Natural Variability and Warming Signals in Global Ocean Wave Climates

地球全体の波浪特性の変化傾向と自然変動の関係を解明 --地球温暖化の沿岸域への影響を定量化--. 京都大学プレスリリース. 2021-06-15.This paper presents a multivariate classification of the global wave climate into types driven by atmospheric circulation patterns. The primary source of the net long-term variability is evaluated based on historical wave simulations. Results show that the monsoon, extratropical, subtropical, and polar wave climate types of the Pacific and North Atlantic Oceans are dominated by natural variability, whereas the extratropical and subtropical wave climate types in the Indian Ocean, and the tropical wave climate types of the Atlantic and Pacific Oceans exhibit a global warming signal. In the Pacific sector of the Southern Ocean, strong natural variability may mask a global warming signal that is yet to emerge as being statistically significant. In addition, wave climate teleconnections were found across the world that can provide a framework for joint strategies to achieve the goals of climate adaption for resilient coastal communities and environments

Mechanical characterization of Ti(C,N)-based cermets fabricated through different colloidal processing routes

In this work the influence of different colloidal processing routes on the mechanical behavior of several Ti(C,N)-based cermets has been studied. The materials were designed with a Ti(C, N) content ranging between 80 and 85 vol %, in a Fe-Ni alloy matrix (with and without carbon addition). Three processing techniques were investigated: (i) Slip Casting (SC), (ii) Slip Casting + Cold Isostatic Pressing (SC+CIP), and (iii) Spray-Dry + Uniaxial Pressing (SDP). Biaxial strength distributions were determined in all samples using the ball-on-three-balls (B3B) method on disc-shaped specimens. Results were interpreted in the framework of Weibull theory. The characteristic strength ranged between 1090 MPa and 1870 MPa. A fractographic analysis performed on selected specimens showed different critical flaws, depending on the processing route, related to the composition and porosity level in each case. Single Edge V-Notched Beam (SEVNB) specimens fabricated with SDP were tested under 4-point-bending, in order to identify the effect of Fe-Ni content and carbon addition on their fracture resistance. Detailed fractographic analyses revealed slightly different mechanisms of fracture associated with the Fe-Ni and carbon content. Fracture toughness values ranging between similar to 12 and similar to 14 MPa m(1/2) were measured. Based upon these findings the SDP route is proposed to improve both the strength and toughness of Ti(C, N) cermets, which can be enhanced by the addition of carbon during the colloidal processing.The authors acknowledge the financial support from the Spanish Government through the projects MAT2015-70780-C4-1-P and MAT2015-70780-C4-2-P, and the Regional Government of Madrid through the program MULTIMAT-CHALLENGE, ref. S2013/MIT-2862. M.Dios acknowledges MINECO through the grant BES-2013-065760

Data for: Climate Drivers of Directional Wave Power on the Mexican Coast

This repository contains data of the article: Odériz, Itxaso; Silva, Rodolfo; Mortlock, Thomas; Mendoza, Edgar (2020), “Data for: Climate Drivers of Directional Wave Power on the Mexican Coast". Information is provided for the Mexican Coast with a 0.5º resolution in two folders: Folder 1) contains the monthly average of the parameters of wave power, mean wave direction, and components of the Wave Climate types (Extratropical Westerlies, Tropical Easterlies, and Subtropical Southerlies). Folder 2) contains the correlation coefficients between the wave parameters (wave power and wave direction; the time series were de-trended and the annual component removed) and the climate index ( ONI (Oceanic Nino Index) and PDO (Pacific Decadal Oscillation) and AMO (Atlantic Multi-decadal Oscillation))

Data for: ENSO Impacts on Global Wave Climate and Potential Coastal Hazards

This repository contains data of the article: Odériz, Itxaso; Silva, Rodolfo; Mortlock, Thomas; Mori, Nobuhito (2020), “ENSO Impacts on Global Wave Climate and Potential Coastal Hazards". Journal of Geophysical Reserach Oceans Information is provided for the ocean basins with a 0.5º resolution in three folders: Folder 1) contains the linear trends of monthly average of wave power and mean wave direction from 1985 to 2018. Folder 2) contains the correlation coefficients between the wave parameters (wave power and wave direction; the time series were de-trended and the annual component removed) and the climate index ( ONI (Oceanic Nino Index) and SOI (Southern Oscillation Index), MEI (Multivariate ENSO Index)and Niño3.4. Folder 3) Contains the coastal classification carried out using a K-mean clustering technique with R(MEI-Pw) and R(ME-Dir) input data

