Agenda of the Meteorology and Air Quality Group

MAQ Colloquium announcement

22 February 2021, 16.00 - 16.45 uur Teams

Speaker: Anis Purwaningsih (MSc thesis)

Title: SEASONAL Moisture SOURCE OF DAILY extreme
precipitation over JAVA, INDONESIA

Abstract: Java Island, Indonesia, is highly vulnerable to hydrometeorological
disasters as a result of extreme precipitation. Java’s precipitation varies in
temporal and spatial scales due to different atmospheric circulation patterns.
To better understand these patterns, this study investigates the seasonal
moisture sources of extreme rainfall over Southern Java (SJ) and Northern Java
(NJ). We defined the characteristics of precipitation and extreme precipitation
based on ERA-Interim data during the 2001-2018 period. We used the Water
Accounting Model 2 Layers (WAM-2layers) to track precipitation back in time to
determine the moisture source of extreme rainfall over a specific location
(SJ/NJ) for every season (DJF, MAM, JJA, SON) during 1987-2018. We performed a
composite analysis of the extreme precipitation moisture sources. Results show
that daily precipitation over Java spatially ranges from 4 to 10 mm/day, and
extreme daily precipitation ranges from 20mm/day until 45 mm/day. The seasonal
precipitation indicates that Java is experiencing a wet season in DJF and a dry
season in JJA,  in accordance with the Asia-Australia monsoon. The
threshold of extreme rainfall spatially ranges from 20-80mm/day during DJF and
less than 30 mm/day during JJA. Moreover, the composites illustrate that the
moisture source of extreme precipitation over SJ and NJ have a relatively
similar spatial pattern; however, the moisture sources are located relatively
closer to the location of extreme precipitation (either SJ or NJ). The moisture
source of extreme precipitation over Java is from evaporation over both the
northern and southern hemispheres, and the ocean contribution is higher than
the land contribution. During DJF, the extreme precipitation over Java is from
evaporation over the south region (mainly from The Indian Ocean) and the
northern regions (The South China Sea, and the Pacific Ocean). During JJA,
Australia is considered the crucial terrestrial moisture source of extreme
precipitation over both NJ and SJ. In the same season, the Pacific ocean, Gulf
of Carpentaria, and surrounding are oceanic moisture sources of extreme
rainfall.

Supervisor: Imme Benedict and Chiel van Heerwaarden

=================================================
MAQ Colloquium announcement

1 March 2021, 16.00 - 16.45 uur Teams

Speaker: Mirjam Tijhaar (MSc thesis)

Title:

Abstract:

Supervisor: Chiel van Heerwaarden

==================================================

MAQ Colloquium announcement

8 March 2021, 16.00 - 16.30 uur Teams

Speaker:  Raquel Gonzalez Armas (MSc thesis)

Title:

Abstract:

Supervisor: Martin Janssens

==================================================

MAQ Colloquium announcement

8 March 2021, 16.30 - 17.00 uur Teams

Speaker:  Mathijs Groenink (MSc thesis)

Title:

Abstract:

Supervisor: Ingrid Luijkx

==================================================

MAQ Colloquium announcement

15 March 2021, 16.00 - 16.45 uur Teams

Speaker:  Jeroen Sonnemans (MSc thesis)

Title:

Abstract:

Supervisor: Imme Benedict

==================================================

MAQ Colloquium announcement

22 March 2021, 16.00 - 16.45 uur Teams

Speaker: Robbert Moonen (MSc thesis)

Title:

Abstract:

Supervisor: Oscar Hartogensis

==================================================

MAQ Colloquium announcement

29 March 2021, 16.00 - 16.45 uur Teams

Speaker:  Jane Roque Mamani (MSc thesis)

Title:

Abstract:

Supervisor: Oscar Hartogensis