Extreme variability in Irminger Sea winter heat loss Revealed by ocean observatories initiative mooring and the ERA5 Reanalysis
Extreme variability in Irminger Sea winter heat loss Revealed by ocean observatories initiative mooring and the ERA5 Reanalysis
Ground‐breaking measurements from the ocean observatories initiative Irminger Sea surface mooring (60°N, 39°30′W) are presented that provide the first in situ characterization of multiwinter surface heat exchange at a high latitude North Atlantic site. They reveal strong variability (December 2014 net heat loss nearly 50% greater than December 2015) due primarily to variations in frequency of intense short timescale (1–3 days) forcing. Combining the observations with the new high resolution European Centre for Medium Range Weather Forecasts Reanalysis 5 (ERA5) atmospheric reanalysis, the main source of multiwinter variability is shown to be changes in the frequency of Greenland tip jets (present on 15 days in December 2014 and 3 days in December 2015) that can result in hourly mean heat loss exceeding 800 W/m2. Furthermore, a new picture for atmospheric mode influence on Irminger Sea heat loss is developed whereby strongly positive North Atlantic Oscillation conditions favor increased losses only when not outweighed by the East Atlantic Pattern.
293-302
Josey, S. A.
2252ab7f-5cd2-49fd-a951-aece44553d93
De Jong, M. F.
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Oltmanns, M.
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Moore, G. K.
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Weller, R. A.
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16 January 2019
Josey, S. A.
2252ab7f-5cd2-49fd-a951-aece44553d93
De Jong, M. F.
cac6fc64-acd5-4e56-a17a-61770a350a01
Oltmanns, M.
a301aeb1-c2b0-4765-b853-c6bca6e0b013
Moore, G. K.
08fa42a5-b2fc-4280-a476-698b164b163e
Weller, R. A.
27c97c11-3d05-4ac2-88c9-3ceaec7f7d2c
Josey, S. A., De Jong, M. F., Oltmanns, M., Moore, G. K. and Weller, R. A.
(2019)
Extreme variability in Irminger Sea winter heat loss Revealed by ocean observatories initiative mooring and the ERA5 Reanalysis.
Geophysical Research Letters, 46 (1), .
(doi:10.1029/2018GL080956).
Abstract
Ground‐breaking measurements from the ocean observatories initiative Irminger Sea surface mooring (60°N, 39°30′W) are presented that provide the first in situ characterization of multiwinter surface heat exchange at a high latitude North Atlantic site. They reveal strong variability (December 2014 net heat loss nearly 50% greater than December 2015) due primarily to variations in frequency of intense short timescale (1–3 days) forcing. Combining the observations with the new high resolution European Centre for Medium Range Weather Forecasts Reanalysis 5 (ERA5) atmospheric reanalysis, the main source of multiwinter variability is shown to be changes in the frequency of Greenland tip jets (present on 15 days in December 2014 and 3 days in December 2015) that can result in hourly mean heat loss exceeding 800 W/m2. Furthermore, a new picture for atmospheric mode influence on Irminger Sea heat loss is developed whereby strongly positive North Atlantic Oscillation conditions favor increased losses only when not outweighed by the East Atlantic Pattern.
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Accepted/In Press date: 15 December 2018
e-pub ahead of print date: 18 December 2018
Published date: 16 January 2019
Identifiers
Local EPrints ID: 429346
URI: http://eprints.soton.ac.uk/id/eprint/429346
ISSN: 0094-8276
PURE UUID: fdcd8bce-e856-4543-9c81-b20aadd2fb06
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Date deposited: 26 Mar 2019 17:30
Last modified: 16 Mar 2024 00:58
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Author:
S. A. Josey
Author:
M. F. De Jong
Author:
M. Oltmanns
Author:
G. K. Moore
Author:
R. A. Weller
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