Nevada STORMS project: Measurement of mercury emissions from naturally enriched surfaces

Sources of variability in mercury flux measurements

“…The study area consisted mostly of a gravel surface with sparsely vegetated desert sage, averaging heights of--30 cm. All equipment and groups involved in STORMS (complete description of site, the research groups involved and their location, and the techniques used by Gustin et al [1999] were set up within a 200 x 200 m area. The UG-GSC group collected micrometeorological (MM) flux data between August 31 and September 4, 1997 (day 243-247) and flux chamber (FC) data between September 1 (1700 hours LT) and September 4 (1200 hours LT), 1997.…”

“…These studies have resulted in the establishment of a preliminary log-log relationship between the flux and the soil substrate concentration (Figure 1). During the Nevada STORMS intercomparison experiment [Gustin, 1998;Gustin et al, 1999], several research teams were involved in making flux measurements for a 48-hour period beginning at 1200 hours LT on September 2, 1997, at the Steamboat Springs Geothermal area in Reno, Nevada. This paper presents additional Hg flux data collected over a longer time period (from August 31 to September 4, 1997) and thus includes data collected before, during, and after this intercomparison experiment at the same location.…”

“…An orientation survey was conducted as described by Gustin et al [1999). Substrate samples at all measurement sites were collected and bulk samples were ground and analyzed for total mercury.…”

Quantificação de fluxos de mercúrio gasoso na interface solo/atmosfera utilizando câmara de fluxo dinâmica: aplicação na bacia do Rio Negro

“…Vários estudos já foram realizados com o objetivo de medir in situ as taxas de emissão ou de deposição do mercúrio gasoso total (MGT) na interface solo/atmosfera [8][9][10][11] . Estes estudos utilizam câ-maras de fluxos 8,[12][13][14][15] ou a técnica micrometeorológica da razão modificada de Bowen ("Modified Bowen Ratio, MBR") [16][17][18][19] .…”

“…Considerando que a Amazônia brasileira é coberta por 0,4x10 9 ha de floresta 5 , ou seja, 10% da área coberta por florestas no planeta, justifica-se a importância de se estudar os processos de transferência do Hg nesse ecossistema. Esta necessidade aumenta se for considerada a pequena quantidade de dados já obtidos em áreas de florestas tropicais úmidas, sendo que a maioria dos dados disponíveis são relativos a florestas temperadas e boreais 2,6,7 .Vários estudos já foram realizados com o objetivo de medir in situ as taxas de emissão ou de deposição do mercúrio gasoso total (MGT) na interface solo/atmosfera [8][9][10][11] . Estes estudos utilizam câ-maras de fluxos 8,12-15 ou a técnica micrometeorológica da razão modificada de Bowen ("Modified Bowen Ratio, MBR") [16][17][18][19] .…”