Sri Yudawati Cahyarini
Geotechnology Research Centre, Indonesian Institute of Sciences Kompleks LIPI, Jl. Sangkuriang, Bandung 40135, Indonesia

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Seasonal Mean Variability of Coral-based Sea Surface Salinity from Simeulue, Mentawai, Bunaken, and Bali Cahyarini, Sri Yudawati
Indonesian Journal on Geoscience Vol 8, No 3 (2013)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1112.334 KB) | DOI: 10.17014/ijog.v8i3.161

Abstract

DOI: 10.17014/ijog.v8i3.161Sea surface salinity is an important parameter in a climate study. Coral δ18O records δ18O seawater and sea surface temperature (SST). While, coral Sr/Ca records SST only commonly used in a paleoclimate study to reconstruct SST. Thus, paired coral δ18O and Sr/Ca can be used to reconstruct δ18O seawater. δ18O seawater and SSS is linearly correlated, thus reconstructed δ18O seawater further is used to reconstruct sea surface salinity (SSS). Instead of using coral Sr/Ca as SST recorder, paired model (grid) or measured SST data is used to reconstruct SSS. In this study, paired coral δ18O and grid SST data are presented to reconstruct SSS from several different locations across Indonesian sea i.e Simeulue, Mentawai, Bunaken, and Bali. Coral-based SSS reconstructions from those locations are then compared to the grid SSS in the seasonal mean scale. The result shows that annual mean variation of salinity for period of 1958-2008 in Mentawai and Simeulue is 33.25 psu and 33.26 psu respectively, while in Bunaken and Bali is 34.03 psu and 33.47 psu respectively. Correlation coefficient between coral salinity and salinity from model data in the seasonal/monthly mean scale is high i.e R = 0.62 - 0.83. Based on the monthly mean data, corals in the studied area strongly record SSS variation in the monthly or seasonal mean scale. In Mentawai and Simeulue waters, SSS variation is influenced strongly by monsoon. While, in addition to the monsoon, ocean advection also affects seasonal variability of SSS in the Bunaken and Bali waters.
Sea Surface Temperature Reconstruction Period 1993 - 2007 Based on Content Analysis of Coral Sr/Ca from the Region Labuan Bajo, Simeulue Island Cahyarini, Sri Yudawati
Indonesian Journal on Geoscience Vol 6, No 3 (2011)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1097.396 KB) | DOI: 10.17014/ijog.v6i3.121

Abstract

DOI: 10.17014/ijog.v6i3.121Sea surface temperature (SST) is one of the important parameters for (paleo) climate studies. The long time series of SST data are required to understand more the climate change. Coral geochemical proxy such as Sr/Ca overcomes this problem. Coral can provide long time series of climate data continuously from present till hundreds years ago, even fossil (dead) coral can do it till thousand years ago. In this study, Sr/Ca content of Porites coral within 10 m deep from Labuan Bajo, Simeulue Island was analyzed to reconstruct SST. Coral Sr/Ca shows a strong correlation with local SST in seasonal scale as well as in the annual mean scale. Reconstructed SST data show that the monsoon between 1993 2007 strongly influence the SST variation in the Simeulue region. It supposed that the seasonal variation signal strongly influence local SST than the annual mean signal such as El Nino.
Seasonal variation of δ13C content in Porites coral from Simeulue Island waters for the period of 1993-2007 Cahyarini, Sri Yudawati
Indonesian Journal on Geoscience Vol 1, No 2 (2014)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (725.608 KB) | DOI: 10.17014/ijog.v1i2.179

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DOI: 10.17014/ijog.v1i2.179Variation of δ13C content in coral skeletons shows the influence of metabolic fractionation in aragonite coral. Understanding coral δ13C variation can thus be useful to more understand e.g. past bleaching event which is further useful for coral health and conservation. In this study, δ13C content in Porites coral from Labuhan Bajau, Simeulue Islands was analyzed. To know the correlation between variation of coral δ13C and light intensity, the monthly variation of coral δ13C is compared to solar radiation and cloud cover. The result shows that for the period of 2003 to 2008, coral δ13C shows it is well correlated (r=0.42 p=0.153) with cloud cover variation in annual mean scale. Meanwhile, in seasonal mean variation, coral δ13C is strongly influenced (r=0.85 p<0.0001) by cloud cover with 1 - 2 month time lag. Comparing to the solar radiation (cloud cover), SST influences dominantly the variation of coral δ13C from southern Simeulue Island waters (LB sample) in an annual mean scale than in a seasonal scale. 
SUHU MUKA LAUT DAN PENGARUHNYA TERHADAP PERTUMBUHAN LINIER KORAL KEPULAUAN SERIBU Purnamasari, Ida Ayu; Cahyarini, Sri Yudawati
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 20, No 2 (2010)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (242.936 KB) | DOI: 10.14203/risetgeotam2010.v20.38

