Molybdenum and uranium from remote continental origin at Pico summit, Pico island, Azores, Portugal

Date

2007-10-12

Author

Freitas, Maria do Carmo
Pacheco, Adriano M. G.
Tuncel, Guedal

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

113
views

0
downloads

The present study looks into aerosols collected by a land-based, seven-wavelength Aethalometer, from the lower-free troposphere close to the summit of the Pico mountain (top height: 2351 m; sampling height: 2225 m), in Pico island, Azores, Portugal. Following suitable handling and preparation procedures, all samples were put through instrumental neutron activation analysis (INAA; k(0)-variant) for elemental assessment. Archival data have been used as an input to the HYSPLIT model (courtesy of NOAA ARL READY Website) for computing isentropic, backward trajectories of air masses reaching the Pico atmosphere. The results point to significant enrichments of molybdenum and uranium in high-altitude aerosols, especially in the summer samples. A local origin for either element is most unlikely though: Pico is a rural island, and there are no comparable records from low-altitude stations in the Azores at large. On the contrary, long-range transport from remote sources in continental areas-Europe and North-Central America-is rather compatible with the synoptic, elemental pathways converging over the Pico observatory for the period under study.

Subject Keywords

Azores archipelago, Backward-trajectory analysis, Elemental enrichment, High-altitude aerosols, Long-range transport, Molybdenum, Uranium

URI

https://hdl.handle.net/11511/66956

Collections

Department of Environmental Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Volcano stratigraphy and petrogenesis of the Nemrut stratovolcano (East Anatolian High Plateau): The most recent post-collisional volcanism in Turkey Ozdemir, Y; Karaoglu, O; Tolluoglu, AO; Güleç, Nilgün Türkan (Elsevier BV, 2006-02-28) The Nemrut stratovolcano, with its well defined summit caldera, is the most recent volcanic eruption center (1441 A.D.) in the East Anatolian High Plateau, one of the best examples of an active colllision zone. Widespread volcanism has been active in this region for the last similar to 10 Ma, producing large volumes of lavas and pyroelastics covering a broad belt, across the Bitlis Suture Zone, from the Anatolian plate in the north to the Arabian plate in the south.
Chemical composition of Eastern Black Sea aerosol-Preliminary results BALCILAR, İLKER; Zararsız, Abdullah; Kalaycı, Yusuf; DOĞAN, GÜRAY; Tuncel, Süleyman Gürdal (2014-08-01) Trace element composition of atmospheric particles collected at a high altitude site on the Eastern Black Sea coast of Turkey was investigated to understand atmospheric transport of pollutants to this semi-closed basin. Aerosol samples were collected at a timber-storage area, which is operated by the General Directorate of Forestry. The site is situated at a rural area and is approximately 50 km to the Black Sea coast and 200 km to the Georgia border of Turkey. Coarse (PM2.5-10) and fine (PM2.5) aerosol sam...
Krill transport in the Scotia Sea and environs Hofmann, Eileen E; Klinck, John M; Locarnini, Ricardo A; Fach Salihoğlu, Bettina Andrea; Murphy, Eugene (1998-12-01) Historical observations of the large-scale flow and frontal structure of the Antarctic Circumpolar Current in the Scotia Sea region were combined with the wind-induced surface Ekman transport to produce a composite Bow field. This was used with a Lagrangian model to investigate transport of Antarctic krill. Particle displacements from known krill spawning areas that result from surface Ekman drift, a composite large-scale now, and the combination of the two were calculated Surface Ekman drift alone only tra...
Evaluation of Site Characterizations and Site Effects of the Ankara Basin Turkey Koçkar, Mustafa Kerem; Akgün, Haluk (2007-06-28) The purpose of this study is to assess the in-situ site characteristics and to perform seismic hazard studies of the Upper Pliocene to Pleistocene fluvial and Quaternary alluvial and terrace deposits located towards the west of Ankara. Based on a general engineering geological, geotechnical and seismic characterization of the site, site classification systems were assigned for seismic hazard evaluations. Then, short-period noise recordings of the microtremor measurements at the ground surface have been used...
Noise exposure and work performance analysis in oil industry Dal, U.; Birlik, G. A. (2012-05-27) The petrochemical plant studied in this study is located at an altitude of roughly 2.200 meters from the sea level. Eleven buildings are dispersed over an area of 40.000 m(2). The average temperature in January is -11,4 degrees C and 16,3 degrees C in July. 92 employees work in a shift system (14 days "On" - 14 days "Off") in the plant. Measured L-eq values were in the range of 81,2 to 110,2 dBA. Workplace Index (WPI) was (2,9 / 5,0).

Citation Formats

M. d. C. Freitas, A. M. G. Pacheco, and G. Tuncel, “Molybdenum and uranium from remote continental origin at Pico summit, Pico island, Azores, Portugal,” 2007, vol. 1034, p. 234, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/66956.