Seasonal distribution and variability of surface winds in the Indonesian seas using scatterometer and reanalysis data

Alifdini, Inovasita; Shimada, Tatsuya; Wirasatriya, Anindya

doi:10.1002/joc.7101

Cited by 22 publications

(9 citation statements)

References 53 publications

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“…Every dry season known as southeast monsoon (SEM) (June-August), the southeasterly wind blew from Australia to Eurasian Continent, carrying warm and dry air over Indonesian region. In contrast, during rainy season or northwest monsoon (NWM), the northwesterly wind from Eurasian continent carried warm and moist air over the Indonesian region during December-February (Setiawan and Habibie, 2010;Alifdini et al, 2021). The period from March to May and September to November is known as the first and the second transitional seasons.…”

Section: Introductionmentioning

confidence: 99%

Natuna Off-Shelf Current (NOC) Vertical Variability and Its Relation to ENSO in the North Natuna Sea

et al. 2021

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During the northwest monsoon (NWM), southerly flow off the Natuna Islands appeared as the extension of the turning Vietnam coastal jet, known as Natuna off-shelf current (NOC). NOC is generated by the interaction of wind stress and the North Natuna Sea’s bottom topography. The purposes of the present study is to investigate the vertical variability of NOC and its relation to El Niňo Southern Oscillation (ENSO) using Marine Copernicus reanalysis data. The vertical variability refers to the spatial distribution of NOC pattern at the surface layer, thermocline layer, and deep/bottom layer. in 2014 as representative of normal ENSO condition. To investigate the effect of ENSO, the spatial distribution of NOC in 2011 and 2016 were compared which represent the La Niňa and El Niňo conditions, respectively. The results show that NOC starts to generate at the southeast monsoon season to the transition I season and peaks in the northwest monsoon season. The occurrence of NOC is identified at all depth layers with the weakened NOC at the deep layer. Related to the ENSO effect, La Niňa tends to strengthen NOC while El Niňo tends to weaken NOC. These are releted with the strengthening and weakening northerly wind speed during La Niňa and El Niňo, Respectively. During La Niňa events, the NOC occurs more frequently than during El Niňo. Thus, beside affecting the magnitude of NOC, ENSO also influence the frequency occurrence of NOC.

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Section: Introductionmentioning

confidence: 99%

Natuna Off-Shelf Current (NOC) Vertical Variability and Its Relation to ENSO in the North Natuna Sea

et al. 2021

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“…In Indonesia, including Semarang Bay, this is the dry season (Muskananfola et al, 2021a). The monsoon winds blow through the Maritime Continent or the Indonesian seas, mainly over the seas along the routes formed by the coastline of the large islands and the chains of the small islands (Alifdini et al, 2021. In the Indonesian seas, the monsoon wind is a key factor affecting the regional climate and oceanographic conditions (Susanto et al, 2006).…”

Section: Methodsmentioning

confidence: 99%

The Partial Pressure of CO2 and Fluxes of CO2 in Semarang Bay, Indonesia

et al. 2023

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The CO2 characteristics of the Semarang Bay system on the Northern coast of Java were investigated to understand the roles in carbon dioxide flux. The flux of carbon dioxide at the sea surface between seawater and atmosphere is essential for mitigating atmospheric CO2. The aims of this study were to assess the variation of CO2 partial pressure seawater (pCO2sea) and CO2 flux and to analyse the water quality variable which has the larger influence on CO2 flux in the waters of Semarang Bay. The variables in this study were temperature, pH, salinity, and DO. Different methods were adopted in the analysis of water samples: spectrophotometric to measure chlorophyll-a and phosphate and titration method to measure Total Alkalinity (TA) and Dissolved Inorganic Carbon (DIC). A CO2 meter was used to measure the CO2atm. The lowest CO2 flux value was (1.86 mmol CO2 m-2 day-1) during the morning period while the pCO2sea reached 461.04 μatm and CO2 flux 83.79 mmol CO2 m-2 day-1 at night. At noon time, with increased temperature, pCO2sea was 461.04 μatm, and CO2 flux was 83.79 mmol CO2 m-2 day-1. The high concentration of chlorophyll-a ranged between 3.55–4.11 mg.L-1. This chlorophyll-a concentration has a negative correlation with CO2 flux, and it was found that TA and DIC concentrations have no relationship with CO2 flux. Based on PCA analysis, it was found that the variability of CO2 flux in Semarang Bay is influenced by the variability of pCO2sea, sea surface temperature and kwa (affected by wind speed).

