Performance Evaluation of GPM IMERG Precipitation Products over the Tropical Oceans Using Buoys
Identifikátory výsledku
Kód výsledku v 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>
Výsledek na webu
<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>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Performance Evaluation of GPM IMERG Precipitation Products over the Tropical Oceans Using Buoys
Popis výsledku v původním jazyce
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.
Název v anglickém jazyce
Performance Evaluation of GPM IMERG Precipitation Products over the Tropical Oceans Using Buoys
Popis výsledku anglicky
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.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10509 - Meteorology and atmospheric sciences
Návaznosti výsledku
Projekt
—
Návaznosti
S - Specificky vyzkum na vysokych skolach
Ostatní
Rok uplatnění
2023
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
JOURNAL OF HYDROMETEOROLOGY
ISSN
1525-755X
e-ISSN
1525-755X
Svazek periodika
24
Číslo periodika v rámci svazku
10
Stát vydavatele periodika
CZ - Česká republika
Počet stran výsledku
16
Strana od-do
1755-1770
Kód UT WoS článku
001112566700002
EID výsledku v databázi Scopus
2-s2.0-85174175898