INIBIOMA   20415
INSTITUTO DE INVESTIGACIONES EN BIODIVERSIDAD Y MEDIOAMBIENTE
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
MULTI-YEAR RECORD OF ATMOSPHERIC MERCURY SPECIES AT A BACKGROUND MOUNTAIN STATION IN ANDEAN PATAGONIA (ARGENTINA): TEMPORAL TRENDS AND METEOROLOGICAL INFLUENCE
Autor/es:
DIEGUEZ, MARÍA DEL CARMEN; D'AMORE, FRANCESCO; SOTO CÁRDENAS, CAROLINA; SPROVIERI, FRANCESCA; GARCÍA, PATRICIA E.; DE SIMONE, FRANCESCO; PIRRONE, NICOLA; BENCARDINO, MARIANTONIA; CASTAGNA, JESSICA; RIBEIRO GUEVARA SERGIO
Lugar:
Cracovia
Reunión:
Congreso; International Congress of Mercury as a Global Pollutant; 2019
Institución organizadora:
ICMGP
Resumen:
Nahuel Huapi National Park (NHNP) is a natural reserve of Patagonia (Argentina) limiting at its western stretch with several active volcanoes of the Andean volcanic belt (Southern Volcanic Zone of South America). The prevailing Pacific winds and the presence of the Andes determine a sharp precipitation and deposition gradient resulting in high mercury levels in western sectors of the Park. The EMMA station (Global Mercury Observation System, GMOS) is the southernmost Hg monitoring site of the continent and was set up within NHNP. This work provides continuous records of Gaseous Elemental Mercury (GEM) concentrations observed from October 2012 to July 2017 as well as on gaseous Gaseous Oxidized Mercury (GOM) and Particle Bound Mercury (PBM) concentrationsmeasured from March 2014 till July 2017. GEM concentrations ranged between 0.21 and 1.47 ng m-3 (mean 0.86 ± 0.16 ng m-3) and seasonal variation characterized by higher spring and summer levels (0.95 ± 0.13 ng m-3 and 0.88 ± 0.15 ng m-3, respectively) compared to winter and autumn concentrations (0.85 ± 0.16 ng m-3 and 0.80 ± 0.15 ng m-3). Day-time GEM levels were higher year-round. GOM variedbetween 0.42 and 37.2 pg m-3 (mean 4.61 ± 4.00 pg m-3) and PBM ranged from 0.42 to 20.1 pg m-3 (mean 3.74 ± 3.41 pg m-3), showing similarly marked seasonal trends with higher concentrations in the dry season (GOM: autumn=5.47 ± 4.39 pg m-3 ; summer=4.64 ± 3.63 pg m-3; PBM: autumn= 6.32 ± 3.41 pg m-3; 3 summer=.21 ± 2.71 pg m-3). GEM levels at EMMA are in the lowest range within the concentration boundaries reported for the Northern-Southern hemispheric gradient. PBM and GOM levels are moderate compared with other southernmonitoring sites and varied more widely than GEM levels. Westerly winds, temperature and relative humidity showed up as the variables driving GEM, GOM and PBM levels at the EMMA Station. Backward Trajectory Analysis performed at different times showed up: i- the influence of long range transport determining low GEM, GOM and PBM levels brought by clean oceanic air masses from the free troposphere coming from the west (W) and southwest (SW) and, ii- the influenceof short-range transport and low elevation air masses from the NW,W and SW causing eventual increases in GOM and PBM levels at GEM levels, coinciding with the local influences of forest fires and volcanic activity upwind the EMMA station.