Observations of near-inertial oscillations along the Brazilian continental shelf break     

de Freitas  Pedro Paulo  Amorim  Felipe de Luca Lopes  Mill  Guilherme Nogueira  da Costa  Vladimir Santos  Gabioux  Mariela  Cirano  Mauro  Paiva  Afonso de Moraes 《Ocean Dynamics》2019,69(10):1203-1215

Ocean Dynamics - Near-inertial oscillations (NIO) are intermittent motions with a frequency close to the inertial frequency and represent an important fraction of the energy to the currents in the...  相似文献   

Community participation in flood mapping in the Amazon through interdisciplinary methods     

Milena Marília Nogueira de Andrade  Claudio Fabian Szlafsztein 《Natural Hazards》2015,77(3):1491-1500

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Evaluation of wave model performance in the South Atlantic Ocean: a study about physical parameterization and wind forcing calibration     

Kaiser  J&#;lia  Nogueira  Izabel C. M.  Campos  Ricardo M.  Parente  Carlos E.  Martins  Renato P.  Belo  Wellington C. 《Ocean Dynamics》2022,72(2):137-150

Ocean Dynamics - This paper evaluates the performance of the spectral wave model WAVEWATCH III for the South Atlantic Ocean forced by wind inputs from the most recent reanalyses, NCEP/CFSR and...  相似文献   

Contributions of Atlantic tropical cyclones to monthly and seasonal rainfall in the eastern United States 1960�C2007     

Ricardo C. Nogueira  Barry D. Keim 《Theoretical and Applied Climatology》2011,103(1-2):213-227

Tropical cyclone activity in the North Atlantic Basin experiences great variability on intra-annual, interannual, and interdecadal timescales. George Cry found that TC rainfall presents an intra-seasonal pattern over the eastern USA, contributing up to 40% of total monthly rainfall. This study replicates much of what was done by Cry using a denser rain gauge network and more sophisticated techniques for analysis. Rainfall data for this study come from 717 stations from the Historical Climate Network covering 31 states to capture the tropical cyclone (TC) contribution in monthly and seasonal precipitation in the eastern USA. Results showed that September has the highest TC rainfall contribution and the coastal regions of North Carolina, Virginia, and Alabama receive more than 30% of monthly rainfall totals from TCs. Comparisons between 1931?C1960 and 1960?C2007 study periods show that the storm track density shifted slightly eastward, which explains some of differences between the two analyses.  相似文献   

Low-latitude and multiple geomagnetic reversals in the Neoproterozoic Puga cap carbonate, Amazon craton     

R. I. F. Trindade  E. Font  M. S. D'Agrella-Filho  A. C. R. Nogueira  C. Riccomini 《地学学报》2003,15(6):441-446

Palaeomagnetic study of the carbonates that ubiquitously cap glacial deposits may constrain the latitudinal extent of Neoproterozoic glaciations and the duration of the greenhouse recovery. We present the first palaeomagnetic data on the Neoproterozoic cap carbonates covering the Amazon craton, which are folded along the Paraguay Belt. Samples collected at deformed beds along the Paraguay Belt present a single‐polarity secondary magnetization acquired by the end of the Brasiliano orogeny (540–520 Ma). In the cratonic area, a dual‐polarity component was isolated in dolostones at the base of the sequence. The presence of a stratabound reversal stratigraphy along with high unblocking temperatures strongly suggest that this magnetization is primary. This result implies a low palaeolatitude (22+6/?5°) for the Amazon block just after deposition of Puga diamictites. In addition, the presence of multiple reversals across the first 20 m of the cap carbonate sequence suggests that their sedimentation must have spanned hundreds of thousands of years at least.  相似文献   

Geography of crime in a Brazilian context: an application of social disorganization theory     

Silas Nogueira de Melo  Lindon Fonseca Matias 《Urban geography》2017,38(10):1550-1572

Geography of crime research dates back to the early 1800s, most of which in English and in the context of the United States and Europe, but with a growing and significant literature studying the developing world. We contribute to this literature through an application of social disorganization theory in a Latin American context: Campinas, Brazil. We consider a number of property and violent crime types using census tracts as the spatial unit of analysis. Implementing a spatial regression method, we find support for social disorganization theory, but not as strong as similar studies in Europe and North America. However, because of the context of Campinas, Brazil, a different understanding of the local conditions proves to be important for understanding the geography of crime in this context. The implications of these results are discussed in the context of theoretical developments as well as crime prevention initiatives.  相似文献   

Global perturbation of the marine Ca isotopic composition in the aftermath of the Marinoan global glaciation     

J.C. Silva-Tamayo  T.F. Nägler  A.N. Sial  A. Nogueira  K. Kyser  C. Riccomini  N.P. James  G.M. Narbonne  I.M. Villa 《Precambrian Research》2010

Ca isotopic compositions of Marinoan post-glacial carbonate successions in Brazil and NW Canada were measured. Both basal dolostones display δ^44/40Ca values between 1 and 0.7‰, overlying limestones show a negative Ca isotope excursion to values around 0.1‰, and δ^44/40Ca values rapidly increase up-section to near 2.0‰. In the Brazilian successions, those high δ^44/40Ca values rapidly decrease and stabilize to values between 0.6 and 0.9‰. These Ca isotope secular variation trends are unlike those of Sturtian post-glacial carbonate successions, but similar to those of Marinoan post-glacial carbonate successions in Namibia, suggesting that the perturbation of the marine Ca cycle was global. This recommends Ca isotope stratigraphy as a tool to correlate Neoproterozoic post-glacial carbonate successions worldwide.  相似文献   

