scholarly journals SEBARAN SPL KAITANNYA DENGAN HASIL TANGKAPAN IKAN CAKALANG (KATSUWONUS PELAMIS) DI PERAIRAN ACEH

1970 ◽  
Vol 10 (1) ◽  
pp. 11-22
Author(s):  
M. Habib EY ◽  
. Nofrizal ◽  
Mubarak .
Keyword(s):  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Satellite Image ◽  
Economic Value ◽  
Sea Surface ◽  
Fishing Ground ◽  
Survey Method ◽  
Optimum Temperature ◽  
Katsuwonus Pelamis ◽  
East West

ABSTRACTSkipjack (Katsuwonus pelamis) has high economic value and many catched in Aceh waters. This study aims to calculate the catch of skipjack, compare the Sea-Surface Temperature (SST) on satellite image with real sea-surface temperature, and determine the effect of sea-surface temperature for the skipjack catch in Aceh waters. This study used data of skipjack catch, sea-surface temperatureon satellite image and real sea-surface temperature (on field) that was conducted in September 2017, using survey method in 32 points of fishing ground with 3 trips. Average of sea-surface temperature was around 27.24 oC, while the sea-surface temperature in Aqua MODIS images was around 28.21 oC in the transition of east-west season. There was differences in real sea-surface temperature and image sea-surface temperature of satellite, but it is not significant. Total catch of skipjack fish in September 2017 was 51,409 kg, and average of CPUE was 1,658 kg/setting. The highest catch of skipjack was 13,280 kg with sea-surface temperature at 27,4 oC because that temperature is the optimum temperature for skipjack. Temperature is affects to the skipjack distribution.Keywords: Katsuwonus pelamis, MODIS, SSTABSTRAKIkan cakalang (Katsuwonus pelamis) merupakan salah satu jenis ikan yang mempunyai nilai ekonomis tinggi, dan banyak tertangkap di Perairan Aceh. Penelitian ini bertujuan untuk menghitung hasil tangkapan ikan cakalang, membandingkan antara SPL citra dan SPL di lapangan,  dan untuk mengetahui pengaruh SPL terhadap hasil tangkapan ikan cakalang di Perairan Aceh, dengan menggunakan data hasil tangkapan ikan cakalang, SPL citra dan SPL lapangan. Penelitian dilakukan pada bulan September 2017. Metode yang digunakan adalah metode survei dengan 32 titik stasiun lokasi penangkapan dengan melakukan 3 trip pelayaran dengan rata-rata SPL lapangan sekitar 27,24 oC. Adapun SPL pada citra Aqua MODIS sekitar 28,21 oC pada musim peralihan timur – barat. Walaupun terdapat perbedaan SPL lapangan dan citra tetapi tidak terlalu signifikan. Total hasil tangkapan ikan cakalang pada bulan September 2017 sebanyak 51,409 kg, dengan rata-rata CPUE 1,658 kg/setting. Hasil tangkapan ikan cakalang paling banyak tertangkap pada suhu 27,4 0C sebanyak 13.280 kg. Hal ini disebabkan pada suhu tersebut merupakan suhu optimum ikan cakalang karena suhu mempengaruhi distribusi penyebaran ikan.Kata kunci: Katsuwonus pelamis, MODIS, SPL

scholarly journals Mapping of Sea Surface Temperature Distribution, Sibolga City, North Sumatera Province using NOAA/AVHRR Satellite

2021 ◽  
Vol 9 (1) ◽  
pp. 1
Author(s):  
Ogesnain Sinaga ◽  
Mubarak Mubarak ◽  
Elizal Elizal
Keyword(s):  
Temperature Distribution ◽  
Global Change ◽  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Satellite Image ◽  
Sea Surface ◽  
Survey Method ◽  
Surface Temperature Distribution ◽  
Noaa Avhrr

