Volume 22 (2022)

Wavelet Spectral Analysis: A Concise Review.

This article presents a short but concise review of one of the most used techniques in signal processing, the wavelet spectral analysis (WSA) via the continuous wavelet transform (CWT) for the uni- and bi-variate cases. This mathematical tool is very useful to analyse any kind of data that are not stationary, that is, data that their main statistical properties (such as the mean or the variance) can change with time.

Pag. 51-95, 27-Abr, 1390 kB

Urban constraints of Seville (Spain) against meteorological extremes. Century XVI.

This article estimates the behavior of the weather in Seville during the 16th century. In particular, the period between 1519-1522, which coincides with the first circumvallation of the globe by Elcano Magallanes. The beginning and end of said voyage was the river port of Seville, exactly 500 years ago this year. The urban conditions of the city in the face of climatic risks are described and documentary information, collected from different historical sources, details the most relevant weather. This enables us to examine the climate history within the context of the general history of the city.

Pag. 35-50, 08-Abr, 378 kB

Climate change in Peru. Implications for environmental policies.

The effects of climate change that are being generated worldwide, the governments of the world are concerned and committed, through the development of environmental policies to reduce and / or mitigate harmful natural disasters in the society and economy of the peoples. Therefore, the Peruvian government raises the need to reduce pollution from the main productive activities, through the implementation of standards that allow regulation and regulation. In this context, the research aims to evaluate the effectiveness of environmental policies against climate change in Peru.

Pag. 24-34, 25-Mar, 316 kB

A logistic model for climatological series in a region of the Andes of Venezuela

The objective of this paper was to evaluate a series of monthly rainfall by a multinomial logistic regression model in order to compare the trend, seasonality and presence of outliers of monthly precipitation. For which were used data from San Cristobal weather station in Tachira state and simulated series of models of extreme events; Pearson Type III, Type I Gumbel, Log-normal and log-Pearson Type III.

Pag. 12-23, 20-Feb, 440 kB

Monthly modeling 11 years in advance of the Standardized Precipitation Index (SPI) in Villa Clara, Cuba.

The objective of the present work is to study the behavior of the indicators of climatic extremes in Sagua la Grande, Villa Clara. The data used were the series of maximum temperature (Tx), minimum temperature (Tn) and precipitation (RR) in the period 1977-2017. They are part of the data file of the Villa Clara Provincial Meteorological Center (CMP.VC); as well as the daily series of precipitation of the pluviometric network of the Villa Clara Hydraulic Utilization Company (EAH-VC). The Rclimdex-extraQc software and the RH-Test tool were used.

Pag. 1-11, 15-Feb, 481 kB

Volume 21 (2021)

Environmental awareness in university students in Lima through the mathematization of climatic elements, in times of Covid-19.

In this study, the levels of environmental awareness were determined through the mathematization of three climatic elements (Temperature, Solar Lighting and Wind Speed) and the element that aroused the greatest interest, in the university students of the city of Lima, during the year 2021, in times of Covid-19; with data obtained from Weather Spark; through a questionnaire of sixteen reagents to 176 university students to measure the levels of environmental awareness in its dimensions: cognitive, affective, conative and active. Concluding that more than 50\% of university students had little knowledge of the mathematization of climatic elements for environmental awareness.

Pag. 179-187, 15-Dic, 286 kB

Analysis of meteorological drought in a tropical savannah region of Venezuela, by comparing four drought indices.

The objective of this study was based on the analysis of meteorological drought in a tropical savannah region of Venezuela, by comparing four different drought indices. The information used for the study was obtained from the record of meteorological data, from monthly precipitation series of the agrometeorological station “Ciudad Bolivia”, located within the experimental field of the INIA in the state of Barinas; for the period 1971-2016.

Pag. 167-178, 12-Dic, 246 kB

Detection of meteorological droughts in a tropical dry region of Venezuela, during the period 1982-2015.

The objective of this study was based on detecting meteorological droughts in a tropical dry region of Venezuela. The information used for the study was obtained from the meteorological data record, coming from monthly precipitation series of the meteorological station “El Tigre Automática”, located within the experimental field of the INIA of the Anzoátegui state, for the period 1971-2016.

Pag. 157-166, 09-Nov, 317 kB

Comparative analysis of four indices for the characterization of meteorological droughts in the town of El Tigre, Anzoátegui State, Venezuela.

The objective of this study was based on the comparative analysis of meteorological drought events characterized by the application of four indices, in the town of El Tigre, Anzoátegui state. The information used for the study was obtained from the record of meteorological data, from monthly precipitation series of the meteorological station “El Tigre Automática”, located within the experimental field of the INIA of the state of Anzoátegui, for the period 1971-2016.

Pag. 146-156, 4-Oct, 236 kB

Hydroclimatological extreme events affecting the Daule-Peripa Reservoir (Coast of Ecuador) – Historical dynamics and teleconnections.

An urgent need exists for improved water availability forecasting and monitoring for human activities in response to accelerating climate change. More recently, such planning is under great deal of pressure due to Coronavirus disease 2019 (COVID-19) pandemic and an increasing demand of a reliable provision of clean water for sanitation. The present study analyses spatial and temporal precipitation dynamics as response to very distinctive extreme hydroclimatological events historically affecting the Daule-Peripa Reservoir located in Coast of Ecuador, one of the most climatic vulnerable regions from the Pacific coast of South America, and analyzing the results in terms of foreseeable SST trends.

