scholarly journals An evaluation of tropical waves and wave forcing of the QBO in the QBOi models

2020 ◽  
Author(s):  
Laura A. Holt ◽  
François Lott ◽  
Rolando R. Garcia ◽  
George N. Kiladis ◽  
Yuan‐Ming Cheng ◽  
...  
Keyword(s):  
Wave Forcing ◽  
Tropical Waves

scholarly journals Tropical Waves and the Quasi-Biennial Oscillation in a 7-km Global Climate Simulation

2016 ◽  
Vol 73 (9) ◽  
pp. 3771-3783 ◽  
Author(s):  
Laura A. Holt ◽  
M. Joan Alexander ◽  
Lawrence Coy ◽  
Andrea Molod ◽  
William Putman ◽  
...  
Keyword(s):  
General Circulation ◽  
Shear Zones ◽  
Horizontal Resolution ◽  
Small Scale ◽  
Healthy Population ◽  
Quasi Biennial Oscillation ◽  
Wave Forcing ◽  
Tropical Waves ◽  
Biennial Oscillation ◽  
Very High

Abstract This study investigates tropical waves and their role in driving a quasi-biennial oscillation (QBO)-like signal in stratospheric winds in a global 7-km-horizontal-resolution atmospheric general circulation model. The Nature Run (NR) is a 2-yr global mesoscale simulation of the Goddard Earth Observing System Model, version 5 (GEOS-5). In the tropics, there is evidence that the NR supports a broad range of convectively generated waves. The NR precipitation spectrum resembles the observed spectrum in many aspects, including the preference for westward-propagating waves. However, even with very high horizontal resolution and a healthy population of resolved waves, the zonal force provided by the resolved waves is still too low in the QBO region and parameterized gravity wave drag is the main driver of the NR QBO-like oscillation (NR-QBO). The authors suggest that causes include coarse vertical resolution and excessive dissipation. Nevertheless, the very-high-resolution NR provides an opportunity to analyze the resolved wave forcing of the NR-QBO. In agreement with previous studies, large-scale Kelvin and small-scale waves contribute to the NR-QBO driving in eastward shear zones and small-scale waves dominate the NR-QBO driving in westward shear zones. Waves with zonal wavelength < 1000 km account for up to half of the small-scale (<3300 km) resolved wave forcing in eastward shear zones and up to 70% of the small-scale resolved wave forcing in westward shear zones of the NR-QBO.

Ripple Dynamics and Benthic Transformations Under Variable Wave Forcing

2007 ◽  
Author(s):  
Harindra J. Fernando ◽  
Sergey I. Voropayev ◽  
Mark W. Schmeeckle
Keyword(s):  
Wave Forcing

scholarly journals Observations of Tidal Flat Sedimentation within a Native and an Exotic Spartina Species

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1566
Author(s):  
Barbara Proença ◽  
Florian Ganthy ◽  
Richard Michalet ◽  
Aldo Sottolichio
Keyword(s):  
Single Point ◽  
Field Measurements ◽  
Species Variation ◽  
Storm Events ◽  
Level Variation ◽  
Wave Forcing ◽  
Bed Elevation ◽  
Sediment Stabilization ◽  
Consistent Response

Field measurements of bed elevation and related wave events were performed within a tidal marsh, on two cordgrass species, Spartina anglica (exotic) and Spartina maritima (native), in the Bay of Arcachon (SW France). Bed- and water-level time series were used to infer on the sediment behavior patterns from short to long term. A consistent response was found between the bed-level variation and the wave forcing, with erosion occurring during storms and accretion during low energy periods. Such behavior was observed within the two species, but the magnitude of bed-level variation was higher within the native than the exotic Spartina. These differences, in the order of millimeters, were explained by the opposite allocation of biomass of the two species. On the long term, the sedimentation/erosion patterns were dominated by episodic storm events. A general sediment deficit was observed on the site, suggested by an overall bed-level decrease registered within both species. However, further verification of within species variation needs to be considered when drawing conclusions. Despite possible qualitative limitations of the experimental design, due to single point survey, this work provides original and considerable field data to the understanding the different species ability to influence bed sediment stabilization and their potential to build marsh from the mudflat pioneer stage. Such information is valuable for coastal management in the context of global change.

A new model of tropical waves incorporating momentum mixing by cumulus convection

1977 ◽  
Vol 1 (5) ◽  
pp. 365-425 ◽  
Author(s):  
Duane E Stevens ◽  
Richard S Lindzen ◽  
Lloyd J Shapiro
Keyword(s):  
Cumulus Convection ◽  
New Model ◽  
Tropical Waves

Links between wave forcing, offshore islands and a macro-tidal headland-bound bay beach

2013 ◽  
Vol 39 (2) ◽  
pp. 143-155 ◽  
Author(s):  
Tony Thomas ◽  
Michael R. Phillips ◽  
Allan T. Williams ◽  
Rhian E. Jenkins
Keyword(s):  
Wave Forcing
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