Centro Meteorologico Of Camaguey

Camagüey, Cuba

Centro Meteorologico Of Camaguey

Camagüey, Cuba

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Antuna J.C.,Centro Meteorologico Of Camaguey | Wild M.,ETH Zurich
Atmosfera | Year: 2011

We present the results of a study of the dimming-brightening phenomena in the Wider Caribbean. The da-taset consisted of time series of global radiation from 30 surface stations covering the period 1961-1990. The stations were distributed over the entire region: three in Florida USA, five in the Caribbean, three in México 17 Venezuela and one in Honduras. Results showed in general a predominance of the dimming over this period, registered at 20 of the stations, while brightening was only noted at the remaining 10 sites. Associated trends were statistically significant, at 5% level, at 21 of the total 30 stations (70%). In particular 16 of the stations registering dimming and 5 of the ones showing brightening had statistically significant trends. Considering the physico-geographical distribution of the stations they were grouped in continental and insular-peninsular. The significant trends averaged -0.72 Wm-2 per year for continental stations and -0.82 Wm-2 per year for the insular-peninsular ones. Dimming was more frequent in continental areas, but more intense in the insular peninsular ones.


Antuna J.C.,Centro Meteorologico Of Camaguey | Cachorro V.,University of Valladolid | Estevan R.,Centro Meteorologico Of Camaguey | de Frutos A.,University of Valladolid | And 8 more authors.
Optica Pura y Aplicada | Year: 2012

Saharan dust aerosol optical depth (AOD) sun-photometer measurements conducted at Camagüey, Cuba, during July 2009 are compared with the SKIRON model AOD forecasts and the AOD MODIS measurements. The differences for the daily mean AOD values from SKIRON forecasts and from MODIS measurements (both Terra and Aqua) are lower than the differences of the daily AOD maximums. The results demonstrate the capabilities for developing an alert and tracking system for Saharan dust events across the Atlantic. © Sociedad Española de Óptica.


Barja B.,Centro Meteorologico Of Camaguey | Mogo S.,University of Valladolid | Mogo S.,University of Beira Interior | Mogo S.,Instituto Dom Luis | And 5 more authors.
Environmental Sciences: Processes and Impacts | Year: 2013

Atmospheric aerosol particles were collected at Camagüey, Cuba, during the period from February 2008 to April 2009 in order to know the particulate matter levels (PM) together with a general chemical and absorption characterization. The aerosols collection was carried out with a low volume particulate impactor twice a week. Gravimetric analysis of the particulate matter fractions PM10 and PM1 was carried out. An analysis of the eight major inorganic species (Na+, K+, Ca2+, Mg 2+, NH4 +, Cl-, NO3 - and SO4 2-) using ionic chromatography was conducted. The results were analyzed in two periods, the high aerosol concentration period (May to August) and the period with low aerosol concentration (the other months). During the high concentration period the average PM10 and PM1 levels were 35.11 μg m-3 (std = 15.45 μg m-3) and 16.86 μg m-3 (std = 6.14 μg m -3). During the low concentration period the average PM10 and PM1 levels were 23.13 μg m-3 (std = 5.00 μg m-3) and 13.00 μg m-3 (std = 4.02 μg m-3). For both periods, Cl-, Na+ and NO3 - are the predominant species in the coarse fraction (PM1-10), and SO4 2-and NH4 + are the predominant species in the fine fraction (PM1). The spectral aerosol absorption coefficient, σa, was measured for the wavelength range 400-700 nm with 10 nm steps. The σa values were obtained with a filter transmission method for the fine fraction and were evaluated for 54 days covering a wide range of atmospheric conditions including a Saharan dust intrusion. σa ranges from 8.5 M m-1 to 34.5 M m-1 at a wavelength of 550 nm, with a mean value of 18.7 M m-1. The absorption Ångström parameter, αa, calculated for the pair of wavelengths (450/700 nm) presents a mean value of 0.33 (std = 0.19), which is a very low value comparing with those that can be found in the bibliography. Although the sampling period is short, these data represent the first evaluation of PM values with their chemical and optical absorption characterization in Cuba. In addition to the regional interest, the presented values can be directly used by those working with absorption, forcing by aerosols and radiative transfer calculations in general. Also, these data can be used as input in Global Climate Models. © 2013 The Royal Society of Chemistry.


