Garuda - Garba Rujukan Digital

p-Index From 2019 - 2024

0.444

P-Index

This Author published in this journals

All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences Jurnal Ilmiah Perikanan dan Kelautan Jurnal Perikanan Universitas Gadjah Mada

Riza Yuliratno Setiawan

Department Of Fisheries, Faculty Of Agriculture, Universitas Gadjah Mada. Yogyakarta

Author-ID : 2954404

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Immunology & microbiology

Published : 6 Documents Claim Missing Document

Claim Missing Document

Articles

Wind-driven Coastal Upwelling Along South of Sulawesi Island Abdullah Habibi; Riza Yuliratno Setiawan; Akhmad Yusuf Zuhdy
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 15, No 2 (2010): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

The sea in the vicinity of south of Sulawesi Island (SSI) is influenced by monsoon winds. The present observation shows that coastal upwelling in the region is a dominant process leading to high chlorophyll-a (Chl-a) concentration during southeast (SE) monsoon season. Southeasterly monsoon winds are responsible for the upwelling formation.The objective of the reseach was to describe the wind-driven upwelling occurrence. The bloom increases gradually, starting in May and climbing up to peak value (1.1 mg/m3) in August, then weakens in September. By utilizing a combination of satellite data of sea surface wind vector, sea surface temperature (SST), and surface Chl-a, the physical mechanism of the coastal upwelling in the SSI is investigated. Keywords : coastal upwelling, satellite remote sensing, wind speed, SST, Chl-a, south of Sulawesi island. Perairan di sekitar selatan Pulau Sulawesi dipengaruhi angin monsoon. Observasi menunjukkan bahwa upwelling pantai di perairan tersebut merupakan proses dominan yang menyebabkan meningkatnya konsentrasi klorofil-a selama musim monsoon tenggara. Tujuan penelitian ini adalah menggambarkan kejadian wind-driven upwelling. Angin monsoon dari tenggara adalah penyebab terbentuknya upwelling. Konsentrasi klorofil-a naik secara bertahap, dimulai di bulan Mei dan mencapai maksimum (1.1 mg/m3) di bulan Agustus, kemudian berkurang di bulan September. Menggunakan kombinasi data satelit dari angin permukaan laut, suhu permukaan laut, Chl-a permukaan, mekanisme fisik dari upwelling pantai di perairan di selatan Pulau Sulawesi Kata kunci : upwelling pantai, satelit penginderaan jauh, kecepatan angin, suhu permukaan laut, klorofil-a, selatan Pulau Sulawesi.

SST Cooling in the Indonesian Seas Riza Yuliratno Setiawan; Abdullah Habibi
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 15, No 1 (2010): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Using advance satellite-derived sea surface temperature (SST) and sea surface wind, the characteristics of SST and wind variations in the internal Indonesian Seas (hereafter INA) were investigated. The seasonal cycle of SST in the INA is marked by a cooling in the dry season. The cooling, which occurs during May–August, is maximum in the eastern INA and decreases towards west. This study indicated that the southeasterly monsoon winds play a signicant role in the cooling phenomena in Indonesian Seas. The cooling is first identified in May, while August is its mature phase and it is affected by stronger winds (7-8 m/s) during July. An area with SST lower than 26°C appears in the Banda Sea, representing the coolest region in the INA. The results of the present investigation inferred that SST cooling in the INA is caused by southeast monsoon winds-ocean interaction. Key words: satellite remote sensing, SST cooling, southeast monsoon winds. Menggunakan satelit pemantau suhu permukaan laut (SPL) dan angin permukaan laut telah dikaji karakteristik dari SPL dan angin permukaan laut di perairan Indonesia. Siklus musiman SPL di perairan Indonesia dicirikan dengan “pendinginan” selama musim panas. Pendinginan, yang terjadi dari bulan Mei sampai Agustus, maksimum di perairan Indonesia timur dan minimum di perairan Indonesia barat. Studi ini mengindikasikan bahwa angin monsoon dari arah tenggara berperan penting dalam fenomena pendinginan di perairan Indonesia. Pendinginan pertama kali muncul di bulan Mei dan mencapai maksimum di bulan Agustus. Pendinginan tersebut disebabkan oleh pengaruh angin monsoon yang sangat kuat di bulan Juli. Area dengan SPL di bawah 26°C tampak di Laut Banda, dimana merupakan perairan yang paling dingin di Indonesia. Hasil penelitian menyimpulkan bahwa pendinginan di laut Indonesia disebabkan oleh interaksi angin monsoon tenggara dengan laut. Kata kunci: satelit penginderaan jauh, pendinginan suhu permukaan laut, angin monsoon tenggara