The research was aimed to map the sea surface temperature (SST) distribution in Sibolga waters that based on 20 years satellite image of NOAA/AVHRR. It used survey method for ground check in the field to collect in situ SST and other seawater parameters such as its visibillity, pH, and salinity. It found that the SST changes on each 5 year’s calculations with different pattern of distribution; the figures of SST ranged between 28.5-30  oC, 30.5-31  oC, 27-29  oC, and 27.5-28.5 oC. In addition, the pH of seawater ranged from 6-7 and 27-30 ppt in average. Different pattern of SST distribution might be related to global change on temperature and season over 20 years of study.

scholarly journals ANALISIS HUBUNGAN SUHU PERMUKAAN LAUT DAN KLOROFIL-A CITRA SATELIT SUOMI NPP VIIRS TERHADAP HASIL TANGKAPAN PURSE SEINE DI PPN PENGAMBENGAN, BALI (Analysis of the Relationship of Sea Surface Temperature and Chlorophyll-a The Suomi NPP VIIRS Satellite Image Against the Catch of the Seine Purse in PPN Pengambengan, Bali)

2019 ◽  
Vol 14 (2) ◽  
pp. 128
Author(s):  
Muhammad Zahrul Ghufron ◽  
Imam Triarso ◽  
Kunarso Kunarso
Keyword(s):  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Chlorophyll A ◽  
Satellite Image ◽  
Sea Surface ◽  
Purse Seine ◽  
Fishing Ground ◽  
Fishing Vessels ◽  
Euthynnus Affinis ◽  
The Relationship

Perikanan Tongkol (Euthynnus affinis) di Perairan Selat Bali  berkembang pesat sejak diperkenalkannya alat tangkap  Purse seine, hal tersebut menyebabkan semakin meningkatnya jumlah armada kapal penangkap ikan. Meskipun upaya penangkapan meningkat, akan tetapi hasil tangkapan yang didapatkan menurun. Untuk tujuan tersebut diperlukan kajian yang mendalam tentang pola sebaran suhu permukaan laut dan klorofil-a, agar ke depan dapat diketahui daerah penangkapan ikan Tongkol. Penelitian ini mengkaji perbedaan nilai persebaran SPL dan klorofil-a yang secara nyata di lapangan dengan data hasil interpretasi citra satelit Suomi NPP VIIRS, serta mengetahui hubungan distribusi SPL dan klorofil-a terhadap hasil tangkapan ikan Tongkol (Euthynnus affinis). Metode yang digunakan dalam penelitian ini adalah metode deskriptif. Hasil yang didapatkan pada penelitian ini adalah, tingkat akurasi citra satelit Suomi NPP VIIRS pada variabel suhu permukaan laut mencapai 98,98%, sementara untuk tingkat akurasi terhadap konsentrasi klorofil-a mencapai 95,63%. Hubungan suhu permukaan laut dan klorofil-a terhadap CPUE yaitu menunjukan pengaruh yang cukup kuat dengan nilai sebesar 0,585. Nilai r2 menunjukan nilai sebesar 34,3%, yang berarti bahwa sebesar 34,3% CPUE dipengaruhi oleh suhu permukaan laut dan klorofil-a, sedangkan 65,7% dipengaruhi oleh faktor-faktor lain Eastern Little Tuna (Euthynnus affinis) in the Waters of Bali Strait has been growing rapidly since the introduction of purse seine fishing gear, this has led to an increasing number of fishing vessels. Although the fishing effort increases, the catch obtained decreases. For this purpose an in depth study of the distribution patterns of sea surface temperature and chlorophyll-a is needed, so that in the future it can be known the fishing ground to assist in the effective and efficient utilization of fish resources. This study examines the differences in the value of the distribution of sea surface temperature and chlorophyll-a that are evident in the field with data from interpretation of Somi NPP VIIRS satellite images, and knowing the relationship between the distribution of sea surface temperature and chlorophyll-a to the Eastern Little Tuna catches. The method used in this research is descriptive method. The results obtained in this study are, the accuracy of the Suomi NPP VIIRS satellite image on the variable sea surface temperature reaches 98.98%, while the level of accuracy of the chlorophyll-a concentration reached 95.63%, the relationship between sea surface temperature and chlorophyll-a on CPUE is a fairly strong correlation, with a correlation value of 0,585. The value of r2 means that 34.3% CPUE is influenced by sea surface temperature and chlorophyll-a, while 65.7% is influenced by other factors..

