Trace element composition of size-fractionated suspended particulate matter samples from the Qatari Exclusive Economic Zone of the Arabian Gulf: the role of atmospheric dust
<p dir="ltr">We analyzed net-tow samples of natural assemblages of plankton, and associated particulate matter, from the Exclusive Economic Zone (EEZ) of Qatar in the Arabian Gulf. Size-fractionated suspended particles were collected using net tows with mesh sizes of 50 and 200 µm to...
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2020
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| _version_ | 1864513510838370304 |
|---|---|
| author | Oguz Yigiterhan (14151006) |
| author2 | Ebrahim Mohd Al-Ansari (18810193) Alex Nelson (5066609) Mohamed Alaa Abdel-Moati (18810196) Jesse Turner (18810199) Hamood Abdulla Alsaadi (18810202) Barbara Paul (18810205) Ibrahim Abdullatif Al-Maslamani (18810208) Mehsin Abdulla Al-Ansi Al-Yafei (18810211) James W. Murray (2269330) |
| author2_role | author author author author author author author author author |
| author_facet | Oguz Yigiterhan (14151006) Ebrahim Mohd Al-Ansari (18810193) Alex Nelson (5066609) Mohamed Alaa Abdel-Moati (18810196) Jesse Turner (18810199) Hamood Abdulla Alsaadi (18810202) Barbara Paul (18810205) Ibrahim Abdullatif Al-Maslamani (18810208) Mehsin Abdulla Al-Ansi Al-Yafei (18810211) James W. Murray (2269330) |
| author_role | author |
| dc.creator.none.fl_str_mv | Oguz Yigiterhan (14151006) Ebrahim Mohd Al-Ansari (18810193) Alex Nelson (5066609) Mohamed Alaa Abdel-Moati (18810196) Jesse Turner (18810199) Hamood Abdulla Alsaadi (18810202) Barbara Paul (18810205) Ibrahim Abdullatif Al-Maslamani (18810208) Mehsin Abdulla Al-Ansi Al-Yafei (18810211) James W. Murray (2269330) |
| dc.date.none.fl_str_mv | 2020-01-27T06:00:00Z |
| dc.identifier.none.fl_str_mv | 10.5194/bg-17-381-2020 |
| dc.relation.none.fl_str_mv | https://figshare.com/articles/journal_contribution/Trace_element_composition_of_size-fractionated_suspended_particulate_matter_samples_from_the_Qatari_Exclusive_Economic_Zone_of_the_Arabian_Gulf_the_role_of_atmospheric_dust/26020822 |
| dc.rights.none.fl_str_mv | CC BY 4.0 info:eu-repo/semantics/openAccess |
| dc.subject.none.fl_str_mv | Earth sciences Geology Oceanography Environmental sciences Ecological applications Trace elements Trace metals Heavy metals Qatari dust Planktonic material Suspended particulate material Marine biogenic material Zooplankton Qatar EEZ Strong acid digestion Berger Leaching Arabian Gulf |
| dc.title.none.fl_str_mv | Trace element composition of size-fractionated suspended particulate matter samples from the Qatari Exclusive Economic Zone of the Arabian Gulf: the role of atmospheric dust |
| dc.type.none.fl_str_mv | Text Journal contribution info:eu-repo/semantics/publishedVersion text contribution to journal |
| description | <p dir="ltr">We analyzed net-tow samples of natural assemblages of plankton, and associated particulate matter, from the Exclusive Economic Zone (EEZ) of Qatar in the Arabian Gulf. Size-fractionated suspended particles were collected using net tows with mesh sizes of 50 and 200 µm to examine the composition of small- and large-size plankton populations. Samples were collected in two different years (11 offshore sites in October 2012 and 6 nearshore sites in April 2014) to examine temporal and spatial variabilities. We calculated the excess metal concentrations by correcting the bulk composition for inputs from atmospheric dust using aluminum (Al) as a lithogenic tracer and the metal∕Al ratios for average Qatari dust. Atmospheric dust in Qatar is depleted in Al and enriched in calcium (Ca), in the form of calcium carbonate (CaCO<sub>3</sub>), relative to the global average Upper Continental Crust (UCC). To evaluate the fate of this carbonate fraction when dust particles enter seawater, we leached a subset of dust samples using an acetic acid–hydroxylamine