Ji Nie

Ji Nie
Peking University | PKU · Department of Atmospheric and Oceanic Sciences

PhD

About

37
Publications
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571
Citations
Introduction
atmospheric and climate dynamics
Skills and Expertise

Publications

Publications (37)
Article
Full-text available
In this study, we investigate the climate attribution of the 21·7 Henan extreme precipitation event. A conditional storyline attribution method is used, based on simulations of the event with a small-domain high-resolution cloud-resolving model. Large-scale vertical motion is determined by an interactive representation of large-scale dynamics based...
Preprint
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In this study, we investigate the climate attribution of the 7∙20 Henan extreme precipitation event. A conditional storyline attribution method is used, based on simulations of the event with a small-domain high-resolution cloud-resolving model. Large-scale vertical motion is determined by an interactive representation of large-scale dynamics based...
Article
Full-text available
The Phanerozoic Eon has witnessed considerable changes in the climate system as well as abundant animals and plant life. Therefore, the evolution of the climate system in this Eon is worthy of extensive research. Only by studying climate changes in the past can we understand the driving mechanisms for climate changes in the future and make reliable...
Article
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Extreme extratropical storms are among the most impact‐relevant weather events in the midlatitudes. Under global warming, extreme storms are expected to intensify; however, little is known about the response of their spatial structure. Here, we show that with warming, extreme storms not only become stronger, but also grow larger. By employing multi...
Article
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Regional consumption activities supported by domestic production and international trade have led to substantial aerosol-related emissions worldwide. Here we quantify sulfur dioxide emissions associated with consumption by developed and developing countries and assess the resulting climate impacts using an Earth system model. We find that although...
Article
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The controlling factors of the interannual variability of extreme precipitation (EP) are examined on a global scale. We quantify the moisture (thermodynamic) and vertical motion (dynamic) contributions to the interannual variability of EP by applying a physical scaling diagnosis. The thermodynamic contribution is small and the dynamic contribution...
Article
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The prediction of tropical cyclones (TC) genesis remains a great challenge. This study shows that the radiation (mostly cloud‐radiation) feedback accelerates the formation of Typhoon Haiyan (2013) by first enhancing the mid‐level circulation. Simulations indicate that the response of the mid‐level circulation is about one day ahead of the low‐level...
Preprint
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Regional consumption activities supported by domestic production and international trade have led to substantial amounts of aerosols worldwide, yet the resulting impacts on the global climate system remains unknown. Here we quantify for the first time the climate response to aerosols associated with consumption by developing and developed countries...
Article
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In the study of diagnosing climate simulations and understanding the dynamics of precipitation extremes, it is an essential step to adopt a simple model to relate water vapor condensation and precipitation, which occur at cloud-microphysical and convective scales, to large-scale variables. Several simple models have been proposed; however, improvem...
Preprint
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The total mass of the atmosphere (or equivalently, the background surface pressure, SP) may have varied significantly over the evolutionary histories of Earth and other planets. Atmospheric mass can affect climate by modifying physical processes, including shortwave scattering, the emissivity of greenhouse gases, the atmospheric heat capacity, and...
Article
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This paper presents a global picture of the dynamic processes and synoptic characteristics of extratropical extreme precipitation events (EPEs), defined as annual maximum daily precipitation averaged over 7.5° × 7.5° regional boxes. Based on the quasi-geostrophic omega equation, extreme precipitation can be decomposed into components forced by larg...
Article
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Responses of extreme precipitation to global warming are of great importance to society and ecosystems. Although observations and climate projections indicate a general intensification of extreme precipitation with warming on global scale, there are significant variations on the regional scale, mainly due to changes in the vertical motion associate...
Preprint
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Understanding the responses of mean and extreme precipitation to climate change is of great importance. Previous studies have mainly focused on the responses to prescribed sea surface warming or warming due to increases of CO2. This study uses a cloud-resolving model under the idealization of radiative-convective equilibrium to examine the response...
Article
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Synoptic meteorology is a branch of meteorology that uses synoptic weather observations and charts for the diagnosis, study, and forecasting of weather. Weather refers to the specific state of the atmosphere near the Earth’s surface during a short period of time. The spatial distribution of meteorological elements in the atmosphere can be represent...
Article
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Extratropical regional-scale extreme precipitation events (EPEs) are usually associated with certain synoptic perturbations superimposed on slow-varying background circulations. These perturbations induce a dynamically forced ascent that destabilizes the atmospheric stratification and stimulates deep convection, which further drives the perturbatio...
Preprint
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5 Extratropical regional-scale extreme precipitation events (EPEs) are usually associated with 6 certain synoptic perturbations superimposed on slow-varying background circulations. These 7 perturbations induce a dynamically forced ascent that destabilizes the atmospheric strati-8 fication and stimulates deep convection, which further drives the pe...
Article
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Using a high-resolution global model with explicit representation of convection, the physical processes involved in the abrupt onset of South Asian summer monsoon are investigated within a moist entropy budget framework. The monsoon onset is a two-stage transition. During the first stage, which starts around 2 months before onset, the source terms...