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“…Angin berpotensi sebagai sumber pemenuhan kebutuhan energi karena merupakan energi terbarukan yang ramah lingkungan (Dewi et al, 2022). Kajian mengenai angin di laut Indonesia semakin menarik perhatian dalam pengembangan energi angin lepas pantai (Alifdini et al, 2021) . Sejalan dengan hal tersebut, memahami angin di atas laut Indonesia telah menjadi tantangan sejak lama dan semakin penting (Alifdini et al, 2021).…”

Section: Pendahuluan 11 Latar Belakangunclassified

Karakteristik Angin Wilayah Pesisir Utara Pulau Jawa Berdasarkan Variabilitas Monsun

Ma’rufatin,

Yananto,

Pandoe

2024

Jurtekling

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The characteristics of near-surface winds correlated with global phenomena such as monsoons have previously been extensively investigated. However, limited wind data investigations have been conducted in the northern coastal region of Java Island. This research aims to analyze the wind characteristics in this region, focusing on monsoon variability. Statistical analysis and wind rose diagrams analysis were conducted using wind direction and speed data spanning from 2013 to 2022 at three Meteorological Station by the Meteorology, Climatology, and Geophysics Agency (BMKG): Tanjung Priok-North Jakarta, Tanjung Mas-Semarang, and Perak II-Surabaya. The analysis results indicate that North Jakarta has experienced an increasing trend in annual average wind speed over a decade, whereas Semarang and Surabaya have seen a decrease. When influenced by the east and west monsoons, wind speeds in North Jakarta and Semarang are higher than during transition periods I and II. Conversely, in Surabaya, the average value was highest during transition period II compared to the west monsoon, east monsoon, and transition period I. Surabaya's average daily wind speed surpassed that of North Jakarta and Semarang. However, Semarang exhibited the highest maximum wind speed among the three regions. The dominant wind direction aligns with the monsoon wind pattern, whether the west or the east. During the transition season, wind direction tends to be more variable, with the frequency of wind events from the south and southwest occurring least frequently compared to other directions. This preliminary study provides the foundation for advancing the knowledge of meteorological studies, particularly wind, as they relate to hydrometeorological disasters. Abstrak Karakteristik angin dekat permukaan yang dikaitkan dengan fenomena global seperti monsun telah banyak dilakukan riset sebelumnya. Akan tetapi, kajian data angin masih sedikit ditemukan di wilayah pesisir utara Pulau Jawa. Riset ini bertujuan untuk menganalisis karakteristik angin wilayah tersebut berdasarkan variabilitas monsun. Analisis statistik dan analisis diagram wind rose dilakukan untuk data arah dan kecepatan angin tahun 2013–2022 di tiga Stasiun Meteorologi milik Badan Meteorologi, Klimatologi, dan Geofisika (BMKG) yaitu di Tanjung Priok-Jakarta Utara, Tanjung Mas-Semarang, dan Perak II-Surabaya. Hasil analisis menunjukkan bahwa selama sepuluh tahun tersebut di Jakarta Utara telah terjadi peningkatan tren kecepatan angin rata-rata tahunan, sedangkan di Semarang dan Surabaya terjadi penurunan. Saat dipengaruhi monsun timur maupun barat, kecepatan angin di Jakarta Utara dan Semarang lebih tinggi dibanding saat masa peralihan I maupun peralihan II. Akan tetapi, kecepatan angin di Surabaya saat masa peralihan II memiliki nilai rata-rata tertinggi dibandingkan saat periode monsun barat, monsun timur, maupun saat masa peralihan I. Rata-rata kecepatan angin harian di Surabaya lebih tinggi dibanding Jakarta Utara dan Semarang, namun Semarang memiliki nilai maksimum kecepatan angin yang paling tinggi di antara kedua wilayah lainnya. Dominasi arah angin terlihat mengikuti pola angin monsun baik saat terjadi monsun barat, ataupun saat terjadi monsun timur. Arah angin akan cenderung lebih beragam pada saat musim peralihan dengan frekuensi kejadian angin dari selatan maupun barat daya paling sedikit terjadi daripada arah angin lainnya. Studi awal ini sebagai dasar untuk pengayaan ilmu kajian meteorologi terutama angin untuk dikaitkan dengan bencana hidrometeorologi.

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Seasonal distribution and variability of surface winds in the Indonesian seas using scatterometer and reanalysis data

Cited by 22 publications

References 53 publications

Natuna Off-Shelf Current (NOC) Vertical Variability and Its Relation to ENSO in the North Natuna Sea

Natuna Off-Shelf Current (NOC) Vertical Variability and Its Relation to ENSO in the North Natuna Sea

The Partial Pressure of CO2 and Fluxes of CO2 in Semarang Bay, Indonesia

Karakteristik Angin Wilayah Pesisir Utara Pulau Jawa Berdasarkan Variabilitas Monsun

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