Journal of Oceanography最新文献_第2页

Sea ice-melt amount estimated from spring hydrography in the Sea of Okhotsk: spatial and interannual variabilities 根据鄂霍次克海春季水文地理学估算的海冰融化量：空间和年际变异性

IF 2.3 4区地球科学

Journal of Oceanography Pub Date : 2024-05-11 DOI: 10.1007/s10872-024-00721-z

Mariko Honda, Kay I. Ohshima, Vigan Mensah, Jun Nishioka, Masatoshi Sato, Stephen C. Riser

{"title":"Sea ice-melt amount estimated from spring hydrography in the Sea of Okhotsk: spatial and interannual variabilities","authors":"Mariko Honda, Kay I. Ohshima, Vigan Mensah, Jun Nishioka, Masatoshi Sato, Stephen C. Riser","doi":"10.1007/s10872-024-00721-z","DOIUrl":"https://doi.org/10.1007/s10872-024-00721-z","url":null,"abstract":"This study provides the first estimation of sea ice-melt amount in the Sea of Okhotsk based on spring hydrographic data accumulated for nearly a hundred years. Just after sea ice melts completely, a low-salinity layer appears on the ocean surface, overlying the layer of Winter Water at the freezing point. The integration of the salinity decrease from Winter Water should correspond to the total ice-melt amount. We developed an algorithm to extract the profiles that clearly show the salinity deficit and converted the salinity deficit to the ice-melt amount from all available data. The climatological map shows that ice-melt amount decreases toward the ice edge and exhibits large values around the northern Sakhalin Island, reflecting the ice thickness distribution. In the southern area (south of 48°N), where sea ice is transported from the north, the average ice-melt amount is estimated to be ~ 71 cm in thickness. It is clearly shown that the ice-melt amount has decreased by ~ 30% in the southern area since the 1990s. These changes possibly affect the regional climate through the decreased latent heat of sea ice and potentially affect biological production through weakened stratification caused by decreased ice melt. We also suggested that ice-melt amount did not show a significant trend during the 1930s–1970s, implying that our methodology could extract information on sea ice before the era of satellite observations.","PeriodicalId":16640,"journal":{"name":"Journal of Oceanography","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140932268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Temporal variation of the 2017 Kuroshio large meander based on repeated surveys along 138°E 基于沿东经 138 度反复勘测的 2017 年黑潮大蜿蜒的时间变化

IF 2.3 4区地球科学

Journal of Oceanography Pub Date : 2024-05-04 DOI: 10.1007/s10872-024-00718-8

Daiki Ito, Yugo Shimizu, Takashi Setou, Akira Kusaka, Daisuke Ambe, Yutaka Hiroe, Kiyotaka Hidaka, Sayaka Sogawa, Tamaha Yamaguchi

{"title":"Temporal variation of the 2017 Kuroshio large meander based on repeated surveys along 138°E","authors":"Daiki Ito, Yugo Shimizu, Takashi Setou, Akira Kusaka, Daisuke Ambe, Yutaka Hiroe, Kiyotaka Hidaka, Sayaka Sogawa, Tamaha Yamaguchi","doi":"10.1007/s10872-024-00718-8","DOIUrl":"https://doi.org/10.1007/s10872-024-00718-8","url":null,"abstract":"During August 2017, the Kuroshio began to follow its large meander (LM) path, and this was 12 years after the last LM event. Such LM events lead to the formation of an inshore cyclonic eddy (ICE) within the Kuroshio inshore region between the Kuroshio and the southern coast of Japan. We analyzed data from repeated seasonal surveys along a transect that followed 138°E, and from additional surveys, satellite observations, Argo floats, and a high-resolution reanalysis dataset to describe the temporal variation of the LM and ICE between 2017 and 2021. Cross sections from the repeated surveys highlighted the variations in the water mass structures. The time series of the indicators of the ICE intensity such as the Kuroshio volume transport and the planetary contribution of potential vorticity (Q) in the ICE revealed a maintenance trend in their intensity during the observation period. High-Q water was distributed in the ICE during the LM period compared to the non-LM period, and showed a clear seasonality within the shallower layers, suggesting the injection of Q via the advection from the upstream region in summer. Additional surveys captured an eddy that became detached from the ICE during summer 2020. This detached eddy had a Q value greater than the ICE and velocity similar to the Kuroshio, suggesting that the main stream had become temporarily separated. The structures and volume transport of warm water intrusions into the inshore region were also examined, and centrifugal instability was considered to be one of their generation mechanism.","PeriodicalId":16640,"journal":{"name":"Journal of Oceanography","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140885365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 variation in pore water nutrients and their fluxes from the bottom sediments in Harima Nada, Seto Inland Sea 濑户内海播磨滩孔隙水养分的季节变化及其从底层沉积物中的通量

