A5047060805- Climate variability and models
- Oceanographic and Atmospheric Processes
- Meteorological Phenomena and Simulations
- Tropical and Extratropical Cyclones Research
- Marine and coastal ecosystems
- Geophysics and Gravity Measurements
- Cryospheric studies and observations
- Ocean Waves and Remote Sensing
- Atmospheric and Environmental Gas Dynamics
- Arctic and Antarctic ice dynamics
- Climate change and permafrost
- Vehicle Noise and Vibration Control
- Acoustic Wave Phenomena Research
- Atmospheric Ozone and Climate
- Geomagnetism and Paleomagnetism Studies
- Aerodynamics and Acoustics in Jet Flows
- Precipitation Measurement and Analysis
- Methane Hydrates and Related Phenomena
- Wind and Air Flow Studies
- Plant Water Relations and Carbon Dynamics
- Hydrology and Drought Analysis
- Lattice Boltzmann Simulation Studies
- Geological formations and processes
- Dynamics and Control of Mechanical Systems
- Hydrological Forecasting Using AI
George Mason University
2015-2024
Hainan University
2022
Shanghai Jiao Tong University
2022
NOAA National Centers for Environmental Prediction
2016-2020
NOAA Climate Prediction Center
2016-2020
Zhejiang University
2020
University of Maryland, College Park
1994-2018
Earth System Science Interdisciplinary Center
2018
National Taiwan University
2016
Northwestern Polytechnical University
2016
Sea surface temperature in the eastern equatorial Atlantic Ocean undergoes anomalous warming events of 1°–2°C every few years. The warm anomalies reach their maximum strength Northern Hemisphere summer, when upwelling normally brings cold thermocline water to surface. By compositing observations from a 28-year record, we are able identify consistent features SST and winds. composites show that northern summer confined region, with reduced zonal winds west northward trade east. Accompanying...
The interannual variability in the tropical Indian Ocean is examined using 41‐year (1958–1998) seasonal anomalies of upper‐ocean heat content (HCA), sea surface temperature (SSTA), and wind stress. Precipitation from a shorter period (1979–1998) have also been analyzed. This analysis demonstrates that coupled ocean–atmosphere oscillation with ranging 2 to 5 years major Ocean. At peak phase, anomalous equatorial zonal winds over central eastern ocean trade south induce SSTA HCA gradients near...
The effects of horizontal resolution and the treatment convection on simulation diurnal cycle precipitation during boreal summer are analyzed in several innovative weather climate model integrations. simulations include: season-long integrations Non-hydrostatic Icosahedral Atmospheric Model (NICAM) with explicit clouds convection; year-long operational Integrated Forecast System (IFS) from European Centre for Medium-range Weather Forecasts at three resolutions (125, 39 16 km); seasonal same...
Northern Hemisphere tropical cyclone (TC) activity is investigated in multiyear global climate simulations with the ECMWF Integrated Forecast System (IFS) at 10-km resolution forced by observed records of sea surface temperature and ice. The results are compared to analogous 16-, 39-, 125-km versions model as well observations. In North Atlantic, mean TC frequency comparable frequency, whereas it too low other versions. While spatial distributions genesis track densities improve...
Abstract Global simulations have been conducted with the European Centre for Medium-Range Weather Forecasts operational model run at T1279 resolution multiple decades representing climate from late twentieth and twenty-first centuries. Changes in key components of water cycle are examined, focusing on variations short time scales. Metrics coupling feedbacks between soil moisture surface fluxes properties planetary boundary layer (PBL) inspected. Features precipitation other trends coupled...
We confront four model systems in three configurations (LSM, LSM+GCM, and reanalysis) with global flux tower observations to validate states, surface fluxes, coupling indices between land atmosphere. Models clearly under-represent the feedback of fluxes on boundary layer properties (the atmospheric leg land-atmosphere coupling), may over-represent connection soil moisture terrestrial leg). generally spatial temporal variability relative observations, which is at least partially an artifact...
According to the classical theories of ENSO, subsurface anomalies in ocean thermal structure are precursors for ENSO events and their initial specification is essential skillful forecast. Although salinity tropical Pacific (particularly western warm pool) can vary response El Niño events, its effect on evolution forecasts has been less explored. Here we present evidence that, addition passive response, variability may also play an active role thus important forecasting events. By comparing...
