Observations of Nonlinear Internal Waves and Atmospheric Surface Layer Interaction
Ortiz-Suslow, David G.
Kalogiros, John A.
Paolo, Tony de
Shearman, Robert Kipp
MetadataShow full item record
Nonlinear internal waves are readily observable in coastal waters, where flow over changing bathymetry may displace the isopycnal surfaces. These internal waves (IWs) may travel long distances, enhancing currents and turbulence within the upper ocean mixed layer. At the surface, IW fronts express as alternating smooth/rough water, creating transient heterogeneity that may disrupt the ambient gradients within the marine atmospheric surface layer (MASL) and hence the properties of the evaporation duct (ED). While the oceanic properties of IWs has been studied, their potential influence on the MASL remains largely unknown. Recently, the R/P FLIP was deployed for the Coupled Air-Sea Processes and Electromagnetic ducting Research (CASPER) program, an air-sea interaction study that took place offshore of Pt. Mugu, CA. As part of this effort, a meteorological mast with overlapping bulk and flux profiles for momentum, temperature, and water vapor was installed on FLIP, sampling the air column from 3 to 16 m above the surface. Using these data as well as high-resolution imagery of IW fronts propagating past FLIP, a study was conducted to determine the impact IWs have on MASL variability. The imagery of the IW bands was critical to enable tracking these features and directly relating measured variability to the presence of IWs. Preliminary findings suggest that the surface roughness variability associated with these IW fronts substantially affects the air-sea momentum flux. Strong flux divergence was found at the leading and trailing edges of each individual band, in some cases this divergence caused a sign reversal (i.e. upward momentum flux). This variability appeared to be trapped with individual bands, suggesting an impact on the MASL that may be distributed across the entire propagation range of a single IW front. Early analysis has not found a clear link between IW fronts and heat flux variability or divergence. However, these bands are visible at low winds and the observation of enhanced turbulence at their edges may impact the vertical scalar gradients (i.e. temperature and water vapor) and ultimately the predictability of the ED height. The results from this investigation, combining the measurements from the mast with observations from a co-located X-Band Marine Radar and a 40-m long thermistor chain, will be presented.
AGU Fall Meeting 2018
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
Ortiz-Suslow, David G.; Kalogiros, John A.; Alappattu, Denny; Welch, Pat; Savelyev, Ivan B.; Paolo, Tony de; Wang, Qing; Yamaguchi, Ryan; Olson, Alex; Shearman, Robert Kipp; Celona, Sean; Terrill, Eric (AGU, 2020-02-18);Nonlinear internal ocean waves (NIWs) are regular features of the coastal ocean, where the hydrodynamic flow over changing bathymetry perturbs the isopycnal surfaces generating these high frequency waves. At the air-sea ...
Ortiz-Suslow, David G.; Wang, Qing; Kalogiros, John; Yamaguchi, Ryan; de Paolo, Tony; Terrill, Eric; Shearman, R. Kipp; Welch, Pat; Savelyev, Ivan (AGU, 2019-08);The heterogeneity in surface roughness caused by transient, nonlinear internal ocean waves is readily observed in coastal waters. However, the quantifiable impact this heterogeneity has on the marine atmospheric surface ...
Martinez, Anthony A. (Monterey, California. Naval Postgraduate School, 1991-12);An eastern Pacific Ocean survey was conducted 7-10 May 1991 along the California coast to determine temporal and spatial variability in refractive conditions. Refractive profiles obtained from high frequency radiosonde ...