IF 2.3 4区地球科学

Journal of Oceanography Pub Date : 2024-04-24 DOI: 10.1007/s10872-024-00719-7

M. Nakakuni, Hitomi Yamaguchi, K. Ichimi, K. Tada

引用次数: 0

Primary productivity impacts community structure of euphausiids in the low-latitude Indian and Pacific Oceans 初级生产力对低纬度印度洋和太平洋中的竹节虫群落结构的影响

IF 2.3 4区地球科学

Journal of Oceanography Pub Date : 2024-02-14 DOI: 10.1007/s10872-024-00713-z

{"title":"Primary productivity impacts community structure of euphausiids in the low-latitude Indian and Pacific Oceans","authors":"","doi":"10.1007/s10872-024-00713-z","DOIUrl":"https://doi.org/10.1007/s10872-024-00713-z","url":null,"abstract":"<h3>Abstract</h3> Euphausiids are a vital component of global marine micronekton. To reveal the primary environmental factors influencing euphausiid distribution patterns in the previously overlooked low-latitude ecosystems, we investigated a large-scale community structure of euphausiids covering the North Pacific subtropical gyre (NPSG) and low-latitude eastern Indian (EI), and South Pacific Oceans (SP). A total of 41 euphausiid species from six genera were identified. Integrated primary production (PP) correlated significantly with the euphausiid abundance and species diversity and displayed the most critical influence on the variations in euphausiid community structure in low latitudes. Dissolved oxygen (DO) was the second significant environmental driver. Due to the distinct distribution patterns of euphausiid species in response to different PP and DO levels, the low-latitude euphausiid assemblages were mainly distinguished into subtropical and tropical communities. The subtropical euphausiid community associated with lower PP and higher DO demonstrated significantly lower euphausiid abundance but higher diversity than the tropical community. Euphausia brevis, E. mutica, and Stylocheiron abbreviatum, which characterize the subtropical community, appear to depend less on the phytoplanktonic prey. Euphausia diomedeae and Hansarsia gracilis, typifying the tropical population, showed stronger hypoxia tolerance. Additionally, each community was further divided into three subgroups under the influence of surface PP (subtropical: marginal NPSG, central NPSG, and austral EI-SP subgroups; tropical: the Bay of Bengal, equatorial EI, and equatorial EI-SP subgroups). These results suggested that food resource is the most important in shaping euphausiids’ community structure in an oligotrophic ecosystem with subtle hydrography gradients.","PeriodicalId":16640,"journal":{"name":"Journal of Oceanography","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139766955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Correction to: Estimate of turbulent energy dissipation rate using free-fall and CTD-attached fast-response thermistors in weak ocean turbulence 更正：在弱海洋湍流中使用自由落体和 CTD 附加快速响应热敏电阻器估算湍流能量耗散率

IF 2.3 4区地球科学

Journal of Oceanography Pub Date : 2024-02-05 DOI: 10.1007/s10872-024-00717-9

Ichiro Yasuda, S. Fujio, D. Yanagimoto, KeungJong Lee, Yusuke Sasaki, Shuo Zhai, Mamoru Tanaka, S. Itoh, Takahiro Tanaka, Daisuke Hasegawa, Y. Goto, Daisuke Sasano

引用次数: 0

Correction to: Estimate of turbulent energy dissipation rate using free-fall and CTD-attached fast-response thermistors in weak ocean turbulence 更正：在弱海洋湍流中使用自由落体和 CTD 附加快速响应热敏电阻器估算湍流能量耗散率

IF 2.3 4区地球科学

Journal of Oceanography Pub Date : 2024-02-05 DOI: 10.1007/s10872-024-00717-9

Ichiro Yasuda, S. Fujio, D. Yanagimoto, KeungJong Lee, Yusuke Sasaki, Shuo Zhai, Mamoru Tanaka, S. Itoh, Takahiro Tanaka, Daisuke Hasegawa, Y. Goto, Daisuke Sasano

引用次数: 0

Future changes in marine heatwaves based on high-resolution ensemble projections for the northwestern Pacific Ocean 基于西北太平洋高分辨率集合预测的海洋热浪的未来变化

IF 2.3 4区地球科学

Journal of Oceanography Pub Date : 2024-01-31 DOI: 10.1007/s10872-024-00714-y

Yuma Kawakami, Hideyuki Nakano, L. Shogo Urakawa, Takahiro Toyoda, Kei Sakamoto, Shiro Nishikawa, Toru Sugiyama, Masao Kurogi, Yoichi Ishikawa, Katsunari Sato, Goro Yamanaka