Seasonal and short-term controls of riparian oxygen dynamics and the implications for redox processes     

Guilherme E. H. Nogueira  Christian Schmidt  Nico Trauth  Jan H. Fleckenstein 《水文研究》2021,35(2):e14055

Riparian zones are highly-dynamic transition zones between surface water (SW) and groundwater (GW) and function as key biogeochemical-reactors for solutes transitioning between both compartments. Infiltration of SW rich in dissolved oxygen (DO) into the riparian aquifer can supress removal processes of redox sensitive compounds like NO₃⁻, a nutrient harmful for the aquatic ecosystem at high concentrations. Seasonal and short-term variations of temperature and hydrologic conditions can influence biogeochemical reaction rates and thus the prevailing redox conditions in the riparian zone. We combined GW tracer-tests and a 1-year high-frequency dataset of DO with data-driven simulations of DO consumption to assess the effects of seasonal and event-scale variations in temperature and transit-times on the reactive transport of DO. Damköhler numbers for DO consumption (DA_DO) were used to characterize the system in terms of DO turnover potential. Our results suggest that seasonal and short-term variations in temperature are major controls for DO turnover and the resulting concentrations at our field site, while transit-times are of minor importance. Seasonal variations of temperature in GW lead to shifts from transport-limited (DA_DO > 1) to reaction-limited conditions (DA_DO < 1), while short-term events were found to have minor impacts on the state of the system, only resulting in slightly less transport-limited conditions due to decreasing temperature and transit-times. The data-driven analyses show that assuming constant water temperature along a flowpath can lead to an over- or underestimation of reaction rates by a factor of 2–3 due to different infiltrating water temperature at the SW–GW interface, whereas the assumption of constant transit-times results in incorrect estimates of NO₃⁻ removal potential based on DA_DO approach (40%–50% difference).  相似文献   

Reassessing the origin of Triton     

E. Nogueira  R. Gomes 《Icarus》2011,214(1):113-130

The origin of Neptune’s large, circular but retrograde satellite Triton has remained largely unexplained. There is an apparent consensus that its origin lies in it being captured, but until recently no successful capture mechanism has been found. Agnor and Hamilton (Agnor, C.B., Hamilton, D.P. [2006]. Nature 441, 192-194) demonstrated that the disruption of a trans-neptunian binary object which had Triton as a member, and which underwent a very close encounter with Neptune, was an effective mechanism to capture Triton while its former partner continued on a hyperbolic orbit. The subsequent evolution of Triton’s post-capture orbit to its current one could have proceeded through gravitational tides (Correia, A.C.M. [2009]. Astrophys. J. 704, L1-L4), during which time Triton was most likely semi-molten (McKinnon, W.B. [1984]. Nature 311, 355-358). However, to date, no study has been performed that considered both the capture and the subsequent tidal evolution. Thus it is attempted here with the use of numerical simulations. The study by Agnor and Hamilton (Agnor, C.B., Hamilton, D.P. [2006]. Nature 441, 192-194) is repeated in the framework of the Nice model (Tsiganis, K., Gomes, R., Morbidelli, A., Levison, H.F. [2005]. Nature 435, 459-461) to determine the post-capture orbit of Triton. After capture Triton is then subjected to tidal evolution using the model of Mignard (Mignard, F. [1979]. Moon Planets 20, 301-315; Mignard, F. [1980]. Moon Planets 23, 185-201). The perturbations from the Sun and the figure of Neptune are included. The perturbations from the Sun acting on Triton just after its capture cause it to spend a long time in its high-eccentricity phase, usually of the order of 10 Myr, while the typical time to circularise to its current orbit is some 200 Myr, consistent with earlier studies. The current orbit of Triton is consistent with an origin through binary capture and tidal evolution, even though the model prefers Triton to be closer to Neptune than it is today. The probability of capturing Triton in this manner is approximately 0.7%. Since the capture of Triton was at most a 50% event - since only Neptune has one, but Uranus does not - we deduce that in the primordial trans-neptunian disc there were some 100 binaries with at least one Triton-sized member. Morbidelli et al. (Morbidelli, A., Levison, H.F., Bottke, W.F., Dones, L., Nesvorný, D. [2009]. Icarus 202, 310-315) concludes there were some 1000 Triton-sized bodies in the trans-neptunian proto-planetary disc, so the primordial binary fraction with at least one Triton-sized member is 10%. This value is consistent with theoretical predictions, but at the low end. If Triton was captured at the same time as Neptune’s irregular satellites, the far majority of these, including Nereid, would be lost. This suggests either that Triton was captured on an orbit with a small semi-major axisa ? 50R_N (a rare event), or that it was captured before the dynamical instability of the Nice model, or that some other mechanism was at play. The issue of keeping the irregular satellites remains unresolved.  相似文献   

Survival of sardine larvae off the Atlantic Portuguese coast: a preliminary numerical study     

Santos  Aires J.P.; Nogueira  Joao; Martins  Helder 《ICES Journal of Marine Science》2005,62(4):634-644

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