Ship-based estimates of momentum transfer coefficient over sea ice and recommendations for its parameterization
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Published:2022-04-12
Issue:7
Volume:22
Page:4763-4778
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Srivastava PiyushORCID, Brooks Ian M.ORCID, Prytherch JohnORCID, Salisbury Dominic J.ORCID, Elvidge Andrew D.ORCID, Renfrew Ian A., Yelland Margaret J.
Abstract
Abstract. A major source of uncertainty in both climate projections and seasonal
forecasting of sea ice is inadequate representation of surface–atmosphere
exchange processes. The observations needed to improve understanding and
reduce uncertainty in surface exchange parameterizations are challenging to
make and rare. Here we present a large dataset of ship-based measurements of
surface momentum exchange (surface drag) in the vicinity of sea ice from the
Arctic Clouds in Summer Experiment (ACSE) in July–October 2014, and the
Arctic Ocean 2016 experiment (AO2016) in August–September 2016. The
combined dataset provides an extensive record of momentum flux over a wide
range of surface conditions spanning the late summer melt and early autumn
freeze-up periods, and a wide range of atmospheric stabilities. Surface
exchange coefficients are estimated from in situ eddy covariance
measurements. The local sea-ice fraction is determined via automated
processing of imagery from ship-mounted cameras. The surface drag
coefficient, CD10n, peaks at local ice fractions of 0.6–0.8, consistent
with both recent aircraft-based observations and theory. Two
state-of-the-art parameterizations have been tuned to our observations, with
both providing excellent fits to the measurements.
Funder
Natural Environment Research Council Polarforskningssekretariatet Knut och Alice Wallenbergs Stiftelse
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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