Pag. 127-145, 20-Sep, 864 kB

Analysis of extreme climatic events associated with excessive rainfall and meteorological frosts in the Cundiboyacense high plateau of Colombia.

Excess rainfall and meteorological frosts are adverse phenomena in agriculture, which cause irreparable damage to the physiology of plants, reducing the biomass productivity of plants. In order to establish those areas of greatest threat to such phenomena, the analysis was carried out for a period of 30 years, using 37 daily climatic series of precipitation and 23 of minimum temperature, located along the Cundiboyacense high plateau, in the central Andean region of Colombia.

Pag. 112-126, 17-Sep, 17 mB

Comparison of four indices for the characterization of meteorological droughts in the town of Guanare, Portuguesa State, Venezuela.

The objective of this study was to compare the results of four indices for the characterization of meteorological droughts in the town of Guanare, Portuguese State. The information used for the study was obtained from the record of meteorological data, from monthly precipitation series of the Airport-Guanare weather station in the state of Portuguesa, for the period 1982-2015.

Pag. 101-111, 16-Jul, 234 kB

The expansion of the South American Arid Diagonal as a consequence of the droughts.

In recent decades, average rainfall in arid-semi-arid zones has been reduced to normal values or lowers than these, in a return to drier climatic conditions. Inter-decadal averages of precipitation are falling relative to the previous long rainy period of 1950-2000.

Pag. 89-100, 24-Jun, 741 kB

Calibration of the Hargreaves equation to calculate the reference crop evapotranspiration (ETo) in Salto, Uruguay.

At the global level, agriculture is the main consumer of water with more than 70\% of the use, using it with an efficiency of around 40\%. The decrease in the water available for agriculture requires that the efficiency of use be increased. One way to increase this efficiency is to accurately quantify the water needs of crops for proper irrigation management. Water needs can be estimated from the reference crop evapotranspiration value (ETo).

Pag. 80-88, 24-Jun, 370 kB

Quality control and homogenization of climatic series for the calculation of extreme climatic indicators in Cuba.

The calculation of the indicators proposed by the Group of Experts in Detection and indicators of Climate Change includes a meticulous process of quality control of the daily series of rainfall, maximum temperature and minimum temperature. Once this process is completed, the data should be subjected to a test of homogeneity, leaving for the analysis only the data series that contain information only due to climate variations and are free from alterations in the measurements due to other causes.

Pag. 65-79, 24-Jun, 1319 kB

Speed and size of raindrops in the period august-september 2020, in Valencia, Venezuela.

The calibration of meteorological radars and the forecasting of disasters caused by high intensity rainfall, together with the assessment of the erosive effect of rainfall require local and seasonal knowledge of the rate and intensity of rainfall. For this it is necessary to evaluate the speed and average size of the raindrops. The results obtained for the precipitations of the rainy period (August-September) in the city of Valencia (Venezuela) are presented, carried out by means of an infrared dysdrometer.

Pag. 52-64, 15-Jun, 412kB

Indicators of climatic extremes in Sagua la Grande, Villa Clara, Cuba.

The objective of this work is to study the behavior of the indicators of climatic extremes in Sagua la Grande, Villa Clara. The data used were the series of maximum temperature (Tx), minimum temperature (Tn) and precipitation (RR) in the period 1977-2017. They are part of the data file of the Provincial Meteorological Center of Villa Clara (CMP.VC); as well as the daily precipitation series of the rainwater network of the Villa Clara Hydraulic Utilization Company (EAH-VC).

Pag. 42-51, 15-Jun, 430kB

Analysis of indicators of thermal extremes and their relationship with some factors and elements of climate in the central region of Cuba

In Cuba, the studies related to the behavior of the climático extreme index of temperature have revealed an increasing trends of extreme hot events and a decreasing in cold ones in most of the meteorological stations analyzed. The objective of this research is to analyze the changes in the trend of these index and their relationship with some factors and elements of the climate in the central region of Cuba during the period 1980-2017.

Pag. 26-41, 05-Apr, 1096 kB

Preliminary study of global solar radiation in Cuba from theoretical models

The objective of this work is to publicize the advances that have been made for the knowledge of the solar radiation weather variable in the Republic of Cuba using theoretical models for this purpose. The values of theoretical solar radiation in the Republic of Cuba, from the Hottel model, were calculated with the use of RSE-SOL software.

Pag. 15-25, 05-Abr, 901 kB

Study of climatological series using linear discriminant analysis. Case: Río Guanare basin, Venezuela

The objective of this investigation was to compare monthly precipitation series by means of the discriminant analysis in order to study the trend and seasonality of the precipitation associated with the Guanare River basin in Venezuela. Data from the Aeropuerto-Guanare meteorological station and series generated by Montecarlo simulation based on the models were used; Pearson III, Gumbel I, Log-normal, Log-Pearson III and a linear model with two harmonics and AR(1) autoregressive errors.

Pag. 1-14, 05-Apr, 833 kB

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