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- 2019
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Tidskriftsartikel (refereegranskat)
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| 3. |
- Yang, Kunpeng, et al.
(författare)
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North Atlantic Ocean–Originated Multicentennial Oscillation of the AMOC : A Coupled Model Study
- 2024
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Ingår i: Journal of Climate. - 0894-8755 .- 1520-0442. ; 37:9, s. 2789-2807
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Tidskriftsartikel (refereegranskat)abstract
- Using a CESM1 control simulation, we conduct a follow-up study to advance our earlier theoretical research on the multicentennial oscillation (MCO) of the Atlantic meridional overturning circulation (AMOC). The modeled AMOC MCO primarily arises from internal oceanic processes in the North Atlantic, potentially representing a North Atlantic Ocean–originated mode of AMOC multicentennial variability (MCV) in reality. Specifically, this AMOC MCO is mainly driven by salinity variation in the subpolar upper North Atlantic, which dominates local density variation. Salinity anomaly in the subpolar upper ocean is enhanced by the well-known positive salinity advection feedback that is realized through anomalous advection in the subtropical to subpolar upper ocean. Meanwhile, mean advection moves salinity anomaly in the subtropical intermediate ocean northward, weakening the subpolar upper salinity anomaly and leading to its phase change. The salinity anomalies have a clear three-dimensional life cycle around the North Atlantic. The mechanism and time scale of the modeled AMOC MCO are consistent with our earlier theoretical studies. In the theoretical model, artificially deactivating either the anomalous or mean advection in the AMOC upper branch prevents it from exhibiting AMOC MCO, underscoring the indispensability of both the anomalous and mean advections in this North Atlantic Ocean–originated AMOC MCO. In our coupled model simulation, the South Atlantic and Southern Oceans do not exhibit variabilities synchronous with the AMOC MCO; the Arctic Ocean’s contribution to the subpolar upper salinity anomaly is much weaker than the North Atlantic. Hence, this North Atlantic Ocean–originated AMOC MCO is distinct from the previously proposed Southern Ocean–originated and Arctic Ocean–originated AMOC MCOs.
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| 4. |
- Wang, Fang, et al.
(författare)
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Emerging contaminants: A One Health perspective
- 2024
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Ingår i: Innovation. - 2666-6758. ; 5
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Forskningsöversikt (refereegranskat)abstract
- Environmental pollution is escalating due to rapid global development that often prioritizes human needs over planetary health. Despite global efforts to mitigate legacy pollutants, the continuous introduction of new substances remains a major threat to both people and the planet. In response, global initiatives are focusing on risk assessment and regulation of emerging contaminants, as demonstrated by the ongoing efforts to establish the UN's Intergovernmental Science-Policy Panel on Chemicals, Waste, and Pollution Prevention. This review identifies the sources and impacts of emerging contaminants on planetary health, emphasizing the importance of adopting a One Health approach. Strategies for monitoring and addressing these pollutants are discussed, underscoring the need for robust and socially equitable environmental policies at both regional and international levels. Urgent actions are needed to transition toward sustainable pollution management practices to safeguard our planet for future generations.
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| 5. |
- Yang, Haijun, et al.