Barja B.,Centro Meteorologico Of Camaguey | Antuna J.C.,Centro Meteorologico Of Camaguey | Estevan R.,Centro Meteorologico Of Camaguey | Mogo S.,University of Beira Interior | And 3 more authors.
Optica Pura y Aplicada | Year: 2011

Gravimetric measurements of the particulate matter fractions PM10 and PM1, conducted at Camagüey, Cuba are reported. Samples were collected with a low volume particulate impactor Dekati PM10 two times a week, between February and October 2008. Sampling was conducted both under the local background conditions and in the presence of the Saharan dust events. The mean values of particulate matter concentrations were 28.4 μg/m3 and 14.6 μg/m3 for PM10 and PM1, respectively. The maximum/minimum concentrations of particulate matter measured for PM10 and PM1 were 73.3 μg/m3/13.1 μg/m3 and 33.4 μg/m3/4.9 μg/m3, respectively. An analysis of the eight major inorganic species (Na+, K+, Ca2+, Mg2+, NH4+, Cl-, NO3- and SO4 2-) in aerosol samples using ionic chromatography was conducted. An aerosol classification was developed depending on the air masses origins, wind velocity and direction at the measured site. The air masses origins were determined using backward trajectories derived from the HYSPLIT model. © Sociedad Española de Óptica.


Estevan R.,Centro Meteorologico Of Camaguey | Antuna J.C.,Centro Meteorologico Of Camaguey | Barja B.,Centro Meteorologico Of Camaguey | Cachorro V.E.,University of Valladolid | And 7 more authors.
Optica Pura y Aplicada | Year: 2011

Preliminary results from sun photometer CIMEL CE-318 measurements over Camagüey, Cuba, are reported. The instrument belongs to the Iberian Network for Aerosol Measurements (RIMA). The dataset, at the 1.5 level of Aerosol Robotic Network (AERONET), covers the period between October 7th, 2008 and March 29th, 2009. Obtained results, considered as background conditions, allow characterizing the aerosols over Camagüey as Maritime Mixed. Main results showed the average value of the aerosol optical thickness: τa(500 nm)=0.11 and its mode value at τam(500 nm)=0.11 while for the Ångström exponent the average was α=0.87 with mode value of αm=0.70. Relatively high values in both parameters for marine aerosols, agree with reported values by other studies for maritime environments in the Atlantic ocean. A preliminary characterization about aerosol particles size distribution over Camagüey has been conducted. Arrival of Saharan dust layers to our territory, is evident in several episodes that have taken place during the month of July 2009, with an aerosol optical thickness maximum value of τa(500)=0.70 on July 6th. © Sociedad Española de Óptica.


Barja B.,Centro Meteorologico Of Camaguey | Bennouna Y.,University of Valladolid | Toledano C.,University of Valladolid | Antuna J.C.,Centro Meteorologico Of Camaguey | And 4 more authors.
Optica Pura y Aplicada | Year: 2012

One year of Cloud Optical Depth (COD) measurements obtained with the radiometer (sun-photometer Cimel CE - 318), in Camagüey, Cuba, from June 2010 to May 2011, are presented. As the first step an evaluation method is proposed, in order to confirm that a cloud was measured. This method is based on the complementary cloud information derived from the actinometrical observations. In the second step of the work, the statistical results from the first year of the COD measurements in Camagüey were analyzed. The results show the high quality of COD measurements at Camagüey. The analysis of the COD frequency showed two peaks at the intervals centered in 2.5 and 17.5. Similar behavior occurred each month. The COD mean value for the entire period was 24.8, with a standard deviation of 31.7. The mean monthly minimum and maximum value of COD occurred in December, 2010 and May, 2011, respectively. The diurnal cycle of the mean hourly COD values showed an increase in the afternoon hours. At the same time, the number of measured cases decreased. There was correspondence between the COD data obtained with sun-photometer and CALIOP lidar, for the COD values below 5. The results showed in this paper constitute the first report of such measurements in Cuba. © Sociedad Española de Óptica.

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