows roughly similar magnitude (0.25–0.35 mW m−2) at all the mooring locations. However, in response to the seasonal evolution of monsoonal wind forcing, near-inertial wind power shows significant annual variability, with a maximum during summer (~ 0.4–0.5 mW m−2) and fall (~ 0.3–0.4 mW m−2) and a minimum during winter (~ 0.1 mW m−2) and spring (~ 0.2 mW m−2). In addition, it is also found that modulation of near-inertial wind power due to summer monsoon intraseasonal oscillation (MISO), such as its magnitude, reaches as large as ~ 1 mW m−2 at the mooring in the northern BoB during phases 3–4 of MISO. Using a high vertical resolution of current profile data, the near-inertial kinetic energy (NIKE) budget in the mixed layer in the northern BoB shows good temporal correspondence with the magnitude of the rate of change of NIKE and near-inertial wind power, with a maximum magnitude of the rate of change of NIKE lags the wind power by 24 hr. The NIKE budget also indicates that a significant portion of near-inertial wind power dissipates in the mixed layer and rarely energises the depth regime underneath the mixed layer.","PeriodicalId":19387,"journal":{"name":"Ocean Dynamics","volume":"69 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138690415","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

The 12th International Workshop on Modeling the Ocean (IWMO 2022) in Ann Arbor, Michigan, USA on June 28–July 1, 2022 第 12 届国际海洋建模研讨会（IWMO 2022）将于 2022 年 6 月 28 日至 7 月 1 日在美国密歇根州安阿伯市举行

IF 2.3 3区地球科学

Ocean Dynamics Pub Date : 2023-12-14 DOI: 10.1007/s10236-023-01593-5

Jia Wang, T. Ezer, Ricardo de Camargo, Y. Miyazawa, Joanna Staneva, Fanghua Xu

引用次数: 0

Toxicity impacts on bioeconomic models of phytoplankton and zooplankton interactions 毒性对浮游植物和浮游动物相互作用生物经济模型的影响

IF 2.3 3区地球科学

Ocean Dynamics Pub Date : 2023-12-05 DOI: 10.1007/s10236-023-01588-2

Nossaiba Baba, Imane Agmour, Youssef El Foutayeni, Naceur Achtaich

引用次数: 0

Responses of the Pacific and Atlantic decadal variabilities under global warming by using CMIP6 models CMIP6模式对全球变暖下太平洋和大西洋年代际变化的响应

IF 2.3 3区地球科学

Ocean Dynamics Pub Date : 2023-12-05 DOI: 10.1007/s10236-023-01590-8

Yuyang Shang, Peng Liu, Sheng Wu

引用次数: 0

An Amundsen Sea source of decadal temperature changes on the Antarctic continental shelf 南极大陆架年代际温度变化的阿蒙森海源

IF 2.3 3区地球科学

Ocean Dynamics Pub Date : 2023-11-21 DOI: 10.1007/s10236-023-01587-3

Sybren S. Drijfhout, Christopher Y. S. Bull, Helene Hewitt, Paul R. Holland, Adrian Jenkins, Pierre Mathiot, Alberto Naveira Garabato

{"title":"An Amundsen Sea source of decadal temperature changes on the Antarctic continental shelf","authors":"Sybren S. Drijfhout, Christopher Y. S. Bull, Helene Hewitt, Paul R. Holland, Adrian Jenkins, Pierre Mathiot, Alberto Naveira Garabato","doi":"10.1007/s10236-023-01587-3","DOIUrl":"https://doi.org/10.1007/s10236-023-01587-3","url":null,"abstract":"Mass loss from the Antarctic Ice Sheet is dominated by basal melting–induced warm ocean water. Ice-sheet mass loss and thinning of buttressing ice shelves occur primarily in the Amundsen and Bellingshausen Seas. Here, we show that in a global ocean simulation using the 0.25° Nucleus for European Modeling of Ocean (NEMO) model driven by the JRA55 reanalysis from 1982 to 2017, the Amundsen sector of the Antarctic continental shelf acts as a gateway, regulating the on-shelf access of warm Circumpolar Deep Water (CDW) from the deep ocean and its westward transfer to other sectors up to ca. 90° E, particularly the Ross Sea. As a result, anomalies in Antarctic-shelf-averaged temperature mainly originate in the Amundsen sector. These changes are primarily governed by shifts in the Amundsen Sea Low associated with tropical climate variability, modulating the on-shelf transport of CDW via wind-driven perturbations to ocean currents. The ensuing temperature anomalies progress westward from the Amundsen Sea via three distinct routes: a slow, convoluted westward pathway on the shelf via the Antarctic Coastal Current; a faster westward pathway along the shelf break via the Antarctic Slope Current and then onto the shelf along topographic troughs; and a third, eastward route toward the Bellingshausen sector, whereby temperature anomalies are transported into a region of local wind-generated changes farther north. These results emphasize the importance of the Amundsen sector for climate variability over the Antarctic shelves.","PeriodicalId":19387,"journal":{"name":"Ocean Dynamics","volume":"12 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138509409","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

A three-layer model of hydrodynamic processes in the Cyprus Eddy system 塞浦路斯涡旋系统水动力过程的三层模型

IF 2.3 3区地球科学

Ocean Dynamics Pub Date : 2023-11-16 DOI: 10.1007/s10236-023-01584-6

Viktoriia M. Egorova, Mikhail A. Sokolovskiy, George Zodiatis

{"title":"A three-layer model of hydrodynamic processes in the Cyprus Eddy system","authors":"Viktoriia M. Egorova, Mikhail A. Sokolovskiy, George Zodiatis","doi":"10.1007/s10236-023-01584-6","DOIUrl":"https://doi.org/10.1007/s10236-023-01584-6","url":null,"abstract":"A three-layer quasi-geostrophic model was developed to examine the topographic eddies generated around the Eratosthenes Seamount in the southeastern Levantine basin, particularly the dipolar vortex structure, consisting of the anticyclonic Cyprus Eddy and a smaller-scale cyclone. The numerical experiments were carried out using the Contour Dynamics Method, imposing an eastward flow with different inclinations and intensities along the western boundary of the model domain to imitate the Mid-Mediterranean Jet. The dual nature of topographic eddies was previously reported to be generated frequently in a homogeneous ocean approximation, but in the current study, the consideration of baroclinicity primarily simulated a single vortex attributed to the Cyprus Eddy with the small-scale cyclone to be generated occasionally. Also, it was demonstrated that the direction and intensity of the imposed eastward flow along the western boundary of the model domain are the main factors in the formation of the cyclonic vortex. The modeling results showed a qualitative agreement with the geostrophic patterns derived from in-situ observations in the wider sea area of the Eratosthenes Seamount.","PeriodicalId":19387,"journal":{"name":"Ocean Dynamics","volume":"9 4","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138509396","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

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