scholarly journals POTENTIAL AREA ESTIMATION OF FISHING GROUND BASED ON THERMAL FRONT AND UPWELLING IN WEST SUMATERA WATERS IN EAST SEASON

2020 ◽  
Vol 3 (3) ◽  
pp. 217-224
Author(s):  
Ahmad Vikri ◽  
Sofyan Husein Siregar ◽  
Mubarak
Keyword(s):  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Sea Surface ◽  
Fishing Ground ◽  
Survey Method ◽  
Thermal Front ◽  
Area Estimation ◽  
Modis Image ◽  
West Sumatra ◽  
Potential Area

This research was conducted in August to November 2019. It aims to determine the potential fishing ground based on thermal front and upwelling in the waters of West Sumatra. The survey method was applied in this research. The results showed that the distribution of thermal front and upwelling in the waters of West Sumatra experienced a change that was not too significant. Based on the results of sea surface temperature verification on the Aqua MODIS image with the temperature in the field obtained temperature differences of around ± 10C. The catch during the research shows that catches in the thermal front area can be used as a potential fishing ground because the catch in the thermal front area is more than the area outside the thermal front

What Controls the Mean East–West Sea Surface Temperature Gradient in the Equatorial Pacific: The Role of Cloud Albedo

2014 ◽  
Vol 27 (7) ◽  
pp. 2757-2778 ◽  
Author(s):  
N. J. Burls ◽  
A. V. Fedorov
Keyword(s):  
Temperature Gradient ◽  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Walker Circulation ◽  
Equatorial Pacific ◽  
Sea Surface ◽  
Sea Surface Temperature Gradient ◽  
The Mean ◽  
East West ◽  
Surface Temperature Gradient

Abstract The mean east–west sea surface temperature gradient along the equator is a key feature of tropical climate. Tightly coupled to the atmospheric Walker circulation and the oceanic east–west thermocline tilt, it effectively defines tropical climate conditions. In the Pacific, its presence permits the El Niño–Southern Oscillation phenomenon. What determines this temperature gradient within the fully coupled ocean–atmosphere system is therefore a central question in climate dynamics, critical for understanding past and future climates. Using a comprehensive coupled model [Community Earth System Model (CESM)], the authors demonstrate how the meridional gradient in cloud albedo between the tropics and midlatitudes (Δα) sets the mean east–west sea surface temperature gradient in the equatorial Pacific. To change Δα in the numerical experiments, the authors change the optical properties of clouds by modifying the atmospheric water path, but only in the shortwave radiation scheme of the model. When Δα is varied from approximately −0.15 to 0.1, the east–west SST contrast in the equatorial Pacific reduces from 7.5°C to less than 1°C and the Walker circulation nearly collapses. These experiments reveal a near-linear dependence between Δα and the zonal temperature gradient, which generally agrees with results from the Coupled Model Intercomparison Project phase 5 (CMIP5) preindustrial control simulations. The authors explain the close relation between the two variables using an energy balance model incorporating the essential dynamics of the warm pool, cold tongue, and Walker circulation complex.

scholarly journals Chlorophyll-a variability during positive IOD - the east season period in 2019 in Padang Sea, Indonesia

2020 ◽  
Vol 200 ◽  
pp. 06002
Author(s):  
Dandi Arianto Pelly ◽  
Muh Aris Marfai ◽  
Evita Hanie Pangaribowo ◽  
Akhmad Fadholi
Keyword(s):  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Chlorophyll A ◽  
Satellite Image ◽  
Temporal Distribution ◽  
Image Data ◽  
Sea Surface ◽  
Chlorophyll A Concentration ◽  
Positive Indian Ocean Dipole ◽  
Point Data

