James P. Panjaitan, James P.
Departemen Ilmu dan Teknologi Kelautan, FPIK-IPB, Bogor.

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VARIATION AND TREND OF SEA LEVEL DERIVED FROM ALTIMETRY SATELLITE AND TIDE GAUGE IN CILACAP AND BENOA COASTAL AREAS

International Journal of Remote Sensing and Earth Sciences (IJReSES) Vol 13, No 1 (2016)
Publisher : National Institute of Aeronautics and Space of Indonesia (LAPAN)

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Abstract

Observation of sea levels continuously is very important in order to adapt the disasters in the coastal areas. Conventionally observations of sea level using tide gauge, but the number of tide gauge installed along the coast of Indonesia is still limited. Altimetry satellite data is one solution; therefore it is necessary to assess the potential and accuracy of altimetry satellite data to complement the sea level data from tide gauges. The study was conducted in the coastal waters of Cilacap and Bali by analysis data Envisat satellite altimetry for period 2003 to 2010 and data compiled from a variety of satellite altimetry from 2006 to 2014. Data tidal was used as a comparison of altimetry satellite data. The altimetry satellite data in Cilacap and Benoa waters more than 90% could be used to assess the variation and the sea level rise during the period 2003-2010. The rate of sea level rise both the data of tidal and satellite altimetry data indicates the same rate was 3.5 mm/year in Cilacap. in Benoa are 4.7 mm/year and 5.60 mm/year respectively.

ACCURACY IMPROVEMENT ON SEA SURFACE HEIGHT ESTIMATION BASED ON WAVEFORM RETRACKING ANALYSES OF JASON-2 SATELLITE IN JAVA SEA

Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 7, No 2 (2015): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Jurnal Ilmu dan Teknologi Kelautan Tropis

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Abstract

A waveform created by the reflected signal from altimeter satellite in offshore is generally in ideal shape (Brown-waveform) and produces an accurate sea surface height (SSH) estimation. However, over coastal waters, the waveform shape becomes complex due to a disruption by reflected signal from land, resulting inaccurate SSH estimation. The objective of this research was to improve the accuracy of SSH estimation employing waveform retracking analyses of Jason-2 altimeter satellite data in the Java Sea during the years of 2012-2014. This study used data from the Sensor Geophysical Data Record type D (SGDR-D) from Jason-2 satellite (cycle 129 - 239) and global geoid undulation data of Earth Gravitational Model 2008 (EGM08). Waveform retracking analyses were conducted using several retracker methods. The performance of the all retrackers were examined using a world reference undulation geoid of EGM08. The results showed that the waveform retracking analyses were able to improve the accuracy of SSH estimation approximately 29.7% in the north coast and 56.4% in the south coast of total non-Brown-waveform in each region. Higher improvement percentage (IMP) of SSH estimation found in the southern coastal areas was due to a relatively smooth coastline formation in this region than in northern coastal region. There was no specific retracker that produce dominant IMP of SSH estimation. However, the  threshold 10% retracker produced better SSH estimation than the other retrackers with dominant IMP values of 57.1% (pass 051), 48.1% (pass 064), and 25.7% (pass 127). OCOG retracker the worst retracker to estimate SSH in the Java Sea.                                                                                                               Keywords: EGM08, waveform retracking, SSH, Jason-2, ocean retracker, threshold retracker

SEBARAN PRODUKTIVITAS PRIMER KAITANNYA DENGAN KONDISI KUALITAS AIR DI PERAIRAN KARIMUN JAWA

Jurnal Segara Vol 15, No 1 (2019): April
Publisher : Pusat Riset Kelautan

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Abstract

Kepulauan Karimun Jawa merupakan gugusan pulau-pulau yang memiliki sumberdaya pesisir yang besar. Sumberdaya pesisir di Karimun Jawa didukung dengan adanya ekosistem penting seperti ekossistem karang, lamun, rumput laut dan mangrove. Meningkatnya pariwisita di perairan Karimun Jawa dapat mengakibatkan kerusakan ekosistem dan berdampak menurunnya kesuburan perairan di sekitar laut. Hal tersebut berdampak pada organisme yang terdapat pada perairan tersebut. Klorofil-a merupakan pigmen fitoplankton yang berperan penting dalam proses fotosintesis. Proses fotosintesis juga dipengaruhi oleh sinar cahaya yang masuk di dalam perairan sehingga apabila kekeruhan di suatu perairan tinggi dapat menyebabkan berkurangnya penetrasi cahaya yang masuk ke dalam perairan.  Penelitian ini bertujuan untuk menganalisis produktivitas primer kaitannya dengan parameter lingkungan yang berpengaruh terhadap produktivitas perairan. Metode yang digunakan dalam penelitian ini adalah menggunakan analisis komponen utama (PCA). Uji laboratorium yang dilakukan adalah analisis konsentrasi klorofil-a dan muatan padatan tersuspensi. Hasil dari penelitian ini yaitu nilai produktivitas primer berkisar antara 37.5 – 75 mgC/m3/jam. Hasil analisis PCA menunjukkan bahwa indikator yang dominan  dalam produktivitas primer adalah nilai klorofil-a dan muatan padatan tersuspensi