The role of roughness and stability on the momentum flux in the Marine Atmospheric Surface Layer: a study on the Southwestern Atlantic Ocean

Publication Date:
2018-03-14
Publisher:
Wiley-Blackwell
Print ISSN:
0148-0227
Topics:
Geosciences
Physics
Published by:
http://www.wiley.com/wiley-blackwell
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autor J. A. Hackerott, L. P. Pezzi, M. Bakhoday Paskyabi, A. P. Oliveira, J. Reuder, R. B. Souza, R. Camargo
beschreibung For the first time, in-situ turbulence measurements collected in the vicinity of the Brazil-Malvinas Confluence are used to determine the influence of the ocean waves and atmospheric stability on the Marine Atmospheric Surface Layer. From the analysis of 187 high-frequency sampled segments of temperature and wind velocity, carefully selected from three ship campaigns of the Air-Sea Interaction at Brazil-Malvinas Confluence (INTERCONF) project, we found a particular behavior of the drag coefficient, with a negative trend for a calm wind speed up to 10 m s −1 when the significant wave height was lower than 2.5 m, and a continuous decrease of the drag coefficient with increasing wind speed for significant wave height higher than 2.5 m. The results suggest that waves act as roughness elements during high wave conditions, inducing a zero-plane displacement in the order of 0.1 to 1 m as an indication for a wave-induced roughness layer. In addition, the analysis of the Turbulent Kinetic Energy (TKE) budget indicates the occurrence of upward TKE transport mainly during stable conditions, while the general patterns of transport and dissipation of TKE are similar to observations taken over land surfaces.
citation_standardnr 6205204
datenlieferant ipn_articles
feed_copyright American Geophysical Union (AGU)
feed_copyright_url http://www.agu.org/
feed_id 7528
feed_publisher Wiley-Blackwell
feed_publisher_url http://www.wiley.com/wiley-blackwell
insertion_date 2018-03-14
journalissn 0148-0227
publikationsjahr_anzeige 2018
publikationsjahr_facette 2018
publikationsjahr_intervall 7984:2015-2019
publikationsjahr_sort 2018
publisher Wiley-Blackwell
quelle Journal of Geophysical Research JGR - Atmospheres
relation http://onlinelibrary.wiley.com/resolve/doi?DOI=10.1002%2F2017JD027994
search_space articles
shingle_author_1 J. A. Hackerott, L. P. Pezzi, M. Bakhoday Paskyabi, A. P. Oliveira, J. Reuder, R. B. Souza, R. Camargo
shingle_author_2 J. A. Hackerott, L. P. Pezzi, M. Bakhoday Paskyabi, A. P. Oliveira, J. Reuder, R. B. Souza, R. Camargo
shingle_author_3 J. A. Hackerott, L. P. Pezzi, M. Bakhoday Paskyabi, A. P. Oliveira, J. Reuder, R. B. Souza, R. Camargo
shingle_author_4 J. A. Hackerott, L. P. Pezzi, M. Bakhoday Paskyabi, A. P. Oliveira, J. Reuder, R. B. Souza, R. Camargo
shingle_catch_all_1 The role of roughness and stability on the momentum flux in the Marine Atmospheric Surface Layer: a study on the Southwestern Atlantic Ocean
For the first time, in-situ turbulence measurements collected in the vicinity of the Brazil-Malvinas Confluence are used to determine the influence of the ocean waves and atmospheric stability on the Marine Atmospheric Surface Layer. From the analysis of 187 high-frequency sampled segments of temperature and wind velocity, carefully selected from three ship campaigns of the Air-Sea Interaction at Brazil-Malvinas Confluence (INTERCONF) project, we found a particular behavior of the drag coefficient, with a negative trend for a calm wind speed up to 10 m s −1 when the significant wave height was lower than 2.5 m, and a continuous decrease of the drag coefficient with increasing wind speed for significant wave height higher than 2.5 m. The results suggest that waves act as roughness elements during high wave conditions, inducing a zero-plane displacement in the order of 0.1 to 1 m as an indication for a wave-induced roughness layer. In addition, the analysis of the Turbulent Kinetic Energy (TKE) budget indicates the occurrence of upward TKE transport mainly during stable conditions, while the general patterns of transport and dissipation of TKE are similar to observations taken over land surfaces.
