Monitoring the Norwegian Atlantic slope current using a single moored current meter
Monitoring the Atlantic inflow (AI) of warm and saline water into the Nordic Seas (Norwegian, Greenland and Iceland Seas) is of great importance becauce of its impact on climate and ecology in Northern Europe and Arctic. In this study, an observation system for establishment of simple, robust and co...
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Online Access: | https://hdl.handle.net/1956/427 https://doi.org/10.1016/s0278-4343(02)00172-3 |
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ftunivbergen:oai:bora.uib.no:1956/427 2023-05-15T15:18:17+02:00 Monitoring the Norwegian Atlantic slope current using a single moored current meter Orvik, Kjell Arild Skagseth, Øystein 2003-01 46624 bytes 137 bytes 786019 bytes text/plain application/pdf https://hdl.handle.net/1956/427 https://doi.org/10.1016/s0278-4343(02)00172-3 eng eng Elsevier urn:issn:0278-4343 https://hdl.handle.net/1956/427 https://doi.org/10.1016/s0278-4343(02)00172-3 Elsevier Science Ltd. Atlantic inflow Norwegian atlantic slope current Volume transport Moored current records Monitoring Linear regression model Peer reviewed Journal article 2003 ftunivbergen https://doi.org/10.1016/s0278-4343(02)00172-3 2023-03-14T17:42:58Z Monitoring the Atlantic inflow (AI) of warm and saline water into the Nordic Seas (Norwegian, Greenland and Iceland Seas) is of great importance becauce of its impact on climate and ecology in Northern Europe and Arctic. In this study, an observation system for establishment of simple, robust and cost effective monitoring of the AI is validated in the Svinøy section, cutting through the AI just to the north of the Faroe-Shetland Channel. We concentrate on the eastern branch of the AI, the Norwegian Atlantic Slope Current (NwASC), an about 40km wide flow along the steep Norwegian slope. The database is an array of 15 current meters on 4 moorings covering the NwASC over a 2-year period 1998–2000. We test the hypothesis that long-term monitoring of the NwASC can be performed by using one single current meter suitable placed in the flow. The volume flux can then be estimated by construction of simple regression models using the single current meter record as the independent variable. For validation of statistical properties as stability, confidence and stationarity, the time series is split into two 1-year segments: a model period and a test period. Gridded correlation fields between currents and volume transport show correlation maxima in the core of the NwASC, ranging from 0.84 on a daily timescale to 0.97 on a monthly timescale. A more comprehensive correlation/ coherence analysis for each current meter record against volume transport on 7-day timescales, enable us to choose the optimal current meter for a linear regression model with (correlation, slope) coefficients of (0.87, 0.13) for the model period and (0.80, 0.13) for the test period. The similarity of the statistical properties for the model and test periods substantiates the stationarity, stability and robustness of the model. A linear regression model underestimates large fluxes and is thus extended to a second degree polynomia. This improves the curve fitting for strong currents with a minor increase in overall correlation, but is more sensistive and ... Article in Journal/Newspaper Arctic Greenland Iceland Nordic Seas University of Bergen: Bergen Open Research Archive (BORA-UiB) Arctic Greenland Svinøy ENVELOPE(10.992,10.992,64.866,64.866) Continental Shelf Research 23 2 159 176 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
Atlantic inflow Norwegian atlantic slope current Volume transport Moored current records Monitoring Linear regression model |
spellingShingle |
Atlantic inflow Norwegian atlantic slope current Volume transport Moored current records Monitoring Linear regression model Orvik, Kjell Arild Skagseth, Øystein Monitoring the Norwegian Atlantic slope current using a single moored current meter |
topic_facet |
Atlantic inflow Norwegian atlantic slope current Volume transport Moored current records Monitoring Linear regression model |
description |
Monitoring the Atlantic inflow (AI) of warm and saline water into the Nordic Seas (Norwegian, Greenland and Iceland Seas) is of great importance becauce of its impact on climate and ecology in Northern Europe and Arctic. In this study, an observation system for establishment of simple, robust and cost effective monitoring of the AI is validated in the Svinøy section, cutting through the AI just to the north of the Faroe-Shetland Channel. We concentrate on the eastern branch of the AI, the Norwegian Atlantic Slope Current (NwASC), an about 40km wide flow along the steep Norwegian slope. The database is an array of 15 current meters on 4 moorings covering the NwASC over a 2-year period 1998–2000. We test the hypothesis that long-term monitoring of the NwASC can be performed by using one single current meter suitable placed in the flow. The volume flux can then be estimated by construction of simple regression models using the single current meter record as the independent variable. For validation of statistical properties as stability, confidence and stationarity, the time series is split into two 1-year segments: a model period and a test period. Gridded correlation fields between currents and volume transport show correlation maxima in the core of the NwASC, ranging from 0.84 on a daily timescale to 0.97 on a monthly timescale. A more comprehensive correlation/ coherence analysis for each current meter record against volume transport on 7-day timescales, enable us to choose the optimal current meter for a linear regression model with (correlation, slope) coefficients of (0.87, 0.13) for the model period and (0.80, 0.13) for the test period. The similarity of the statistical properties for the model and test periods substantiates the stationarity, stability and robustness of the model. A linear regression model underestimates large fluxes and is thus extended to a second degree polynomia. This improves the curve fitting for strong currents with a minor increase in overall correlation, but is more sensistive and ... |
format |
Article in Journal/Newspaper |
author |
Orvik, Kjell Arild Skagseth, Øystein |
author_facet |
Orvik, Kjell Arild Skagseth, Øystein |
author_sort |
Orvik, Kjell Arild |
title |
Monitoring the Norwegian Atlantic slope current using a single moored current meter |
title_short |
Monitoring the Norwegian Atlantic slope current using a single moored current meter |
title_full |
Monitoring the Norwegian Atlantic slope current using a single moored current meter |
title_fullStr |
Monitoring the Norwegian Atlantic slope current using a single moored current meter |
title_full_unstemmed |
Monitoring the Norwegian Atlantic slope current using a single moored current meter |
title_sort |
monitoring the norwegian atlantic slope current using a single moored current meter |
publisher |
Elsevier |
publishDate |
2003 |
url |
https://hdl.handle.net/1956/427 https://doi.org/10.1016/s0278-4343(02)00172-3 |
long_lat |
ENVELOPE(10.992,10.992,64.866,64.866) |
geographic |
Arctic Greenland Svinøy |
geographic_facet |
Arctic Greenland Svinøy |
genre |
Arctic Greenland Iceland Nordic Seas |
genre_facet |
Arctic Greenland Iceland Nordic Seas |
op_relation |
urn:issn:0278-4343 https://hdl.handle.net/1956/427 https://doi.org/10.1016/s0278-4343(02)00172-3 |
op_rights |
Elsevier Science Ltd. |
op_doi |
https://doi.org/10.1016/s0278-4343(02)00172-3 |
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Continental Shelf Research |
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23 |
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2 |
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159 |
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176 |
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1766348490998284288 |