hydrochloride (HAc–HyHCl) procedure that should solubilize CaCO<sub>3</sub> minerals and associated elements. As expected, we found that Ca was removed in Qatari dust; however, the concentrations (ppm) for most elements actually increased after leaching because the reduction in sample mass resulting from the removal of CaCO<sub>3</sub> by the leach was more important than the loss of metals solubilized by the leach. Because surface seawater is supersaturated with respect to CaCO<sub>3</sub> and acid-soluble Ca is abundant in the particulate matter, we only used unleached dust for the lithogenic correction. Statistical analysis showed that for many elements the excess concentrations were indistinguishable from zero. This suggested that the concentrations of these elements in net-tow plankton samples were mostly of lithogenic (dust) origin. These elements include Al, Fe, Cr, Co, Mn, Ni, Pb, and Li. For several other elements (Cd, Cu, Mo, Zn, and Ca) the excess concentrations present after lithogenic correction are most likely of biogenic/anthropogenic origin. The excess concentrations, relative to average dust, for most elements (except Cd) decreased with distance from the shore, which may be due to differences in biology, currents, proximity to the coast, or interannual processes.</p><h2>Other Information</h2><p dir="ltr">Published in: Biogeosciences<br>License: <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank">https://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.5194/bg-17-381-2020" target="_blank">https://dx.doi.org/10.5194/bg-17-381-2020</a></p> |
| eu_rights_str_mv | openAccess |
| id | Manara2_0a276c2777dcea0baabf60372d945c1f |
| identifier_str_mv | 10.5194/bg-17-381-2020 |
| network_acronym_str | Manara2 |
| network_name_str | Manara2 |
| oai_identifier_str | oai:figshare.com:article/26020822 |
| publishDate | 2020 |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| rights_invalid_str_mv | CC BY 4.0 |
| spelling | Trace element composition of size-fractionated suspended particulate matter samples from the Qatari Exclusive Economic Zone of the Arabian Gulf: the role of atmospheric dustOguz Yigiterhan (14151006)Ebrahim Mohd Al-Ansari (18810193)Alex Nelson (5066609)Mohamed Alaa Abdel-Moati (18810196)Jesse Turner (18810199)Hamood Abdulla Alsaadi (18810202)Barbara Paul (18810205)Ibrahim Abdullatif Al-Maslamani (18810208)Mehsin Abdulla Al-Ansi Al-Yafei (18810211)James W. Murray (2269330)Earth sciencesGeologyOceanographyEnvironmental sciencesEcological applicationsTrace elementsTrace metalsHeavy metalsQatari dustPlanktonic materialSuspended particulate materialMarine biogenic materialZooplanktonQatar EEZStrong acid digestionBerger LeachingArabian Gulf<p dir="ltr">We analyzed net-tow samples of natural assemblages of plankton, and associated particulate matter, from the Exclusive Economic Zone (EEZ) of Qatar in the Arabian Gulf. Size-fractionated suspended particles were collected using net tows with mesh sizes of 50 and 200 µm to examine the composition of small- and large-size plankton populations. Samples were collected in two different years (11 offshore sites in October 2012 and 6 nearshore sites in April 2014) to examine temporal and spatial variabilities. We calculated the excess metal concentrations by correcting the bulk composition for inputs from atmospheric dust using aluminum (Al) as a lithogenic tracer and the metal∕Al ratios for average Qatari dust. Atmospheric dust in Qatar is depleted in Al and enriched in calcium (Ca), in the form of calcium carbonate (CaCO<sub>3</sub>), relative to the global average Upper Continental Crust (UCC). To evaluate the fate of this carbonate fraction when dust particles enter seawater, we leached a subset of dust samples using an acetic acid–hydroxylamine hydrochloride (HAc–HyHCl) procedure that should solubilize CaCO<sub>3</sub> minerals and associated elements. As expected, we