J. A. Hackerott, L. P. Pezzi, M. Bakhoday Paskyabi, A. P. Oliveira, J. Reuder, R. B. Souza, R. Camargo
Wiley-Blackwell
0148-0227
01480227
shingle_catch_all_2 The role of roughness and stability on the momentum flux in the Marine Atmospheric Surface Layer: a study on the Southwestern Atlantic Ocean
For the first time, in-situ turbulence measurements collected in the vicinity of the Brazil-Malvinas Confluence are used to determine the influence of the ocean waves and atmospheric stability on the Marine Atmospheric Surface Layer. From the analysis of 187 high-frequency sampled segments of temperature and wind velocity, carefully selected from three ship campaigns of the Air-Sea Interaction at Brazil-Malvinas Confluence (INTERCONF) project, we found a particular behavior of the drag coefficient, with a negative trend for a calm wind speed up to 10 m s −1 when the significant wave height was lower than 2.5 m, and a continuous decrease of the drag coefficient with increasing wind speed for significant wave height higher than 2.5 m. The results suggest that waves act as roughness elements during high wave conditions, inducing a zero-plane displacement in the order of 0.1 to 1 m as an indication for a wave-induced roughness layer. In addition, the analysis of the Turbulent Kinetic Energy (TKE) budget indicates the occurrence of upward TKE transport mainly during stable conditions, while the general patterns of transport and dissipation of TKE are similar to observations taken over land surfaces.
J. A. Hackerott, L. P. Pezzi, M. Bakhoday Paskyabi, A. P. Oliveira, J. Reuder, R. B. Souza, R. Camargo
Wiley-Blackwell
0148-0227
01480227
shingle_catch_all_3 The role of roughness and stability on the momentum flux in the Marine Atmospheric Surface Layer: a study on the Southwestern Atlantic Ocean
For the first time, in-situ turbulence measurements collected in the vicinity of the Brazil-Malvinas Confluence are used to determine the influence of the ocean waves and atmospheric stability on the Marine Atmospheric Surface Layer. From the analysis of 187 high-frequency sampled segments of temperature and wind velocity, carefully selected from three ship campaigns of the Air-Sea Interaction at Brazil-Malvinas Confluence (INTERCONF) project, we found a particular behavior of the drag coefficient, with a negative trend for a calm wind speed up to 10 m s −1 when the significant wave height was lower than 2.5 m, and a continuous decrease of the drag coefficient with increasing wind speed for significant wave height higher than 2.5 m. The results suggest that waves act as roughness elements during high wave conditions, inducing a zero-plane displacement in the order of 0.1 to 1 m as an indication for a wave-induced roughness layer. In addition, the analysis of the Turbulent Kinetic Energy (TKE) budget indicates the occurrence of upward TKE transport mainly during stable conditions, while the general patterns of transport and dissipation of TKE are similar to observations taken over land surfaces.
J. A. Hackerott, L. P. Pezzi, M. Bakhoday Paskyabi, A. P. Oliveira, J. Reuder, R. B. Souza, R. Camargo
Wiley-Blackwell
0148-0227
01480227
shingle_catch_all_4 The role of roughness and stability on the momentum flux in the Marine Atmospheric Surface Layer: a study on the Southwestern Atlantic Ocean
For the first time, in-situ turbulence measurements collected in the vicinity of the Brazil-Malvinas Confluence are used to determine the influence of the ocean waves and atmospheric stability on the Marine Atmospheric Surface Layer. From the analysis of 187 high-frequency sampled segments of temperature and wind velocity, carefully selected from three ship campaigns of the Air-Sea Interaction at Brazil-Malvinas Confluence (INTERCONF) project, we found a particular behavior of the drag coefficient, with a negative trend for a calm wind speed up to 10 m s −1 when the significant wave height was lower than 2.5 m, and a continuous decrease of the drag coefficient with increasing wind speed for significant wave height higher than 2.5 m. The results suggest that waves act as roughness elements during high wave conditions, inducing a zero-plane displacement in the order of 0.1 to 1 m as an indication for a wave-induced roughness layer. In addition, the analysis of the Turbulent Kinetic Energy (TKE) budget indicates the occurrence of upward TKE transport mainly during stable conditions, while the general patterns of transport and dissipation of TKE are similar to observations taken over land surfaces.
J. A. Hackerott, L. P. Pezzi, M. Bakhoday Paskyabi, A. P. Oliveira, J. Reuder, R. B. Souza, R. Camargo
Wiley-Blackwell
0148-0227
01480227
shingle_title_1 The role of roughness and stability on the momentum flux in the Marine Atmospheric Surface Layer: a study on the Southwestern Atlantic Ocean
shingle_title_2 The role of roughness and stability on the momentum flux in the Marine Atmospheric Surface Layer: a study on the Southwestern Atlantic Ocean
shingle_title_3 The role of roughness and stability on the momentum flux in the Marine Atmospheric Surface Layer: a study on the Southwestern Atlantic Ocean
shingle_title_4 The role of roughness and stability on the momentum flux in the Marine Atmospheric Surface Layer: a study on the Southwestern Atlantic Ocean
timestamp 2025-06-30T23:33:31.751Z
titel The role of roughness and stability on the momentum flux in the Marine Atmospheric Surface Layer: a study on the Southwestern Atlantic Ocean
titel_suche The role of roughness and stability on the momentum flux in the Marine Atmospheric Surface Layer: a study on the Southwestern Atlantic Ocean
topic TE-TZ
U
uid ipn_articles_6205204