Article
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An air column under radiative-convective equilibrium is studied here to understand equilibrium climate over different surface elevations. Cloud-resolving model (CRM) simulations show that atmospheric thermal stratifications exhibit similar structures when expressed in sigma coordinates over varying surface elevations under radiative-convective equi...
Article
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This study examines the relationship between the Madden-Julian oscillation (MJO) and the stratospheric quasi-biennial oscillation (QBO) in a limited-area cloud-resolving model with parameterized large-scale dynamics. The model is used to simulate two consecutive MJO events that occurred during the late fall and early winter of 2011. To test the inf...
Article
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A Lagrangian Particle Dispersion Model is embedded into large eddy simulations to diagnose the responses of shallow cumulus convection to a small-amplitude large-scale temperature perturbation. The Lagrangian framework allows for a decomposition of the vertical momentum budget and diagnosis of the forces that regulate cloudy updrafts. The results a...
Article
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Previous research has shown that projected changes in the horizontal eddy length of ascending anomalies likely drive subtropical changes in large-scale ascent during extreme precipitation events (extreme ascent), which in turn strongly influence regional projections of extreme precipitation. Here we present evidence that this eddy length effect ext...
Article
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A useful starting hypothesis for predictions of changes in precipitation extremes with climate is that those extremes increase at the same rate as atmospheric moisture does, which is ∼7% K−1 following the Clausius–Clapeyron (CC) relation. This hypothesis, however, neglects potential changes in the strengths of atmospheric circulations associated wi...
Article
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Devastating floods in northeast Pakistan and northern India occurred in July 2010 and September 2014 as a consequence of extreme precipitation events. The 2010 and 2014 flood events had similar synoptic flow patterns that led to an anomalously high moisture content in the flood region. The quasi-geostrophic omega equation is inverted in order to at...
Article
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Extratropical extreme precipitation events are usually associated with large-scale flow disturbances, strong ascent and large latent heat release. The causal relationships between these factors are often not obvious, however, and the roles of different physical processes in producing the extreme precipitation event can be difficult to disentangle....
Article
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Aqueous phase reactions are important, sometimes dominant (e.g. for SO2), pathways for the oxidation of air pollutants at the local and/or global scale. In many current chemical transport models (CTMs), the transport and aqueous reactions of chemical species are treated as split processes, and the subgrid-scale heterogeneity between cloudy and envi...
Article
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The role of surface heat fluxes underneath cold pools is investigated using cloud-resolving simulations with either interactive or horizontally homogenous surface heat fluxes over an ocean and a simplified land surface. Over the ocean, there are limited changes in the distribution of the cold pool temperature, humidity and gust front velocity, yet...
Article
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A single-column modeling approach is proposed to study the interaction between convection and large-scale dynamics using the quasigeostrophic (QG) framework. This approach extends the notion of "parameterization of large-scale dynamics, "previously applied in the tropics via the weak temperature gradient approximation and other comparable methods,...
Article
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Two Madden-Julian Oscillation (MJO) events, observed during October and November 2011 in the equatorial Indian Ocean during the DYNAMO field campaign, are simulated in a small-domain cloud-resolving model using parameterized large-scale dynamics. Three parameterizations of large-scale dynamics — the conventional weak temperature gradient (WTG) appr...
Article
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Observational studies suggest that the stratospheric quasi-biennial oscillation (QBO) can modulate tropical deep convection. The authors use a cloud-resolving model with a limited domain, representing a convective column in the tropics, to study the mechanisms of this modulation. The large-scale circulation is parameterized using the weak temperatu...
Article
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A new framework for diagnosing mixing in cumulus convection is proposed, where the vertical evolution of the cloud mass flux distribution as a function of given parcel properties is viewed as a mapping process. Matrices that characterize this mapping process are constructed using a Lagrangian particle dispersion model embedded in a Large Eddy Simul...
Article
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Responses of shallow cumuli to large-scale temperature/moisture perturbations are examined through diagnostics of large-eddy simulations (LESs) of the undisturbed Barbados Oceanographic and Meteorological Experiment (BOMEX) case and a stochastic parcel model. The perturbations are added instantaneously and allowed to evolve freely afterward. The pa...
Article
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Idealized dynamical theories that employ a convective quasi-equilibrium (QE) treatment for the diabatic effects of moist convection have been used to explain the location, intensity, and intraseasonal evolution of monsoons. This paper examines whether observations of the earth’s regional monsoons are consistent with the assumption of QE. It is show...
Article
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Northern Hemisphere winter 300 hPa storm tracks/baroclinic waves and their energetics during strong Arctic Oscillation (AO) anomaly events are investigated. It is shown that during strong positive AO anomaly winters, the Atlantic storm track intensifies significantly and shifts northward and far downstream while Pacific storm track extends westward...
Article
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An extended quasigeostrophic two-layer model including nonlinear Ekman pumping and nonlinear interface perturbation is used to numerically study the formation and maintenance of baroclinic wave packets. With an initial zonal jet flow of north–south symmetry and small random initial perturbations wave packets of finite amplitude are produced and mai...

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