Pub Date : 2022-11-21DOI: 10.1080/1755876x.2022.2147696
H. Ngodock, M. Carrier, J. Osborne, Scott R. Smith
{"title":"Nesting and data assimilation considerations in regional operational ocean forecasting","authors":"H. Ngodock, M. Carrier, J. Osborne, Scott R. Smith","doi":"10.1080/1755876x.2022.2147696","DOIUrl":"https://doi.org/10.1080/1755876x.2022.2147696","url":null,"abstract":"","PeriodicalId":50105,"journal":{"name":"Journal of Operational Oceanography","volume":"60 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2022-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88483590","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}
Pub Date : 2022-09-28DOI: 10.1080/1755876x.2022.2127232
L. Wyatt, J. Green
{"title":"Swell and wind-sea partitioning of HF radar directional spectra","authors":"L. Wyatt, J. Green","doi":"10.1080/1755876x.2022.2127232","DOIUrl":"https://doi.org/10.1080/1755876x.2022.2127232","url":null,"abstract":"","PeriodicalId":50105,"journal":{"name":"Journal of Operational Oceanography","volume":"177 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2022-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75387554","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}
Pub Date : 2022-07-25DOI: 10.1080/1755876x.2022.2102357
Justino Martínez, E. García-Ladona, J. Ballabrera‐Poy, J. Isern‐Fontanet, Sergio González-Motos, J. Allegue, C. González‐Haro
{"title":"Atlas of surface currents in the Mediterranean and Canary–Iberian–Biscay waters","authors":"Justino Martínez, E. García-Ladona, J. Ballabrera‐Poy, J. Isern‐Fontanet, Sergio González-Motos, J. Allegue, C. González‐Haro","doi":"10.1080/1755876x.2022.2102357","DOIUrl":"https://doi.org/10.1080/1755876x.2022.2102357","url":null,"abstract":"","PeriodicalId":50105,"journal":{"name":"Journal of Operational Oceanography","volume":"17 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86153662","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}
Pub Date : 2022-07-12DOI: 10.1080/1755876X.2022.2100145
Vinícius S. Pessanha, P. Chu, Matt K. Gough
ABSTRACT During the passage of two consecutive atmospheric cold fronts that migrated eastward along the northern Gulf of Mexico, currents, waves, and seafloor elevation were observed from instrumentation attached to a metal structure called ‘quadpod’ at the 7.5 m bathymetric contour off the coast of Panama City, Florida. During the passage of the first front, significant wave height (Hs) increased from 0.15 m to 1.2 m, and seafloor elevation relative to the quadpod increased by up to 5 cm at the quadpod location. During the passage of the second front, Hs peaked at 2 m, and seafloor elevation increased by up to 15 cm over 24 h. The increase in the seafloor elevation is consistent with the burial of surrogate munitions observed with sonar imagery and with sediment accretion from a Delft3D simulation. The model predicts cross-shore seafloor changes with erosion nearshore and accretion offshore, starting at approximately 250 m from the coast. The seafloor elevation increase is attributed to sediment accretion driven by wave forcing. The results of this study have important implications for morphological changes and object burial during a period of front-driven waves in the northern Gulf of Mexico, which is typically a lower energetic environment.
{"title":"Sediment accretion in a lower-energetic location during two consecutive cold fronts","authors":"Vinícius S. Pessanha, P. Chu, Matt K. Gough","doi":"10.1080/1755876X.2022.2100145","DOIUrl":"https://doi.org/10.1080/1755876X.2022.2100145","url":null,"abstract":"ABSTRACT During the passage of two consecutive atmospheric cold fronts that migrated eastward along the northern Gulf of Mexico, currents, waves, and seafloor elevation were observed from instrumentation attached to a metal structure called ‘quadpod’ at the 7.5 m bathymetric contour off the coast of Panama City, Florida. During the passage of the first front, significant wave height (Hs) increased from 0.15 m to 1.2 m, and seafloor elevation relative to the quadpod increased by up to 5 cm at the quadpod location. During the passage of the second front, Hs peaked at 2 m, and seafloor elevation increased by up to 15 cm over 24 h. The increase in the seafloor elevation is consistent with the burial of surrogate munitions observed with sonar imagery and with sediment accretion from a Delft3D simulation. The model predicts cross-shore seafloor changes with erosion nearshore and accretion offshore, starting at approximately 250 m from the coast. The seafloor elevation increase is attributed to sediment accretion driven by wave forcing. The results of this study have important implications for morphological changes and object burial during a period of front-driven waves in the northern Gulf of Mexico, which is typically a lower energetic environment.","PeriodicalId":50105,"journal":{"name":"Journal of Operational Oceanography","volume":"36 1","pages":"256 - 266"},"PeriodicalIF":3.1,"publicationDate":"2022-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76144051","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}
