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Falk, Stefanie; Vollsnes, Ane Victoria; Berglen Eriksen, Aud; Emberson, Lisa D.; O’Neill, Connie & Stordal, Frode
[Show all 7 contributors for this article]
(2023).
Modelling the effects of ozone pollution on coniferous and deciduous forests.
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Shetty, Shobitha; Schneider, Philipp; Stebel, Kerstin; Kylling, Arve; Berntsen, Terje Koren & Hamer, Paul David
(2023).
Evaluation of TROPOMI observations for estimating surface NO2 concentrations over Europe using XGBoost Model.
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Shetty, Shobitha; Schneider, Philipp; Stebel, Kerstin; Hamer, Paul David; Kylling, Arve & Berntsen, Terje Koren
(2023).
Estimating High Resolution Surface PM2.5 Over Europe Using Satellite AOD Datasets, CAMS Forecast and Machine Learning .
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Bryn, Anders; Horvath, Peter; Torma, Michal; Naas, Adam Eindride; Volden, Inger Kristine & Liahjell, Gunnar Thorsen
[Show all 10 contributors for this article]
(2022).
Treeline research at Natural history museum (UiO)
.
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Tang, Hui; Aas, Kjetil Schanke; Althuizen, Inge; Geange, Sonya Rita; Berntsen, Terje Koren & Vandvik, Vigdis
(2022).
Update on the implementation of moss in CTSM-FATES.
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Shetty, Shobitha; Schneider, Philipp; Stebel, Kerstin; Hamer, Paul David; Kylling, Arve & Berntsen, Terje Koren
(2022).
Synergy of Sentinel 5P and ground measurements to estimate surface NO2 concentration using Machine Learning models.
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Vollsnes, Ane Victoria; Eriksen, Aud Berglen; Falk, Stefanie; Stordal, Frode & Berntsen, Terje Koren
(2022).
Ozone-induced early senescence studied in Trifolium repens genotypes from subarctic grasslands .
Show summary
Previous experiments have shown that several European clovers may develop more visible injuries due to ozone when the night is not dark. At high latitudes, the summer nights are bright, giving the background for the question whether plants adapted to midnight sun also have this response of being more easily injured by ozone when the night is not dark.
The plants included in the present experiment are expected to be adapted to light exposure during night, since there is midnight sun from the time they melt out of the snow cover in spring until the end of July, in the sites where they were collected. This constitutes about 50 % of the growing season for grassland species in these areas.
Cuttings of two genotypes of white clover (Trifolium repens) collected in two sites in subarctic Norway were cultivated under controlled environment conditions. Using a factorial design, the plants were exposed to two different night-time light conditions and two different ozone exposure levels. We studied the development of visible injuries, foliar chlorophyll concentrations and N concentration as signs of premature senescence due to ozone.
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Vollsnes, Ane Victoria; Falk, Stefanie; Eriksen, Aud Else Berglen; Stordal, Frode; Kauserud, Håvard & Berntsen, Terje Koren
(2021).
Luftforurensning og klimaendringer gir dobbelt stress for vegetasjonen.
Naturen.
ISSN 0028-0887.
5,
p. 265–271.
doi:
10.18261/issn.1504-3118-2021-05-10.
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Shetty, Shobitha; Schneider, Philipp; Stebel, Kerstin; Kylling, Arve; Hamer, Paul David & Berntsen, Terje Koren
(2021).
Combining Sentinel-5P and Ground Measurements to estimate surface NO2 Concentrations over Europe Using Machine Learning Models.
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Vollsnes, Ane Victoria; Falk, Stefanie; Berglen eriksen, Aud; Emberson, Lisa D.; O’Neill, Connie & Stordal, Frode
[Show all 7 contributors for this article]
(2021).
Model parameterisation of subarctic vegetation in climate models, an example from an ozone effect study.
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Vollsnes, Ane Victoria; Stordal, Frode; Falk, Stefanie; Eriksen, Aud Berglen; Kauserud, Håvard & Berntsen, Terje Koren
(2021).
Field and lab experiments, plant ecophysiology starting from The double punch.
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Narayanappa, Devaraju; Berntsen, Terje Koren & Stordal, Frode
(2021).
Simulated runoff and river discharge in CTSM version 5.1:
Evaluation over Scandinavia.