(författare)
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多百年际气候变率 : 观测、理论与模拟研究 [Multi-centennial climate variability: Observational, theoretical and modeling studies]
- 2023
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Ingår i: Chinese Science Bulletin. - 0023-074X .- 2095-9419. ; 68:16, s. 2037-2045
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Tidskriftsartikel (refereegranskat)abstract
- Research using long-term proxy data suggests the existence of multi-centennial climate variability in the Earth’s climate system. Its origin and mechanism have been bewildering for climatologists and archaeologists for a long time. Considering that the variation of external forcing of the Earth’ climate was relatively small from the mid-Holocene to the pre-industrial time, it is important to investigate the role of internal natural oscillation of the climate system during this period. The Atlantic meridional overturning circulation (AMOC) is thought to be the first candidate for such multi-centennial timescale variability. It is thus critical to investigate systematically the connection between the AMOC and the Earth climate system at this timescale. From the mid-Holocene to the pre-industrial time, the human civilization experienced rapid development. Historical documents in China suggest that in the past 2000 years, the historical climate in China had a low-frequency variation with 200–300 year period, which might have affected the ancient Chinese civilization. The multi-centennial variability of the AMOC may have played a role in the vax and vane of the human civilization.Currently, there is a lack of in-depth studies on the multi-centennial variability of the AMOC. This is mainly due to the following factors. First, the time period of modern instrumental observations is less than 200 years, which is not long enough to confirm the existence of the multi-centennial climate variability. Second, there is a lack of a well-recognized theory that can account for the multi-centennial variability of the AMOC. Third, it is much easier for a researcher to study the Earth climate change due to external forcing than to study the internal variability of the Earth climate system under a stable external forcing, particularly at this long timescale.Several coupled Earth climate system models have simulated the multi-centennial variability of the AMOC. However, the results from both coupled models and proxy data include comprehensive factors. To fundamentally understand the multi-centennial climate variability, a simple theoretical model is needed. Unfortunately, there is a lack of theoretical studies on the internal multi-centennial variability under the background of stable climate.In this work, we systematically review the current studies on multi-centennial climate variability from observational, theoretical and coupled modeling aspects. We hope that by proposing innovative theory and creative climate modeling approach, we can identify the intrinsic mode of multi-centennial climate variability, picture its spatial pattern, decipher the origin of its timescale, and reveal its internal mechanism. The outcome of these studies will help us understand deeply the wax and wane of the human civilization during the past several thousand years. It will also be of great significance for a better prediction of the long-term trend of future climate change.
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| 6. |
- Cao, Ning, 1987-, et al.
(författare)
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The role of internal feedbacks in sustaining multi-centennial variability of the Atlantic Meridional Overturning Circulation revealed by EC-Earth3-LR simulations
- 2023
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Ingår i: Earth and Planetary Science Letters. - 0012-821X .- 1385-013X. ; 621
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Tidskriftsartikel (refereegranskat)abstract
- A significant multi-centennial climate variability with a distinct peak at approximately 200 years is observed in a pre-industrial (PI) control simulation using the EC-Earth3-LR climate model. This oscillation originates predominately from the North Atlantic and displays a strong association with the Atlantic Meridional Overturning Circulation (AMOC). Our study identifies the interplay between salinity advection feedback and vertical mixing in the subpolar North Atlantic as key roles in providing the continues internal energy source to maintain this multi-centennial oscillation. The perturbation flow of mean subtropical-subpolar salinity gradients serves as positive feedback to sustain the AMOC anomaly, while the mean advection of salinity anomalies and the vertical mixing or convection acts as negative feedback, constraining the AMOC anomaly. Notably, this low-frequency variability persists even in a warmer climate with weakened AMOC, emphasizing the robustness of the salinity advection feedback mechanism.
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| 7. |
- Chen, Wenju, et al.
(författare)
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Porous cellulose diacetate-SiO2 composite coating on polyethylene separator for high-performance lithium-ion battery
- 2016
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Ingår i: Carbohydrate Polymers. - : Elsevier BV. - 0144-8617 .- 1879-1344. ; 147, s. 517-524
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Tidskriftsartikel (refereegranskat)abstract
- The developments of high-performance lithium ion battery are eager to the separators with high ionic conductivity and thermal stability. In this work, a new way to adjust the comprehensive properties of inorganic-organic composite separator was investigated. The cellulose diacetate (CDA)-SiO2 composite coating is beneficial for improving the electrolyte wettability and the thermal stability of separators. Interestingly, the pore structure of composite coating can be regulated by the weight ratio of SiO2 precursor tetraethoxysilane (TEOS) in the coating solution. The electronic performance of lithium ion batteries assembled with modified separators are improved compared with the pristine PE separator. When weight ratio of TEOS in the coating solution was 9.4%, the composite separator shows the best comprehensive performance. Compared with the pristine PE separator, its meltdown temperature and the break-elongation at elevated temperature increased. More importantly, the discharge capacity and the capacity retention improved significantly.
