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- Yao, Tandong, et al.
(författare)
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Recent Third Pole’s rapid warming accompanies cryospheric melt and water cycle intensification and interactions between monsoon and environment: multi-disciplinary approach with observation, modeling and analysis
- 2019
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Ingår i: Bulletin of The American Meteorological Society. - 0003-0007 .- 1520-0477. ; :March, s. 423-444
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Tidskriftsartikel (refereegranskat)abstract
- The Third Pole (TP) is experiencing rapid warming and is currently in its warmest period in the past 2,000 years. This paper reviews the latest development in multidisciplinary TP research associated with this warming. The rapid warming facilitates intense and broad glacier melt over most of the TP, although some glaciers in the northwest are advancing. By heating the atmosphere and reducing snow/ice albedo, aerosols also contribute to the glaciers melting. Glacier melt is accompanied by lake expansion and intensification of the water cycle over the TP. Precipitation has increased over the eastern and northwestern TP. Meanwhile, the TP is greening and most regions are experiencing advancing phenological trends, although over the southwest there is a spring phenological delay mainly in response to the recent decline in spring precipitation. Atmospheric and terrestrial thermal and dynamical processes over the TP affect the Asian monsoon at different scales. Recent evidence indicates substantial roles that mesoscale convective systems play in the TP’s precipitation as well as an association between soil moisture anomalies in the TP and the Indian monsoon. Moreover, an increase in geohazard events has been associated with recent environmental changes, some of which have had catastrophic consequences caused by glacial lake outbursts and landslides. Active debris flows are growing in both frequency of occurrences and spatial scale. Meanwhile, new types of disasters, such as the twin ice avalanches in Ali in 2016, are now appearing in the region. Adaptation and mitigation measures should be taken to help societies’ preparation for future environmental challenges. Some key issues for future TP studies are also discussed.
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| 2. |
- Sun, Weiyi, et al.
(författare)
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Impacts of major volcanic eruptions over the past two millennia on both global and Chinese climates: A review
- 2024
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Ingår i: Science China Earth Sciences. - 1674-7313 .- 1869-1897. ; 67, s. 61-78
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Forskningsöversikt (refereegranskat)abstract
- Major volcanic eruptions (MVEs) have attracted increasing attention from the scientific community. Previous studies have explored the climatic impact of MVEs over the past two millennia. However, proxy-based reconstructions and climate model simulations indicate divergent responses of global and China’s regional climates to MVEs. Here, we used multiple data from observations, reconstructions, simulations, and assimilations to summarize the historical facts of MVEs, the characteristics and mechanisms of their climatic impact, and directions for future research. We reviewed volcanic datasets and determined intensive MVE periods; these periods corresponded to the years 530–700, 1200–1460, and 1600–1840 CE. After tropical MVEs, a substantial cooling effect is observed throughout the globe and China on the interannual-interdecadal time scales but an inconsistent cooling magnitude is detected between reconstructions and simulations. In the first summer after tropical MVEs, a decrease in global and monsoonal precipitation is observed. In reconstructions and simulations, an increased precipitation is seen for the Yangtze River Basin, while large uncertainties in precipitation changes are present for other regions of China. Decadal drought can be induced by frequent eruptions and volcanism superimposed on low solar irradiation and internal variability. MVEs affect climate directly through the radiative effect and indirectly by modulating internal variability, such as the El Niño–Southern Oscillation (ENSO) and Atlantic Multidecadal Oscillation (AMO). However, changes in the phase, amplitude, and periodicity of ENSO and AMO after MVEs and the associated mechanisms remain controversial, which could account for model-reconstruction disagreements. Moreover, other internal variability, uncertainties in reconstruction methods and aerosol-climate models, and climate background may also induce model-reconstruction disagreements. Knowledge gaps and directions for future research are also discussed.
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