A5055706387- Climate variability and models
- Meteorological Phenomena and Simulations
- Oceanographic and Atmospheric Processes
- Arctic and Antarctic ice dynamics
- Tropical and Extratropical Cyclones Research
- Climate change and permafrost
- Cryospheric studies and observations
- Ocean Waves and Remote Sensing
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Fluid Dynamics and Turbulent Flows
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Atmospheric chemistry and aerosols
- Marine and coastal ecosystems
- Geological Studies and Exploration
- Wind and Air Flow Studies
- Plant Water Relations and Carbon Dynamics
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
- Ionosphere and magnetosphere dynamics
- Lattice Boltzmann Simulation Studies
- Solar and Space Plasma Dynamics
- Nonlinear Waves and Solitons
- Atmospheric aerosols and clouds
Institute of Atmospheric Physics
2016-2025
Chinese Academy of Sciences
2016-2025
University of Chinese Academy of Sciences
2017-2025
Ocean University of China
2007-2022
The University of Melbourne
2019-2022
University at Albany, State University of New York
2019-2022
Albany State University
2019-2021
Qingdao National Laboratory for Marine Science and Technology
2017-2020
Columbia University
2019
NOAA Pacific Marine Environmental Laboratory
2019
Abstract Warming in the Arctic has been much faster than rest of world both observations and model simulations, a phenomenon known as amplification (AA) whose cause is still under debate. By analyzing data here we show that large AA occurs only from October to April over areas with significant sea-ice loss. largely disappears when sea ice fixed or melts away. Periods larger are associated loss, models bigger loss produce AA. Increased outgoing longwave radiation heat fluxes newly opened...
Abstract In Part I of this study, the impact Ural blocking (UB) on warm Arctic–cold Eurasian (WACE) pattern associated with winter (DJF) arctic sea ice loss during 1979–2013 is examined by dividing reduction region into two dominant subregions: Barents and Kara Seas (BKS) North American high-latitude (NAH) (Baffin Hudson Bay, Davis Strait, Labrador Sea). It found that atmospheric response to resembles a negative Arctic oscillation positive height anomaly over subarctic region. Regression...
Abstract Part I of this study examines the relationship among winter cold anomalies over Eurasia, Ural blocking (UB), and background conditions associated with Arctic warming Barents Kara Seas (BKS) using reanalysis data. It is found that intensity, persistence, occurrence region UB-related Eurasian depend strongly on strength vertical shear (VS) mean westerly wind (MWW) mid–high-latitude Eurasia related to BKS warming. Observational analysis reveals during 1951–2015 UB days are 64% (54%)...
Abstract In Part I of this study, the Ural blocking (UB)-induced amplification role winter warm Arctic–cold Eurasian (WACE) anomalies has been examined. It was found that long-lived UB together with positive North Atlantic Oscillation (NAO + ) significantly contributes to WACE pattern. The present study examines how variability affects quasi-biweekly (QB-WACE) and depends on NAO conditions by classifying based a case cold event occurred over southern China in January 2008. A composite...
The impact of winter atmospheric blocking over the Ural Mountains region (UB) coincident with different phases North Atlantic Oscillation (NAO) on sea ice variability Barents and Kara Seas (BKS) in is investigated. It found that UB conjunction positive phase NAO (NAO+) leads to strongest decline. During this composites trajectory analyses reveal an efficient moisture pathway BKS from mid-latitude near Gulf Stream Extension where water vapor abundant due high surface temperatures. NAO+-UB...
Abstract A winter Eurasian cooling trend and a large decline of sea ice concentration (SIC) in the Barents–Kara Seas (BKS) are striking features recent climate changes. The question arises as to what extent these phenomena related. mechanism is presented that establishes link between SIC midlatitude cold extremes. Such potential weather linkages mediated by whether there weak north–south gradient background tropospheric vorticity (PV). strong PV gradient, which usually occurs North Atlantic...
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...
The influence of the Atlantic Multidecadal Oscillation (AMO) on Asian monsoonal climate in all four seasons is investigated by comprehensive observational analyses and ensemble experiments with atmospheric general circulation models (AGCMs). Three AGCMs are forced prescribed climatological seasonal cycle sea surface temperature (SST) or additional SST anomalies representing warmth phase AMO. results both observations consistently suggest that warm AMO gives rise to elevated air temperatures...
Abstract Winter atmospheric blocking circulations such as Ural (UB) have been recognized to play an important role in recent winter Eurasian cooling. Observational analyses performed here reveal that the warming Barents–Kara Seas (BKS) related decline of sea ice concentration (SIC) has accompanied by a large increase mean duration UB events. A new energy dispersion index (EDI) is designed help physics behind this association and show how BKS can influence This EDI mainly reflects meridional...