{"title":"Future changes in marine heatwaves based on high-resolution ensemble projections for the northwestern Pacific Ocean","authors":"Yuma Kawakami, Hideyuki Nakano, L. Shogo Urakawa, Takahiro Toyoda, Kei Sakamoto, Shiro Nishikawa, Toru Sugiyama, Masao Kurogi, Yoichi Ishikawa, Katsunari Sato, Goro Yamanaka","doi":"10.1007/s10872-024-00714-y","DOIUrl":"https://doi.org/10.1007/s10872-024-00714-y","url":null,"abstract":"Marine heatwaves (MHWs) are oceanic conditions characterized by extremely high sea surface temperature (SST) anomalies that last for several days to years. Because MHWs have devastating effects on marine ecosystems and significant impacts on fisheries, understanding future MHWs is important for adapting to upcoming climate changes. In this study, we examined future changes in MHWs in the northwestern Pacific Ocean (18–53ºN, 117ºE–170ºW) under two CO2 emission scenarios using a high-resolution ensemble (four members for each scenario) simulation product using a high-resolution ocean model that satisfactorily resolves the Kuroshio, Kuroshio Extension, and SST fronts. Following global warming, MHWs based on a threshold in the historical period (1981–2005) will increase and intensify (i.e., occur with higher SST anomalies than before). In the historical period, the annual MHW days ranged from 20 to 34 days. Annual MHW days increase to 63–313 days (188 days–all year round) depending on the region under the high CO2 mitigation (emission) scenario at the end of the twenty-first century of 2076–2100. Furthermore, we investigated the spatial details of future MHWs. Future MHWs reflect the magnitude of SST variability in addition to that of sea surface warming in the twenty-first century; future MHWs are less frequent and more intense in the subtropical–subarctic frontal zone with large SST variability than in other regions.","PeriodicalId":16640,"journal":{"name":"Journal of Oceanography","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139646205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Correction to: Synchronized interdecadal variations behind regime shifts in the Pacific Decadal Oscillation Correction to：太平洋十年涛动制度转变背后的年代际同步变化

IF 2.3 4区地球科学

Journal of Oceanography Pub Date : 2024-01-31 DOI: 10.1007/s10872-024-00716-w

Masaki Hamamoto, Ichiro Yasuda

引用次数: 0

Spatial variability in wave characteristics along the eastern Arabian Sea 东阿拉伯海沿岸波浪特征的空间变异性

IF 2.3 4区地球科学

Journal of Oceanography Pub Date : 2024-01-22 DOI: 10.1007/s10872-024-00715-x

A. Anusree, M. M. Amrutha, V. Sanil Kumar

{"title":"Spatial variability in wave characteristics along the eastern Arabian Sea","authors":"A. Anusree, M. M. Amrutha, V. Sanil Kumar","doi":"10.1007/s10872-024-00715-x","DOIUrl":"https://doi.org/10.1007/s10872-024-00715-x","url":null,"abstract":"We utilized data from the numerical wave model WAVEWATCH-III and examined the spatial variability of waves considering 30 nearshore locations in the eastern Arabian Sea. The wave parameters from the model compare well with the buoy data (correlation coefficient ~ 0.98 and bias ~ 0.17 m). During monsoon, wave heights in the central-eastern Arabian Sea are higher than those in the southern and northern parts due to the influence of the Findlater jet and intermediate-period waves are dominating the entire area. The significant wave height is less than 1.5 m in non-monsoon and reaches 5 m in July. Variation in wave height between two nearby locations is highest in the northeastern Arabian Sea along the Gujarat coast. For a distance of 388 km from central Kerala to Karnataka, there is no significant spatial variability in wave height. Eastern Arabian Sea experiences a higher peak period in the non-monsoon due to reduction in the local wind speed. The integral period does not show significant spatial variability similar to wave height. The maximum (minimum) wave heights were found in 2013 (2015) and the variations are linked to the monsoon intensity.","PeriodicalId":16640,"journal":{"name":"Journal of Oceanography","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139551507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Dependence of drag coefficient on the spectral width of ocean waves 阻力系数与海浪频谱宽度的关系

IF 2.3 4区地球科学

Journal of Oceanography Pub Date : 2024-01-17 DOI: 10.1007/s10872-023-00712-6

Dongliang Zhao, Moxin Li

{"title":"Dependence of drag coefficient on the spectral width of ocean waves","authors":"Dongliang Zhao, Moxin Li","doi":"10.1007/s10872-023-00712-6","DOIUrl":"https://doi.org/10.1007/s10872-023-00712-6","url":null,"abstract":"The sea-surface roughness or drag coefficient is ascribed to the effect of various components of ocean waves. Many studies have been focused on the investigation of the dependence of drag coefficient on sea states that are usually denoted by wave age. However, no universally accepted relationship has been obtained up to now and the results are significantly scattered or even contradicted. We reviewed the parameterizations of sea-surface roughness as a function of wave age, and found that the phase speed at spectral peak cp is an important parameter to characterize the drag coefficient. For the same wave age, drag coefficient increases with increasing cp. Contrary to the traditional concept, the older waves with greater cp possesses higher sea-surface roughness for the same wind speed because more wave components participate the air–sea interaction and intensify the wind stress. With the buoy meansurements and the theory of equilibrium range of wind waves, we estimated fricition velocity and proposed that the frequency bandwidth and spectral width of the wave spectrum are more suitable parameters than the traditional wind speed and wave age to be used to parameterize drag coefficient. This study provides a new way to estimate wind stress through the reliable spectra of ocean waves.","PeriodicalId":16640,"journal":{"name":"Journal of Oceanography","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139499580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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