Show summary
Reliable representation of terrestrial water and energy balance in global climate models is crucial to better understand the response of the hydrological cycle to climate change. Though the current generation of global climate models have improved substantially, they still fail to represent all terrestrial processes adequately. Specifically simulating runoff and river discharge are important for many applications such as water resources management and future water availability projections. In this study, we use the land surface model component of the Norwegian Earth System Model which is Community Land Model version 5 (CLM5) to evaluate against observation-based estimates of runoff and river discharge data of selected catchments data. For the latest three decades (1985-2015), we compare the CLM5 simulated grid-scale runoff with observation-based gridded runoff estimates (E-RUN version 1.1) and with data from the Global Runoff Data Centre (GRDC). CLM5 is also capable of simulating river discharge to the oceans through the Model for Scale Adaptive River Transport (MOSART) and is applicable across local, regional, and global scales. The 3-hourly 0.5o meteorological forcing for CLM5 was provided by the Global Soil Wetness Project version 3v1, an international land surface modeling project. We also compare the simulated river discharge data with selected station discharge data in Norway and Sweden. I will present the detailed evaluation results at the conference. Briefly, the evaluation analysis suggests the further calibration to hydrologic parameters is needed to improve simulations of runoff and river discharge, especially subsurface runoff.
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Falk, Stefanie; Vollsnes, Ane Victoria; Eriksen, Aud E Berglen; Emberson, Lisa D.; O'Neill, Connie & Stordal, Frode
[Show all 7 contributors for this article]
(2021).
Charakterisierung der subarktischen Ökozone hinsichtlich der Modellierung von Ozonverschmutzung und Klimarisiken.
Show summary
https://www.dpg-verhandlungen.de/year/2021/conference/smuk/part/up/session/5/contribution/2?lang=en
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Falk, Stefanie; Lombardozzi, Danica; Vollsnes, Ane Victoria; Stordal, Frode; Berntsen, Terje Koren & Eriksen, Aud Else Berglen
(2021).
OzoneLUNA: Ozone damage in CLM revisited.
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Falk, Stefanie; Vollsnes, Ane Victoria; Emberson, Lisa D.; O'Neill, Connie; Eriksen, Aud E Berglen & Stordal, Frode
[Show all 7 contributors for this article]
(2021).
Characterizing subarctic biomes for land surface modeling of pollution and climate risk.
Show summary
Here we assess the importance of characterization of key meteorological variables and air pollution profiles on the modeled susceptibility of subarctic vegetation to ozone. Changes in climate (e.g. temperature, water availability) will manifest in both direct and indirect effects influencing the species' sensitivity to air pollution. A likely increase in frequency of persistent heatwaves in the future, will inflict heat related stress while generating favorable conditions for the formation of ambient air ozone, e.g. due to wildfires.
We have monitored ambient air ozone concentrations at the Norwegian Institute of Bioeconomy Research (NIBIO) Environment Centre Svanhovd in Northern Norway in the vegetation period 2018/19. Due to data acquisition problems, ozone concentrations for two weeks in July 2018 were missing from our record. We present a reconstruction based on probability density function with respect to the Swedish and Finnish atmospheric monitoring sites and compare with available surface ozone products for the region. Over all, ozone concentrations did not differ significantly between the two years. While temperatures and global irradiance diverged substantially from the multi annual mean precipitation varied only to some extend.
We investigate the difference in uptake of ozone using the DO3SE model, for typical vegetation at the location. We find that bespoke parameterization for subarctic vegetation is essential for an accurate estimation of Phototoxic Ozone Dose (POD) and an assessment of damage risk. Accurate estimates of the start and length of growing season are also crucial. We find that temperature and its derivative vapor pressure deficit are likely the most important climate variables while the variability of ozone concentration within climatologically reasonable limits plays a minor role.
The use of subarctic parameterization suggests an improvement in risk assessment as POD values are increased in 2018; corroborated by evidence of visible injury in the Svanhovd ozone garden.
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Bryn, Anders; Dalen, Thea Grobstok; Finne, Eirik Aasmo; Heiberg, Hanne; Keetz, Lasse Torben & Nilsen, Irene Brox
[Show all 30 contributors for this article]
(2021).
Natur i endring - samspillet mellom klima og økosystemene.
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Tang, Hui; Aas, Kjetil Schanke; Finne, Eirik Aasmo; Althuizen, Inge; Fisher, Rosie A. & Tømmervik, Hans
[Show all 14 contributors for this article]
(2021).
