INVESTIGADORES
DIEGUEZ Maria Del Carmen
congresos y reuniones científicas
Título:
Atmospheric fluxes of mercury and speciation in Nahuel Huapi National Park (Patagonia),
Autor/es:
DIÉGUEZ MC.
Lugar:
Rende
Reunión:
Workshop; Internal Workshop GOS4M; 2019
Institución organizadora:
GOS4M.org, Group Earth Observation, United Nations
Resumen:
This work provides results including continuous records of Gaseous Elemental Mercury (GEM) concentrations observed from October 2012 to July 2018 as well as on gaseous Gaseous Oxidized Mercury (GOM) and Particle Bound Mercury (PBM) concentrations measured 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 varied between 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 southern monitoring 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 influence of 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.