Abstract

ABSTRAK Koral menyimpan informasi perubahan lingkungan. Analisis pertumbuhan tahunan koral telah dipakai sebagai salah satu data untuk mengetahui perubahan lingkungan. Dalam studi ini dilakukan penghitungan pertumbuhan linier koral dari wilayah Kepulauan Seribu. Penghitungan pertumbuhan linier digunakan dengan menganalisis densitometry  yaitu luminance dengan software koral XDS. Hasilnya diperoleh data kecepatan pertumbuhan linier dalam urut-urutan waktu yang kemudian dibandingkan dengan data suhu permukaan laut. Hasil dari studi ini menunjukkan koral di wilayah lepas pantai (offshore) pertumbuhan linier tahunannya dipengaruhi oleh suhu lebih besar dibandingkan dengan koral di wilayah laut dekat dataran Jakarta (inshore).
Annual growth band analysis of Porites corals: case study Seribu Islands corals, Indonesia Cahyarini, Sri Yudawati
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 18, No 2 (2008)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (206.857 KB) | DOI: 10.14203/risetgeotam2008.v18.16

Abstract

ABSTRAK Pertumbuhan koral bergantung pada beberapa faktor lingkungan, diantaranya yaitu suhu muka laut, salinitas, sedimentasi dan cahaya. Pada tulisan ini dibahas mengenai analisa parameter pertumbuhan tahunan koral (yaitu kecepatan kalsifikasi, densitas dan pertumbuhan linear) dari koral-koral yang diambil di wilayah Kepulauan Seribu. Hasil analisa beberapa parameter dari beberapa lokasi pengambilan koral di Kepulauan Seribu (yaitu Bidadari, Air dan Jukung) tersebut kemudian dibandingkan untuk lebih mengetahui pengaruh perubahan lingkungan di wilayah daratan terhadap koral di perairan terumbu koral Kepulauan Seribu. Metode Coral XDS digunakan untuk analisa parameter pertumbuhan tahunan koral. Hasil yang diperoleh menunjukkan bahwa koral dari Jukung (offshore) memperlihatkan kenaikan kecepatan kalsifikasi, sedangkan koral dari Air dan Bidadari menunjukkan penurunan kecepatan kalsifikasi selama periode 1985-2005. Walau begitu, penyebab penurunan atau kenaikan kecepatan kalsifikasi tersebut masih perlu diteliti lebih lanjut, terutama diperlukan kalibrasi antara parameter pertumbuhan tahunan koral dengan kondisi lingkungan (suhu, salinitas, sedimentasi dll) dimana koral tersebut diambil. Hal tersebut memerlukan monitoring dalam waktu yang lama.
EVALUATION OF THE USE OF FAAS FOR SR/CA CONCENTRATION ANALYSIS OF PORITES FROM AMBON BAY AND JUKUNG ISLAND CORAL Ikhsani, Idha Yulia; Dida, Eki Naidania; Cahyarini, Sri Yudawati
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 9 No. 1 (2017): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (431.49 KB) | DOI: 10.29244/jitkt.v9i1.17939

Abstract

The ratio of Sr/Ca concentration in coral is usually used as paleothermometer. Inductively Coupled Plasma (ICP) is an instrument, which is often used to analyze Sr/Ca concentration in Porites sp. The method is very sensitive and requires small amount of sample. However, the availability of this instrument is very limited. To deal with it, Flame Atomic Adsorption Spectrophotometer (FAAS) is an alternative in order to analyze the concentration of various elements include Sr and Ca. The aim of this study was to evaluate the result of the analysis methods of strontium and calcium concentration in coral using FAAS and compared to ICP results. Sample of Porites coral was taken from Ambon Bay and Jukung Island. The strontium and calcium concentration were analyzed using Flame Atomic Adsorption Spectrophotometer (FAAS). The results showed that the average of ratio Sr/Ca in coral from Ambon Bay and Jukung Island were 8.71 and 7.708 mmol/mol. The monthly variation of  ratio Sr/Ca in coral from Ambon Bay were 6.28 - 10.24 mmol/mol, while in coral from Jukung Island were  1.005 - 10.914 mmol/mol. Result of  FAAS analysis was too broad in range compared to ICP, ie 8.462 - 8.807 dan 8.45 – 8.7 mmol/mol. The range was estimated due to the occurrence of strontium and calcium ionization reaction in flame of FAAS. Keywords: FAAS, coral, ratio Sr/Ca
Growth Rates Analysis of Porites Corals from Nusa Penida, Bali Tito, Camellia Kusuma; Setiawan, Agus; Cahyarini, Sri Yudawati; Indriyawan, Muji Wasis
Journal of Mathematical and Fundamental Sciences Vol 48, No 1 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (650.589 KB) | DOI: 10.5614/j.math.fund.sci.2016.48.1.2

