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| HASHEMI,SEYED A.. |
| ABSTRACT During the recent decades, deciduous forests have been molested by human intervention. Easy access, abundance and diversity of valuable forest products have led to increased population density, creating new residential areas and deforestation activities. Revealing changes is one of the fundamental methods in management and assessment of natural resources. This study is evaluated changes in forests area of 2013 using satellite images. In order to mapping the forest extent condition 2013, images of the mentioned years were digitized and geo-referenced by using the ground control points and the maps of mapping organization. After selecting the best set of band using the Bhattacharya distance index, the image classification was performed by using... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Satellite data; ETM+; Forest area; Classification. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602357 |
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| Costa Da Silva, Alex; Chaigneau, Alexis; Dossa, Alina N.; Eldin, Gerard; Araujo, Moacyr; Bertrand, Arnaud. |
| Using current, hydrographic and satellite observations collected off Northeast Brazil around the Fernando de Noronha Archipelago and Rocas Atoll during two oceanographic cruises (spring 2015 and fall 2017), we investigated the general oceanic circulation and its modifications induced by the islands. In spring 2015, the area was characterized by lower SST (26.6°C) and deep mixed-layer (∼90 m). At this depth, a strong current shear was observed between the central branch of the eastward flowing near-surface South Equatorial Current and the westward flowing South Equatorial Undercurrent. In contrast, in fall 2017, SST was higher (∼28.8°C) and the mixed-layer shallower (∼50 m). The shear between the central South Equatorial Current and the South Equatorial... |
| Tipo: Text |
Palavras-chave: Mesoscale activity; Satellite data; Western tropical Atlantic; Shipboard measurements; Island wake; Central South Equatorial Current; South Equatorial Undercurrent. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00691/80290/83399.pdf |
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| De Boer, Agatha M.; Graham, Robert M.; Thomas, Matthew; Kohfeld, Karen E.. |
| In recent years the latitudinal position of the Subtropical Front (STF) has emerged as a key parameter in the global climate. A poleward positioned front is thought to allow a greater salt flux from the Indian to the Atlantic Ocean and so drive a stronger Atlantic Meridional Overturning Circulation. Here the common view that the STF aligns with the zero wind stress curl (WSC) is challenged. Based on the STF climatologies of Orsi et al. (1995), Belkin and Gordon (1996), Graham and De Boer (2013), and on satellite scatterometry winds, we find that the zero WSC contour lies on average approximate to 10 degrees, approximate to 8 degrees, and approximate to 5 degrees poleward of the front for the three climatologies, respectively. The circulation in the region... |
| Tipo: Text |
Palavras-chave: Subtropical Front; Wind stress curl; Southern Ocean; Satellite data; Fronts; Dynamical Subtropical Front. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00169/28046/26248.pdf |
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