In this paper, the lead–lag relationship between Arctic sea ice variability over Barents–Kara Sea (BKS) and Ural blocking (UB) in winter (DJF) ranging from 1979/80 to 2011/12 is examined. It found that a regressed DJF-mean field an increased UB frequency (days) corresponds enhanced decline BKS, while high surface temperature BKS accompanied by significant reduction. Lagged daily regression correlation reveal growth maintenance of related positive North Atlantic Oscillation (NAO + ) through...
Abstract In Part I of this study, it was shown that the Eurasian cold anomalies related to Arctic warming depend strongly on quasi stationarity and persistence Ural blocking (UB). The analysis here revealed under weak mean westerly wind (MWW) vertical shear (VS) (quasi barotropic) conditions with synoptic-scale eddies a large planetary wave anomaly, growth UB is slow its amplitude small. For case, quasi-stationary persistent seen. However, strong MWW VS baroclinic) conditions, are stronger...
Abstract Two intense heatwaves of July and early August 2018 are found to be associated with a European blocking (EB) event accompanied by series consecutive positive North Atlantic Oscillation (NAO + ) events. Further analyses show that the collaborative role an EB its upstream NAO pattern could increase frequency, persistence, magnitude scale over Europe. Compared -unrelated events, -related events less movable (quasi-stationary) more persistent Europe, which contribute in intensity...
Abstract In this paper, an extended nonlinear multiscale interaction model of blocking events in the equivalent barotropic atmosphere is used to investigate effect a slowly varying zonal wind meridional direction on dipole that regarded as Rossby wave packet. It shown gradient potential vorticity (PVy=∂PV/∂y) prior onset, which related background and its nonuniform shear, can significantly affect lifetime, intensity, north–south asymmetry blocking, while itself driven by preexisting incident...
Winter Arctic sea-ice concentration (SIC) decline plays an important role in amplification which, turn, influences ecosystems, midlatitude weather and climate. SIC over the Barents-Kara Seas (BKS) shows large interannual variations, whose origin is still unclear. Here we find that variations winter BKS have significantly strengthened recent decades likely due to increased amplitudes of El Niño-Southern Oscillation (ENSO) a warming La Niña leads enhanced Atlantic Hadley cell positive phase...
Abstract In recent decades boreal wildfires have occurred frequently over eastern Siberia, leading to increased emissions of carbon dioxide and pollutants. However, it is unclear what factors contributed increases in these wildfires. Here, using the data we show that background Siberian Arctic warming (BAW) related summer Russian sea-ice decline accounts for ~79% increase vapor pressure deficit (VPD) controls Siberia 2004-2021 with remaining ~21% internal atmospheric variability associated...
Abstract A simple theoretical model is proposed to clarify how synoptic-scale waves drive the life cycle of North Atlantic Oscillation (NAO) with a period nearly two weeks. This able elucidate what determines phase NAO and an analytical solution presented indicate high similarity between dynamical processes zonal index, which not derived analytically in previous studies. It suggested theoretically that indeed nonlinear initial-value problem, forced by both preexisting planetary-scale waves....
Abstract In this paper, a new two-dimensional blocking index is proposed by defining difference between the daily 500-hPa geopotenial heights at reference latitude and its north side. The determined composite latitude-dependent height of events in different seasons sectors. can take account duration, intensity, propagation, spatial structure event. Using index, characteristics (frequency, preferred occurrence region) action North Hemisphere (NH) are investigated using 42-yr sample from...
Abstract A new forced envelope Rossby soliton model in an equivalent barotropic beta-plane channel is proposed to describe the interaction between incipient block (planetary scale) and short synoptic-scale eddies. This based on two assumptions, motivated by observations that (i) there exists a zonal scale separation planetary-scale waves (ii) range of wavenumber comparable wavenumber. These assumptions allow analytical treatment. The evolution under influence eddies described nonlinear...
In this article, a nonlinear multiscale interaction (NMI) model is used to propose an eddy-blocking matching (EBM) mechanism account for how synoptic eddies reinforce or suppress blocking flow. It shown that the spatial structure of eddy vorticity forcing (EVF) arising from upstream determines whether incipient block can grow into meandering flow through its with transient west. Under certain conditions, EVF exhibits low-frequency oscillation on time-scales 2–3 weeks. During phase...
Abstract This study examines the relationship between intraseasonal southern annular mode (SAM) events and El Niño–Southern Oscillation (ENSO) using daily 40-yr ECMWF Re-Analysis (ERA-40) data. The data coverage spans years 1979–2002, for austral spring summer seasons. focus of this is on question why positive SAM dominate during La Niña negative Niño. A composite analysis performed zonal-mean zonal wind, Eliassen–Palm fluxes, two diagnostic variables: meridional potential vorticity...
Abstract In this paper, the physical processes underlying recent winter cold anomalies over East Asia (EA) are examined via statistical analysis. It is found that EA anomaly depends on warming in North Atlantic, sea ice loss Barents–Kara Sea (BKS), and atmospheric teleconnection patterns. Specifically, BKS can anchor patterns originating from different Atlantic surface temperature (SST) Different of affect position region through altering circulations. addition, whether relevant pattern...