Ziad S. Haddad
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View article: From RainCube to INCUS: Using Miniaturized Microwave Instruments to Analyze the Dynamics of Tropical Convection
From RainCube to INCUS: Using Miniaturized Microwave Instruments to Analyze the Dynamics of Tropical Convection Open
This narrative tells the story of how NASA's INCUS (INvestigation of Convective UpdraftS) mission was conceived and designed, to identify and flesh out a scientific investigation that would be conducted using newly developed miniaturized w…
View article: Time Resolved Reflectivity Measurements of Convective Clouds
Time Resolved Reflectivity Measurements of Convective Clouds Open
National Aeronautics and Space Administration's Investigations of Convective Updrafts (INCUS) mission aims to document convective mass flux through changes in the radar reflectivity (Δ Z ) in convective cores captured by a constellation of…
View article: Time resolved reflectivity measurements of convective clouds
Time resolved reflectivity measurements of convective clouds Open
NASA’s Investigations of Convective Updrafts (INCUS) mission aims to document convective updraft mass flux through changes in the radar reflectivity (ΔZ) in convective cores captured by a constellation of three Ka-band radars sampling the …
View article: Quantifying the Vertical Transport in Convective Storms Using Time Sequences of Radar Reflectivity Observations
Quantifying the Vertical Transport in Convective Storms Using Time Sequences of Radar Reflectivity Observations Open
A new satellite observation concept to estimate upward air mass flux in convective storms has been proposed using a convoy of small radars that measure reflectivity only. The approach is to analyze a pair of radar reflectivity profiles obt…
View article: Tropical Convection through the Lens of the INCUS Mission
Tropical Convection through the Lens of the INCUS Mission Open
The convective mass flux within tropical convection influences the large-scale circulation, drives cloud radiative forcing, has integral links to the production of fresh water, and impacts extreme weather. CMF forms the focus of the recent…
View article: Isabel Simulation Data for JGR-Atmospheres
Isabel Simulation Data for JGR-Atmospheres Open
The model-simulated atmospheric fields (including condensed water content, vertical velocity, and radar reflectivity factors, as described in section 3). The file name format is starttime_endtime_INCUS_Isabel.mat, with “starttime” and “end…
View article: Time-Delayed Tandem Microwave Observations of Tropical Deep Convection: Overview of the C2OMODO Mission
Time-Delayed Tandem Microwave Observations of Tropical Deep Convection: Overview of the C2OMODO Mission Open
Convective clouds serve as a primary mechanism for the transfer of thermal energy, moisture, and momentum through the troposphere. Arguably, satellite observations are the only viable way to sample the convective updrafts over the oceans. …
View article: Observation strategy of the INCUS mission: retrieving vertical mass flux in convective storms from low-earth-orbit convoys of miniaturized microwave instruments
Observation strategy of the INCUS mission: retrieving vertical mass flux in convective storms from low-earth-orbit convoys of miniaturized microwave instruments Open
<p>Microwave radiometers and radars in low Earth orbit (LEO) are sensitive to the amount of condensed water in clouds. However, their temporal sampling is quite limited &#8211; a single LEO instrument will very rarely observe a w…
View article: The Joint IPWG/GEWEX Precipitation Assessment
The Joint IPWG/GEWEX Precipitation Assessment Open
This report reviews the current state of precipitation products, and includes assessments of sub-daily global satellite precipitation products, discussions of various climate applications of precipitation products, and deliberations on eme…
View article: Evaluation of Higher-order Quadrature Schemes in Improving Computational Efficiency for Orientation-averaged Single-Scattering Properties of Nonspherical Ice Particles
Evaluation of Higher-order Quadrature Schemes in Improving Computational Efficiency for Orientation-averaged Single-Scattering Properties of Nonspherical Ice Particles Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Journal of Geophysical Research - Atmospheres. ESSOAr is a venue for early communication or feedback before peer review. Data may be pre…
View article: A Set of Orientation-averaged Single-Scattering Properties of Nonspherical Ice Particles computed with MIDAS and DDSCAT
A Set of Orientation-averaged Single-Scattering Properties of Nonspherical Ice Particles computed with MIDAS and DDSCAT Open
We evaluate several high-order quadrature schemes for accuracy and efficacy in obtaining orientation-averaged single-scattering properties (SSPs). We use the highly efficient MIDAS (formerly NESCoP) to perform electromagnetic scattering ca…
View article: A Set of Orientation-averaged Single-Scattering Properties of Nonspherical Ice Particles computed with MIDAS and DDSCAT
A Set of Orientation-averaged Single-Scattering Properties of Nonspherical Ice Particles computed with MIDAS and DDSCAT Open
We evaluate several high-order quadrature schemes for accuracy and efficacy in obtaining orientation-averaged single-scattering properties (SSPs). We use the highly efficient MIDAS (formerly NESCoP) to perform electromagnetic scattering ca…
View article: Assimilation of DAWN Doppler wind lidar data during the 2017 Convective Processes Experiment (CPEX): impact on precipitation and flow structure
Assimilation of DAWN Doppler wind lidar data during the 2017 Convective Processes Experiment (CPEX): impact on precipitation and flow structure Open
An improved representation of 3-D air motion and precipitation structure through forecast models and assimilation of observations is vital for improvements in weather forecasting capabilities. However, there are few independent data to pro…
View article: Vertical precipitation profiles estimated by satellite-based passive microwave retrievals
Vertical precipitation profiles estimated by satellite-based passive microwave retrievals Open
<p>Passive microwave (MW) observation from low Earth-orbiting satellites is one of the major sources of information for global precipitation monitoring. Although various precipitation retrieval techniques based on passive MW observat…
View article: Eyes on the Storms: JPL’s Tropical Cyclone Information System
Eyes on the Storms: JPL’s Tropical Cyclone Information System Open
An unusual number of tropical systems in the Atlantic, captured in this TCIS visualization, were all evolving simultaneously on 15 September during the record-breaking 2020 hurricane season.
