Impacts of climate changes on the phytoplankton biomass of the Indonesian Maritime Continent

Siswanto, Eko; Horii, Takanori; Iskandar, Iskhaq; Gaol, Jonson Lumban; Setiawan, Riza Yuliratno; Susanto, R. Dwi

doi:10.1016/j.jmarsys.2020.103451

Cited by 31 publications

(28 citation statements)

References 28 publications

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“…Researchers have documented coastal upwelling off Java since the earliest oceanographic studies [21]. The coastal upwelling in the EIO off Java has a strong seasonal cycle [27][28][29][30][31]. These previous studies showed that the difference in SST between the southeast monsoon (upwelling) and northwest monsoon (downwelling) was only around 2.00 • C, and thermocline rose up to 40 m in the Palabuhanratu Bay [32].…”

Section: Discussionmentioning

confidence: 99%

Impact of the Strong Downwelling (Upwelling) on Small Pelagic Fish Production during the 2016 (2019) Negative (Positive) Indian Ocean Dipole Events in the Eastern Indian Ocean off Java

Lumban-Gaol

Siswanto

Mahapatra

et al. 2021

Climate

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Although researchers have investigated the impact of Indian Ocean Dipole (IOD) phases on human lives, only a few have examined such impacts on fisheries. In this study, we analyzed the influence of negative (positive) IOD phases on chlorophyll a (Chl-a) concentrations as an indicator of phytoplankton biomass and small pelagic fish production in the eastern Indian Ocean (EIO) off Java. We also conducted field surveys in the EIO off Palabuhanratu Bay at the peak (October) and the end (December) of the 2019 positive IOD phase. Our findings show that the Chl-a concentration had a strong and robust association with the 2016 (2019) negative (positive) IOD phases. The negative (positive) anomalous Chl-a concentration in the EIO off Java associated with the negative (positive) IOD phase induced strong downwelling (upwelling), leading to the preponderant decrease (increase) in small pelagic fish production in the EIO off Java.

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Section: Discussionmentioning

confidence: 99%

Impact of the Strong Downwelling (Upwelling) on Small Pelagic Fish Production during the 2016 (2019) Negative (Positive) Indian Ocean Dipole Events in the Eastern Indian Ocean off Java

Lumban-Gaol

Siswanto

Mahapatra

et al. 2021

Climate

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“…Winds strongly affected the strait's upper layer flow, especially during the boreal summer (southeast monsoon) from April to October, and even to December, in 2006. Strong, easterly, wind-induced upwelling generated lower sea levels along the southern coasts of the Nusa Tenggara island chain during the southeast mon-soon (Wyrtki, 1987;Susanto et al, 2001), creating a stronger north-south pressure gradient and increasing the southward ITF flow (Susanto and Marra, 2005;Iskandar et al, 2009;Ningsih et al, 2013;Siswanto et al, 2020;Wirasatriya et al, 2020). The prolonged anomalous easterly winds extended until December because 2006 was an El Niño year (Niño3.4 positive) and the Indian Ocean Dipole Mode Index was also positive, (Horii et al, 2008;Iskandar et al, 2009), thus inducing more vigorous upwelling along the southern coasts of the island chain and driving a more substantial southward flow (ITF).…”

Section: Wind Currents and Temperature In The Alas Straitmentioning

confidence: 99%

Moored Observations of Current and Temperature in the Alas Strait: Collected for Submarine Tailing Placement, Used for Calculating the Indonesian Throughflow

