155 results for "L Ruby Leung"
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Journal Article
Large-scale environmental variables and transition to deep convection in cloud resolving model simulations: A vector representation
Cloud resolving model simulations and vector analysis are used to develop a quantitative method of assessing regional variations in the relationships between various large-scale environmental variables and the transition to deep convection. Results of the CRM simulations from three tropical regions…
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Journal Article
Machine Learning Calibration of Groundwater Table Depth in ELM: Impact on Land Surface Hydrology and Land‐Atmosphere Fluxes
Abstract Accurate representation of groundwater table depth (GWTD) is crucial for simulating hydrological cycling in Earth system models (ESM). Nevertheless, there is a notable gap in the literature regarding the validation of GWTD simulations in ESMs and their subsequent impact on downstream…
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Journal Article
Changes in temporal variability of precipitation over land due to anthropogenic forcings
This study investigated the anthropogenic influence on the temporal variability of annual precipitation for the period 1950–2005 as simulated by the CMIP5 models. The temporal variability of both annual precipitation amount (PRCPTOT) and intensity (SDII) was first measured using a metric of…
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Journal Article
Evolution of global snow drought characteristics from 1850 to 2100
Seasonal snow is an integral part of the global water supply and storage system. Snow droughts impact ecological, agricultural, and urban systems by altering the amount and timing of meltwater delivery. These droughts are characterized by a lack of on-the-ground snow (snow water equivalent, SWE)…
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Journal Article
Impact of Penetrating Kelvin Waves on MJO Rainfall Propagation Through Deep Convection Modulation
Abstract The Madden‐Julian Oscillation (MJO) is a dominant intraseasonal oscillation in the tropics. As MJOs propagate over the Indian Ocean, some of them can be penetrated by fast‐moving equatorial Kelvin waves originating to the west of the MJOs. Through a series of sensitivity experiments, we…
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Journal Article
Climate nowcasting
The climate is changing so rapidly that climatologies based on historical statistics cannot reliably capture the current risk of extreme weather events hazardous to society. Decision relevant projections of weather extreme probability over the next 10–15 years are needed to enable adaptation and…
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Journal Article
Neutral Mode Dominates the Forced Global and Regional Surface Temperature Response in the Past and Future
Abstract Using a large suite of Green's function perturbation experiments, we construct the emergent dynamical operator for surface temperature and extract the most excitable mode. The leading mode turns out to be the most dominant mode excited by the climate forcing of doubling CO2, alone…
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Journal Article
The Role of Interactive Soil Moisture in Land Drying Under Anthropogenic Warming
Abstract Relative humidity (RH) is projected to increase over ocean but decrease over land under anthropogenic warming. The land RH decrease was previously attributed to ocean influences on land changes. Here, we show that interactive soil moisture (SM) is necessary and may be sufficient for…
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Journal Article
Weather Systems Connecting Modes of Climate Variability to Regional Hydroclimate Extremes
Abstract Weather system clustering provides a high‐level summary of regional meteorological conditions. Most quantitative clustering schemes focus on precipitation alone, which does not sufficiently describe the meteorological conditions driving hydroclimate variability. This study presents the…
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Journal Article
Oceanic control of Northeast Pacific hurricane activity at interannual timescales
Sea surface temperature (SST) is not the only oceanic parameter that can play a key role in the interannual variability of Northeast Pacific hurricane activity. Using several observational data sets and the statistical technique of multiple linear regression analysis, we show that, along with SST…
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Journal Article
Land Surface Heterogeneity Captured by Topography‐Based Subgrid Structures in Grid‐Based and Watershed‐Based Computational Units
Abstract Motivated by the need to improve the representation of small‐scale surface heterogeneity in Earth System Models (ESMs), new algorithms have been introduced to discretize ESM computational units (CUs) into a variable number of subgrid topographic units for improving model simulations with…
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Journal Article
Convective Momentum Transport and Its Impact on the Madden‐Julian Oscillation in E3SM‐MMF
Abstract Convective momentum transport (CMT) is the process of vertical redistribution of horizontal momentum by small‐scale turbulent flows from moist convection. Traditional general circulation models (GCMs) and their multiscale modeling framework (MMF) versions poorly represent CMT due to…
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Journal Article
A Greening Future Elevates Flash Drought Risk in Northern Mid‐to‐High Latitudes
Abstract Flash droughts have become a growing concern, as they can emerge rapidly and increase the risk of crop failure. Although past studies have investigated the meteorological drivers and future changes of flash drought, why flash drought is more frequent over humid and vegetated regions…
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Journal Article
Spatial pattern of lake evaporation increases under global warming linked to regional hydroclimate change
Spatial patterns in lake evaporation increase with global warming are closely linked to regional hydroclimate drying through energetic and aerodynamic effects, according to analyses of ensemble projections of lake and climate models.
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Journal Article
Uncertainty in El Niño-like warming and California precipitation changes linked by the Interdecadal Pacific Oscillation
There is a strong disagreement between climate models on how precipitation in California will change. Here, the authors show that much of this uncertainty originates from internal variability with the Interdecadal Pacific Oscillation linking the precipitation changes with the El Niño-like warming…
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Journal Article
Regional and Teleconnected Impacts of Solar Radiation‐Topography Interaction Over the Tibetan Plateau
Abstract Solar radiation‐topography interaction plays an important role in surface energy balance over the Tibetan Plateau (TP). However, the impacts of such interaction over the TP on climate locally and in the Asian regions remain unclear. This study uses the Energy Exascale Earth System Model…
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Journal Article
Persistent cold air outbreaks over North America in a warming climate
This study examines future changes of cold air outbreaks (CAOs) using a multi-model ensemble of global climate simulations from the Coupled Model Intercomparison Project Phase 5 and high resolution regional climate simulations. Overall, climate models agree on a dip in CAO duration across North…
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Journal Article
Examining Clustered MCSs and Their Precipitation Significance Over Global Land MCS Hotspots
Abstract Multiple independent mesoscale convective systems (MCSs) can occur closely in space and time, subjecting common geographic regions to multiple precipitation events over short periods. Motivated by an earlier study highlighting significant hydrological impacts of clustered MCSs in the US…
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Journal Article
Quantifying Dissolved Organic Carbon Dynamics Using a Three‐Dimensional Terrestrial Ecosystem Model at High Spatial‐Temporal Resolutions
Abstract Arctic terrestrial ecosystems are very sensitive to the global climate change due to the large storage of soil organic carbon and the presence of snow, glacier, and permafrost, which respond directly to near surface air temperature that has warmed in the Arctic by almost twice as much as…
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Journal Article Full text
Radiative impact of mineral dust on monsoon precipitation variability over West Africa
The radiative forcing of dust and its impact on precipitation over the West Africa monsoon (WAM) region is simulated using a coupled meteorology and aerosol/chemistry model (WRF-Chem). During the monsoon season, dust is a dominant contributor to aerosol optical depth (AOD) over West Africa. In the…