The penetrative mixing in the Laptev Sea coastal polynya pycnocline layer
The large recurrent areas of open water and/or thin ice (polynyas) producing cold brine-enriched waters off the fast-ice edge are evident in the Laptev Sea in winter time. A number of abrupt positively correlated transitions in temperature and salinity were recorded in the bottom and intermediate la...
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ftawi:oai:epic.awi.de:34097 2023-05-15T17:07:15+02:00 The penetrative mixing in the Laptev Sea coastal polynya pycnocline layer Kirillov, S. A. Dmitrenko, Igor Hölemann, Jens Kassens, Heidemarie Bloshkina, E. 2013-07-05 application/pdf https://epic.awi.de/id/eprint/34097/ https://epic.awi.de/id/eprint/34097/2/Kirillov_et_al_2013.pdf https://hdl.handle.net/10013/epic.42392 https://hdl.handle.net/10013/epic.42392.d002 unknown https://epic.awi.de/id/eprint/34097/2/Kirillov_et_al_2013.pdf https://hdl.handle.net/10013/epic.42392.d002 Kirillov, S. A. , Dmitrenko, I. , Hölemann, J. orcid:0000-0001-5102-4086 , Kassens, H. and Bloshkina, E. (2013) The penetrative mixing in the Laptev Sea coastal polynya pycnocline layer , Continental Shelf Research, 63 , pp. 34-42 . doi:10.1016/j.csr.2013.04.040 <https://doi.org/10.1016/j.csr.2013.04.040> , hdl:10013/epic.42392 EPIC3Continental Shelf Research, 63, pp. 34-42 Article isiRev 2013 ftawi https://doi.org/10.1016/j.csr.2013.04.040 2021-12-24T15:39:01Z The large recurrent areas of open water and/or thin ice (polynyas) producing cold brine-enriched waters off the fast-ice edge are evident in the Laptev Sea in winter time. A number of abrupt positively correlated transitions in temperature and salinity were recorded in the bottom and intermediate layers at a mooring station in the West New Siberian (WNS) polynya in February-March 2008. Being in the range of ~0.5. °C and ~1.6. psu these changes are induced by horizontal motions across the polynya and correspond to temperature and salinity horizontal gradients in the range of 0.3-1.0. °C/10. km and 1.4-3.5. psu/10. km, respectively. The events of distinct freshening and temperature decrease coincide with a northward current off the fast-ice edge, while southward currents brought saltier and warmer waters at intermediate depths. We suggest that the observed transitions are connected to altering pycnocline depths across the polynya. The source of relatively fresher waters at the intermediate depths in polynya is supposed to originate from penetrative mixing of surface low salinity waters to intermediate water depth. Several forcing processes that could be responsible for a penetrative mixing through the density interface in polynya are discussed. These are penetrative convection and shear-driven mixing that originates from two-layer water dynamics and/or baroclinic tidal motions. The heavily ridged seaward fast-ice edge could produce an additional source of turbulent mixing even through a shear-free density interface due to the increased roughness at the ice-water interface. Article in Journal/Newspaper laptev Laptev Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Laptev Sea Continental Shelf Research 63 34 42 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The large recurrent areas of open water and/or thin ice (polynyas) producing cold brine-enriched waters off the fast-ice edge are evident in the Laptev Sea in winter time. A number of abrupt positively correlated transitions in temperature and salinity were recorded in the bottom and intermediate layers at a mooring station in the West New Siberian (WNS) polynya in February-March 2008. Being in the range of ~0.5. °C and ~1.6. psu these changes are induced by horizontal motions across the polynya and correspond to temperature and salinity horizontal gradients in the range of 0.3-1.0. °C/10. km and 1.4-3.5. psu/10. km, respectively. The events of distinct freshening and temperature decrease coincide with a northward current off the fast-ice edge, while southward currents brought saltier and warmer waters at intermediate depths. We suggest that the observed transitions are connected to altering pycnocline depths across the polynya. The source of relatively fresher waters at the intermediate depths in polynya is supposed to originate from penetrative mixing of surface low salinity waters to intermediate water depth. Several forcing processes that could be responsible for a penetrative mixing through the density interface in polynya are discussed. These are penetrative convection and shear-driven mixing that originates from two-layer water dynamics and/or baroclinic tidal motions. The heavily ridged seaward fast-ice edge could produce an additional source of turbulent mixing even through a shear-free density interface due to the increased roughness at the ice-water interface. |
format |
Article in Journal/Newspaper |
author |
Kirillov, S. A. Dmitrenko, Igor Hölemann, Jens Kassens, Heidemarie Bloshkina, E. |
spellingShingle |
Kirillov, S. A. Dmitrenko, Igor Hölemann, Jens Kassens, Heidemarie Bloshkina, E. The penetrative mixing in the Laptev Sea coastal polynya pycnocline layer |
author_facet |
Kirillov, S. A. Dmitrenko, Igor Hölemann, Jens Kassens, Heidemarie Bloshkina, E. |
author_sort |
Kirillov, S. A. |
title |
The penetrative mixing in the Laptev Sea coastal polynya pycnocline layer |
title_short |
The penetrative mixing in the Laptev Sea coastal polynya pycnocline layer |
title_full |
The penetrative mixing in the Laptev Sea coastal polynya pycnocline layer |
title_fullStr |
The penetrative mixing in the Laptev Sea coastal polynya pycnocline layer |
title_full_unstemmed |
The penetrative mixing in the Laptev Sea coastal polynya pycnocline layer |
title_sort |
penetrative mixing in the laptev sea coastal polynya pycnocline layer |
publishDate |
2013 |
url |
https://epic.awi.de/id/eprint/34097/ https://epic.awi.de/id/eprint/34097/2/Kirillov_et_al_2013.pdf https://hdl.handle.net/10013/epic.42392 https://hdl.handle.net/10013/epic.42392.d002 |
geographic |
Laptev Sea |
geographic_facet |
Laptev Sea |
genre |
laptev Laptev Sea |
genre_facet |
laptev Laptev Sea |
op_source |
EPIC3Continental Shelf Research, 63, pp. 34-42 |
op_relation |
https://epic.awi.de/id/eprint/34097/2/Kirillov_et_al_2013.pdf https://hdl.handle.net/10013/epic.42392.d002 Kirillov, S. A. , Dmitrenko, I. , Hölemann, J. orcid:0000-0001-5102-4086 , Kassens, H. and Bloshkina, E. (2013) The penetrative mixing in the Laptev Sea coastal polynya pycnocline layer , Continental Shelf Research, 63 , pp. 34-42 . doi:10.1016/j.csr.2013.04.040 <https://doi.org/10.1016/j.csr.2013.04.040> , hdl:10013/epic.42392 |
op_doi |
https://doi.org/10.1016/j.csr.2013.04.040 |
container_title |
Continental Shelf Research |
container_volume |
63 |
container_start_page |
34 |
op_container_end_page |
42 |
_version_ |
1766062612748959744 |