Vertical transports by plumes within the moderately convective marine atmospheric surface layer

Richard A. Mason, Hampton N. Shirer, Robert Wells, George Spencer Young

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Bursts in the kinematic vertical transports of heat and horizontal momentum in a moderately convective marine atmospheric surface layer are studied by applying the variable interval time averaging (VITA) detection method to principal components analysis (PCA)-decomposed datasets obtained from the Floating Instrumentation Platform (FLIP) moored vessel during the 1995 April-May Pacific Marine Boundary Layer (PMBL) experiment. For convective plumes, a well-defined dimensionless relationship is shown to exist between the vertical transports of heat and horizontal momentum; this relationship cannot be easily deduced if PCA and VITA are not both applied. PCA decomposes a dataset using correlations within that dataset instead of bandpass filtering it to retain energy in a predetermined range of scales; PCA thus respects all scales contributing to the phenomena retained in the dataset. Subsequent use of cross-spectral techniques to group the PCA-decomposed dataset into coherent structure types leads to, among other types of coherent structures, PCA-derived plumes. The VITA method is applied to a decomposed dataset in order to identify updrafts (bursts) and downdrafts (sweeps) in the time series of correlated variables by searching the signal for events that satisfy user-specified criteria. With proper use of PCA, surface-layer plumes can be reassembled in a way that yields the same transport relationships no matter which of the two different detecting variables is used.

Original languageEnglish (US)
Pages (from-to)1337-1355
Number of pages19
JournalJournal of the Atmospheric Sciences
Volume59
Issue number8
DOIs
StatePublished - Jan 1 2002

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surface layer
principal component analysis
plume
momentum
updraft
detection method
instrumentation
vessel
boundary layer
kinematics
time series
energy
experiment

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

Mason, Richard A. ; Shirer, Hampton N. ; Wells, Robert ; Young, George Spencer. / Vertical transports by plumes within the moderately convective marine atmospheric surface layer. In: Journal of the Atmospheric Sciences. 2002 ; Vol. 59, No. 8. pp. 1337-1355.
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Vertical transports by plumes within the moderately convective marine atmospheric surface layer. / Mason, Richard A.; Shirer, Hampton N.; Wells, Robert; Young, George Spencer.

In: Journal of the Atmospheric Sciences, Vol. 59, No. 8, 01.01.2002, p. 1337-1355.

Research output: Contribution to journalArticle

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