Understanding human influence on climate change in China

National Science Review, Год журнала: 2021, Номер 9(3)

Опубликована: Июнь 23, 2021

China's climate has been warming since the 1950s, with surface air temperature increasing at a rate higher than global average. Changes in have exerted substantial impacts on water resources, agriculture, ecosystems and human health. Attributing past changes to causes provides scientific foundation for national international policies. Here, we review recent progress attributing observed over decades China. Anthropogenic forcings, dominated by greenhouse gas emissions, are main drivers increases mean extreme temperatures. Evidence of effect anthropogenic forcings precipitation is emerging. Human influence increased probability heat events, likely changed occurrence probabilities some heavy events. The way specific attribution question posed conditions under which addressed present persistent challenges appropriately communicating results non-specialists.

Язык: Английский

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Seasonal Cumulative Effect of Ural Blocking Episodes on the Frequent Cold events in China during the Early Winter of 2020/21

Advances in Atmospheric Sciences, Год журнала: 2022, Номер 39(4), С. 609 - 624

Опубликована: Янв. 7, 2022

Abstract Starting in mid-November, China was hit by several cold events during the early winter of 2020/21. The lowest temperature observed at Beijing station on 7 January reached −19.6°C. In this paper, we show that outbreak record-breaking extreme event can be attributed to a huge merging Ural blocking (UB) ridge over Eurasian region. sea-ice cover Kara and East Siberia Seas (KESS) autumn its value since 1979, which could have served as precursor signal. Further analysis shows successive UB episodes occurred from 1 September 2020 10 2021. persistent late September/early October may made an important contribution historical minimum sea ice KESS Our results also that, after each episode winter, significant upward propagation wave activity around 60°E, resulted weakening stratospheric vortex. Meanwhile, caused reduction extent westerly jet mid–high-latitude Eurasia. Results suggest Arctic vortex, is supposed enhance seasonally, became weaker more unstable than climatic mean under seasonal cumulative effects episodes, warming, long-lasting negative-phase North Atlantic Oscillation (NAO–). Those effects, combined with impact La Niña led frequent occurrence events.

Язык: Английский

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Lake warming intensifies the seasonal pattern of internal nutrient cycling in the eutrophic lake and potential impacts on algal blooms

Water Research, Год журнала: 2020, Номер 188, С. 116570 - 116570

Опубликована: Окт. 25, 2020

Язык: Английский

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Influence of Major Stratospheric Sudden Warming on the Unprecedented Cold Wave in East Asia in January 2021

Advances in Atmospheric Sciences, Год журнала: 2022, Номер 39(4), С. 576 - 590

Опубликована: Фев. 21, 2022

Abstract An unprecedented cold wave intruded into East Asia in early January 2021 and led to record-breaking or historical extreme low temperatures over vast regions. This study shows that a major stratospheric sudden warming (SSW) event at the beginning of exerted an important influence on this wave. The SSW occurred 2 subsequently displacement polar vortex Asian side. Moreover, induced signal propagate downward mid-to-lower troposphere, which not only enhanced blocking Urals–Siberia region negative phase Arctic Oscillation, but also shifted tropospheric off pole. displaced vortex, Ural blocking, another downstream ridge western North America formed distinct inverted omega-shaped circulation pattern (IOCP) Asia–North Pacific sector. IOCP was most direct impactful atmospheric causing Asia. triggered meridional cell with upward branch Siberia. intensified Siberian high low-level northerly winds, favored invasion Hence, circulations such as IOCP, high, eastward propagation Rossby eventually outbreak 2021.

Язык: Английский

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Regional asymmetry in the response of global vegetation growth to springtime compound climate events

Communications Earth & Environment, Год журнала: 2022, Номер 3(1)

Опубликована: Май 30, 2022

Abstract Compound climate events can strongly impact vegetation productivity, yet the direct and lagged productivity responses to seasonal compound warm-dry cold-dry remain unclear. Here we use observationally-constrained process-based model data analyze of precipitation temperature in spring summer across global mid-to-high latitudes. We find regional asymmetries effects events. In high-latitudes (>50°N), raise productivity. contrast, mid-latitudes (23.5–50°N/S), reduce springs cause amplify droughts, thereby reducing impose adverse impacts on latitudes, exceeding from individual cold dry Our results highlight benefits a multivariate perspective vulnerability as often covary jointly drive impacts.