Susanto¹,

Waworuntu²,

Prayogo³

et al. 2021

Oceanog

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Newly released current velocity and temperature measurements in the Alas Strait collected from November 2005 to February 2007 permit calculation of the mean and variable transport of the Indonesian Throughflow (ITF) in this region. These data were collected by the Environmental Division of the Amman Mineral Nusa Tenggara mining company to serve as a guide for the deep submarine placement of tailings produced by the Batu Hijau open pit copper-gold mine. Ocean currents, temperatures, and winds in the Alas Strait region exhibit intraseasonal and seasonal variability, with modulation at interannual timescales that may be associated with intraseasonal Kelvin waves, the regional southeast monsoon, the El Niño Southern Oscillation, and the Indian Ocean Dipole (IOD). Currents in the Alas Strait were found to flow steadily southward not only during the boreal summer from mid-April to October but also when a prolonged anomalously easterly wind associated with positive IOD extended this flow direction through the end of December 2006. A steady shear between the northward-flowing upper layer and the southward-flowing layer beneath was recorded from November 2005 to early April 2006 and from January to February 2007. The 2006 annual transport was –0.25 Sv toward the Indian Ocean and varied from 0.4 Sv in early April 2006 to –0.75 Sv in August 2006. Hence, Alas Strait transport plays a dual role in the total ITF, increasing it during boreal summer and reducing it during boreal winter. Northward flows tend to carry warmer water from the Indian Ocean to the Flores Sea, while the southward ITF flow carries cooler water to the Indian Ocean. Although the Alas Strait is located next to the Lombok Strait—one of the major ITF exit passages—they have different current and temperature characteristics. For a more complete evaluation of the ITF, the Alas Strait must be included in any future monitoring.

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“…Sea surface winds play a pivotal role in regulating ocean surface dynamics in the Indonesian Seas. Typically, the northwesterly (southeasterly) winds exert downwelling (upwelling) in many coastal areas in the Indonesian Seas, as indicated by high (low) sea surface temperature (SST) (Setiawan et al, 2019;Siswanto et al, 2020;Wirasatriya et al, 2020a;Kurniawati et al, 2021;Muskananfola et al, 2021). Wind variability in the region is principally affected by the Australian Indonesian Monsoon (AIM) system, which generates the prevailing of northwesterly winds from December to February (Austral summer) and the southeasterly winds from June to September (Austral winter) (Gordon, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…Sea surface condition of the Indonesian Seas is also modulated by the El Niño-Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD), i.e. the sea surface experiences fierce wind forcing during the El Niño/positive IOD year and weak wind forcing during the La Niña/negative IOD year (Susanto and Marra, 2005;Susanto et al, 2006;Iskandar et al, 2017;Setiawan et al, 2019;Siswanto et al, 2020;Wirasatriya et al, 2020b;Kurniawati et al, 2021). These two climate modes may have exerted an essential role in controlling health of the marine environment and fish resource distribution in the Indonesian Seas.…”

Section: Introductionmentioning

confidence: 99%

Seasonal and interannual coastal wind variability off the central Maluku Islands revealed by satellite oceanography

2022

Global NEST: The International Journal

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<p>The Maluku Islands (henceforth MI) are situated in the northeastern Indonesia. Ocean region off the central MI is pivotal as it provides a course for the Indonesian Throughflow (ITF) through the Lifamatola passage. However, sea surface dynamics off the central MI is unknown until recently due to inadequate measurements. The current fact motivates the present study to decipher the coastal wind variability off the central MI and its effect on the sea surface by analysing long-term datasets (2007-2019) of satellite-derived sea surface wind, sea surface temperature (SST), and surface chlorophyll-a concentration. Possible influence of extreme climate events of the 2015 El Niño-Southern Oscillation (ENSO) and the 2019 Indian Ocean Dipole (IOD) on all oceanographic parameters was also examined. Results show that the prevailing southeasterly winds over the central MI induce SST cooling and phytoplankton bloom. Correlation analysis revealed that the ENSO and IOD play significant roles in defining spatial distribution of the coastal wind, SST, and phytoplankton bloom in the research area. In addition, the anomaly analysis exhibits distinct oceanographic features during the climate extreme events of 2015 and 2019. Collectively, results of the present research highlight the importance of coastal wind variability and extreme events in shaping the ocean surface characteristics and perhaps regional fisheries production.</p>

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Impacts of climate changes on the phytoplankton biomass of the Indonesian Maritime Continent

Cited by 31 publications

References 28 publications

Impact of the Strong Downwelling (Upwelling) on Small Pelagic Fish Production during the 2016 (2019) Negative (Positive) Indian Ocean Dipole Events in the Eastern Indian Ocean off Java

Impact of the Strong Downwelling (Upwelling) on Small Pelagic Fish Production during the 2016 (2019) Negative (Positive) Indian Ocean Dipole Events in the Eastern Indian Ocean off Java

Moored Observations of Current and Temperature in the Alas Strait: Collected for Submarine Tailing Placement, Used for Calculating the Indonesian Throughflow

Seasonal and interannual coastal wind variability off the central Maluku Islands revealed by satellite oceanography

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