Atmospheric conditions during the Arctic Clouds in Summer Experiment (ACSE): Contrasting open-water and sea-ice surfaces during melt and freeze-up seasons

Sotiropoulou, Georgia; Tjernström, Michael; Sedlar, Joseph; Achtert, Peggy; Brooks, Barbara J.; Brooks, Ian M.; Persson, P. Ola G.; Prytherch, John; Salisbury, Dominic J.; Shupe, Matthew D.; Johnston, Paul E.; Wolfe, Dan

doi:10.1175/JCLI-D-16-0211.1

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Atmospheric conditions during the Arctic Clouds in Summer Experiment (ACSE): Contrasting open-water and sea-ice surfaces during melt and freeze-up seasons

2016
By Sotiropoulou, Georgia ; Tjernström, Michael ; Sedlar, Joseph ; ...
Source: J. Climate

[PDF-3.16 MB]

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Journal Title:

Journal of Climate
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Sotiropoulou, Georgia ; Tjernström, Michael ; Sedlar, Joseph ; Achtert, Peggy ; Brooks, Barbara J. ; ... More +

Sotiropoulou, Georgia ; Tjernström, Michael ; Sedlar, Joseph ; Achtert, Peggy ; Brooks, Barbara J. ; Brooks, Ian M. ; Persson, P. Ola G. ; Prytherch, John ; Salisbury, Dominic J. ; Shupe, Matthew D. ; Johnston, Paul E. ; Wolfe, Dan Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; PSL (Physical Sciences Laboratory) ; ESRL (Earth System Research Laboratory)

OAR (Oceanic and Atmospheric Research) ; PSL (Physical Sciences Laboratory) ; ESRL (Earth System Research Laboratory) Less -
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The Arctic Clouds in Summer Experiment (ACSE) was conducted during summer and early autumn 2014, providing a detailed view of the seasonal transition from ice melt into freeze-up. Measurements were taken over both ice-free and ice-covered surfaces, near the ice edge, offering insight to the role of the surface state in shaping the atmospheric conditions. The initiation of the autumn freeze-up was related to a change in air mass, rather than to changes in solar radiation alone; the lower atmosphere cooled abruptly leading to a surface heat loss. During melt season, strong surface inversions persisted over the ice, while elevated inversions were more frequent over open water. These differences disappeared during autumn freeze-up, when elevated inversions persisted over both ice-free and ice-covered conditions. These results are in contrast to previous studies that found a well-mixed boundary layer persisting in summer and an increased frequency of surface-based inversions in autumn, suggesting that our knowledge derived from measurements taken within the pan-Arctic area and on the central ice-pack does not necessarily apply closer to the ice-edge. This study offers an insight to the atmospheric processes that occur during a crucial period of the year; understanding and accurately modeling these processes is essential for the improvement of ice-extent predictions and future Arctic climate projections.
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J. Climate
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https://doi.org/10.1175/JCLI-D-16-0211.1
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