The impact of moss and lichen on hydrological cycle at surface: a study using CLM-FATES.
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Vollsnes, Ane Victoria; Falk, Stefanie; Eriksen, Aud Else Berglen; Stordal, Frode; Kauserud, Håvard & Berntsen, Terje Koren
[Show all 9 contributors for this article]
(2020).
The double punch: ozone and climate stresses on vegetation.
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Falk, Stefanie; Vollsnes, Ane Victoria; Stordal, Frode; Eriksen, Aud Else Berglen & Berntsen, Terje Koren
(2020).
Surface Ozone in Northern Scandinavia and Implications on Local Vegetation - A Case Study.
Show summary
The Arctic biosphere is subject to comprehensive changes induced by climate change. The highly specialized subartic vegetation will be challenged by both, changing environmental conditions as well as further interference through human activity. Permission of exploitation of natural resources in the Artic is likely to increase the levels of air pollutants which are precursors to ozone.
n the course of our project (OzoNorClim: The Double Punch), we had an ozone monitor installed at the Norwegian Institute for Bioeconomic Research (NIBIO) Svanhovd Research Station operated by the Norwegian Institute for Air Research (NILU). In 2018, a long-lasting heatwave accompanied by extensive forest fires across Europe and Scandinavia enhanced surface ozone concentrations by about 2 ppt above the climatological mean in Northern Scandinavia. Ozone sensitive glover species in the ozone garden at Svanhovd showed clear signs of ozone damage in 2018 but not in 2019. We study these two years as example for probable future scenarios in which both heat stress and ozone stress affect vegetation negatively. We look at the corresponding surface ozone concentrations, accumulated ozone dose, and implications on natural and semi-natural vegetation especially in the Pasvik valley in Northern Norway, put these in a larger regional context, and give an outlook on further modelling work.
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Byre, Hanne Eline; Falk, Stefanie; Stordal, Frode & Berntsen, Terje Koren
(2019).
An Investigation of Source Regions Contributing to the Deposition of Reactive Nitrogen in Arctic and Boreal Areas.
Show summary
Long range atmospheric transport is an important source of reactive nitrogen (Nr) to Boreal and Artic ecosystems. The combined effect of climate change and deposition of reactive nitrogen which is an important nutriant for these systems, have the potential to change the carbon storage in high latitude reservoirs. Furthermore a change in vegetation, will lead to changes in the exchange of energy and humidity between the land surface and the atmosphere. We have conducted several model studies to investigate and quantify the importance and contribution of distinguished source regions to Nr deposition in polar and sub-polar regions in the northern hemisphere. Using a global chemistry transport model, we will assess the following questions: To what extent are emissions from agriculture in South-Asia affecting NOx deposition in the Arctic? What would happen if we shut down the automotive sector in Germany, do we see a reduction in the amount of NOx deposited in Norway?
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Stordal, Frode; Berntsen, Terje Koren; Büker, Patrick; Falk, Stefanie; Rydsaa, Johanne Hope & Gillies, David
[Show all 7 contributors for this article]
(2018).
Ozone and climate stresses on sub-ARctic tundra vegetation: Modelling of stomatal fluxes in midnight sun.
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Vollsnes, Ane Victoria; Eriksen, Aud Berglen; Falk, Stefanie; Berntsen, Terje Koren; Kauserud, Håvard & Emberson, Lisa D.
[Show all 7 contributors for this article]
(2018).
Project The double punch: ozone and climate stresses on vegetation.
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Vollsnes, Ane Victoria; Eriksen, Aud Berglen; Kauserud, Håvard; Berntsen, Terje Koren & Stordal, Frode
(2018).
The double punch: ozone and climate stresses on vegetation.
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Vollsnes, Ane Victoria; Eriksen, Aud Berglen; Berntsen, Terje Koren; Kauserud, Håvard; Büker, Patrick & Emberson, Lisa D.
[Show all 7 contributors for this article]
(2018).
The double punch: ozone and climate stresses to sub-Arctic vegetation.
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Stordal, Frode; Tang, Hui; Berntsen, Terje Koren; Büker, Patrick; Vollsnes, Ane Victoria & Eriksen, Aud Berglen
[Show all 7 contributors for this article]
(2017).
Modelling combined effects of ozone and climate stresses on Arctic and boreal species.