Assessing the Reliability of Planktic Foraminifera Ba/Ca as a Proxy for Salinity off the Sunda Strait Riza Yuliratno Setiawan; Anindya Wirasatriya; Hasrizal Bin Shaari; Eko Setyobudi; Faizal Rachman
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 22, No 4 (2017): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

The Ba/Ca ratio of planktic foraminifera carbonate serves as a new geochemical proxy for seawater Ba/Ca and thus providing information on modern and past salinity and freshwater discharge. In this study the applicability of Ba/Ca ratio of core-top Globigerinoides sacculifer collected off the eastern tropical Indian Ocean (ETIO) for paleoceanographic reconstructions was investigated. In doing so, we conducted a series of cleaning experiments for Ba/Ca extraction by using different reductive solutions. Our new results suggest that the Ba/Ca ratio of G. sacculifer cannot be utilized as a tracer for modern and past salinity changes in the ETIO region off the Sunda Strait. We suggest that the existence of seasonal upwelling adds an additional signal to the seawater Ba/Ca in the ETIO, and thus complicates the interpretation of G. sacculifer Ba/Ca as a freshwater tracer. Moreover, our cleaning experiment results show that the cleaning protocol of Mg/Ca, DTPA, and hydroxylamine can be used to extract valuable Ba/Ca ratios from planktic foraminifera tests. Keywords: G. sacculifer Ba/Ca, foraminifera cleaning experiments, the Sunda Strait.

The Effectiveness of Seaweeds as Biofilter for Reducing Wastewater Nutrient and Preventing Water Pollution from Hybrid Grouper Culture Ratih Ida Adharini; Murwantoko Murwantoko; Namastra Probosunu; Riza Yuliratno Setiawan; Tony Budi Satriyo
Jurnal Ilmiah Perikanan dan Kelautan Vol. 13 No. 2 (2021): JURNAL ILMIAH PERIKANAN DAN KELAUTAN
Publisher : Faculty of Fisheries and Marine Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jipk.v13i2.28105

Highlight ResearchWastewater in hybrid grouper culture should be maintain before resirculate and dispose to aquatic environment to avoid eutrophication.Seaweed that is used for biofilter must be observed for its suitability, performance and effectivity.Ulva sp. has the best effectiveness to reduce nutrient in wastewater of hybrid grouper aquaculture by absorbing then stored into thallus.Ulva sp. is proven has the best SGR and adaptability in wastewater of hybrid grouper culture.AbstractWastewater generated from hybrid grouper culture needs to be managed to improve water quality before being recirculated, or discharged in the aquatic environment. Seaweed biofilter has been proposed in wastewater treatment technology for marine fish farming. This study aimed at comparing which of these species i.e. Ulva sp., Sargassum sp., Gelidium sp., and Dictyota sp.Â work best to absorb nutrient wastewater hybrid grouper culture. This research utilized these seaweed as treatments and controls with three replications using Completely Randomized Design. A statistical analysis was conducted to investigate the significant differences in the nutrient absorptions among various seaweed species by using ANOVAÂ and least significant difference. Non-parametric tests namely Kruskal-Walis, Mann-Whitney, and t-test were used with confidence interval of 95%. The results revealed that Ulva sp. has the best ability to reduce the Nitrogen 80%, while Dictyota able to reduce Â Phosphor 88% by Dictyota sp. generated from wastewater of hybrid grouper culture. While the highest absorbtion of Total Kjeldahl Nitrogen (104%) and phosphate (182%) that stored in thallus were performed by Ulva sp.Â Ulva sp. had the best performance and highest growth rate (1.9% d-1) as biofilter in hybrid grouper cultivation than other species.

