Impact of convection on surface fluxes observed during LASP/DYNAMO 2011
Cushanick, Matthew S.
MetadataShow full item record
The NOAA WP-3D aircraft made extensive measurements over the tropical Indian Ocean during the Littoral Air-Sea Processes (LASP)/Dynamics of Madden-Julian Oscillation (DYNAMO) experiment. The low-level measurements from the WP-3D are analyzed here to examine the impact of tropical convection and its associated cold pool in modifying surface exchange of momentum and energy. Analysis of surface fluxes under convection and non-convection demonstrates the increased variability of surface fluxes under convection. Fluxes below convection are larger in magnitude, variable, and demonstrate no clear contribution from specific length scales. The lack of clear transport in the turbulence scales under convection highlights that additional processes beyond turbulence transport are occurring, which points to the role of precipitation evaporation below the cloud base. In contrast, surface fluxes under non-convective conditions are smaller and have a clear positive contribution throughout the turbulence region. Comparison of eddy correlation method with the COARE bulk surface flux parameterization indicates large scattering for the convective cases. Stress and latent heat flux from the COARE algorithm show good comparison with the eddy correlation fluxes, while the sensible heat flux seem to be consistently over-predicted, which may be a result of uncertainties in the measured sea surface temperature.
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.
Persing, J.; Montgomery, M.T.; McWilliams, J.C.; Smith, R.K. (Copernicus Publications, 2013);We present the results of idealized numerical experiments to examine the difference between tropical cyclone evolution in three-dimensional (3-D) and axisymmetric (AX) model configurations. We focus on the prototype ...
Jiminez, Greg M (Monterey, California. Naval Postgraduate School, 1997-03);This study examines diurnal variation of convection over western India, the Bay of Bengal, Indochina and the northern South China Sea during the 1991 northern summer monsoon using combined Japanese (GMS) and Indian (INSAT) ...
Characterizing the effects of convection on the afternoon-to-evening boundary layer transition during PECAN 2015 Eberle, Geoffry R. (Monterey, California. Naval Postgraduate School, 2016-12);The Great Plains exhibits a widely known characteristic transition in the atmospheric boundary layer, from a daytime unstable boundary layer to a nocturnal stable boundary layer near sunset. There remains much to learn ...