Enhanced Turbulence and Energy Dissipation at Ocean Fronts

被引：391

作者：

D'Asaro, Eric ^{[1
,2
]}

Lee, Craig ^{[1
,2
]}

Rainville, Luc ^{[1
,2
]}

Harcourt, Ramsey ^{[1
]}

Thomas, Leif ^{[3
]}

机构：

[1] Univ Washington, Appl Phys Lab, Seattle, WA 98105 USA

[2] Univ Washington, Sch Oceanog, Seattle, WA 98105 USA

[3] Stanford Univ, Dept Environm Earth Syst Sci, Stanford, CA 94305 USA

来源：

SCIENCE | 2011年 / 332卷 / 6027期

基金：

美国国家科学基金会;

关键词：

VERTICAL KINETIC-ENERGY; DEEP CONVECTION; LABRADOR SEA; MIXED-LAYER; WIND; PROPAGATION; VORTICITY; VELOCITY;

D O I：

10.1126/science.1201515

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The ocean surface boundary layer mediates air-sea exchange. In the classical paradigm and in current climate models, its turbulence is driven by atmospheric forcing. Observations at a 1-kilometer-wide front within the Kuroshio Current indicate that the rate of energy dissipation within the boundary layer is enhanced by one to two orders of magnitude, suggesting that the front, rather than the atmospheric forcing, supplied the energy for the turbulence. The data quantitatively support the hypothesis that winds aligned with the frontal velocity catalyzed a release of energy from the front to the turbulence. The resulting boundary layer is stratified in contrast to the classically well-mixed layer. These effects will be strongest at the intense fronts found in the Kuroshio Current, the Gulf Stream, and the Antarctic Circumpolar Current, all of which are key players in the climate system.

引用

页码：318 / 322

页数：5