Язык: Английский

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Stable precipitation isotope records of cold wave events in Eurasia

Atmospheric Research, Год журнала: 2023, Номер 296, С. 107070 - 107070

Опубликована: Окт. 21, 2023

Язык: Английский

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Research progresses and prospects of multi-sphere compound extremes from the Earth System perspective

Science China Earth Sciences, Год журнала: 2024, Номер 67(2), С. 343 - 374

Опубликована: Янв. 4, 2024

Язык: Английский

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Synoptic dynamics of cold waves over north India: Underlying mechanisms of distinct cold wave conditions

Weather and Climate Extremes, Год журнала: 2024, Номер 43, С. 100641 - 100641

Опубликована: Янв. 11, 2024

The cold air outbreaks in northern parts of India exert significant impacts on human health, energy, agriculture and transportation. In this work, we investigate the synoptic dynamics waves their linkages to large scale circulations for winter period 1982–2020. Cold are classified into normal intense (NCWs ICWs) based intensity examine underlying mechanisms formation atmospheric drivers. Notably, spatial extent ICWs is almost double than that ones thereby having potential affect a wider population. NCWs often influenced by western disturbances, leading inflow from Siberia (a region shallow high). contrast, mostly linked presence an omega block over Ural-Siberian region. downstream portion Ural favoured northerlies north India, advection extreme wave conditions. influence Arctic warming further confirmed through prominent Quasi-Resonant Amplification (QRA) fingerprint. Furthermore, La Niña condition seems be playing crucial role triggering India. During Niña, low level cyclonic anomaly helps advecting higher latitudes country. frequency as well duration events also found more years compared El Niño neutral years. trend analysis reveals decrease frequency, during due combination various factors such rising minimum temperatures (due global warming), decreasing number weather systems amplification.

Язык: Английский

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2020/21 record-breaking cold waves in east of China enhanced by the ‘Warm Arctic-Cold Siberia’ pattern

Environmental Research Letters, Год журнала: 2021, Номер 16(9), С. 094040 - 094040

Опубликована: Авг. 19, 2021

Abstract Extreme cold waves frequently occur in east of China that dramatically endanger ecological agriculture, power infrastructure and human life. In this study, we found the ‘Warm Arctic-Cold Siberia’ pattern (WACS) significantly enhanced according to daily composites from 1979 2018. During winter 2020/21, a record-breaking wave broke out following noticeable WACS phenomenon induced record-low surface air temperature at 60 meteorological stations since they were established (nearly years). On 3 January 2021, difference anomaly between Barents–Kara Sea Siberia reached 20 °C, peak 2020/21. With shrinking meridional gradient, atmospheric baroclinicity weakened correspondingly. The accompanying anomalies, i.e. persistent Ural Blocking High Baikal deep trough effectively transported stronger than sole impact Arctic warming. After 4 d, experienced severe decrease more 8 covering an area 2500 000 km 2 . same winter, warm event occurred February ‘Cold Arctic-Warm Eurasia’ also appeared as precursory signal. Furthermore, on interannual scale, connection winter-mean anomalies existed even performed strongly both observations simulation data CMIP6.

Язык: Английский

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Bilateral passive thermal management for dynamical temperature regulation

Scientific Reports, Год журнала: 2024, Номер 14(1)

Опубликована: Фев. 4, 2024

Abstract Space heating and cooling of buildings account for $$\sim $$ ∼ 30% energy consumed globally. As a result, efforts to reduce the carbon footprint associated with building temperature regulation are crucial achieving sustainability goals. Passive radiative sun two promising innovations that can help consumption regulation. However, these methods constrained by factors such as climate zones seasonal changes. In this work, we demonstrate numerically bilateral photonic metamaterials enabled vanadium dioxide (VO 2 ) nanoparticles embedded into polyethylene nanogratings achieve dynamically modulate solar absorptance at one side in winter on another side. cold weather, metastructure change from 0.93 0.2 critical when VO changes metallic an insulating state. This consists broadband transparent (PE) gratings reflective silver (Ag) same period filling ratio. These deposited top Polydimethylsiloxane (PDMS) thin film. The enable dynamic modulation space heating, while PDMS strong infrared emittance derived molecular vibrations over atmospheric window summer cooling. Temperature response simulations validate design achieves 6 °C subambient drop noontime stabilizes its around 22 during daytime winter. passive dynamical thermal technique be deployed energy-saving targets buildings, vehicles, greenhouses areas large fluctuations.

Язык: Английский

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