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Journal : International Journal of Remote Sensing and Earth Sciences (IJReSES)

TREND IN PRECIPITATION OVER SUMATERA UNDER THE WARMING EARTH Iskandar, Iskhaq; Irfan, Muhammad; Syamsuddin, Fadli; Johan, Akmal; Poerwono, Pradanto
International Journal of Remote Sensing and Earth Sciences (IJReSES) Vol 8, (2011)
Publisher : National Institute of Aeronautics and Space of Indonesia (LAPAN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (737.415 KB) | DOI: 10.30536/j.ijreses.2011.v8.a1737

Abstract

A long-term climate variations in the western Indonesian region (e.g. Sumatera) were evaluated using precipitation data as a proxy. The result showed that there was a long-term climate variation over Sumatera region indicated by a decreasing trend in precipitation (drying trend). Moreover, the long-term precipitation trend has a strong seasonality. Remarkable decreasing trend at a rate of 3.9 cm/year (the largest trend) was observed during the northwest monsoon (DJF) season, while the smallest decreasing trend of 1.5 cm/year occurred during the southeast monsoon (JJA) season. This result suggested that the Sumatera Island experienced a drying trend during the northwest monsoon season, and a dryer condition will be more frequently observed during the southeast monsoon season. The long-term precipitation over the Sumatera Island was linked to coupled air-sea interactions in the Indian and Pacific oceans. The connection between the seasonal climate trends and sea surface temperature (SST) in the Indian and Pacific oceans was demonstrated by the simultaneous correlations between the climate indices (e.g. Dipole Mode Index (DMI) and the Niño3.4 index) and the precipitation over the Sumatera Island. The results suggested that both the Indian Ocean Dipole (IOD) and the El Niño-Southern Oscillation Index (ENSO) have significant correlation with precipitation. However, remarkable correlations were observed during the fall transition of the IOD event. Keywords: Climate variations, Dry season, Precipitation, Sumatera and Kalimantan, Wet season.
INDENTIFYING PATTERNS OF SATTELITE IMAGERY USING AN ARTIFICIAL NEURAL NETWORK Iskandar, Iskhaq; Affandi, Azhar; Setiabudidaya, Dedi; Irfan, Muhammad; Mardiansyah, Wijaya; Syamsuddin, Fadli
International Journal of Remote Sensing and Earth Sciences (IJReSES) Vol 9, No 1 (2012)
Publisher : National Institute of Aeronautics and Space of Indonesia (LAPAN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (620.1 KB) | DOI: 10.30536/j.ijreses.2012.v9.a1824

Abstract

An artificial neural network analysis based on the self-organizing map (SOM)  was used  to  examine  patterns  of  satellite  imagery.  This  study  used  3  ×  4  SOM  array  to  extract patterns  of  satellite-observed  chlorophyll-a  (chl-a)  along  the  southern  coast  of  the  Lesser Sunda Islands from 1998 to 2006. The analyses indicated two characteristic spatial patterns, namely the northwest and the southeast monsoon patterns. The northwest monsoon pattern was characterized by a low  chl-a concentration. In contrast, the southeast monsoon pattern was  indicated  by  a  high  chl-a  distributed  along  the  southern  coast  of  the  Lesser  Sunda Islands.  Furthermore,  this  study  demonstrated  that  the  seasonal  variations  of  those  two patterns  were  related  to  the  variations  of  winds  and  sea  surface  temperature  (SST).  The winds  were  predominantly  southeasterly  (northwesterly)  during  southeast  (northwest) monsoon, drived  offshore (onshore) Ekman transport and  produced  upwelling (downwelling) along  the  southern  coasts  of  the  Lesser  Sunda  Islands.  Consequently,  upwelling  reduce dSST  and  helped  replenish  the  surface  water  nutrients,  thus  supporting  high  chl-a concentration. Finally, this study demonstrated that the SOM method was very useful for the identifications of patterns in various satellite imageries.
Co-Authors -, Wahyuddin Abdurrachman Baksir, Abdurrachman Abdurrasyid - Akmal Johan, Akmal Ali Imron Ali Imron, Moh Ali Mokhtar Ambri, Saipul Andi Aco Agus, Andi Aco Andri Andri Aniza Aniza, Aniza Aref Vai, Aref Arga Khariyono Arif Pristianto, Arif Aris, Muhammad Arsali Arsali, Arsali Arsyad, Usman Azhar Affandi Bagus Komang Satriyasa Bakhtiar Alldino Ardi Sumbodo Bangga Dirgantara Adiputra, Bangga Dirgantara Bastian Triatmojo, Bastian Budirman Bachtiar Damanik, Suryadi Dedi Setiabudidaya, Dedi Denny Nugroho Sugianto DESAK MADE WIHANDANI Desriyeni, Desriyeni Dewa Putu Sutjana Dewi Libriana Dhofirul Fadhil Dzil Ikrom Al Hazmi Dhofirul Fadhil Dzil Ikrom Al Hazmi Dimas Sondang Irawan Doddy Panentu Dodi Siregar Dwi Setiyawati Enda Wista Sinuraya Erma Suryani Sahabuddin, Erma Suryani Fadli Syamsuddin, Fadli Fera Lusiana, Fera Frinsyah Virgo, Frinsyah Gentur Handoyo Hardi Wibowo Hastuti, Santi Bery Hawis H. Madduppa I Dewa Ayu Inten Dwi Primayanti I Made Muliarta I Made Niko Winaya I Putu Adiartha Griadhi I Putu Gede Adiatmika I Putu Sutha Nurmawan Ika Candradewi, Ika Ilham, Mhd Iskhaq Iskandar Isril " J. Alex Pangkahila Jehanzeb, Sumaira Jemmy Susanti Jufrizel Jufrizel Kaltum, Umi Ketut Tirtayasa Khan, Shaukat Kotta, Raismin Lailis Syafa’ah, Lailis Luh Putu Ratna Sundari, Luh Putu Ratna Machmud Effendy Maman Somantri Mesran Mesran, Mesran Muhammad Fadly Muhammad Marzuqi Abdullah, Muhammad Marzuqi Muhammad Sudirman Muslimin Muslimin Natalia Natalia Nebuchadnezzar Akbar Nia Kurniati Novi Shintia, Novi Nur Azlina Nurcahyani Dewi Retnowati Nurmulyani, Nurmulyani Nuroji Nuroji Nurvi Alvi Sari Nyoman Adiputra Pradanto Poerwono, Pradanto Rahmi Zulhida, Rahmi Renita Juwita Reza Maulana Rizka Grahara Rizki, Cut Zakia Ronny Mantala, Ronny RUMYENI " Rusli Rusli Sinaga, Agustian Sri Adi Widodo Sri Yuliana SUDARYANTO - Sugijanto - Suginam Suginam, Suginam Suharta, Asep Surahman Surahman Susy Purnawati Suwignyo . SYAHRANI SYAHRANI Syam, Masrum Syofia, Irna Tala, Selfin Triandari, Listya Ulah, Irfan Ulfa, Merinda Wa Ode Zusnita Muizu wahyuni wahyuni Waslaluddin Waslaluddin Wayan Weta Wijaya Mardiansyah, Wijaya Yudi Alhadi, Yudi Zainur, Zainur