This work summarizes recently published information on the solar UV broadband irradiation of Pernambuco, Northeast of Brazil. We describe the spatial and temporal distribution of solar UV radiation and its relationshi...This work summarizes recently published information on the solar UV broadband irradiation of Pernambuco, Northeast of Brazil. We describe the spatial and temporal distribution of solar UV radiation and its relationship with climatic and geographical conditions. Statistical experimental correlation between solar total irradiation and UV broadband obtained for 03 locations was generalized by the use of Koppen-Geiger Climatic criterium, which was used for mapping the spatial/temporal distribution of broadband UV. The climatological solar radiations used in the correlations were obtained by modeling through satellite and previously verified with terrestrial data. We present one map with the location of the recording stations where the statistical correlations were measured, one annual and 12 monthly contour maps describing monthly daily solar UV radiation levels throughout the territory of Pernambuco. The solar UV irradiation (“broadband”) annual-average daily value in the State of Pernambuco varied from 226 to 268 Wh/m<sup>2</sup>. Seasonal variation of solar UV irradiation in the State of Pernambuco follows, in general and as expected, the climate, relief and seasons of the year. The highest value of monthly solar UV irradiation was observed in the central south region of the state, more precisely in Belém do São Francisco, Floresta, Ibimirim and Buíque in the month of December (summer), with 311.8 Wh/m<sup>2</sup>. The lower value was found in the south Agreste region, in Garanhuns and Caruaru, in the month of June (winter), with 162.2 Wh/m<sup>2</sup>.展开更多
In continental shelf areas works where the focus is Geochemistry are widely relevant, due to the vast complexity and uses of these relief features (social, environmental and economic). On the Brazilian Northeast tropi...In continental shelf areas works where the focus is Geochemistry are widely relevant, due to the vast complexity and uses of these relief features (social, environmental and economic). On the Brazilian Northeast tropical shelves, with emphasis on the Pernambuco Continental Shelf (PCS), the published studies are limited and have aimed at portions closer to the coastline. The objective of the present work is the description of the characteristics and origin of sedimentary organic matter (SOM) in the inner and middle Pernambuco shelf, defining and classifying the local geochemical sedimentary facies. The sampling stations (136) were collected in the study area, and the grain-size, contents of total organic matter (TOM), calcium carbonate (CaCO<sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;">) were analyzed. The samples were processed in an elemental analyzer coupled with a mass spectrometer after the elimination of calcium carbonate. The obtained data were the grain-size, TOM, CaCO</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;">, elemental (C, N) and the stable isotopic ratios of </span><i><span style="font-family:Verdana;">δ</span></i><sup><span style="font-family:Verdana;">13</span></sup><span style="font-family:Verdana;">C e </span><i><span style="font-family:Verdana;">δ</span></i><sup><span style="font-family:Verdana;">15</span></sup><span style="font-family:Verdana;">N of SOM. Based on the measured values of carbon and nitrogen, the C/N ratio, associated to </span><i><span style="font-family:Verdana;">δ</span></i><sup><span style="font-family:Verdana;">13</span></sup><span style="font-family:Verdana;">C e </span><i><span style="font-family:Verdana;">δ</span></i><sup><span style="font-family:Verdana;">15</span></sup><span style="font-family:Verdana;">N, is observed that in the PCS predominates an organic matter of marine origin along its entire length: C < 1%, N < 1%, C/N < 5, </span><i><span style="font-family:Verdana;">δ</span></i><sup><span style="font-family:Verdana;">13</span></sup><span style="font-family:Verdana;">C > -21</span><span><span><span> </span></span></span><span><span><span><span style="font-family:Verdana;">PDB e </span><i><span style="font-family:Verdana;">δ</span></i><sup><span style="font-family:Verdana;">15</span></sup><span style="font-family:Verdana;">N > 8</span><sub><span style="font-family:Verdana;">Ar</span></sub><span style="font-family:Verdana;">. The PCS presents patches of continental origin SOM, associated to the coastal zones adjacent to estuarine systems mouths and covering the paleochannels, which may indicate that this material was carried from the coastal rivers to the offshore areas, possibly by the paleo-valleys that also act as traps of fine sediments and SOM. The statistical analysis indicates the existence of 6 different sedimentary facies and a prevalence of one of them, characterized by poorly-sorted bioclastic sandy-gravel, with low to medium organic contents of marine origin. This indicates that the coastal sedimentary material contributions are low and the local cover is autochthonous of biogenic origin, and deposited according to the surficial topography, morphosedimentary processes and meteoceanographycal conditionings of the study area, typical of moderate hydrodynamic energy environments.</span></span></span></span>展开更多
