Emprego do Índice de Anomalia de Chuva na Variabilidade Pluviométrica da Microrregião Do Curimataú Oriental no Estado da Paraíba

O estudo do clima vem se intensificando desde o século XX com o intuito de verificar as variações climáticas no espaço-tempo” em todo o território brasileiro. Deste modo é notório tentar entender como há uma grande variabilidade pluviométrica, principalmente nos estados do nordeste brasileiro. O objetivo principal deste trabalho é verificar e avaliar a variabilidade pluviométrica da microrregião do Curimataú Oriental no Estado da Paraíba, através da análise espaço-temporal mensal e anual da precipitação. Identificou-se assim os períodos secos e chuvosos da área estudada com o auxílio do Índice de Anomalia de Chuva (IAC). Os dados pluviométricos utilizados na pesquisa correspondem às séries mensais de precipitação no período de 1994 a 2017, fornecidos pela Agência Executiva de Gestões das Águas do Estado da Paraíba. A microrregião do Curimataú Oriental apresenta dois períodos distintos, um de sete meses chuvosos e outro com cinco meses secos. Completa-se ainda que o IAC é um instrumento de expressiva importância na análise desses dados, pois demonstra eficiência para averiguar os períodos extremos (úmidos e secos) e para realizar o monitoramento da precipitação de uma determinada região, município e/ou bacia hidrográfica. Employment of the Rain Anomaly Index in the Pluviometric Variability of the Micro-Region of the Oriental Curimataú in the State of Paraíba A B S T R A C T The study of climate has been intensifying since the 20th century to investigate space-time throughout the Brazilian territory. Thus, it is notorious to try to understand how there is a great climatic variability, mainly in the states of northeastern Brazil. The main objective of this work is to verify and evaluate the climatic variability of the eastern Curimataú microregion in the State of Paraíba, through the monthly and annual spatial-temporal analysis of its precipitation. Thus, the dry and rainy periods of the studied area were identified with the aid of the Rain Anomaly Index (IAC). The pluviometric data used in the research correspond to the monthly series of precipitation in the period from 1994 to 2017, provided by the Executive Agency for Water Management of the State of Paraíba. The Curimataú Oriental microregion has two distinct periods, one with seven rainy months and the other with five dry months. It is also completed that the IAC is an instrument of significant importance in the analysis of these data, as it demonstrates efficiency to ascertain the extreme periods (wet and dry) and to verify the monitoring of a certain region, municipality and / or hydrographic basin.Keyword: Precipitation anomalies, Periods, Variability.

Spatial-temporal analysis of temperature in Lake Shira based on long-term observations

Long-term in-situ measurements of temperature were conducted in lake Shira during 2013-2015. The principal component analysis of temperature time series allowed to identify period of generation and propagation of internal waves. The spectral analysis revealed the dominance of the oscillations with periods of 21.3, 10.6 and 5.3 h.

Creepex as a parameter of seismo-geodynamic studies based on geo-information systems

The GIS-EEDB (the Expert Earthquake Database) and GIS-ENDDB (the Earth’s Natural Disasters DataBase) geoinformation systems implement methods for spatial-temporal analysis of both classical and new characteristics of the seismogeodynamic process. One of the new characteristics is a normalized creepex parameter that can be used in the statistical approach to studying of seismicity to assess a relative contribution of “soft” (creep) and “hard” (explosion) movements to the overall process of focal radiation. In this paper, the following modifications of the creepex parameter are proposed and compared: 1) Cr0 Cr0_world and CrN CrN world as the result of reducing the parameters Cr0 and CrN of each event to the world average values of the creepex, obtained from the polynomial dependence of Cri_world (i = 0, N) on MS_world where Cri_world are calculated based on the world average estimates of Ms_world and mb_world at uniform intervals of the seismic moment (NEIC catalog), 2) Cr_bji as the result of reducing CrN of each event to CrN_bji i.e. to the average for the studied in this work BJI catalog creepex values obtained from the polygonal trend CrN (MS) of all the catalog events. The advantage of using the creepex parameter, reduced to the trend of averaging the magnitudes of the catalog in question, is revealed, since the smallest linear dependence of the creepex on the magnitude is achieved (in comparison with the classical and normalized creepex) and the symmetry in the maximum amplitude of the deviation of the parameter relative to zero is preserved. Examples of the application of the compared parameters in specific seismic-geodynamic studies of aftershock processes of the Molucca and Simushir earthquakes also demonstrate the advantage of the parameter Cr_bji n the observed correspondence of the variations of the latter to the known physical processes in the focal zone of the Kashmir event, studied by the seismic-geodynamic methods of the GIS-EEDB geographical information system.