Abstract

The annual growth of Porites coral is represented by a pair of high- and low-density bands. Environmental changes in the ambient waters influence the pattern of these annual density bands. Five colonies of Porites corals from Nusa Penida, Bali were investigated to analyze their annual linear growth rates using coral densitometry. From the analysis it was found that the annual linear growth rates of the colonies varied between 0.8924 to 1.0012 cm/yr. The trends of the colonies growth rates also varied. Two colonies showed a decreasing trend, while the others showed an increasing trend. The annual linear growth rates of most of the colonies were notinfluenced by sea surface temperature (SST); only one out of five colonies had a significant correlation with SST (R = 0.66, p-value < 0.05).
VARIASI TAHUNAN KECEPATAN KALSIFIKASI KORAL PORITES BERDASARKAN ANALISIS COMPUTED-TOMOGRAPHY SCAN (CT –SCAN) DAN KAITANNYA DENGAN SUHU PERMUKAAN LAUT: WILAYAH STUDI PERAIRAN BIAK, PAPUA Cahyarini, Sri Yudawati; Suharsono, Suharsono
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 24, No 2 (2014)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2036.368 KB) | DOI: 10.14203/risetgeotam2014.v24.135

Abstract

Deposition of calcium carbonat (CaCO3) in coral skeleton is known as calcification. The calcification rate is the product of the linear extension rate and the average density at which skeleton was deposited in making that extension. Calcification rate is influenced by the ambient water condition e.g sea surface temperature. To understand the influence of SST to the coral growth, it is required long time series data of both SST and coral growth i.e coral calcification from present time till back tens to hundreds years ago. The aim of this study is to determine the influence of historical SST to coral calcification of Porites coral from Biak waters.  In this study, computer tomography approach is used to analyzed coral calcification. Osirix software is used to analyze the coral image data which is resulted from the computed tomography scanning (CT-Scan). Four coral cores from Biak waters were analyzed for their calcification rate. The results shows that the averaged of calcification rate of four cores increases, which is coincided with increasing of Biak SST during period of 1905-2011. ABSTRAKKemampuan koral mengendapkan kalsium karbonat (CaCO3) dikenal sebagai kalsifikasi. Kecepatan kalsifikasi  merupakan perkalian densitas dan pertumbuhan linear koral tersebut. Kecepatan kalsifikasi koral dipengaruhi oleh kondisi perairan terumbu karang salah satunya adalah suhu permukaan laut (SPL). Untuk memahami bagaimana pengaruh SPL terhadap kalsifikasi koral diperlukan data historis (data urut-urutan waktu) SPL dan kalsifikasi koral dari masa kini sampai masa lalu. Tujuan utama dari studi ini adalah untuk mengetahui sejarah pengaruh SPL terhadap pertumbuhan koral yaitu kalsifikasi dari koral Porites perairan Biak. Dalam studi ini dihitung kecepatan kalsifikasi dengan menggunakan pendekatan tomografi koral dengan menggunakan perangkat lunak Osirix. Hasil scanning computer tomografi (CT-Scan) koral merupakan data inputing Osirix. Empat contoh koral dari perairan Biak dilakukan analisis kecepatan kalsifikasi.  Hasil rata-rata kecepatan kalsifikasi dari ke empat contoh koral Porites Biak menunjukkan kenaikan kecepatan kalsifikasi koral yang selaras dengan kenaikan SPL selama periode 1905-2011. 
Pertambahan penduduk, variasi interannual suhu permukaan laut dan pengaruhnya terhadap pertumbuhan linier karang Porites di Kepulauan Seribu Cahyarini, Sri Yudawati
Jurnal Lingkungan dan Bencana Geologi Vol 2, No 1 (2011)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (864.459 KB) | DOI: 10.34126/jlbg.v2i1.15

