Performance Evaluation of GPM IMERG Precipitation Products over the Tropical Oceans Using Buoys

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60460709%3A41330%2F23%3A97898" target="_blank" >RIV/60460709:41330/23:97898 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1175/JHM-D-22-0216.1" target="_blank" >https://doi.org/10.1175/JHM-D-22-0216.1</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1175/JHM-D-22-0216.1" target="_blank" >10.1175/JHM-D-22-0216.1</a>

Result language

angličtina

Original language name

Performance Evaluation of GPM IMERG Precipitation Products over the Tropical Oceans Using Buoys

Original language description

The majority of global precipitation falls in tropical oceans. Nonetheless, due to the lack of in situ precipitation measurements, the number of studies over the tropical oceans remains limited. Similarly, the performance of IMERG products over the tropical oceans is unknown. In this context, this study quantitatively evaluates the 20 years (2001–20) of IMERG V06 Early, Late, and Final products against the in situ buoys’ estimates using the pixel–point approach at a daily scale across the tropical oceans. Results show that IMERG represents well the mean spatial pattern and spatial variation of precipitation, though significant differences exist in the magnitude of precipitation amount. Overall, IMERG notably overestimates precipitation across the tropical ocean, with maxima over the western Pacific and Indian Oceans, while it performs better over the eastern Pacific and Atlantic Oceans. Moreover, irrespective of the region, IMERG sufficiently de-tects precipitation events (i.e., >0.1 mm day21) for high<precipitation regions, though it significantly overestimates the magnitude. Despite IMERG’s detection issues of precipitation events over the regions with lower precipitation, it is in good agreement with the buoys in total precipitation estimation. The positive hit bias and false alarm bias are the major contributions to the overall total positive bias. Furthermore, the detection capability of IMERG tends to decline with increasing precipitation rates. In terms of IMERG runs, the IMERG Final product performs slightly better than the Early and Late runs. More detailed studies over the tropical oceans are required to better characterize the biases and their sources.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10509 - Meteorology and atmospheric sciences

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

JOURNAL OF HYDROMETEOROLOGY

ISSN

1525-755X

e-ISSN

1525-755X

Volume of the periodical

24

Issue of the periodical within the volume

10

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

16

Pages from-to

1755-1770

UT code for WoS article

001112566700002

EID of the result in the Scopus database

2-s2.0-85174175898