Abstract In this work, the evolution and prediction of persistent remarkable warm sea surface temperature anomaly (SSTA) in northeastern Pacific during October 2013–June 2016 are examined. Based on experiments with an atmospheric model, possible contribution SSTAs different ocean basins to circulation anomalies is identified. Further, through verifying real-time forecasts, current capabilities predicting such extreme event a state-of-the-art coupled general model assessed. During...
The Center for Ocean‐Land‐Atmosphere Studies anomaly coupled prediction system, using a sophisticated dynamical model of the tropical Pacific Ocean and global atmosphere, is described. resolution component models moderate, with atmospheric spectral truncated at triangular total wavenumber 30 18 vertical levels. ocean Basin 0.58 latitude 1.58 longitude in waveguide 20 performance uncoupled motivates coupling strategy has led to development simple empirical technique converting 850-mb zonal...
Abstract The influence of the El Niño–Southern Oscillation (ENSO) and Pacific decadal oscillation (PDO) interference on dry wet conditions in Great Plains United States has been examined using monthly observational datasets. It is shown that both ENSO PDO can generate a similar pattern atmospheric oceanic anomalies over eastern part North western America significant impact climate Plains. Furthermore, relationship between ENSO–PDO intensified when are phase (El Niño warm or La Niña cold...
Abstract For long-range predictions (e.g., seasonal), it is a common practice for retrospective forecasts (also referred to as the hindcasts) accompany real-time predictions. The necessity hindcasts stems from fact that need be calibrated in an attempt remove influence of model biases on predicted anomalies. A fundamental assumption behind forecast calibration long-term stationarity bias derived based hindcasts. Hindcasts require specification initial conditions various components prediction...
The importance of using dedicated high-end computing resources to enable high spatial resolution in global climate models and advance knowledge the system has been evaluated an international collaboration called Project Athena. Inspired by World Modeling Summit 2008 made possible availability provided National Science Foundation from October 2009 through March 2010, Athena demonstrated sensitivity simulations representation subgrid-scale processes with horizontal resolutions up 10 times...
In this study, the impact of ocean initial conditions (OIC) on prediction skill in tropical Pacific Ocean is examined. Four sets OIC are used to initialize 12‐month hindcasts climate from 1979 2007, using Climate Forecast System, version 2 (CFSv2), current operational model at National Centers for Environmental Predictions (NCEP). These OICs chosen four analyses produced by NCEP and European Center Medium Range Weather Forecasts (ECMWF). For each hindcast starting a given OIC, ensemble...
Abstract The 2014 El Niño, anticipated to be a strong event in early 2014, turned out fairly weak. In the tropical Pacific exhibited persistent negative SST anomalies southeastern and positive north, following pattern of Southern Meridional Mode. this study, we explored role off-equatorial prediction. Our experiments show that 40% amplitude error at peak phase could attributed lack prediction Pacific. However, impact model is partially compensated by absence western North model. response...
The tropical Atlantic variability is composed of three major patterns significant importance for and predictability climate in the sector. They are southern (STA) pattern with anomalous sea surface temperature (SST) fluctuations expanding from Angolan coast to central equatorial ocean, northern (NTA) centered near African coast, subtropical (SSA) open ocean. Previous studies have suggested that both regional air–sea coupling remote forcing outside basin may affect formation these their...
Abstract A 110-yr simulation is conducted using a specially designed coupled ocean–atmosphere general circulation model that only allows air–sea interaction over the Atlantic Ocean within 30°S–60°N. Since influence from Pacific El Niño–Southern Oscillation (ENSO) removed in this run, it provides better view of extratropical influences on tropical sector. The results are compared with observations also have their ENSO components subtracted. reproduces two major anomalous patterns sea surface...
A CGCM is used to study the relative roles played by local air‐sea interaction and remote ENSO effects on tropical Atlantic interannual variability. regional coupling strategy allows full only over Ocean north of 30°S. Two experiments were conducted, respectively with either climatological or real time boundary conditions prescribed uncoupled portion global domain. The simulations show that major anomalous SST modes in South are mainly caused coupled ocean‐atmosphere processes within sector....
Abstract Seasonality of sea surface temperature (SST) predictions in the tropical Indian Ocean (TIO) was investigated using hindcasts (1982–2009) made with NCEP Climate Forecast System version 2 (CFSv2). CFSv2 produced useful TIO SST lead times up to several months. A substantial component this skill attributable signals other than dipole (IOD). The prediction IOD index, defined as difference between anomaly (SSTA) averaged over 10°S–0°, 90°–110°E and 10°S–10°N, 50°–70°E, had strong...