View article: Impact of Microphysical Parameterizations on Simulated Hurricanes—Using Multi-Parameter Satellite Data to Determine the Particle Size Distributions that Produce Most Realistic Storms
Impact of Microphysical Parameterizations on Simulated Hurricanes—Using Multi-Parameter Satellite Data to Determine the Particle Size Distributions that Produce Most Realistic Storms Open
Understanding and forecasting hurricanes remains a challenge for the operational and research communities. To accurately predict the Tropical Cyclone (TC) evolution requires properly reflecting the storm’s inner core dynamics by using: (i)…
View article: Assimilation of DAWN Doppler Wind Lidar Data During the 2017Convective Processes Experiment (CPEX): Impact on thePrecipitation and Flow Structure
Assimilation of DAWN Doppler Wind Lidar Data During the 2017Convective Processes Experiment (CPEX): Impact on thePrecipitation and Flow Structure Open
An improved representation of the 3-D air motion and precipitation structure through forecast models and assimilation of observations is vital for improvements in weather forecasting capabilities. However, there is little independent data …
View article: Evaluation of Higher-order Quadrature Schemes in Improving Computational Efficiency for Orientation-averaged Single-Scattering Properties of Nonspherical Ice Particles
Evaluation of Higher-order Quadrature Schemes in Improving Computational Efficiency for Orientation-averaged Single-Scattering Properties of Nonspherical Ice Particles Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Journal of Geophysical Research - Atmospheres. ESSOAr is a venue for early communication or feedback before peer review. Data may be pre…
View article: Evaluation of Precipitation Vertical Profiles Estimated by GPM-Era Satellite-Based Passive Microwave Retrievals
Evaluation of Precipitation Vertical Profiles Estimated by GPM-Era Satellite-Based Passive Microwave Retrievals Open
Precipitation estimation based on passive microwave (MW) observations from low-Earth-orbiting satellites is one of the essential variables for understanding the global climate. However, almost all validation studies for such precipitation …
View article: An Eye on the Storm: Integrating a Wealth of Data for Quickly Advancing the Physical Understanding and Forecasting of Tropical Cyclones
An Eye on the Storm: Integrating a Wealth of Data for Quickly Advancing the Physical Understanding and Forecasting of Tropical Cyclones Open
Tropical cyclones (TCs) are among the most destructive natural phenomena with huge societal and economic impact. They form and evolve as the result of complex multiscale processes and nonlinear interactions. Even today the understanding an…
View article: Decadal trends in convection from satellite microwave observations of near-surface wind and deep precipitating clouds
Decadal trends in convection from satellite microwave observations of near-surface wind and deep precipitating clouds Open
<p>Since the past decade, evidence derived from model reanalysis (including outgoing longwave radiation, tropopause height, the latitude where zonal mean precipitation exceeds evaporation, and the latitude where the zonal mean 500-hP…
View article: Improving Satellite-Based Subhourly Surface Rain Estimates Using Vertical Rain Profile Information
Improving Satellite-Based Subhourly Surface Rain Estimates Using Vertical Rain Profile Information Open
Quantifying time-averaged rain rate, or rain accumulation, on subhourly time scales is essential for various application studies requiring rain estimates. This study proposes a novel idea to estimate subhourly time-averaged surface rain ra…
View article: A low-wavenumber analysis of the environmental and vortex-scale variables responsible for rapid intensity changes in landfalling tropical cyclones
A low-wavenumber analysis of the environmental and vortex-scale variables responsible for rapid intensity changes in landfalling tropical cyclones Open
Forecasting rapid intensity changes in tropical cyclones (TCs) is hard as the factors responsible span many scales. External and internal dynamical and thermodynamical variables act simultaneously in a nonlinear fashion, either complementi…
View article: Objective Characterization of Rain Microphysics: Validating a Scheme Suitable for Weather and Climate Models
Objective Characterization of Rain Microphysics: Validating a Scheme Suitable for Weather and Climate Models Open
Improving the atmospheric component of hydrological models is beneficial for applications such as water resources assessment and hydropower operations. Within this goal, precise characterization of rain microphysics is key for climate and …
View article: The role of upper level diffluence in the Tropical Easterly Jet in the formation of the recent strongest Atlantic hurricanes
The role of upper level diffluence in the Tropical Easterly Jet in the formation of the recent strongest Atlantic hurricanes Open
In this paper we report the evidence of the potential role of diffluence in the 200hPa wind field off the coast of West Africa in the formation of a significant number of Category 4 and Category 5 hurricanes in the recent decade. It is sho…
View article: Soil Moisture and Vegetation Water Content Retrieval Using QuikSCAT Data
Soil Moisture and Vegetation Water Content Retrieval Using QuikSCAT Data Open
No abstract available.
View article: An observationally based method for stratifying <i>a priori</i> passive microwave observations in a Bayesian‐based precipitation retrieval framework
An observationally based method for stratifying <i>a priori</i> passive microwave observations in a Bayesian‐based precipitation retrieval framework Open
Estimation of precipitation from space‐based passive microwave (PMW) radiometric brightness temperature (TB) observations that adapts to the wide variety of Earth surface background and environmental conditions is a long‐standing issue. Si…