scholarly journals The Nesla Gorge and the connection of the Sofia Lake with the Pannonian Basin

2020 ◽  
Vol 81 (3) ◽  
pp. 144-146
Author(s):  
Dimitar Sinnyovsky
Keyword(s):  
Sea Level ◽  
Pannonian Basin ◽  
Geological History ◽  
Level Fluctuation ◽  
Climatic Cycles ◽  
History Of ◽  
Sea Level Fluctuation

The Nesla Gorge is a picturesque flat-bottomed gorge carved by the Gaber River through the limestones of the Slivnitsa Formation west of Nesla village, Dragoman area. Its flattened bottom is evidence for an inter-lake strait between the Gaber Basin and the Nishava-Moravian Basin in Serbia. This is proved by several layers in the Novi Iskar Formation containing mollusks typical of the Pannonian Basin. It is supposed that the main reason is the sea-level fluctuation of the Pannonian Sea due to Milankovitch climatic cycles which caused two-way movement of the water between the two basins through the Nesla Gorge. The geological history of the area, as evidenced by the geomorphological data, shows the important role of the Nesla Gorge for the existence of the Gaber Basin and Sofia Lake during the Pontian and Dacian Ages.

scholarly journals ANALISIS PENTARIKHAN RADIOKARBON UNTUK PENENTUAN FLUKTUASI MUKA LAUT DI SEBELAH UTARA PULAU BANGKA

2016 ◽  
Vol 12 (3) ◽  
pp. 135
Author(s):  
Darwin Siregar ◽  
Kresna Tri Dewi
Keyword(s):  
Sea Level ◽  
Radiocarbon Dating ◽  
Local Area ◽  
Level Fluctuation ◽  
14C Dating ◽  
Bottom Part ◽  
Subsurface Sediments ◽  
History Of ◽  
Absolute Dating ◽  
Sea Level Fluctuation

Salah satu metode penentuan umur absolut batuan, fosil, sedimen atau artefak adalah menggunakan pentarikhan radiokarbon (C14) dari material organik. Data umur tersebut dapat berguna untuk menunjang berbagai penelitian terkait dengan sejarah bumi dan kehidupan manusia. Tujuan dari tulisan ini adalah untuk melacak fluktuasi muka laut berdasarkan data umur sedimen bawah dasar laut di sebelah utara Pulau Bangka. Hasil analisis pentarikhan radiokarbon terhadap tiga sampel sedimen menunjukkan dua umur yang berbeda. Sedimen dari bagian bawah (70-80 cm) dibawah dasar laut telah diperoleh umur 15.050± 60 SM dan 15.250 ±850 SM. Rentang waktu ini termasuk dalam segmen 2 pada saat laut naik sedang dari kedalaman -114 ke -96 m dari muka laut saat ini. Sedimen dari bagian atas (30 cm) telah diperoleh umur 6.500 ± 360 SM pada saat muka laut mendekati posisi sekarang. Studi ini memperlihatkan fluktuasi muka laut di wilayah lokal di sekitar Pulau Bangka. Katakunci: pentarikhan karbon, muka laut, Pulau Bangka One method for absolute dating of rocks, fossils, sediments or artefacts is by using radiocarbon dating (14C dating) of organic materials. This age data can be useful for supporting various researches related to the history of earth and human being. The purpose of this paper is to trace the sea level fluctuation based on subsurface sediments from northern part of Bangka Island. The radiocarbon dating from three sediment samples has resulted two different age. Sediments at the bottom part of the core (70-80 cm) below seafloor have been dated at 15.050 ± 60 BP and 15.250± 850 BP. It belongs to segment 2 when sea rose moderately from -114 to-96 m of the present-day sea level. The sediment at the upper part (30 cm) has been dated at 6.500 ± 360 BP when sea level as close as present-day position. This study shows sea level fluctuation in the local area off Bangka Island. Keywords: radiocarbon dating, sea level, Bangka Island

A Near-Uniform Basin-Wide Sea Level Fluctuation of the Mediterranean Sea

2007 ◽  
Vol 37 (2) ◽  
pp. 338-358 ◽  
Author(s):  
Ichiro Fukumori ◽  
Dimitris Menemenlis ◽  
Tong Lee
Keyword(s):  
Atlantic Ocean ◽  
Mediterranean Sea ◽  
Sea Level ◽  
Ocean Circulation ◽  
Large Scale ◽  
Circulation Model ◽  
Level Fluctuation ◽  
Strait Of Gibraltar ◽  
Sea Level Fluctuation ◽  
The Mediterranean

Abstract A new basin-wide oscillation of the Mediterranean Sea is identified and analyzed using sea level observations from the Ocean Topography Experiment (TOPEX)/Poseidon satellite altimeter and a numerical ocean circulation model. More than 50% of the large-scale, nontidal, and non-pressure-driven variance of sea level can be attributed to this oscillation, which is nearly uniform in phase and amplitude across the entire basin. The oscillation has periods ranging from 10 days to several years and has a magnitude as large as 10 cm. The model suggests that the fluctuations are driven by winds at the Strait of Gibraltar and its neighboring region, including the Alboran Sea and a part of the Atlantic Ocean immediately to the west of the strait. Winds in this region force a net mass flux through the Strait of Gibraltar to which the Mediterranean Sea adjusts almost uniformly across its entire basin with depth-independent pressure perturbations. The wind-driven response can be explained in part by wind setup; a near-stationary balance is established between the along-strait wind in this forcing region and the sea level difference between the Mediterranean Sea and the Atlantic Ocean. The amplitude of this basin-wide wind-driven sea level fluctuation is inversely proportional to the setup region’s depth but is insensitive to its width including that of Gibraltar Strait. The wind-driven fluctuation is coherent with atmospheric pressure over the basin and contributes to the apparent deviation of the Mediterranean Sea from an inverse barometer response.

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