文摘This work summarizes recently published information on the solar UV broadband irradiation of Pernambuco, Northeast of Brazil. We describe the spatial and temporal distribution of solar UV radiation and its relationship with climatic and geographical conditions. Statistical experimental correlation between solar total irradiation and UV broadband obtained for 03 locations was generalized by the use of Koppen-Geiger Climatic criterium, which was used for mapping the spatial/temporal distribution of broadband UV. The climatological solar radiations used in the correlations were obtained by modeling through satellite and previously verified with terrestrial data. We present one map with the location of the recording stations where the statistical correlations were measured, one annual and 12 monthly contour maps describing monthly daily solar UV radiation levels throughout the territory of Pernambuco. The solar UV irradiation (“broadband”) annual-average daily value in the State of Pernambuco varied from 226 to 268 Wh/m<sup>2</sup>. Seasonal variation of solar UV irradiation in the State of Pernambuco follows, in general and as expected, the climate, relief and seasons of the year. The highest value of monthly solar UV irradiation was observed in the central south region of the state, more precisely in Belém do São Francisco, Floresta, Ibimirim and Buíque in the month of December (summer), with 311.8 Wh/m<sup>2</sup>. The lower value was found in the south Agreste region, in Garanhuns and Caruaru, in the month of June (winter), with 162.2 Wh/m<sup>2</sup>.
文摘In continental shelf areas works where the focus is Geochemistry are widely relevant, due to the vast complexity and uses of these relief features (social, environmental and economic). On the Brazilian Northeast tropical shelves, with emphasis on the Pernambuco Continental Shelf (PCS), the published studies are limited and have aimed at portions closer to the coastline. The objective of the present work is the description of the characteristics and origin of sedimentary organic matter (SOM) in the inner and middle Pernambuco shelf, defining and classifying the local geochemical sedimentary facies. The sampling stations (136) were collected in the study area, and the grain-size, contents of total organic matter (TOM), calcium carbonate (CaCO<sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;">) were analyzed. The samples were processed in an elemental analyzer coupled with a mass spectrometer after the elimination of calcium carbonate. The obtained data were the grain-size, TOM, CaCO</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;">, elemental (C, N) and the stable isotopic ratios of </span><i><span style="font-family:Verdana;">δ</span></i><sup><span style="font-family:Verdana;">13</span></sup><span style="font-family:Verdana;">C e </span><i><span style="font-family:Verdana;">δ</span></i><sup><span style="font-family:Verdana;">15</span></sup><span style="font-family:Verdana;">N of SOM. Based on the measured values of carbon and nitrogen, the C/N ratio, associated to </span><i><span style="font-family:Verdana;">δ</span></i><sup><span style="font-family:Verdana;">13</span></sup><span style="font-family:Verdana;">C e </span><i><span style="font-family:Verdana;">δ</span></i><sup><span style="font-family:Verdana;">15</span></sup><span style="font-family:Verdana;">N, is observed that in the PCS predominates an organic matter of marine origin along its entire length: C < 1%, N < 1%, C/N < 5, </span><i><span style="font-family:Verdana;">δ</span></i><sup><span style="font-family:Verdana;">13</span></sup><span style="font-family:Verdana;">C > -21</span><span><span><span> </span></span></span><span><span><span><span style="font-family:Verdana;">PDB e </span><i><span style="font-family:Verdana;">δ</span></i><sup><span style="font-family:Verdana;">15</span></sup><span style="font-family:Verdana;">N > 8</span><sub><span style="font-family:Verdana;">Ar</span></sub><span style="font-family:Verdana;">. The PCS presents patches of continental origin SOM, associated to the coastal zones adjacent to estuarine systems mouths and covering the paleochannels, which may indicate that this material was carried from the coastal rivers to the offshore areas, possibly by the paleo-valleys that also act as traps of fine sediments and SOM. The statistical analysis indicates the existence of 6 different sedimentary facies and a prevalence of one of them, characterized by poorly-sorted bioclastic sandy-gravel, with low to medium organic contents of marine origin. This indicates that the coastal sedimentary material contributions are low and the local cover is autochthonous of biogenic origin, and deposited according to the surficial topography, morphosedimentary processes and meteoceanographycal conditionings of the study area, typical of moderate hydrodynamic energy environments.</span></span></span></span>
