Ryan PereiraHeriot-Watt University · Lyell Centre
Ryan Pereira
BSc (Hons.), MSc, PhD
About
31
Publications
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440
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Citations since 2017
Introduction
Skills and Expertise
Additional affiliations
March 2013 - present
September 2009 - February 2013
Publications
Publications (31)
We use first field-based observations of precipitation and river isotopic chemistry from a three-year study (2009-2011) in rainforest and nearby savannah in central Guyana at the northern rim of the Amazon rainforest to establish the quality of modelled or remotely-sensed datasets. Our 3 years of data capture a reduced rainfall regime in 2009 and a...
This study emphasizes the importance of rainstorm events in mobilizing carbon at the soil-stream interface from tropical rainforests. Half-hourly geochemical/isotopic records over a 13.5 hour period from a 20 km2 tropical rainforest headwater in Guyana show an order of magnitude increase in dissolved organic carbon (DOC) concentration in less than...
The dense, intact rainforests of the Guianas (northern Amazonia) are important for the regulation of the local and regional climate, but preclude easy access so a large data gap exists. The rainforest–savannah boundary may also be particularly susceptible to increasing pressures from ecosystem exploitation and climate change. It is important theref...
Protein-like fluorescence intensity in rivers increases with increasing anthropogenic DOM inputs from sewerage and farm wastes. Here, a portable luminescence spectrophotometer was used to investigate if this technology could be used to provide both field scientists with a rapid pollution monitoring tool and process control engineers with a portable...
I'd like to share some of the data from my PhD. The attached is the results of a luxury uptake experiment with Emiliania huxleyi and shows the culture growth (A) and then shows the coupling with NO3 uptake and Fv/Fm which was measured using a Chelsea Instruments LabSTAF. The nitrate is the medium NO3 concentration [S]. I'm excited that Kevin Oxboro...
Mine water geothermal energy could provide sustainable heating, cooling and storage
to assist in the decarbonisation of heat and achieving Net Zero carbon emissions.
However, mined environments are highly complex and we currently lack the
understanding to confidently enable a widespread, cost-effective deployment of the
technology. Extensive and re...
A 9the preliminary work on 9:36 video presentation for the PSA 2021 Conference entered in the Bold award section. I hope this explains that the microbial loop is not necessary for the utilization of DOC and DON by phytoplankton
My presentation for the Heriot-Watt EGIS 2021 Conference on "Innovation that Inspires". I got a get out of jail free card when they expanded the definition of innovation to include changing a field of study. The results shown here demonstrate Emiliania huxleyi utilising DOC and DON during exponential growth with a growth rate of of 0.68 under luxur...
Connecting tropical rainforests to larger rivers, tropical headwaters export large quantities of carbon and nutrients as dissolved organic matter (DOM), and are thus a key component of the global carbon cycle. This DOM transport is not passive, however; sunlight and microbial activity alter DOM concentrations and compositions, affecting riverine gr...
The project MarParCloud (Marine biological production, organic
aerosol Particles and marine Clouds: a process
chain) aims to improve our understanding of the genesis, modification and
impact of marine organic matter (OM) from its biological production, to
its export to marine aerosol particles and, finally, to its ability to
act as ice-nucleating p...
This project combines black shale dissolved organic matter (DOM) leaching with microcosm experiments under controlled conditions. The aim is to determine the abundance and nature of DOM, its availability for microbiological degradation and quantify produced gases (CO2, methane).
The flow (flux) of climate-critical gases, such as carbon dioxide
(CO2), between the ocean and the atmosphere is a fundamental component
of our climate and an important driver of the biogeochemical systems within
the oceans. Therefore, the accurate calculation of these air–sea gas fluxes
is critical if we are to monitor the oceans and assess the im...
Abstract. The project MarParCloud (Marine biological production, organic aerosol Particles and marine Clouds: a process chain) aims at improving our understanding of the genesis, modification and impact of marine organic matter (OM), from its biological production, via its export to marine aerosol particles and, finally, towards its ability to act...
The sea surface microlayer (SML) at the air–sea interface is <1 mm thick, but it is physically, chemically, and biologically distinct from the underlying water and the atmosphere above. Wind-driven turbulence and solar radiation are important drivers of SML physical and biogeochemical properties. Given that the SML is involved in all air–sea exchan...