This study aimed to identify the effect of the positive Indian Ocean Dipole (IOD) phenomenon on the spatial, temporal distribution of chlorophyll-a concentrations in the East Season in Padang Sea in 2019. The method used in this research was the Kriging analysis method applied in oceanographic parameter satellite imagery extraction point data. By applying the method, we produced the maps of the spatial distribution variation of chlorophyll-a content and Sea Surface Temperature (SST). The data of IOD events in 2019 showed the occurrence of a strong positive IOD phenomenon that caused anomaly in the Sea Surface Temperature (SST) in Padang Sea. The interpretation of Aqua-Modis level 2 satellite image data showed that the sea surface temperature during the East Season was relatively cold, which was in the minimum temperature ranging from 18.5-22°C with a normal temperature condition of 28-29°C. The minimum chlorophyll-a concentration in the East Season was 0.252 mg/m3; while the maximum value reached 18.5 mg/m3. The distribution value of chlorophyll-a concentration was 1.028 mg/m3.The RMSe Cross Validation value obtained was 0.504 for SST and 0.363 for chlorophyll-a with a mean SST of -0.0005 and mean chlorophyll-a of -0.0039.

scholarly journals SEBARAN SUHU PERMUKAAN LAUT (SPL) SECARA SPASIAL DAN TEMPORAL DI PERAIRAN SELAT ALAS PROVINSI NUSA TENGGARA BARAT

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Didik Santoso
Keyword(s):  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Satellite Image ◽  
Temporal Distribution ◽  
Secondary Data ◽  
Sea Surface ◽  
Primary Data ◽  
Average Temperature ◽  
Level 3 ◽  
Research Period

Abstrak: Tujuan dari penelitian ini adalah unutk Menentukan sebaran suhu permukaan laut (SPL) secara spasial dan temporal  di Selat Alas Provinsi NTB. Lokasi penelitian di wilayah perairan Selat Alas. Waktu penelitian selama 5 bulan yaitu dari bulan Agustus-Desember 2015. Data penelitian berupa data primer SPL Selat Alas dan data sekunder berupa data citra satelit Aqua MODIS Level-3 dengan resolusi spasial 0,05o x 0,05o dan resolusi temporal 8 harian sebagai data bulanan yang cakupan waktunya dari Agustus 2008 sampai dengan Desember 2012. Data dianalisis dengan menggunakan algoritma Miami Pathfinder SST (MPFSST). Hasil penelitian menunjukkan bahwa secara spasial sebaran SPL Selat Alas didominasi oleh suhu rendah terutama yang berlokasi di bagian selatan, dan bagian tengah selat dengan suhu rata-rata sebesar 26.50C. Sedangkan secara temporal sebaran SPL wilayah perairan Selat Alas menunjukkan bahwa penurunan SPL terjadi disetiap bulan Agustus dan mulai meningkat pada bulan berikutnya, hingga mencapai suhu tertinggi pada bulan Desember, dan hal ini berulang setiap tahunnya. Suhu tinggi mendominasi seluruh bagian selat dengan suhu rata-rata 29.50C pada bulan November dan 29.00C pada bulan Desember. Akan tetapi pada bulan Desember, pada bagian utara selat suhu rata-rata nya  lebih tinggi dari daerah lainnya yaitu sebesar 29.70C.  Kata kunci: Citra Satelit , Selat Alas, Suhu Permukaan Laut, Spasial, Temporal Abstract: The purpose of this study is to determine the spatial and temporal distribution of sea surface temperature (SST) in the Alas Strait of NTB Province. Research location in the Alas Strait waters. The research period  is 5 months, from August to December 2015. The research data are in the form of primary data on the Alas Strait Sea Surface Temperature and secondary data in the form of Aqua satellite image MODIS Level-3, with spatial resolution of 0.05o x 0.05o and 8 daily temporal resolutions, as monthly data from August 2008 to December 2012. Data were analyzed using the Miami Pathfinder SST algorithm (MPFSST). The results of the study indicate that spatially the distribution of Alas Strait Surface Temperature is dominated by low temperatures, especially those located in the south, and the central part of the strait with an average temperature of 26.50C. While temporally the distribution of Sea Surface Temperature in the Alas Strait waters region shows that the decline occurred every August and began to increase the following month, until it reached the highest temperature in December, and this recurs every year. High temperatures dominate the entire strait with an average temperature of 29.50C in November and 29.00C in December. However, in December, in the northern part of the strait the average temperature was higher than other regions, which amounted to 29.70C. Keywords: Satellite Imagery, Alas Strait, Sea Surface Temperature, Spatial, Temporal 