Data for: Natural Variability and Warming Signals in Global Ocean Wave Climates (2021) Geophysical Research Letters

This repository contains data of the article: Odériz, Itxaso; Silva, Rodolfo; Mortlock, Thomas; Mori, Nobuhito; Shimura, Tomoya; Webb, Adrean; Padilla-Hernández, Roberto; and Villers, Sofía, (2021), “Natural Variability and Warming Signals in Global Ocean Wave Climates ".Geophysical Research Letters The characteristics of the wave climate types are provided

Data for: Climate Drivers of Directional Wave Power on the Mexican Coast

This repository contains data of the article: Odériz, Itxaso; Silva, Rodolfo; Mortlock, Thomas; Mendoza, Edgar (2020), “Data for: Climate Drivers of Directional Wave Power on the Mexican Coast". Information is provided for the Mexican Coast with a 0.5º resolution in two folders: Folder 1) contains the monthly average of the parameters of wave power, mean wave direction, and components of the Wave Climate types (Extratropical Westerlies, Tropical Easterlies, and Subtropical Southerlies). Folder 2) contains the correlation coefficients between the wave parameters (wave power and wave direction; the time series were de-trended and the annual component removed) and the climate index ( ONI (Oceanic Nino Index) and PDO (Pacific Decadal Oscillation) and AMO (Atlantic Multi-decadal Oscillation)).THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

Data for: Natural Variability and Warming Signals in Global Ocean Wave Climates (2021) Geophysical Research Letters

This repository contains data of the article: Odériz, Itxaso; Silva, Rodolfo; Mortlock, Thomas; Mori, Nobuhito; Shimura, Tomoya; Webb, Adrean; Padilla-Hernández, Roberto; and Villers, Sofía, (2021), “Natural Variability and Warming Signals in Global Ocean Wave Climates ".Geophysical Research Letters The characteristics of the wave climate types are provided

Data for: ENSO Impacts on Global Wave Climate and Potential Coastal Hazards

This repository contains data of the article: Odériz, Itxaso; Silva, Rodolfo; Mortlock, Thomas; Mori, Nobuhito (2020), “ENSO Impacts on Global Wave Climate and Potential Coastal Hazards". Journal of Geophysical Reserach Oceans Information is provided for the ocean basins with a 0.5º resolution in three folders: Folder 1) contains the linear trends of monthly average of wave power and mean wave direction from 1985 to 2018. Folder 2) contains the correlation coefficients between the wave parameters (wave power and wave direction; the time series were de-trended and the annual component removed) and the climate index ( ONI (Oceanic Nino Index) and SOI (Southern Oscillation Index), MEI (Multivariate ENSO Index)and Niño3.4. Folder 3) Contains the coastal classification carried out using a K-mean clustering technique with R(MEI-Pw) and R(ME-Dir) input data

Editorial: Consequences of global change in coastal ecosystems from a multidisciplinary perspective

Ecosystems will play a key role in the future of our planet, as they are capable of great adaptabilty and are resilient to climate (e.g. Bulleri et al., 2018). However, they are also vulnerable to multifactorial disturbances (e.g. anthropic/Gómez et al., 2022). An ecosystem’s long-term response to global change (climate change, biodiversity loss, changes in water cycling, etc.) is also affected by the natural, epistemic, and aleatory uncertainty of the environment.The methods used to evaluate an ecosystem mean that the services it provides are difficult to quantify and predict. While ecosystem conservation strategies should come from a combination of different perspectives, they are commonly tackled via independent disciplines, such as coastal management, coastal engineering, ecology, water quality, etc. and therefore, insights into the long-term conservation of our ecosystems is still a key challenge. The starting point to address ecosystem conservation on a changing planet must be a multidisciplinary characterization of the physical and environmental context

Microstructural evolution and mechanical properties of the Ti-6Al-4V alloy produced by vacuum hot-pressing

In this work, the properties of the titanium industry workhorse, the Ti-6Al-4V alloy, processed by vacuum hot-pressing are studied. More in detail, relative density, microstructure characterisation and chemical analysis, precisely oxygen, nitrogen and carbon content, as well as flexural properties and hardness are considered. Components with relative density as high as 98% and mechanical properties similar to the wrought alloy, where these properties are affected by the formation of a reacted layer due to the interaction between titanium and the boron nitride (BN) coating, are obtained.The authors are thankful for the financial support from the Spanish Ministry of Education through the R&D Projects MAT2009- 14448-C02-02 and MAT2009-14547-C02-02 as well as from the Comunidad de Madrid through the ESTRUMAT (S-2009/MAT-1585) project.Publicad