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| 8. |
- Gravgaard Askjær, Thomas, et al.
(författare)
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Multi-centennial Holocene climate variability in proxy records and transient model simulations
- 2022
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Ingår i: Quaternary Science Reviews. - : Elsevier BV. - 0277-3791 .- 1873-457X. ; 296
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Tidskriftsartikel (refereegranskat)abstract
- Variability on centennial to multi-centennial timescales is mentioned as a feature in reconstructions of the Holocene climate. As more long transient model simulations with complex climate models become available and efforts have been made to compile large proxy databases, there is now a unique opportunity to study multi-centennial variability with greater detail and a large amount of data than earlier. This paper presents a spectral analysis of transient Holocene simulations from 9 models and 120 proxy records to find the common signals related to oscillation periods and geographic dependencies and discuss the implications for the potential driving mechanisms. Multi-centennial variability is significant in most proxy records, with the dominant oscillation periods around 120–130 years and an average of 240 years. Spectra of model-based global mean temperature (GMT) agree well with proxy evidence with significant multi-centennial variability in all simulations with the dominant oscillation periods around 120–150 years. It indicates a comparatively good agreement between model and proxy data. A lack of latitudinal dependencies in terms of oscillation period is found in both the model and proxy data. However, all model simulations have the highest spectral density distributed over the Northern hemisphere high latitudes, which could indicate a particular variability sensitivity or potential driving mechanisms in this region. Five models also have differentiated forcings simulations with various combinations of forcing agents. Significant multi-centennial variability with oscillation periods between 100 and 200 years is found in all forcing scenarios, including those with only orbital forcing. The different forcings induce some variability in the system. Yet, none appear to be the predominant driver based on the spectral analysis. Solar irradiance has long been hypothesized to be a primary driver of multi-centennial variability. However, all the simulations without this forcing have shown significant multi-centennial variability. The results then indicate that internal mechanisms operate on multi-centennial timescales, and the North Atlantic-Arctic is a region of interest for this aspect.
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| 9. |
- Lin, Yuze, et al.
(författare)
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Mapping Polymer Donors toward High-Efficiency Fullerene Free Organic Solar Cells
- 2017
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Ingår i: Advanced Materials. - : WILEY-V C H VERLAG GMBH. - 0935-9648 .- 1521-4095. ; 29:3
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Tidskriftsartikel (refereegranskat)abstract
- Five polymer donors with distinct chemical structures and different electronic properties are surveyed in a planar and narrow-bandgap fused-ring electron acceptor (IDIC)-based organic solar cells, which exhibit power conversion efficiencies of up to 11%.
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| 10. |
- Wang, Huan, et al.
(författare)
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Thermodynamic effect dictates influence of the Atlantic Multidecadal Oscillation on Eurasia winter temperature
- 2024
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Ingår i: NPJ CLIMATE AND ATMOSPHERIC SCIENCE. - 2397-3722. ; 7:1
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Tidskriftsartikel (refereegranskat)abstract
- The Atlantic Multidecadal Oscillation (AMO) has garnered attention for its important role in shaping surface air temperature (SAT) patterns over Eurasia. While Eurasian winter SAT was traditionally attributed to changes in large-scale atmospheric circulations associated with the AMO, a careful examination of the latest unforced CMIP6 simulations in this study unveils a significant contribution of the AMO's thermodynamic effects. Specifically, the heat released from the North Atlantic Ocean and transported to northern Eurasia through westerlies takes precedence over the effect of dynamic Rossby waves, resulting in warm (cold) phases during positive (negative) AMO cycles, along with increased (decreased) warm extremes and reduced (enhanced) cold extremes. This study contributes to an improved understanding of the dominating mechanism of the AMO's impact on Eurasian SAT.
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