North Pacific Acoustic Laboratory: Analysis of Shadow Zone Arrivals and Acoustic Propagation in Numerical Ocean Models

2009 ◽  
Author(s):  
Brian Dushaw
Keyword(s):  
North Pacific ◽  
Acoustic Propagation ◽  
Laboratory Analysis ◽  
Shadow Zone ◽  
Ocean Models

North Pacific Acoustic Laboratory: Deep Water Acoustic Propagation in the Philippine Sea

2012 ◽  
Author(s):  
Peter F. Worcester ◽  
Bruce D. Cornelle ◽  
Matthew A. Dzieciuch ◽  
Walter H. Munk
Keyword(s):  
Deep Water ◽  
North Pacific ◽  
Acoustic Propagation ◽  
Philippine Sea

North Pacific Acoustic Laboratory: Deep Water Acoustic Propagation in the Philippine Sea

2013 ◽  
Author(s):  
Peter F. Worcester ◽  
Bruce D. Cornuelle ◽  
Matthew A. Dzieciuch ◽  
Water H. Munk
Keyword(s):  
Deep Water ◽  
North Pacific ◽  
Acoustic Propagation ◽  
Philippine Sea

scholarly journals Diffusion controls the ventilation of a Pacific Shadow Zone above abyssal overturning

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Mark Holzer ◽  
Tim DeVries ◽  
Casimir de Lavergne
Keyword(s):  
Southern Ocean ◽  
Carbon Storage ◽  
North Atlantic ◽  
North Pacific ◽  
The Other ◽  
Shadow Zone ◽  
Surface Ocean ◽  
Pacific Waters ◽  
The Pacific ◽  
Bottom Waters

AbstractMid-depth North Pacific waters are rich in nutrients and respired carbon accumulated over centuries. The rates and pathways with which these waters exchange with the surface ocean are uncertain, with divergent paradigms of the Pacific overturning: one envisions bottom waters upwelling to 1.5 km depth; the other confines overturning beneath a mid-depth Pacific shadow zone (PSZ) shielded from mean advection. Here global inverse modelling reveals a PSZ where mean ages exceed 1400 years with overturning beneath. The PSZ is supplied primarily by Antarctic and North-Atlantic ventilated waters diffusing from below and from the south. Half of PSZ waters re-surface in the Southern Ocean, a quarter in the subarctic Pacific. The abyssal North Pacific, despite strong overturning, has mean re-surfacing times also exceeding 1400 years because of diffusion into the overlying PSZ. These results imply that diffusive transports – distinct from overturning transports – are a leading control on Pacific nutrient and carbon storage.

scholarly journals How the Ocean’s “Shadow Zone” Breathes

Eos ◽  
2019 ◽  
Vol 100 ◽  
Author(s):  
Emily Underwood
Keyword(s):  
Ocean Circulation ◽  
North Pacific ◽  
Circulation Model ◽  
Shadow Zone ◽  
Ocean Circulation Model ◽  
Argo Floats

A new study uses Argo floats and an ocean circulation model to track the sources supplying pulses of oxygen to the deep North Pacific.

Water Masses in the Pacific in CCSM3

2008 ◽  
Vol 21 (17) ◽  
pp. 4514-4528 ◽  
Author(s):  
Lu Anne Thompson ◽  
Wei Cheng
Keyword(s):  
North Pacific ◽  
Coupled Model ◽  
Ocean Model ◽  
Water Masses ◽  
Convergence Zone ◽  
Intermediate Water ◽  
Atmospheric Component ◽  
The North ◽  
Ocean Models ◽  
The North Pacific

Abstract An examination of model water masses in the North Pacific Ocean is performed in the Community Climate System version 3 (CCSM3) and its ocean-only counterpart. While the surface properties of the ocean are well represented in both simulations, biases in thermocline and intermediate-water masses exist that point to errors in both ocean model physics and the atmospheric component of the coupled model. The lack of North Pacific Intermediate Water (NPIW) in both simulations as well as the overexpression of a too-fresh Antarctic Intermediate Water (AAIW) is indicative of ocean model deficiencies. These properties reflect the difficulty of low-resolution ocean models to represent processes that control deep-water formation both in the Southern Ocean and in the Okhotsk Sea. In addition, as is typical of low-resolution ocean models, errors in the position of the Kuroshio, the North Pacific subtropical gyre western boundary current (WBC), impact the formation of the water masses that form the bulk of the thermocline as well as the properties of the NPIW. Biases that arise only in the coupled simulation include too-salty surface water in the subtropical North Pacific and too deep a thermocline, the source of which is the too-strong westerlies at midlatitudes. Biases in the location of the intertropical convergence zone (ITCZ) and the southern Pacific convergence zone (SPCZ) lead to the opposite hemispheric asymmetry in water mass structure when compared to observations. The atmospheric component of the coupled model acts to compound most ocean model biases.

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