Vertical mixing in the Arctic Ocean inferred from eXpendable Current Profilers
Recent and historical data sets from different regions of the Arctic Ocean are analysed using velocity profiles from 127 eXpendable Current Profiler (XCP) deployments from the time period 1993 to 2010. The data sets are processed identically. The shear profiles of horizontal velocity are used to inf...
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ftunivbergen:oai:bora.uib.no:1956/5132 2023-05-15T14:51:12+02:00 Vertical mixing in the Arctic Ocean inferred from eXpendable Current Profilers Meyer, Anja Kristiansen 2011-05-31 7940320 bytes application/pdf https://hdl.handle.net/1956/5132 eng eng The University of Bergen https://hdl.handle.net/1956/5132 Vertical mixing Physical oceanography eXpendable Current Profilers Arctic ocean 756213 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 Master thesis 2011 ftunivbergen 2023-03-14T17:43:40Z Recent and historical data sets from different regions of the Arctic Ocean are analysed using velocity profiles from 127 eXpendable Current Profiler (XCP) deployments from the time period 1993 to 2010. The data sets are processed identically. The shear profiles of horizontal velocity are used to infer vertical mixing. Using the fine-scale parameterization which relate internal wave energy to energy dissipation rate, the diapycnal eddy diffusivity is inferred. An improved version of the fine-scale parameterization which includes corrections for the shear-strain ratio and variation in latitude is also employed. Joint microstructure measurements made it possible to compare the XCP derived eddy diffusivity with direct observations to test the applicability of the parameterization. It is concluded that the skill of the XCP derived eddy diffusivity in the Arctic Ocean is within a factor of 5-6. Using XCP deployments done at the same time and same location the accuracy of the eddy diffusivity calculation is estimated to be within one order of magnitude. The eddy diffusivity values are compared in relation to topographic variations and temporal variability. For the deeper layers of the ocean, the eddy diffusivity values averaged for slope and ridge areas are comparable, and a factor of two higher than those for the abyss. The analysis on the temporal variability was inconclusive due to relatively poor quality data set from 1993. Master i Meteorologi og oseanografi MAMN-GEOF GEOF399 Master Thesis Arctic Arctic Ocean University of Bergen: Bergen Open Research Archive (BORA-UiB) Arctic Arctic Ocean |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
Vertical mixing Physical oceanography eXpendable Current Profilers Arctic ocean 756213 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 |
spellingShingle |
Vertical mixing Physical oceanography eXpendable Current Profilers Arctic ocean 756213 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 Meyer, Anja Kristiansen Vertical mixing in the Arctic Ocean inferred from eXpendable Current Profilers |
topic_facet |
Vertical mixing Physical oceanography eXpendable Current Profilers Arctic ocean 756213 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 |
description |
Recent and historical data sets from different regions of the Arctic Ocean are analysed using velocity profiles from 127 eXpendable Current Profiler (XCP) deployments from the time period 1993 to 2010. The data sets are processed identically. The shear profiles of horizontal velocity are used to infer vertical mixing. Using the fine-scale parameterization which relate internal wave energy to energy dissipation rate, the diapycnal eddy diffusivity is inferred. An improved version of the fine-scale parameterization which includes corrections for the shear-strain ratio and variation in latitude is also employed. Joint microstructure measurements made it possible to compare the XCP derived eddy diffusivity with direct observations to test the applicability of the parameterization. It is concluded that the skill of the XCP derived eddy diffusivity in the Arctic Ocean is within a factor of 5-6. Using XCP deployments done at the same time and same location the accuracy of the eddy diffusivity calculation is estimated to be within one order of magnitude. The eddy diffusivity values are compared in relation to topographic variations and temporal variability. For the deeper layers of the ocean, the eddy diffusivity values averaged for slope and ridge areas are comparable, and a factor of two higher than those for the abyss. The analysis on the temporal variability was inconclusive due to relatively poor quality data set from 1993. Master i Meteorologi og oseanografi MAMN-GEOF GEOF399 |
format |
Master Thesis |
author |
Meyer, Anja Kristiansen |
author_facet |
Meyer, Anja Kristiansen |
author_sort |
Meyer, Anja Kristiansen |
title |
Vertical mixing in the Arctic Ocean inferred from eXpendable Current Profilers |
title_short |
Vertical mixing in the Arctic Ocean inferred from eXpendable Current Profilers |
title_full |
Vertical mixing in the Arctic Ocean inferred from eXpendable Current Profilers |
title_fullStr |
Vertical mixing in the Arctic Ocean inferred from eXpendable Current Profilers |
title_full_unstemmed |
Vertical mixing in the Arctic Ocean inferred from eXpendable Current Profilers |
title_sort |
vertical mixing in the arctic ocean inferred from expendable current profilers |
publisher |
The University of Bergen |
publishDate |
2011 |
url |
https://hdl.handle.net/1956/5132 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Ocean |
op_relation |
https://hdl.handle.net/1956/5132 |
_version_ |
1766322252401344512 |