hawaiian lee countercurrent
Recently Published Documents


TOTAL DOCUMENTS

13
(FIVE YEARS 1)

H-INDEX

9
(FIVE YEARS 0)

2013 ◽  
Vol 43 (10) ◽  
pp. 2071-2094 ◽  
Author(s):  
Ali Belmadani ◽  
Nikolai A. Maximenko ◽  
Julian P. Mccreary ◽  
Ryo Furue ◽  
Oleg V. Melnichenko ◽  
...  

Abstract Two numerical ocean models are used to study the baroclinic response to forcing by localized wind stress curl (i.e., a wind-forced β plume, which is a circulation cell developing to the west of the source region and composed of a set of zonal jets) with implications for the Hawaiian Lee Countercurrent (HLCC): an idealized primitive equation model [Regional Ocean Modeling System (ROMS)], and a global, eddy-resolving, general circulation model [Ocean General Circulation Model for the Earth Simulator (OFES)]. In addition, theoretical ideas inferred from a linear continuously stratified model are used to interpret results. In ROMS, vertical mixing preferentially damps higher-order vertical modes. The damping thickens the plume to the west of the forcing region, weakening the near-surface zonal jets and generating deeper zonal currents. The zonal damping scale increases monotonically with the meridional forcing scale, indicating a dominant role of vertical viscosity over diffusion, a consequence of the small forcing scale. In the OFES run forced by NCEP reanalysis winds, the HLCC has a vertical structure consistent with that of idealized β plumes simulated by ROMS, once the contribution of the North Equatorial Current (NEC) has been removed. Without this filtering, a deep HLCC branch appears artificially separated from the surface branch by the large-scale intermediate-depth NEC. The surface HLCC in two different OFES runs exhibits sensitivity to the meridional wind curl scale that agrees with the dynamics of a β plume in the presence of vertical viscosity. The existence of a deep HLCC extension is also suggested by velocities of Argo floats.


2013 ◽  
Vol 26 (18) ◽  
pp. 7267-7279 ◽  
Author(s):  
Hideharu Sasaki ◽  
Bunmei Taguchi ◽  
Nobumasa Komori ◽  
Yukio Masumoto

Abstract Local air–sea interactions over the high sea surface temperature (SST) band along the Hawaiian Lee Countercurrent (HLCC) are examined with a focus on dynamical feedback of SST-induced wind stress to the ocean using the atmosphere–ocean coupled general circulation model (CGCM). A pair of ensemble CGCM simulations are compared to extract the air–sea interactions associated with HLCC: the control simulations and other simulations, the latter purposely eliminating influences of the high SST band on the sea surface flux computations in the CGCM. The comparison reveals that oceanic response to surface wind convergence and positive wind stress curl induced by the high SST band increases (decreases) the HLCC speed in the southern (northern) flank of the HLCC. The HLCC speed changes are driven by the Ekman suction associated with positive wind stress curl over the warm HLCC via the thermal wind balance. The HLCC speed increase is more significant than its decrease. This dynamical feedback is likely to be important to sustain the extension of the HLCC far to the west. The heat budget analysis confirms that advection of warm water from the west associated with this significant current speed increase plays a role in the southward shift of the HLCC axis. The dynamical feedback with the HLCC speed increase can potentially amplify the seasonal and interannual variations of HLCC.


Oceanography ◽  
2013 ◽  
Vol 26 (1) ◽  
pp. 58-65 ◽  
Author(s):  
Rick Lumpkin ◽  
Pierre Flamant

2013 ◽  
Vol 69 (2) ◽  
pp. 191-202 ◽  
Author(s):  
Hiroto Abe ◽  
Kimio Hanawa ◽  
Naoto Ebuchi

2011 ◽  
Vol 68 (1) ◽  
pp. 93-111 ◽  
Author(s):  
Hideharu Sasaki ◽  
Shang-Ping Xie ◽  
Bunmei Taguchi ◽  
Masami Nonaka ◽  
Shigeki Hosoda ◽  
...  

Author(s):  
Hideharu Sasaki ◽  
Shang-Ping Xie ◽  
Bunmei Taguchi ◽  
Masami Nonaka ◽  
Shigeki Hosoda ◽  
...  

2010 ◽  
Vol 60 (3) ◽  
pp. 705-715 ◽  
Author(s):  
Hideharu Sasaki ◽  
Shang-Ping Xie ◽  
Bunmei Taguchi ◽  
Masami Nonaka ◽  
Yukio Masumoto

Sign in / Sign up

Export Citation Format

Share Document