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GPM/DPR Level-3 Algorithm Theoretical Basis Document (ATBD)

Date Last Updated
July 1st, 2021
Document Description

The Level-3 radar products provide daily and monthly global statistics of the Level-2 Ku, Ka and DPR products on a latitude-longitude grid. In version 7 (V07), the organization of the products has changed with the highest-level categorization into FS (full swath), MS (matched or inner swath) and HS (high sensitivity) swath products. The next level of division is into high and low spatial resolution grids that are defined such that the low-resolution grid (G1) is 50×50 (lat×lon) while the high-resolution grid (G2) is 0.250× 0.250.

File Downloads
ATBD_DPR_L3_V7.pdf

Goddard Convective-Stratiform Heating (CSH) Algorithm

Document Description

Latent heating (LH) cannot be measured directly with current techniques, including current remote sensing or in situ instruments, which explains why nearly all satellite retrieval schemes depend heavily on some type of cloud-resolving model or CRM (Tao et al. 2006, 2016). This is true for the current CSH algorithm (Tao et al. 2010).

Input: Combined 2BCMB (DPR + GMI) rainfall products

GPM Satellite Reveals Intensity Of Powerful Storms In The Timor Sea

GPM Satellite Reveals Intensity Of Powerful Storms In The Timor Sea
The GPM satellite flew over a stormy area of the Timor Sea northwest of Australia on February 7, 2017 at 1926Z. GPM found that this stormy area contained some extremely powerful convective storms. GPM's Dual-Frequency Precipitation Radar (DPR) found that the most intense storms were dropping rain at a rate of over 268 mm (10.6 inches) per hour. Data received by GPM's Radar (DPR Ku Band) also revealed the 3-D anatomy of precipitation hidden inside these unusually powerful storms. GPM's radar found that these storm tops were pushing to altitudes greater than 19 km (11.8 miles). GPM radar data

GPM Sees Carlos Moving Past Reunion Island

GPM Sees Carlos Moving Past Reunion Island
The GPM core observatory satellite flew above tropical cyclone Carlos on February 7, 2017 at 1056 UTC. Carlos was moving past Reunion Island with maximum sustained winds estimated at 45 kts (51.8 mph). GPM's Microwave Imager (GMI) and Dual-Frequency Precipitation Radar (DPR) data show that rain bands west of Carlos' center were producing heavy rainfall. GPM's DPR swath is shown in a lighter shade. DPR measured a few downpours in the bands west of the Carlos' center of circulation dropping rain at a rate of over 120 mm (4.7 inches) per hour. GPM's radar (DPR Ku Band) found that a few storm tops

Tropical Storm Carlos Forms

Tropical Storm Carlos Forms
Tropical storm Carlos formed in the Southwest Indian Ocean north of the French Islands of Reunion and Mauritius on February 4, 2017 (UTC). This ended an unusual drought of tropical cyclone formation in that part of the Indian Ocean that began in July 2016. NASA's GPM core observatory satellite flew above tropical storm Carlos on February 5, 2017 at 1056 UTC when Carlos had maximum sustained winds of about 45 kts (51.8 mph). GPM collected data that showed the intensity and structure of precipitation within Carlos. GPM's Dual-Frequency Precipitation Radar (DPR) measured rain falling at a rate of

GES DISC FTP to HTTPS Transition

The Goddard Earth Sciences Data and Information Services Center (GES DISC) will soon be completing its transition from FTP access to HTTPS access using NASA Earthdata Login. This transition will require GES DISC users to register with NASA Earthdata Login if they haven't already done so. To learn more about NASA Earthdata Login and registering for an account, please see https://wiki.earthdata.nasa.gov/display/EL/How+To+Register+With+Earthda… GES DISC will begin this transition starting Feb 13 2017, and expects to complete the transition mid-March. Users who currently access GES DISC

GPM Sees Possible Tropical Cyclone Developing Near Australia

GPM Sees Possible Tropical Cyclone Developing
So far this year no tropical cyclones have developed in the Southwest Indian Ocean. The Joint Typhoon Warning Center (JTWC) recently warned that a low moving westward over northwestern Australia may soon become a tropical cyclone. Warm Indian Ocean waters and low vertical wind shear are providing a good environment for tropical cyclone development. The GPM satellite flew over northwestern Australia on January 25, 2017 at 2351 UTC. GPM's Microwave Imager (GMI) and Dual-Frequency Precipitation Radar (DPR) measured precipitation within strong convection in the Indian Ocean northwest of the lows

Mudslides & Flooding Produced By Extreme Rainfall Over Southern California

Mudslides & Flooding Produced By Extreme Rainfall Over Southern California
It is sunny in southern California today but recent unusually heavy rainfall led to rock slides, mudslides and flooding in that part of the country. Rainfall of almost 4 inches (101.6 mm) in one day was reported in Long Beach, California. Some highways in the area were flooded due to intense downpours. Rainfall since the fall of 2016 has improved drought conditions over northern California but Southern California has been slower to improve because of the exceptional rainfall deficit in that area. NASA's Integrated Multi-satellitE Retrievals for GPM (IMERG) were used to estimate the total

Atmospheric River Slams California

Atmospheric River Slams California
Monday, January 23, 2017
After more than four years of drought, Californians may wonder where the current rain is coming from. Using satellites, NASA scientists have a unique view of the sources of precipitation, and how it reaches the western United States. Rain is often carried by narrow tendrils of moisture called atmospheric rivers that occur all over the world, shown here in white. The atmospheric rivers that affect the western United States are known as the Pineapple Express because they transport water vapor from as far south as Hawaii to California. When the moisture reaches land, it is forced up over the...
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