Since 2017, we investigated iDOM in tropical and temperate rivers across Amazonia and Scotland using the next-generation liquid chromatography organic carbon detection – organic nitrogen detection system utilised by Pereira et al. (2014). Monthly sampling of rivers including the Cree, the Clyde and the Forth show evidence for iDOM mobilisation, but...
We investigated the riverine carbon exports from a two headwater peatland environments in the UK, and examined the potential uncertainty of quantification due to the role of optically “invisible” dissolved organic matter (iDOM). Importantly, our work captured compositional changes of riverine DOM in during an exceptionally dry period and compared t...
SUDS (Sustainable Drainage Systems) retention ponds are an important part of Blue Green Infrastructure and provide multiple benefits, including flood risk alleviation, water quality improvements, recreation, amenity and biodiversity value. Characterisation of sediments and suspended particulate matter (SPM) is important for assessing SUDS functioni...
The flow (flux) of climate critical gases, such as carbon dioxide (CO2), between the ocean and the atmosphere is a fundamental component of our climate and the biogeochemical development of the oceans. Therefore, the accurate calculation of these air-sea gas fluxes is critical if we are to monitor the health of our oceans and changes to our climate...
Ocean CO2 uptake accounts for 20–40% of the post-industrial sink for anthropogenic CO2. The uptake rate is the product of the CO2 interfacial concentration gradient and its transfer velocity, which is controlled by spatial and temporal variability in near-surface turbulence. This variability complicates CO2 flux estimates and in large part reflects...
In the version of this Article originally published, in the ‘Acknowledgements’ section the authors neglected to include the following text: “The Surface Ocean CO2 Atlas (SOCAT) is an international effort, endorsed by the International Ocean Carbon Coordination Project (IOCCP), the Surface Ocean Lower Atmosphere Study (SOLAS) and the Integrated Mari...
Tropical forests are global climate regulators through their interaction with hydrological and biogeochemical cycles. Despite extensive research on deforestation in South America and its global impact, the role of the largely intact Guiana Shield forests, north of the Amazon, has not yet been considered as part of this climate system. We use a regi...
We report the first measurements of surfactant activity (SA) in the sea surface microlayer (SML) and in subsurface waters (SSW) at the ocean basin scale, for two Atlantic Meridional Transect from cruises50°N to 50°S during 2014 and 2015. Northern Hemisphere (NH) SA was significantly higher than Southern Hemisphere (SH) SA in the SML and in the SSW....
We report the first measurements of surfactant activity (SA) in the sea surface microlayer (SML) and in subsurface waters (SSW) at the ocean basin scale, for two Atlantic Meridional Transect from cruises 50°N to 50°S during 2014 and 2015. Northern Hemisphere (NH) SA was significantly higher than Southern Hemisphere (SH) SA in the SML and in the SSW...
Understanding the physical and biogeochemical controls of air–sea gas
exchange is necessary for establishing biogeochemical models for predicting
regional- and global-scale trace gas fluxes and feedbacks. To this end we
report the results of experiments designed to constrain the effect of
surfactants in the sea surface microlayer (SML) on the gas t...
We measured total surfactant activity (SA; Triton T-X-100 equivalent) and CDOM absorbance (cm-1) in the surface microlayer (SML) and subsurface water (SSW) seasonally (2012-2013) along a 20 km coastal transect (North East UK), and evaluated corresponding values of the gas transfer velocity (kw; cm hr-1) using a custom designed air-sea gas exchange...
The tropical rainforests of the Guianas, north of the Amazon, are home to several Amerindian communities, hold high levels of biodiversity and, importantly, remain some of the world's most pristine and intact rainforests. Not only do they have important functions in the global carbon cycle, but they regulate the local and regional climate and help...
Projects
Projects (4)
Applying next genration LOC technology to elucidate nutrient uptake in marine phytoplankton at sub-hourly scales
Tracking the carbon pathway from river systems to different coastal shelf systems. This will also include the transfer of carbon from river systems through the water column to deposition in sediments.
This PhD project will assess the potential for intense periods of hydrological activity to dominate the POM and DOM transported from soils into rivers and assess the mechanisms that are responsible for the mobilisation, transport and storage of reactive C in selected natural and disrupted (e.g. peat extraction, agriculture) environments. Furthermore, this study will examine the characteristics of DOM in terms of composition and reactivity from different environments under changing environmental controls in laboratory experiments.