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Lund, Marianne Tronstad; Berntsen, Terje Koren & Fuglestvedt, Jan S.
(2017).
Climate response to ozone perturbations at different altitudes and latitudes.
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Aas, Kjetil Schanke; Westermann, Sebastian; Martin, Leo Celestin Paul & Berntsen, Terje Koren
(2017).
Degrading Palsa Mires in Northern Norway Simulated with a Regional Climate Model with a Subgrid Snow Scheme.
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Tang, Hui; Stordal, Frode; Berntsen, Terje Koren & Bryn, Anders
(2017).
Improve dynamic vegetation model of community land model in simulating Arctic vegetation and its interaction with climate.
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Bryn, Anders; Stordal, Frode; Berntsen, Terje Koren & Tang, Hui
(2017).
Vegetation dynamics - distribution, modelling and feedbacks.
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Bryn, Anders; Potthoff, Kerstin; Horvath, Peter; Volden, Inger Kristine; Tang, Hui & Berntsen, Terje Koren
[Show all 7 contributors for this article]
(2017).
Greening and browning: 100 years of tree- and forest line dynamics.
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Jeanette, Viken; Vollsnes, Ane Victoria; Eriksen, Aud Else Berglen; Berntsen, Terje Koren & Stordal, Frode
(2017).
DO3SEiNORD.
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Tang, Hui; Stordal, Frode; Berntsen, Terje Koren & Bryn, Anders
(2016).
Dynamical vegetation-atmosphere modelling of the boreal zone.
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Skeie, Ragnhild Bieltvedt; Fuglestvedt, Jan S.; Allen, Myles R.; Berntsen, Terje Koren & Peters, Glen Philip
(2015).
National and regional contributions to global climate change.
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Aas, Kjetil Schanke; Dunse, Thorben; Collier, Emily; Schuler, Thomas; Kohler, Jack & Berntsen, Terje Koren
(2014).
Simulating the Climatic Mass Balance of Svalbard Glaciers from 2003 to 2014 Using a Coupled Atmosphere and Climatic Mass-Balance Model.
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Dalsøren, Stig Bjørløw; Fuglestvedt, Jan S.; Samset, Bjørn Hallvard; Berntsen, Terje Koren; Myhre, Gunnar & Eide, Lars Ingolf
[Show all 10 contributors for this article]
(2014).
Does routing matter? Radiative forcing and temperature responses to Arctic transit shipping versus traditional Suez route.
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Hodnebrog, Øivind; Aamaas, Borgar; Berntsen, Terje Koren; Fuglestvedt, Jan S.; Myhre, Gunnar & Samset, Bjørn Hallvard
[Show all 7 contributors for this article]
(2014).
Climate impact of short-lived climate forcers: A case study of emissions from Norway.
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Aas, Kjetil Schanke; Berntsen, Terje Koren; Boike, Julia; Etzelmuller, Bernd; Gisnås, Kjersti & Westermann, Sebastian
(2014).
Simulating the surface energy balance on Svalbard with the Weather Research and Forecasting model.
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Etzelmuller, Bernd; Westermann, Sebastian; Berntsen, Terje Koren; Dunse, Thorben; Gisnås, Kjersti & Hagen, Jon Ove Methlie
[Show all 12 contributors for this article]
(2013).
CRYOMET – Concept and Results for Bridging Models Between the Atmosphere and the Terrestrial Cryosphere (Glacier and Permafrost).
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Berntsen, Terje Koren; Klimont, Zbigniew & Heyes, Chris
(2013).
Contribution of diesel vehicle emissions to Arctic black carbon in the OsloCTM2.
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Etzelmuller, Bernd; Westermann, Sebastian; Berntsen, Terje Koren; Gisnås, Kjersti; Hagen, Jon Ove Methlie & Kristjansson, Jon Egill
[Show all 10 contributors for this article]
(2013).
Bridging models for the terrestrial cryosphere and the atmosphere - The CryoMET project.
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Aas, Kjetil Schanke; Berntsen, Terje Koren; Boike, Julia; Etzelmuller, Bernd; Kristjansson, Jon Egill & Schuler, Thomas
[Show all 8 contributors for this article]
(2013).
Observert og simulert bakke-energibalanse på Svalbard.
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Aas, Kjetil Schanke; Berntsen, Terje Koren; Boike, Julia; Etzelmuller, Bernd; Kristjansson, Jon Egill & Schuler, Thomas
[Show all 8 contributors for this article]
(2013).