scholarly journals Variability of Sea Water Temperature and Its Implication on Cakalang Fish Capture (Katsuwonus pelamis L) in Manokwari Waters, West Papua

2020 ◽  
Vol 4 (2) ◽  
pp. 129
Author(s):  
Ridwan Sala ◽  
Jafry F. Manuhutu
Keyword(s):  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Sea Water ◽  
Sea Surface ◽  
Katsuwonus Pelamis ◽  
Growth Coefficient ◽  
Field Surveys ◽  
Average Size ◽  
Relationship Of ◽  
The Relationship

The presence of skipjack fish resources in a fishing area is related to the suitability of the environmental conditions of the waters. This study aims to examine the relationship of sea surface temperature (SPL) to skipjack catches and the characteristics of skipjack catches in Manokwari waters. Data, both catch data and sea surface temperature data, are collected through field surveys by following fishing operations. Furthermore, the data were analyzed descriptively using graphs and mathematically like von Bertalanffy's growth model. The results of this study found that the very small variability of SPL could not explain the variation in the volume of fishermen's catches in Manokwari waters. However, a high SST during the May - August 2013 period is thought to affect the size of the skipjack caught, where the average size of the fish caught inhabited areas near sea level. In addition, the growth of skipjack fish in Manokwari waters is relatively fast with a growth coefficient of 0.42 per year1 and natural mortality between 0.79 per year and 0.81 per year.

scholarly journals DINEOF reconstruction for creating long-term cloud-free sea surface temperature data records: A Case study in Lombok Strait, Indonesia

2021 ◽  
Vol 893 (1) ◽  
pp. 012069
Author(s):  
Yochi Okta Andrawina ◽  
Ratu Almira Kismawardhani ◽  
Hasti Amrih Rejeki
Keyword(s):  
Missing Data ◽  
Climate Variability ◽  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Satellite Image ◽  
Empirical Orthogonal Functions ◽  
Sea Surface ◽  
Series Data ◽  
Data Record

Abstract A long-term reliable sea surface temperature (SST) satellite data record is requisite resources for monitoring to understand climate variability. Creating a long-term data record especially for climate variability requires a combination of multiple satellite products. Consequently, missing data issues are inevitable. Hence, DINEOF (Data Interpolating Empirical Orthogonal Functions) has been applied to attain a complete and coherent multi-sensor SST data record with EOF-based technique by reconstructing the missing data. Unfortunately, the technique can lead to large discontinuities in the data reconstruction due to images depiction within long time series data. For that reason, filtering the temporal covariance matrix had been applied to reduce the spurious variability and more realistic reconstructions are obtained. However, this approach has not yet tested in tropical region with higher evaporation which cause incomplete satellite image coverage. Therefore, the objective of this research is to reconstruct SST of Lombok strait with data gaps up to 58.16% in one year. It is successfully reconstructed until the last iteration of 42 optimal EOF modes with the convergence achieved up to 0.9806×10-3, including previous set-aside data for internal cross-validation. The results highlight that the DINEOF method can effectively reconstruct SST data in Lombok Strait.

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