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פותח על ידי קלירמאש פתרונות בע"מ -
Wind work at the air-sea interface: a modeling study in anticipation of future space missions
Year:
2023
Source of publication :
Geoscientific Model Development
Authors :
שטרובך, אהוד
;
.
Volume :
Co-Authors:

Hector S. Torres
Patrice Klein
Jinbo Wang
Alexander Wineteer
Bo Qiu
Andrew F. Thompson
Ernesto Rodriguez
Dimitris Menemenlis
Andrea Molod
Christopher N. Hill
Hong Zhang
Mar Flexas
Dragana Perkovic-Martin

Facilitators :
From page:
0
To page:
0
(
Total pages:
1
)
Abstract:

Wind work at the air-sea interface is the transfer of kinetic energy between the ocean and the atmosphere and, as such, is an important part of the atmosphere-ocean coupled system. Since wind work involves winds and ocean currents that span a broad range of spatial and temporal scales, a comprehensive study would require access to observations of a wide range of space and time scales. In the absence of appropriate global observations, our study makes use of a new, global, coupled ocean-atmosphere simulation with horizontal grid spacing of 2–5 km for the ocean and 7 km for the atmosphere. Here we develop a methodology, both in physical and spectral space, to diagnose different components of wind work in terms of forcing distinct classes of oceanic motions, including mean currents, time-dependent large-scale currents and mesoscale eddies, and internal gravity waves such as near-inertial waves. The total simulated wind work has a magnitude of 5.21 TW, a value much larger than reported by previous modeling studies. The total wind work is first decomposed into time-mean and time-dependent components, with the former accounting for 2.23 TW (43 %) and the latter 2.98 TW (57 %). The time-dependent wind work is then decomposed into two components, a high-frequency component that forces internal gravity waves and a low-frequency component that forces mesoscale eddies and large-scale currents. The high-frequency component is positive at scales between 10 km and 1000 km and represents 75 % of the total time-dependent component. The low-frequency component is found to be positive for spatial scales larger than 275 km and ten times larger than the negative part associated with smaller spatial scales. The negative wind work acts as a surface drag that slows down surface currents and damps mesoscale eddies whereas the positive low-frequency part accelerates large-scale currents. The complex and consequential interplay of surface winds and currents in the numerical simulation motivates the need for a winds-and-currents satellite mission to directly observe these wind work components.

Note:
Related Files :
air-sea interface
Ocean currents
Wind work
עוד תגיות
תוכן קשור
More details
DOI :
10.5194/egusphere-2022-294
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
62590
Last updated date:
25/01/2023 13:46
Creation date:
04/12/2022 17:44
Scientific Publication
Wind work at the air-sea interface: a modeling study in anticipation of future space missions

Hector S. Torres
Patrice Klein
Jinbo Wang
Alexander Wineteer
Bo Qiu
Andrew F. Thompson
Ernesto Rodriguez
Dimitris Menemenlis
Andrea Molod
Christopher N. Hill
Hong Zhang
Mar Flexas
Dragana Perkovic-Martin

Wind work at the air-sea interface: a modeling study in anticipation of future space missions

Wind work at the air-sea interface is the transfer of kinetic energy between the ocean and the atmosphere and, as such, is an important part of the atmosphere-ocean coupled system. Since wind work involves winds and ocean currents that span a broad range of spatial and temporal scales, a comprehensive study would require access to observations of a wide range of space and time scales. In the absence of appropriate global observations, our study makes use of a new, global, coupled ocean-atmosphere simulation with horizontal grid spacing of 2–5 km for the ocean and 7 km for the atmosphere. Here we develop a methodology, both in physical and spectral space, to diagnose different components of wind work in terms of forcing distinct classes of oceanic motions, including mean currents, time-dependent large-scale currents and mesoscale eddies, and internal gravity waves such as near-inertial waves. The total simulated wind work has a magnitude of 5.21 TW, a value much larger than reported by previous modeling studies. The total wind work is first decomposed into time-mean and time-dependent components, with the former accounting for 2.23 TW (43 %) and the latter 2.98 TW (57 %). The time-dependent wind work is then decomposed into two components, a high-frequency component that forces internal gravity waves and a low-frequency component that forces mesoscale eddies and large-scale currents. The high-frequency component is positive at scales between 10 km and 1000 km and represents 75 % of the total time-dependent component. The low-frequency component is found to be positive for spatial scales larger than 275 km and ten times larger than the negative part associated with smaller spatial scales. The negative wind work acts as a surface drag that slows down surface currents and damps mesoscale eddies whereas the positive low-frequency part accelerates large-scale currents. The complex and consequential interplay of surface winds and currents in the numerical simulation motivates the need for a winds-and-currents satellite mission to directly observe these wind work components.

Scientific Publication
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