Wind-Driven Coastal Upwelling in the Southern Coast of Yogyakarta Faizal Rachman; Ratih Ida Adharini; Riza Yuliratno Setiawan; Indun Dewi Puspita; Endy Triyannanto
Jurnal Perikanan Universitas Gadjah Mada Vol 20, No 1 (2018)
Publisher : Universitas Gadjah Mada

Satellite measurement provides synoptic view of sea surface wind and can be used to study variability of coastal upwelling. Here we analyzed data of 12 years of satellite-derived sea surface wind, sea surface temperature (SST), and sea surface chlorophyll-a (Chl-a) to examine the spatial and temporal distributions of coastal upwelling off the Yogyakarta waters. Results show that upwelling occurs during the Southeast Monsoon (SEM) season. During this season, the Yogyakarta waters are dominated by strong wind speed (~7 m/s) and SST cooling (25 °C). Whereas during the Northwest Monsoon (NWM) season the low wind speed (<4 m/s) no longer favor upwelling and SST cooling. We suggest that as the Yogyakarta coastline is oriented east-west, northwesterly winds result in downwelling condition at the coast, while southeasterly winds lead to the offshore Ekman transport of surface water and subsequent upwelling.

Identification of Potential Locations for Kappaphycyus alvarezii Cultivation for Optimization of Seaweed Production Based on Geographic Information Systems in Spermonde Archipelago Waters, South Sulawesi, Indonesia Sarjito Sarjito; Hanny Ammaria; Muhammad Helmi; Slamet Budi Prayitno; Nurjannah Nurdin; Riza Yuliratno Setiawan; Parichat Wetchayont; Anindya Wirasatriya
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 27, No 3 (2022): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.27.3.253-266

Indonesia is the second largest producer of red algae in the world with one of the major Kappaphycyus. alvarezii farming areas is in Spermonde Islands, Pangkep Regency, South Sulawesi Province. K. alvarezii production in Pangkep Regency increased every year. However, the availability of natural seaweed can be threatened along with the increasing demand so that seaweed cultivation is necessary. Proper site selection is crucial to guarantee the success of the seaweed farming development. A Geographic Information system (GIS) with geospatial modeling approach was applied for identification of the site selection for K. alvarezii cultivation at the Liukang Tuppabiring District, Spermonde Islands by combining various physical and chemical parameters obtained from in-situ data and hydrodynamics modeling. The parameters are Sea Surface Temperature, salinity, pH, substrate type, current speed, wave height, DO, nitrate, phosphate, and Total Suspended Solid. This research also include the accessibility and the restricted area of shipping lanes for determining the area suitability of K. alvarezii cultivation. This research demonstrates a Geographic Information system with the cell-based geospatial modeling can be effectively used and found the the suitable categorized area for K. alvarezii is 4,546.28 ha, which is the combination of the suitable area of 4,463.08 ha and highly suitable criteria with an area of 83.2 ha. The potential productivity of wet-weight seaweed can reach 56,825 tons per cycle or 113,650 tons per year. This result suggests the GIS with geospatial modeling approach for developing the area of K. alvarezii culture can be applied in other area.

Co-Authors Abdullah Habibi Abdullah Habibi Akhmad Yusuf Zuhdy Anindya Wirasatriya Anindya Wirasatriya Eko Setyobudi Faizal Rachman Faizal Rachman Hanny Ammaria Hasrizal Bin Shaari Indun Dewi Puspita Muhammad Helmi Murwantoko . Namastra Probosunu Nurdin, Nurjannah Parichat Wetchayont Ratih Ida Adharini Sarjito Sarjito Slamet Budi Prayitno Tony Budi Satriyo Triyannanto, Endy

Title

Found 6 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 6 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 6 Documents
Search