Pub Date : 2022-06-30DOI: 10.1080/1755876X.2022.2094633
D. Myrhaug, P. Lader
First, the discussers wish to compliment the authors, Aditya et al. (2022) (hereafter referred to as A22), on their results involving the development of a small vessel advisory and forecast services system for safe navigation and operation at sea for the Indian Ocean regime. These comments and discussion focus on the steepness index parameter (Is) used within the Small Vessel Advisory Services (SVAS) system (see Figure 3 in A22) and point out that regional wave statistics can be used to determine and review the properties of Is in relation to significant wave height, allowing a robust method for determining and quantifying warning thresholds. A22 used the steepness index as one of the three indices in the boat safety index (see Equation (6) in A22). The steepness index is given as
{"title":"Development of small vessel advisory and forecast services system for safe navigation and operations at sea by N.D. Aditya, K.G. Sandhya, R. Harikumar and T.M. Balakrishnan","authors":"D. Myrhaug, P. Lader","doi":"10.1080/1755876X.2022.2094633","DOIUrl":"https://doi.org/10.1080/1755876X.2022.2094633","url":null,"abstract":"First, the discussers wish to compliment the authors, Aditya et al. (2022) (hereafter referred to as A22), on their results involving the development of a small vessel advisory and forecast services system for safe navigation and operation at sea for the Indian Ocean regime. These comments and discussion focus on the steepness index parameter (Is) used within the Small Vessel Advisory Services (SVAS) system (see Figure 3 in A22) and point out that regional wave statistics can be used to determine and review the properties of Is in relation to significant wave height, allowing a robust method for determining and quantifying warning thresholds. A22 used the steepness index as one of the three indices in the boat safety index (see Equation (6) in A22). The steepness index is given as","PeriodicalId":50105,"journal":{"name":"Journal of Operational Oceanography","volume":"57 1","pages":"252 - 255"},"PeriodicalIF":3.1,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80689564","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}
Pub Date : 2022-04-05DOI: 10.1080/1755876x.2022.2059885
Sonaljit Mukherjee, S. Habtes, Paul Jobsis
{"title":"Comparative analysis of the performance of the GOFS, PSY4 and AMSEAS ocean model frameworks in the Virgin Islands and Puerto Rico coastal ocean","authors":"Sonaljit Mukherjee, S. Habtes, Paul Jobsis","doi":"10.1080/1755876x.2022.2059885","DOIUrl":"https://doi.org/10.1080/1755876x.2022.2059885","url":null,"abstract":"","PeriodicalId":50105,"journal":{"name":"Journal of Operational Oceanography","volume":"6 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2022-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74273891","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}
Pub Date : 2022-02-01DOI: 10.1080/1755876X.2021.2024949
S. B. S., Sashikant Nayak, V. Panchang
ABSTRACT Data from three satellites (JASON2, CRYOSAT, and SARAL/AltiKa) and two buoys were used to examine the performance of wind and wave forecasting models in the Persian Gulf. The quality of the satellite data was first examined by comparing them with buoy data. Wind speed data from all three satellites were found to be close to in situ measurements; for wave heights, SARAL/AltiKa data showed the best comparisons. Model forecasts and buoy data indicated correlation coefficients between 0.72 and 0.86 for wind speeds and 0.85–0.94 for wave heights. The forecast was more accurate at the open sea buoy than at the coastal buoy. Relative to SARAL/AltiKa data, which was preferred for assessing modelled wave heights, correlation coefficients were between 0.86 and 0.90. For modelled wind speeds, correlation coefficients with the consolidated satellite dataset were between 0.80 and 0.88. Some anomalous results were partly attributed to the exclusion of air–sea temperature differences. The likelihood of a given forecast representing a given sea state was estimated. Generally, for lead times up to 48 h, a user could have a 78–92% expectation that a SWH forecast > 1 m would lie within ±30% of a sea-state represented by the SARAL/AltiKa measurements.