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SARIKerusakan lingkungan laut di pesisir Jakarta semakin parah. Data historis perubahan lingkungan laut dalam waktu yang panjang diperlukan untuk memahami intensitas dan sumber kerusakan. Pertumbuhan tahunan karang Porites terbukti akurat sebagai arsip perubahan lingkungan, mampu menyediakan data perubahan lingkungan dalam skala waktu yang panjang. Dengan penelitian karang yang dilakukan di perairan wilayah Kepulauan Seribu, yaitu Pulau Jukung, Pulau Air, dan Pulau Bidadari, faktor perubahan lingkungan di perairan tersebut dapat didokumentasikan dari waktu ke waktu dan penyebab kerusakan lingkungan di wilayah itu dapat lebih dipahami. Pertumbuhan linier karang dari wilayah dekat daratan ke laut lepas dikorelasikan dengan perubahan suhu permukaan laut (SPL) dan pertambahan penduduk DKI Jakarta. Hasil penelitian menunjukkan pertumbuhan linier karang di lokasi penelitian, yaitu di Pulau Jukung, Pulau Air, dan Pulau Bidadari berkorelasi dengan kenaikan jumlah penduduk DKI dalam kurun waktu 1971-2005. Variasi SPL dalam skala interannual memiliki korelasi yang tinggi dengan pertumbuhan linier karang Pulau Jukung yang terletak di lepas pantai, dibandingkan dengan karang Pulau Air dan Pulau Bidadari yang terletak lebih dekat dengan daratan (inshore).Kata kunci: karang, pertumbuhan linier, suhu permukaan laut, pertambahan pendudukABSTRACTThe damage of the marine environment around the coastal region of Jakarta is getting worse. Historical data of marine environmental change within a long period of time is required to understand the intensity and the source of the damage. Annual growth of Porites coral proved accurately as an archive of environmental change which is able to provide data to environmental changes within a long period of time. With corals research conducted in Thousand Islands (Kepulauan Seribu) region namely: Pulau Jukung, Pulau Air, and Pulau Bidadari, the factor of environmental change in this region can be documented from time to time, moreover the cause of the damage of the environment can better be understood. Linear growth of corals in offshore region towards the inshore (high seas) region was correlated with the changes of the surface temperature (SST) and the increase of the population of DKI Jakarta. To study the influence  of anthropogenic factor the data of the linear growth of the corals was correlated to the population of DKI Jakarta. The results showed a linear growth of corals in the study areas (in Jukung Island, Air Island and Bidadari Island) correlated with the increase in total population of Jakarta within the period of 1971-2005. The variation of SST in interannual scale has a tight correlation with the linear growth of the corals of the Jukung Island which is located in offshore area compared with the Bidadari and Air Islands corals those are located closer to inshore (near the coast).Keywords: coral, linier extension, sea surface temperature, population growth
VARIASI KANDUNGAN Pb DALAM KARANG PORITES KEPULAUAN SERIBU SELAMA PERIODE 1994-2005: PERUBAHAN TEMPORAL KANDUNGAN Pb DALAM AIR LAUT PERMUKAAN Cahyarini, Sri Yudawati
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 26, No 2 (2016)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (309.573 KB) | DOI: 10.14203/risetgeotam2016.v26.259

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Lead is one of the most contaminant for the environment, which is resulted from aerosol, industry, automobile exhaust etc. Predominant source of emission is identified to be leaded gasoline. Detail historical and trend of lead content in the environment is necessary to describe, in order to monitor the quality of environment. This requires long time series lead data. Coral can provide this data through analyzing the lead content in its skeleton. This study aims to analyze the lead content in coral skeleton from different sites i.e. Bidadari and Jukung island, the Seribu islands reef complex. Lead content in the inshore (Bidadari island) and offshore (Jukung island) corals are compared. The result shows that variation of Pb content in the inshore coral from Bidadari island is stronger correlated with the river discharge variation than lead variation from the offshore P. Jukung coral. This represent that the anthropogenic lead from the main land of Jakarta and surrounding area influences the inshore coral than the offshore coral. Timbal merupakan salah satu jenis polutan yang dapat dihasilkan karena emisi kendaraan bermotor, pabrik dan lain sebagainya. Bahan bakar kendaraan bermotor bensin (gasoline) teridentifikasi sebagai sumber dominan dari kandungan Pb di lingkungan. Untuk mengetahui kualitas lingkungan terhadap polutan timbal ini diperlukan data historis dari waktu ke waktu kandungan timbal baik di udara maupun di perairan. Karang mampu memberikan informasi historis kandungan Pb di perairan laut. Tujuan penelitian ini untuk menganalisis kandungan Pb dalam karang yang diambil dari beberapa lokadi di Kepulauan Seribu. Hasil yang diperoleh menunjukkan bahwa besaran debit sungai permukaan yang masuk ke wilayah perairan teluk Jakarta berpengaruh kuat terhadap kandungan Pb karang di perairan dalam (inshore) yaitu karang di Pulau Bidadari dibandingkan dengan karang yang dari wilayah laut terbuka (offshore) yaitu Pulau Jukung. Hal ini menggambarkan bahwa polutan Pb dari darat lebih kuat  mempengaruhi kondisi perairan inshore dibandingkan offshore.