Tim Papakyriakou
Dados Biográficos
| ID | 8550703 |
|---|---|
| NOME | Tim Papakyriakou |
| PRENOMES | Tim |
| SOBRENOME | Papakyriakou |
| ASSINATURA | PAPAKYRIAKOU T |
| AFILIAÇÕES | University of Manitoba |
| ORCID | 0000-0002-2019-9104 |
| VERIFICADO | Não |
| TOTAL DE OBRAS | 8 |
| TOTAL DE CITAÇÕES | 0 |
| OBRAS COMO AUTOR | 8 |
| OBRAS COMO EDITOR | 0 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 1994 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 2026 |
| ÍNDICE H | 0 |
Assessment of warm bias in ERA5 surface skin temperature over Arctic landfast sea ice
ERA5 is one of the most widely used gridded reanalysis datasets; however, its 0.25° spatial resolution may not be sufficient to resolve the narrow band of landfast sea ice near coastlines, possibly leading to the misrepresentation of the thermodynamic forcing of sea ice growth and melt. In this study, the performance of ERA5 surface skin temperature (SKTERA5) over landfast sea ice was assessed through comparison with in situ observations of surfa…
An overview of the Nemo modelling for the BaySys project
This article is intended as an introduction to discuss the development of a modelling framework to examine simulated climate change and river discharge regulation and their combined impact on marine conditions in the Hudson Bay Complex as a contribution to BaySys, a collaborative project between Manitoba Hydro, Hydro-Quebec, the University of Manitoba, the University of Alberta, Université Laval and Ouranos. In support of this work, a sea ice and…
High biodegradability of riverine dissolved organic carbon in late winter in Hudson Bay, Canada
Hudson Bay, at the southern margin of the Arctic Ocean, receives nearly one-third of Canada’s river discharge and approximately 5.5 Tg of riverine dissolved organic carbon (DOC) annually. Riverine DOC fluxes to Hudson Bay are expected to increase with climate change, but how this increase will influence the biogeochemistry of the coastal waters is largely unknown. In particular, the fate of riverine DOC that enters Hudson Bay during the dark, fro…
Widespread surface water p CO2 undersaturation during ice-melt season in an Arctic continental shelf sea (Hudson Bay, Canada)
Estimating sea–air CO2 fluxes in coastal seas remains a source of uncertainty in global carbon budgets because processes like primary production, upwelling, water mixing, and freshwater inputs produce high spatial and temporal variability of CO2 partial pressure (pCO2). As a result, improving our pCO2 baseline observations in these regions is important, especially in sub-Arctic and Arctic seas that are experiencing strong impacts of climate chang…
Underestimation of surface p CO2 and air-sea CO2 fluxes due to freshwater stratification in an Arctic shelf sea, Hudson Bay
The objective of this study is to quantify the impact of freshwater stratification on the vertical gradients of partial pressure of CO2 (pCO2) and estimates of air-sea CO2 exchange in Hudson Bay during peak sea-ice melt and river runoff. During the spring of 2018, we sampled water in Hudson Bay and Hudson Strait for dissolved inorganic carbon, total alkalinity, salinity, the oxygen stable isotope ratio in the water (δ18O), and other ancillary dat…
Estimates of net community production from multiple approaches surrounding the spring ice-edge bloom in Baffin Bay
Measurements of net community production (NCP) provide an upper constraint on the strength of the oceanic biological pump, the dominant mechanism for removing CO2 from the ocean surface and sequestering it at depth. In this investigation, our objectives were to describe the spatial and temporal variability of NCP associated with the spring ice-edge bloom in Baffin Bay and to identify the key environmental drivers controlling its variability. Usin…
Micrometeorological and Thermal Control of Frost Flower Growth and Decay on Young Sea Ice
Frost flowers are transient crystal structures that form on new and young sea ice surfaces. They have been implicated in a variety of biological, chemical, and physical processes and interactions with the atmosphere at the sea ice surface. We describe the atmospheric and radiative conditions and the physical and thermal properties of the sea ice and atmosphere that form, decay, and destroy frost flowers on young sea ice. Frost flower formation oc…
On the Validation of Satellite-Derived Sea Ice Surface Temperature
The surface temperature of sea ice controls the rate of ice growth and heat exchange between the ocean and the atmosphere. An algorithm for the satellite retrieval of ice surface temperature has recently been published, but due to the lack of validation data has not been extensively tested. In this paper, data from a recent Arctic field experiment is used in an attempt to validate that algorithm. While the procedure is, in principle, straightforw…
