Observed Characteristics and Seasonality of the Diurnal Patterns of Precipitation over Metro Manila, Philippines

This study investigates the diurnal pattern of precipitation over Metro Manila in terms of precipitation amount (PA), precipitation frequency (PF), and precipitation intensity (PI) using data from a dense network of automated weather stations from 2013 to 2018. The analysis was conducted for the sou...

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Main Authors: Olaguera, Lyndon Mark P, Llorin, Alyssa Gewell A, Magnaye, Angela Monina T., Cruz, Faye Abigail T, Villarin, Jose Ramon T, Topacio, Xzann Garry Vincent M
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Published: Archīum Ateneo 2024
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Online Access:https://archium.ateneo.edu/physics-faculty-pubs/163
https://doi.org/10.1007/s00704-023-04684-x
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spelling ph-ateneo-arc.physics-faculty-pubs-11622024-04-04T09:09:53Z Observed Characteristics and Seasonality of the Diurnal Patterns of Precipitation over Metro Manila, Philippines Olaguera, Lyndon Mark P Llorin, Alyssa Gewell A Magnaye, Angela Monina T. Cruz, Faye Abigail T Villarin, Jose Ramon T Topacio, Xzann Garry Vincent M This study investigates the diurnal pattern of precipitation over Metro Manila in terms of precipitation amount (PA), precipitation frequency (PF), and precipitation intensity (PI) using data from a dense network of automated weather stations from 2013 to 2018. The analysis was conducted for the southwest (May to September; MJJAS) and northeast (November to March; NDJFM) monsoon seasons, and for the two transition months in April and October to examine the seasonality of the diurnal patterns of precipitation. The area averaged diurnal cycle of PA over Metro Manila during MJJAS shows two peaks around early afternoon (14:00 LST; Local Standard Time), coinciding with the peak of PI, and early evening (18:00 LST), coinciding with the peak of PF. The area averaged diurnal cycle of PA during NDJFM is lower in magnitude than during the MJJAS season and shows three peaks occurring at 01:00 LST, 16:00 LST, and 20:00 LST, in which the first and third peaks nearly coincide with the peaks of PI. During April, two peaks in PA were found between 12:00 − 15:00 LST and 18:00 − 21:00 LST, while during October, PA, PF, and PI all have two peaks between 10:00 LST − 20:00 LST and 21:00 LST − 06:00 LST. Examination of the diurnal variations in surface winds and the contribution of short (1 − 3 consecutive hours), medium (3 − 6 consecutive hours), and long (> 6 consecutive hours) duration events shows that high values of PA in the two seasons and transition months coincide with high surface winds, or where there is surface wind convergence over Metro Manila. In addition, short duration events contributed more to the observed peaks of PA. The results of this study could serve as a basis for improving numerical models in representing the diurnal cycle of precipitation over Metro Manila. 2024-02-01T08:00:00Z text https://archium.ateneo.edu/physics-faculty-pubs/163 https://doi.org/10.1007/s00704-023-04684-x Physics Faculty Publications Archīum Ateneo Atmospheric Sciences Meteorology Oceanography and Atmospheric Sciences and Meteorology Physical Sciences and Mathematics Physics
institution Ateneo De Manila University
building Ateneo De Manila University Library
continent Asia
country Philippines
Philippines
content_provider Ateneo De Manila University Library
collection archium.Ateneo Institutional Repository
topic Atmospheric Sciences
Meteorology
Oceanography and Atmospheric Sciences and Meteorology
Physical Sciences and Mathematics
Physics
spellingShingle Atmospheric Sciences
Meteorology
Oceanography and Atmospheric Sciences and Meteorology
Physical Sciences and Mathematics
Physics
Olaguera, Lyndon Mark P
Llorin, Alyssa Gewell A
Magnaye, Angela Monina T.
Cruz, Faye Abigail T
Villarin, Jose Ramon T
Topacio, Xzann Garry Vincent M
Observed Characteristics and Seasonality of the Diurnal Patterns of Precipitation over Metro Manila, Philippines
description This study investigates the diurnal pattern of precipitation over Metro Manila in terms of precipitation amount (PA), precipitation frequency (PF), and precipitation intensity (PI) using data from a dense network of automated weather stations from 2013 to 2018. The analysis was conducted for the southwest (May to September; MJJAS) and northeast (November to March; NDJFM) monsoon seasons, and for the two transition months in April and October to examine the seasonality of the diurnal patterns of precipitation. The area averaged diurnal cycle of PA over Metro Manila during MJJAS shows two peaks around early afternoon (14:00 LST; Local Standard Time), coinciding with the peak of PI, and early evening (18:00 LST), coinciding with the peak of PF. The area averaged diurnal cycle of PA during NDJFM is lower in magnitude than during the MJJAS season and shows three peaks occurring at 01:00 LST, 16:00 LST, and 20:00 LST, in which the first and third peaks nearly coincide with the peaks of PI. During April, two peaks in PA were found between 12:00 − 15:00 LST and 18:00 − 21:00 LST, while during October, PA, PF, and PI all have two peaks between 10:00 LST − 20:00 LST and 21:00 LST − 06:00 LST. Examination of the diurnal variations in surface winds and the contribution of short (1 − 3 consecutive hours), medium (3 − 6 consecutive hours), and long (> 6 consecutive hours) duration events shows that high values of PA in the two seasons and transition months coincide with high surface winds, or where there is surface wind convergence over Metro Manila. In addition, short duration events contributed more to the observed peaks of PA. The results of this study could serve as a basis for improving numerical models in representing the diurnal cycle of precipitation over Metro Manila.
format text
author Olaguera, Lyndon Mark P
Llorin, Alyssa Gewell A
Magnaye, Angela Monina T.
Cruz, Faye Abigail T
Villarin, Jose Ramon T
Topacio, Xzann Garry Vincent M
author_facet Olaguera, Lyndon Mark P
Llorin, Alyssa Gewell A
Magnaye, Angela Monina T.
Cruz, Faye Abigail T
Villarin, Jose Ramon T
Topacio, Xzann Garry Vincent M
author_sort Olaguera, Lyndon Mark P
title Observed Characteristics and Seasonality of the Diurnal Patterns of Precipitation over Metro Manila, Philippines
title_short Observed Characteristics and Seasonality of the Diurnal Patterns of Precipitation over Metro Manila, Philippines
title_full Observed Characteristics and Seasonality of the Diurnal Patterns of Precipitation over Metro Manila, Philippines
title_fullStr Observed Characteristics and Seasonality of the Diurnal Patterns of Precipitation over Metro Manila, Philippines
title_full_unstemmed Observed Characteristics and Seasonality of the Diurnal Patterns of Precipitation over Metro Manila, Philippines
title_sort observed characteristics and seasonality of the diurnal patterns of precipitation over metro manila, philippines
publisher Archīum Ateneo
publishDate 2024
url https://archium.ateneo.edu/physics-faculty-pubs/163
https://doi.org/10.1007/s00704-023-04684-x
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