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All Journal IJOG : Indonesian Journal on Geoscience Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Teknologi Indonesia
Sri Yudawati Cahyarini
Geotechnology Research Centre, Indonesian Institute of Sciences Kompleks LIPI, Jl. Sangkuriang, Bandung 40135, Indonesia
Computer Science & IT Earth & Planetary Sciences Education Energy Engineering Environmental Science

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 1 
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

Abstract

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. 
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 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.
REKONSTRUKSI VARIASI BULANAN SALINITAS DI JALUR ARUS LINTAS INDONESIA SELAMA ~ 200 TAHUN: REKAMAN SALINITAS DARI δ18О KARANG BUNAKEN DAN BALI Hernawan, Indra; Cahyarini, Sri Yudawati; Putri, Mutiara
Jurnal Geologi dan Sumberdaya Mineral Vol 22, No 3 (2012): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (490.572 KB)

Abstract

Salinity is one of important parameter in oceanographic studies. The long timeseries oceanographic data is required to more understand the variability of oceanographic condition. Coral geochemical proxies overcome the shortcoming of instrumental data availibility. δ18О contents in coral skeleton is influenced by sea surface temperature and δ18О seawater. δ18О seawater is influenced by salinity. In this study salinity is reconstructed using coral δ18О and SST from the data model. δ18О from Bunaken and Padang Bai (Bali) corals are used in this study. SST data from the ERSST, SODA and HAMSON are used to reconstruct salinity. This study result in that the Bunaken coral records the local salinity variation in monthly and annual mean resolution. Padang Bai coral records better salinity in annual mean variation than in monthly variation. In both region, salinity variation in decadal resolution does not show significantly different.Keywords: Salinity, Sea surface temperature, δ18О, coral, Bunaken and Bali.
VARIASI SUHU MUKA LAUT BULANAN BERDASARKAN KANDUNGAN KIMIA KORAL Cahyarini, Sri Yudawati; Pfeiffer, Miriam; Prayudi, Dudi
Teknologi Indonesia Vol 32, No 2 (2009)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.045 KB) | DOI: 10.14203/jti.v32i2.11

Abstract

Information on environmental changes which is available today is limited to only dozen years back. In order to make an assesment on environmental changes, information on longer time is required. Corals can provide environmental data till thousand years back. To have some information, it is required to analyze geochemical proxy. By analyzing geochemical elements such as Sr/Ca, ?18O, sea surface temperature and salinity can be reconstructed. Further, by analyzing and interpreting time series data of coral geochemical proxy can be used to understand intensity, process, and mechanism of the environmental damage. In this study, reconstruction of sea surface temperature using Sr/Ca and ?18O coral from Timor is used as a case. The result shows that Sr/Ca is influenced by sea surface temperature.
Co-Authors Indra Hernawan, Indra Mutiara Putri, Mutiara Pfeiffer, Miriam Prayudi, Dudi