Observed and simulated SEB at Ny-Ålesund, Svalbard.
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Aas, Kjetil Schanke; Berntsen, Terje Koren; Boike, Julia; Etzelmuller, Bernd; Kristjansson, Jon Egill & Schuler, Thomas
[Show all 8 contributors for this article]
(2013).
Observed and simulated surface energy budget at Ny-Ålesund, Svalbard.
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Aamaas, Borgar & Berntsen, Terje Koren
(2021).
Metodikk for framstilling av klimaeffekt på kort og lang sikt.
CICERO Senter for klimaforskning.
2021(01).
Full text in Research Archive
Show summary
CICERO Senter for klimaforskning har på oppdrag fra Miljødirektoratet utviklet og illustrert metodikk for framstilling av klimaeffekt på kort og lang sikt. Vi har vurdert klimaeffekt på to forskjellige måter, med vektfaktorer og med en veldig enkel klimamodell for å estimere temperaturbaner av utslippsbaner og utslippstiltak. Analysen bygger på tidligere arbeid CICERO har gjort for Miljødirektoratet. Mandatet CICERO fikk var analysearbeid på disse fire temaene: 1) Vurdering av behovet for å oppdatere GTP(10)-faktoren Miljødirektoratet i dag benytter. 2) Beregne norske utslipp med GTP(10), AGTP, GWP* og eventuelt andre vektfaktorer for ulike tidshorisonter. 3) Metodikk for framstilling av klimaeffekt på kort og lang sikt av ulike utslipp/utslippsreduksjoner i samme figur. 4) Metodikk for kostnadsberegninger.
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Lund, Marianne Tronstad; Aamaas, Borgar; Berntsen, Terje Koren & Fuglestvedt, Jan S.
(2016).
Luftfart og klima - En oppdatert oversikt over status for forskning på klimaeffekter av utslipp fra fly.
CICERO senter for klimaforskning.
2016(05).
Show summary
Denne rapporten gir en oppdatert oversikt over hvordan og i hvilken grad de ulike utslippene fra flytrafikk påvirker klima basert på den nyeste forskningen. For å forstå den totale klimaeffekten av luftfart er det viktig å inkludere alle mekanismene som bidrar til klimapåvirkning, samt hvordan disse kan vektes og sammenlignes på tvers av ulike skalaer i tid og rom. Dette er hovedfokus i denne rapporten. Rapporten er en oppdatering av Lund m.fl. (2011) og fokuserer på forskningsresultater siden da. Arbeidet er finansiert av Avinor
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Aalstad, Kristoffer & Berntsen, Terje Koren
(2015).
Applying the Eddy Covariance Method Under
Difficult Conditions.
Universitetet i Oslo.
Show summary
We assess how reliable the Eddy-Covariance (EC) method is in estimating surface fluxes under the difficult conditions that occur in the high Arctic. Emphasis is placed on stable stratification and the breakdown of EC assumptions that may occur in such a regime.
To investigate these difficulties we developed an EC processing module from scratch, providing an extensive and transparent overview of the EC method. Raw data was obtained from an open path EC system located in the Bayelva catchment near Ny Ålesund (79 ◦ N), Svalbard, Norway.
Our flux estimates are in reasonable agreement with those found from the standardized EC package TK2. Strong relative non-stationarity represents the greatest hindrance to data quality at Bayelva, occurring for 11% of the data period. Overall, average relative flux uncertainties were found to be 20% for both the sensible (SH) and latent heat (LH) flux. Under stable stratification these uncertainties were considerably higher, 27% on average. Through Ogive classification we found that the traditional 30 minute SH and LH fluxes converged (resolved the turbulent cospectrum) 70% of the time. Here too the stable regime stands out, with low convergence fractions of 41% and 48% for LH and SH, respectively. To our knowledge it is the first time such an analysis has been carried out in the Arctic.
Concluding, while usually successful for neutral and unstable conditions, the traditional 30 minute flux averaging period is, more often than not, poorly suited for the stable regime. We attribute this to the observed and predicted shift in cospectral peaks towards lower periods under stable stratification, along with an erosion of the cospectral gap. An apparently simple fix of reducing the averaging period is not generally a valid solution. The required reduction could introduce unacceptable levels of flux uncertainty.