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Steven E. Peckham authored and/or contributed to the following articles/publications.
This study develops fine temporal (seasonal, day-of-week, diurnal) and vertical allocations of anthropogenic emissions for the TRACE-P inventory and evaluates their impacts on the East Asian air quality prediction using WRF-Chem simulations in July 2001 at 30-km grid spacing against available surface measurements from EANET and NEMCC. For NO2 an...
This study examines meteorological conditions associated with regional surface ozone using data collected during the summer Second Texas Air Quality Experiment, and the ability of the Nonhydrostatic Mesoscale Model-Community Multi-scale Air Quality Model (NMM-CMAQ) and the Weather Research and Forecast (WRF) model coupled with Chemistry (WRF-Che...
Predictions of particulate properties and their effect on meteorological conditions via direct (scattering and absorption of radiation) and indirect (cloud-aerosol interactions) radiative forcing still contain large uncertainties. To address this issue, we have developed an Aerosol Modeling Testbed that streamlines the process of testing and eva...
Development of a lightning NOx algorithm for WRF-Chem
NOx produced by lightning (LNOx) is an important factor in the formation of tropospheric ozone. Atmospheric chemistry models such as WRF-Chem can simulate the photochemistry of ozone (O¬3), but to produce accurate O3 concentrations, it is important to accurately specify the LNOx. Lightning is particularly important in contributing to the product...
Kalman filtering (KF) is used to estimate systematic errors in surface ozone forecasts. The KF updates its estimate of future ozone-concentration bias using past forecasts and observations. The optimum filter parameter is estimated via sensitivity analysis. KF performance is tested for deterministic, ensemble-averaged and probabilistic forecasts...
Ozone differences between near-coastal and offshore sites in New England: Role of meteorology
Time series from two ozone monitoring stations are evaluated, one on an island several km off the New England coast, the other several km inland in New Hampshire. In the summer of 2002, during the New England Air Quality Study 2002 (NEAQS-2002), ozone measurements at the island station, Appledore Island (ADI), were consistently higher than at th...
Real-time forecasts of PM2.5 aerosol mass from seven air quality forecast models (AQFMs) are statistically evaluated against observations collected in the northeastern United States and southeastern Canada from two surface networks and aircraft data during the summer of 2004 International Consortium for Atmospheric Research on Transport and Tran...
A multimodel ensemble air quality forecasting system was created as part of the New England Air Quality Study (NEAQS-2004) during the summer of 2004. Seven different models were used, with their own meteorology, emissions, and chemical mechanisms. In addition, one model was run at two different horizontal grid resolutions, providing a total of e...
A new fully coupled meteorology-chemistry-aerosol model is used to simulate the urban-to regional-scale variations in trace gases, particulates, and aerosol direct radiative forcing in the vicinity of Houston over a 5 day summer period. Model performance is evaluated using a wide range of meteorological, chemistry, and particulate ...
The turbulent mixing and chemical transformation in the planetary boundary layer (PBL) play a crucial role in the distribution of chemical species. Thus, the reasonable representation of the PBL processes in a mesoscale chemical transport model is a key to the accurate prediction of concentrations of chemical species, e.g., ozone. In this study,...
The National Oceanic and Atmospheric Administration recently sponsored the New England Forecasting Pilot Program to serve as a ``test bed'' for chemical forecasting by providing all of the elements of a National Air Quality Forecasting System, including the development and implementation of an evaluation protocol. This Pilot Program e...
A simple method to improve ensemble-based ozone forecasts
Forecasts from seven air quality models and ozone data collected over the eastern USA and southern Canada during July and August 2004 are used in creating a simple method to improve ensemble-based forecasts of maximum daily 1-hr and 8-hr averaged ozone concentrations. The method minimizes least-square error of ensemble forecasts by assigning we...
Numerical simulation of the interaction between the dryline and horizontal convective rolls
The results of high-resolution simulations of an idealized dryline environment are discussed. The use of a single high-resolution domain, combined with accurate advection numerics and minimized numerical filtering, allows the explicit resolution of large horizontal convective roll (HCR) circulations and their daytime evolution. The ...
NUMERICAL SIMULATION OF THE INTERACTION BETWEEN THE DRYLINE AND HORIZONTAL CONVECTIVE ROLLS
High Resolution Simulation of the Development and Structure of a Tornado and Its Parent Supercell
A North American Hourly Assimilation and Model Forecast Cycle: The Rapid Refresh
The Rapid Refresh (RAP), an hourly-updated assimilation and model forecast system, replaced the Rapid Update Cycle (RUC) as an operational regional analysis and forecast system among the suite of models at the NOAA National Centers for Environmental Prediction (NCEP) in 2012. The need for an effective hourly-updated assimilation and modeling sys...
Institution National Oceanic and Atmospheric Administration - NOAA
Exploring Aerosol Effects on Rainfall for Brisbane, Australia
The majority of studies assessing aerosol effects on rainfall use coarse spatial scale (1° latitude/longitude or more) and multi-seasonal or decadal data sets. Here, we present results from a spatial correlation of aerosol size distribution and rain rate for selected stratiform and cumuliform precipitation events. The chemistry transport version...
A convective parameterization is applied and evaluated that may be used in high resolution non-hydrostatic mesoscale models for weather and air quality prediction, as well as in modeling system with unstructured varying grid resolutions and for convection aware simulations. This scheme is based on a stochastic approach originally implemented by ...
Because of limitations of variational and ensemble data assimilation schemes, resulting analysis fields exhibit some noise from imbalance in subsequent model forecasts. Controlling finescale noise is desirable in the NOAA’s Rapid Refresh (RAP) assimilation/forecast system, which uses an hourly data assimilation cycle. Hence, a digital filter ini...
Institution National Oceanic and Atmospheric Administration - NOAA
The Earth System Prediction Suite: Toward a Coordinated U.S. Modeling Capability
The Earth System Prediction Suite (ESPS) is a collection of flagship U.S. weather and climate models and model components that are being instrumented to conform to interoperability conventions, documented to follow metadata standards, and made available either under open-source terms or to credentialed users. The ESPS represents a culmination...
Institutions Earth System Research Laboratory - ESRL National Center for Atmospheric Research - NCAR
WRF-Chem Version 3.8.1 Users Guide
The WRF-Chem User's Guide is designed to provide the reader with information specific to the chemistry part of the WRF model and its potential applications. It will provide the user a description of the WRF-Chem model and discuss specific issues related to generating a forecast that includes chemical constituents beyond what is typically used by...
Institutions National Center for Atmospheric Research - NCAR National Oceanic and Atmospheric Administration - NOAA
WRF/Chem Version 3.3 User's Guide
Institutions Earth System Research Laboratory - ESRL National Center for Atmospheric Research - NCAR National Oceanic and Atmospheric Administration - NOAA