found that Ca was removed in Qatari dust; however, the concentrations (ppm) for most elements actually increased after leaching because the reduction in sample mass resulting from the removal of CaCO<sub>3</sub> by the leach was more important than the loss of metals solubilized by the leach. Because surface seawater is supersaturated with respect to CaCO<sub>3</sub> and acid-soluble Ca is abundant in the particulate matter, we only used unleached dust for the lithogenic correction. Statistical analysis showed that for many elements the excess concentrations were indistinguishable from zero. This suggested that the concentrations of these elements in net-tow plankton samples were mostly of lithogenic (dust) origin. These elements include Al, Fe, Cr, Co, Mn, Ni, Pb, and Li. For several other elements (Cd, Cu, Mo, Zn, and Ca) the excess concentrations present after lithogenic correction are most likely of biogenic/anthropogenic origin. The excess concentrations, relative to average dust, for most elements (except Cd) decreased with distance from the shore, which may be due to differences in biology, currents, proximity to the coast, or interannual processes.</p><h2>Other Information</h2><p dir="ltr">Published in: Biogeosciences<br>License: <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank">https://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.5194/bg-17-381-2020" target="_blank">https://dx.doi.org/10.5194/bg-17-381-2020</a></p>2020-01-27T06:00:00ZTextJournal contributioninfo:eu-repo/semantics/publishedVersiontextcontribution to journal10.5194/bg-17-381-2020https://figshare.com/articles/journal_contribution/Trace_element_composition_of_size-fractionated_suspended_particulate_matter_samples_from_the_Qatari_Exclusive_Economic_Zone_of_the_Arabian_Gulf_the_role_of_atmospheric_dust/26020822CC BY 4.0info:eu-repo/semantics/openAccessoai:figshare.com:article/260208222020-01-27T06:00:00Z |
| spellingShingle | Trace element composition of size-fractionated suspended particulate matter samples from the Qatari Exclusive Economic Zone of the Arabian Gulf: the role of atmospheric dust Oguz Yigiterhan (14151006) Earth sciences Geology Oceanography Environmental sciences Ecological applications Trace elements Trace metals Heavy metals Qatari dust Planktonic material Suspended particulate material Marine biogenic material Zooplankton Qatar EEZ Strong acid digestion Berger Leaching Arabian Gulf |
| status_str | publishedVersion |
| title | Trace element composition of size-fractionated suspended particulate matter samples from the Qatari Exclusive Economic Zone of the Arabian Gulf: the role of atmospheric dust |
| title_full | Trace element composition of size-fractionated suspended particulate matter samples from the Qatari Exclusive Economic Zone of the Arabian Gulf: the role of atmospheric dust |
| title_fullStr | Trace element composition of size-fractionated suspended particulate matter samples from the Qatari Exclusive Economic Zone of the Arabian Gulf: the role of atmospheric dust |
| title_full_unstemmed | Trace element composition of size-fractionated suspended particulate matter samples from the Qatari Exclusive Economic Zone of the Arabian Gulf: the role of atmospheric dust |
| title_short | Trace element composition of size-fractionated suspended particulate matter samples from the Qatari Exclusive Economic Zone of the Arabian Gulf: the role of atmospheric dust |
| title_sort | Trace element composition of size-fractionated suspended particulate matter samples from the Qatari Exclusive Economic Zone of the Arabian Gulf: the role of atmospheric dust |
| topic | Earth sciences Geology Oceanography Environmental sciences Ecological applications Trace elements Trace metals Heavy metals Qatari dust Planktonic material Suspended particulate material Marine biogenic material Zooplankton Qatar EEZ Strong acid digestion Berger Leaching Arabian Gulf |