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On the Validation of Satellite-Derived Sea Ice Surface Temperature
The surface temperature of sea ice controls the rate of ice growth and heat exchange between the ocean and the atmosphere. An algorithm for the satellite retrieval of ice surface temperature has recently been published, but due to the lack of validation data has not been extensively tested. In this paper, data from a recent Arctic field experiment is used in an attempt to validate that algorithm. While the procedure is, in principle, straightforw…
Micrometeorological and Thermal Control of Frost Flower Growth and Decay on Young Sea Ice
Frost flowers are transient crystal structures that form on new and young sea ice surfaces. They have been implicated in a variety of biological, chemical, and physical processes and interactions with the atmosphere at the sea ice surface. We describe the atmospheric and radiative conditions and the physical and thermal properties of the sea ice and atmosphere that form, decay, and destroy frost flowers on young sea ice. Frost flower formation oc…
Underestimation of surface p CO2 and air-sea CO2 fluxes due to freshwater stratification in an Arctic shelf sea, Hudson Bay
The objective of this study is to quantify the impact of freshwater stratification on the vertical gradients of partial pressure of CO2 (pCO2) and estimates of air-sea CO2 exchange in Hudson Bay during peak sea-ice melt and river runoff. During the spring of 2018, we sampled water in Hudson Bay and Hudson Strait for dissolved inorganic carbon, total alkalinity, salinity, the oxygen stable isotope ratio in the water (δ18O), and other ancillary dat…
Estimates of net community production from multiple approaches surrounding the spring ice-edge bloom in Baffin Bay
Measurements of net community production (NCP) provide an upper constraint on the strength of the oceanic biological pump, the dominant mechanism for removing CO2 from the ocean surface and sequestering it at depth. In this investigation, our objectives were to describe the spatial and temporal variability of NCP associated with the spring ice-edge bloom in Baffin Bay and to identify the key environmental drivers controlling its variability. Usin…
High biodegradability of riverine dissolved organic carbon in late winter in Hudson Bay, Canada
Hudson Bay, at the southern margin of the Arctic Ocean, receives nearly one-third of Canada’s river discharge and approximately 5.5 Tg of riverine dissolved organic carbon (DOC) annually. Riverine DOC fluxes to Hudson Bay are expected to increase with climate change, but how this increase will influence the biogeochemistry of the coastal waters is largely unknown. In particular, the fate of riverine DOC that enters Hudson Bay during the dark, fro…
Widespread surface water p CO2 undersaturation during ice-melt season in an Arctic continental shelf sea (Hudson Bay, Canada)
Estimating sea–air CO2 fluxes in coastal seas remains a source of uncertainty in global carbon budgets because processes like primary production, upwelling, water mixing, and freshwater inputs produce high spatial and temporal variability of CO2 partial pressure (pCO2). As a result, improving our pCO2 baseline observations in these regions is important, especially in sub-Arctic and Arctic seas that are experiencing strong impacts of climate chang…
An overview of the Nemo modelling for the BaySys project
This article is intended as an introduction to discuss the development of a modelling framework to examine simulated climate change and river discharge regulation and their combined impact on marine conditions in the Hudson Bay Complex as a contribution to BaySys, a collaborative project between Manitoba Hydro, Hydro-Quebec, the University of Manitoba, the University of Alberta, Université Laval and Ouranos. In support of this work, a sea ice and…
Assessment of warm bias in ERA5 surface skin temperature over Arctic landfast sea ice
ERA5 is one of the most widely used gridded reanalysis datasets; however, its 0.25° spatial resolution may not be sufficient to resolve the narrow band of landfast sea ice near coastlines, possibly leading to the misrepresentation of the thermodynamic forcing of sea ice growth and melt. In this study, the performance of ERA5 surface skin temperature (SKTERA5) over landfast sea ice was assessed through comparison with in situ observations of surfa…
Arctic and Antarctic ice dynamics (8 obras) · Environmental Science (7 obras) · Geology (7 obras) · Oceanography (7 obras) · Arctic (5 obras) · Bay (5 obras) · Geography (5 obras) · Sea ice (5 obras) · Climatology (4 obras) · Climate change and permafrost (3 obras)