{"title":"Performance assessment of a Persian Gulf wind and wave forecasting system","authors":"S. B. S., Sashikant Nayak, V. Panchang","doi":"10.1080/1755876X.2021.2024949","DOIUrl":"https://doi.org/10.1080/1755876X.2021.2024949","url":null,"abstract":"ABSTRACT Data from three satellites (JASON2, CRYOSAT, and SARAL/AltiKa) and two buoys were used to examine the performance of wind and wave forecasting models in the Persian Gulf. The quality of the satellite data was first examined by comparing them with buoy data. Wind speed data from all three satellites were found to be close to in situ measurements; for wave heights, SARAL/AltiKa data showed the best comparisons. Model forecasts and buoy data indicated correlation coefficients between 0.72 and 0.86 for wind speeds and 0.85–0.94 for wave heights. The forecast was more accurate at the open sea buoy than at the coastal buoy. Relative to SARAL/AltiKa data, which was preferred for assessing modelled wave heights, correlation coefficients were between 0.86 and 0.90. For modelled wind speeds, correlation coefficients with the consolidated satellite dataset were between 0.80 and 0.88. Some anomalous results were partly attributed to the exclusion of air–sea temperature differences. The likelihood of a given forecast representing a given sea state was estimated. Generally, for lead times up to 48 h, a user could have a 78–92% expectation that a SWH forecast > 1 m would lie within ±30% of a sea-state represented by the SARAL/AltiKa measurements.","PeriodicalId":50105,"journal":{"name":"Journal of Operational Oceanography","volume":"32 1","pages":"189 - 210"},"PeriodicalIF":3.1,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79284373","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}
Pub Date : 2021-11-24DOI: 10.1080/1755876X.2021.2000249
David Byrne, J. Polton, C. Bell
ABSTRACT The accurate prediction of tides is vital for the operation of many industries, early warning of coastal flooding and scientific understanding of ocean processes. In this paper, we describe the creation method of a global dataset of tidal harmonics using NEMO (Nucleus for European Modelling of the Ocean) for the first time and an offline objective analysis scheme. Data are assimilated as part of a post-processing step, reducing the computational resources required. A reduced ensemble of tidal harmonics is generated, where each member is run for a shorter period of time than a central background state. This ensemble is used to estimate a single background covariance state, which is used for analysis. Output is validated using an ensemble of objective analyses. For each ensemble member, random selections of observations are omitted and validation is performed at these locations. Improvements in both Mean Absolute Error (MAE) and correlation coefficients ( ) are seen across all 6 of the largest diurnal and semi-diurnal constituents. MAEs in amplitude and phase are reduced by up to and , respectively, and correlations by as much as 0.14. In addition, the majority of locations (between 70 and 80%) see significant improvement.
潮汐的准确预测对许多行业的运作、沿海洪水的早期预警和海洋过程的科学认识至关重要。本文介绍了首次使用NEMO (Nucleus for European Modelling of the Ocean)和离线客观分析方案创建全球潮汐谐波数据集的方法。数据作为后处理步骤的一部分被吸收，减少了所需的计算资源。产生了一个减少的潮汐谐波集合，其中每个成员运行的时间比中心背景状态短。该集合用于估计单个背景协方差状态，该状态用于分析。使用客观分析的集合来验证输出。对于每个集成成员，忽略随机选择的观察结果，并在这些位置执行验证。平均绝对误差(MAE)和相关系数()的改善在所有6个最大的日和半日成分中都可以看到。振幅和相位的MAEs分别减少了高达和，相关性减少了0.14。此外，大多数地区(在70%到80%之间)都看到了显著的改善。
{"title":"Creation of a global tide analysis dataset: Application of NEMO and an offline objective analysis scheme","authors":"David Byrne, J. Polton, C. Bell","doi":"10.1080/1755876X.2021.2000249","DOIUrl":"https://doi.org/10.1080/1755876X.2021.2000249","url":null,"abstract":"ABSTRACT The accurate prediction of tides is vital for the operation of many industries, early warning of coastal flooding and scientific understanding of ocean processes. In this paper, we describe the creation method of a global dataset of tidal harmonics using NEMO (Nucleus for European Modelling of the Ocean) for the first time and an offline objective analysis scheme. Data are assimilated as part of a post-processing step, reducing the computational resources required. A reduced ensemble of tidal harmonics is generated, where each member is run for a shorter period of time than a central background state. This ensemble is used to estimate a single background covariance state, which is used for analysis. Output is validated using an ensemble of objective analyses. For each ensemble member, random selections of observations are omitted and validation is performed at these locations. Improvements in both Mean Absolute Error (MAE) and correlation coefficients ( ) are seen across all 6 of the largest diurnal and semi-diurnal constituents. MAEs in amplitude and phase are reduced by up to and , respectively, and correlations by as much as 0.14. In addition, the majority of locations (between 70 and 80%) see significant improvement.","PeriodicalId":50105,"journal":{"name":"Journal of Operational Oceanography","volume":"9 2 1","pages":"175 - 188"},"PeriodicalIF":3.1,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78268141","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}
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