PHOSPHOTRAC · Speciation, sources, and fate of atmospheric organic phosphorus over the Mediterranean Sea: A missing piece of the P cycle?
Horizon 2020 — Marie Skłodowska-Curie Actions
- Duration
- 2016-09-01 → 2018-12-21
- EU contribution
- €185,076
- Participants
- 1
- Scheme
- MSCA-IF
Lines connect the coordinator with its partners.
Results in brief
Speciation, sources, and fate of atmospheric organic phosphorus over the Mediterranean Sea: A missing piece of the P cycle?
Phosphorus affects primary productivity in large areas of oceanic ecosystems. The main source of externally supplied nutrients in many marine ecosystems is the atmosphere. As the ocean is an important sink of atmospheric CO2, P through productivity limitation can indirectly affect global warming by removing more CO2 from the atmosphere. The importance of organic P as a potential pool of bioavailable P in the atmosphere is not widely recognized. The only available data in the literature are the atmospheric measurements of Phosphate and total P, while there are almost no data about the organic P, especially over the Mediterranean Sea (MS). Studies in the east MS reveal that it is highly depleted in P relative to N. Now, it is well known that the atmosphere is an important P path for the area. Indeed, the atmosphere is the dominant nutrient path for PO43- in the eastern MS compared with the riverine inputs at 60%. Orthophosphate is the most soluble form of inorganic P and can be consumed by organisms, which convert it in organic or other inorganic forms. The organic P pool contains unknown compounds that may also be bioavailable for some microorganisms. The main goal of Phosphotrac was to identify those organic P compounds, defining their role to the biogeochemical cycle of P over the MS. The specific objectives of the project were: • Identification of atmospheric organic P sources by the chemical characterization of atmospheric organic P fraction over the MS and the chemical analysis of specific tracers, followed by a statistical analysis of the acquired data (WP1) • Estimation of atmospheric P deposition fluxes and the study of the influence of atmospheric acidity to organic P pool solubility by the implementation of atmospheric transport model TM4-ECPL, coupled with the thermodynamic model ISORROPIA-II (WP2) • Assessment of the biogeochemical role of atmospheric organic P in the MS marine ecosystem (WP3)
Data: CORDIS, © European Union
Project objective
Phosphorus is a critical nutrient affecting primary productivity in large areas in oceanic ecosystems. The principal source of externally supplied nutrients in many marine ecosystems is the atmospheric deposition. As the ocean is an important sink of atmospheric CO2, phosphorus through productivity limitation can indirectly affect global warming by removing more CO2 from the atmosphere. The importance of organic P as a potential pool of bioavailable P in the atmosphere is not widely recognized. It is important to note that the only available data in the literature are the atmospheric measurements of phosphate and total phosphorus, while there are almost no data about the organic P, especially over Mediterranean Sea (MS). The main goal of PHOSPHOTRAC is to shed light on the atmospheric organic P chemical identification and to test the hypothesis that the increased acidification of the atmosphere may significantly impact the bioavailability of organic P. PHOSPHOTRAC proposes new methodologies and modern instrumentation for the identification of organic P compounds in the atmosphere. Most of them are implemented for the first time in atmospheric samples, and they will provide new insights into a nutrient cycle of P in MS. Organic P-rich compounds of interest are DNA, RNA, ATP, phytic acid, phospholipids, degradation products of chemical weapons, organophosphate ester flame retardants and organophosphorous pesticides. Further identification of atmospheric organic P sources in the region will be performed by using the chemical analysis data of specific tracers (ergosterol, anhydrosugars, trace metals), with statistical analysis, and implementation of atmospheric transport model TM4-ECPL coupled with the thermodynamic model ISORROPIA-II. The proposed project is highly interdisciplinary as it combines analytical chemistry, biology, and atmospheric modeling in order to address a question of extreme ecological importance related to climate change in the MS.
Original text from CORDIS.
Participants
- UNIVERSITE D'AIX MARSEILLE · MarseilleCoordinatorFrance
Links
Data: CORDIS, © European Union