Jason Lee Pippitt

NASA · Earth Sciences Division (Goddard)

The BiLateral Operational Storm‐Scale Observation and Modeling (BLOSSOM) project was initiated to establish a long‐term supersite to improve understanding of cloud physical states and processes as well as to support satellite and climate model programs over the Wallops Flight Facility site via a bilateral approach of storm‐scale observations and pr...

The integrated Multi-satellitE Retrievals for GPM (IMERG) Version V05B and V06B precipitation products from the Global Precipitation Measurement (GPM) mission are validated against ground-based observations from the Kwajalein Polarimetric S-band Weather Radar (KPOL) deployed at Kwajalein Atoll in the central Pacific Ocean. Such a validation is part...

The Wallops Precipitation Research Facility (WPRF) at NASA Goddard Space Flight Center, Wallops Island, Virginia, has been established as a semipermanent supersite for the Global Precipitation Measurement (GPM) Ground Validation (GV) program. WPRF is home to research-quality precipitation instruments, including NASA’s S-band dual-polarimetric radar...

A unique capability of the Global Precipitation Measurement (GPM) mission is its ability to better estimate the raindrop size distribution (DSD) on a global scale. To validate the GPM DSD retrievals, a network of more than 100 ground-based polarimetric radars from across the globe are utilized within the broader context of the GPM Validation Networ...

The ground-based radar derived raindrop size distribution (DSD) parameters, mass weighted drop diameter (D mass ) and normalized intercept parameter (N W ), are the sole resource for direct validation of the National Aeronautics and Space Administration (NASA) Global Precipitation Measurement (GPM) mission core satellite based retrieved DSD. Both D...

Hurricane Harvey hit the Texas Gulf Coast as a major hurricane on 25 August 2017 before exiting the state as a tropical storm on 29 August 2017. Left in its wake was historic flooding, with some locations measuring more than 60 in. (150 cm) of rain over a 5-day period. The WSR-88D radar (KHGX) maintained operations for the entirety of the event. Ra...

The Global Precipitation Measurement (GPM) satellite was launched by NASA and JAXA on February 27, 2014. For validation support, an extensive network of approximately 65 weather radars in different meteorological regimes were selected by the GPM GV (ground validation) program to identify biases between ground observations and satellite retrievals....

The recent upgrade of the National Weather Service WSR-88D radar network to dual polarization (DP) and the availability of research DP radars, such as NASA Polarimetric (NPOL) and Kwajalein Polarimetric (KPOL), allows NASA's Precipitation Measuring Missions Ground Validation program (PMM-GV) to capture unique polarimetric data to foster improved un...

Since the Tropical Rainfall Measuring Mission (TRMM) satellite launch in November 1997, the TRMM Satellite Validation Office (TSVO) at NASA Goddard Space Flight Center (GSFC) has been performing quality control and estimating rainfall from the KPOL S-band radar at Kwajalein, Republic of the Marshall Islands. Over this period, KPOL has incurred many...

There are many applications in which the absolute and day-to-day calibrations of radar sensitivity are necessary. This is particularly so in the case of quantitative radar measurements of precipitation. While fine calibrations may be made periodically by a variety of techniques such as the use of antenna ranges, standard targets, and solar radiatio...

The Tropical Rainfall Measuring Mission's (TRMM) Ground Validation (GV) Program was originally established with the principal long-term goal of determining the random errors and systematic biases stemming from the application of the TRMM rainfall algorithms. The GV Program has been structured around two validation strategies: 1) determining the qua...

Evaluation of the Tropical Rainfall Measuring Mission (TRMM) satellite observations is conducted through a comprehensive ground validation (GV) program. Since the launch of TRMM in late 1997, standardized instantaneous and monthly rainfall products are routinely generated using quality-controlled ground-based radar data adjusted to the gauge accumu...

An overview of the Tropical Rainfall Measuring Mission (TRMM) Ground Validation (GV) Program is presented. This ground validation (GV) program is based at NASA Goddard Space Flight Center in Greenbelt, Maryland, and is responsible for processing several TRMM science products for validating space-based rain estimates from the TRMM satellite. These p...

The TRMM Ground Validation (GV) program at NASA GSFC has made considerable progress: over the last several years. The GV program now has a Complete record of Level I-HI products from the Kwajaiein and Melbourne, Florida sites. Current emphasis is to eliminate the remaining backlog for the Houston, Texas and Darwin, Australia sites. This paper provi...

As part of the NASA tropical rainfall measuring mission ground validation (TRMM-GV) program, a field campaign was conducted in Florida Keys during August-September 2002. The purpose of the field campaign was to study the characteristics of rainfall over the Florida Keys, utilizing Key West WSR-88D, NASA's s-band polarimetric radar (NPOL), and a net...

1. INTRODUCTION The QC algorithm chosen by the TRMM Science Team is a modified version of the algorithm developed by Rosenfeld et al. (1995). The algorithm uses eight adjustable parameters, three echo height thresholds, and five radar reflectivity thresholds in the determination of false echo. Algorithm parameters are highly sensitive, and are chos...