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How deep ocean-land coupling controls the generation of secondary microseism Love waves

Abstract.

"Wind driven ocean wave-wave interactions produce continuous Earth vibrations at the seafloor called secondary microseisms. While the origin of associated Rayleigh waves is well understood, there is currently no quantified explanation for the existence of Love waves in the most energetic region of the microseism spectrum (3–10 s). Here, using terrestrial seismic arrays and 3D synthetic acoustic-elastic simulations combined with ocean wave hindcast data, we demonstrate that, observed from land[...]"

 

Source: Nature Communications
Authors: Florian Le Pape et al.
DOI: https://doi.org/10.1038/s41467-021-22591-5

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A committed fourfold increase in ocean oxygen loss

Abstract.

"Less than a quarter of ocean deoxygenation that will ultimately be caused by historical CO2 emissions is already realized, according to millennial-scale model simulations that assume zero CO2 emissions from year 2021 onwards. About 80% of the committed oxygen loss occurs below 2000 m depth, where a more sluggish overturning circulation will increase water residence times and accumulation of respiratory oxygen demand. According to the model results, the deep ocean will thereby lose more than 10% of its pre-industrial oxygen content even if CO2 emissions and thus global warming[...]"

 

Source: Nature Communications
Authors: Andreas Oschlies 
DOI: https://doi.org/10.1038/s41467-021-22584-4

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A pole-to-equator ocean ousverturning circulation on Encelad

Abstract.

"Enceladus is believed to have a saltwater global ocean, heated at the ocean–core interface and losing heat to the floating ice shell above. This configuration suggests an important role for vertical convection. The ice shell has dramatic meridional thickness variations that, in steady state, must be sustained by the ocean circulation against processes acting to remove these anomalies. This could be achieved through spatially separated regions of freezing and melting at the ocean–ice interface. Here, we use an idealized[...]"

 

Source: Nature Geoscience
Authours: Ana H. Lobo et al.
DOI: https://doi.org/10.1038/s41561-021-00706-3

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Iron isotopes trace primordial magma ocean cumulates melting in Earth’s upper mantle

Abstract.

"The differentiation of Earth ~4.5 billion years (Ga) ago is believed to have culminated in magma ocean crystallization, crystal-liquid separation, and the formation of mineralogically distinct mantle reservoirs. However, the magma ocean model remains difficult to validate because of the scarcity of geochemical tracers of lower mantle mineralogy. The Fe isotope compositions (δ57Fe) of ancient mafic rocks can be used to reconstruct the mineralogy of their mantle source regions. We present Fe isotope data for 3.7-Ga metabasalts from the Isua Supracrustal Belt (Greenland). The δ57Fe signatures[...]"

 

Source: Science Advances
Authors: Helen M. Williams et al.
DOI:10.1126/sciadv.abc7394

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Opposite response of strong and moderate positive Indian Ocean Dipole to global warming

Abstract.

"A strong positive Indian Ocean Dipole (pIOD) induces weather extremes such as the 2019 Australian bushfires and African floods. The impact is influenced by sea surface temperature (SST), yet models disagree on how pIOD SST may respond to greenhouse warming. Here we find increased SST variability of strong pIOD events, with strong equatorial eastern Indian Ocean cool anomalies, but decreased variability of moderate pIOD events, dominated by western warm anomalies[...]"

 

Source: Nature Climate Change
Authors: Wenju Cai et al.
DOI: https://doi.org/10.1038/s41558-020-00943-1

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An integrated framework for lean manufacturing in relation with blue ocean manufacturing - A case study

Abstract.

"Lean Manufacturing (LM) has traditionally helped industries in removing the non-value-added processes to achieve operational excellence. Similarly, the blue ocean strategy helps organizations in creating an uncontested market space where the competition is irrelevant. The authors posit that the integration of two approaches helps in achieving holistic manufacturing excellence, and there is a paucity of approaches that integrate the two paradigms. In order to fill this research gap, the authors have developed an integrated framework that combines the concepts of lean[...]"

 

Source: Science Direct
Authors: Saba Sadiq et al.
DOI: https://doi.org/10.1016/j.jclepro.2020.123790

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Protecting the global ocean biodiversity, food and climate

Abstract.

"The ocean contains unique biodiversity, provides valuable food resources and is a major sink for anthropogenic carbon. Marine protected areas (MPAs) are an effective tool for restoring ocean biodiversity and ecosystem services1,2, but at present only 2.7% of the ocean is highly protected3. This low level of ocean protection is due largely to conflicts with fisheries and other extractive uses. To address this issue, here we developed a conservation planning framework to prioritize highly protected MPAs in places that would result in multiple benefits today and in the future. We find that a substantial increase in ocean protection could have triple benefits, by protecting biodiversity[...]"

 

Source: Nature
Authors: Enric Sala et al.
DOI: https://doi.org/10.1038/s41586-021-03371-z

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Role of tide-induced vertical mixing in the deep Pacific Ocean circulation

Abstract.

"We investigate the control mechanisms of the deep Pacific Ocean circulation by introducing updated methods for parameterizing tidal mixing. The column-integrated rates of dissipation in near- and far-fields are derived from the tidal energy conversion and dissipation rates estimated by a high resolution tide model. In the calculation of the far-field mixing, its dependency on stratification is taken into account based on theoretical and observational knowledge.Unlike previous studies that did not take the stratification dependence into account, the far-field mixing does not function to significantly enhance the deep Pacific Ocean circulation. The deep Pacific Ocean circulation is also found to be insensitive to the decay scale height of the near-field mixing. However, these factors affect the reproducibility of the[...]"

 

Source: Journal of Oceanography
Authors: Takao Kawasaki et al.
DOI: https://doi.org/10.1007/s10872-020-00584-0

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Atlantic Ocean science diplomacy in action: the pole-to-pole All Atlantic Ocean Research Alliance

Abstract.

"The ocean provides important ecosystem services to society, but its health is in crisis due to the impacts of human activities. Ocean sustainability requires ambitious levels of scientific evidence to support governance and management of human activities that impact the ocean. However, due to the size, complexity and connectivity of the ocean, monitoring and data collection presupposes high investments, and nations need to cooperate to deliver the ambitious, costly science that is required to inform decisions[...]"

 

Source: Nature - Humanities and Social Sciences Communications
Authors: Andrei Polejack et al.
DOI: https://doi.org/10.1057/s41599-021-00729-6

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Emerging Solutions to Return Nature to the Urban Ocean

Abstract.

"Urban and periurban ocean developments impact 1.5% of the global exclusive economic zones, and the demand for ocean space and resources is increasing. As we strive for a more sustainable future, it is imperative that we better design, manage, and conserve urban ocean spaces for both humans and nature. We identify three key objectives for more sustainable urban oceans: reduction of urban pressures, protection and restoration of ocean ecosystems, and support of critical ecosystem services. We describe an array of emerging evidence-based approaches, including greening grayinfrastructure, restoring habitats, and developing biotechnologies.

 

Source: ANNUAL REVIEWS
Authors: Laura Airoldi et al.
DOI: https://doi.org/10.1146/annurev-marine-032020-020015

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