Observations of planview flux patterns within convective structures of the marine atmospheric surface layer

Todd D. Sikora, George Spencer Young

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Air/sea flux variability on horizontal scales from 50 m to several km results, in part, from the presence of coherent convective structures within the atmospheric boundary layer. The horizontal distribution of fluxes within these convective updrafts and downdrafts is, therefore, central to studies of air/sea interaction and remote sensing of sea surface wind and wave fields. This study derives these flux patterns from observations of the Marine Atmospheric Surface Layer (MASL). Research aircraft flights through the MASL provide an optimal means for sampling large numbers of the above-mentioned coherent structures. The NCAR Electra flew numerous legs through the MASL at a height of 50 m during the 1987 stratocumulus phase of Project FIRE (First ISSCP (International Satellite Cloud Climatology Program) Regional Experiment). In situ measurements from these legs serve as the dataset for this paper. The data are processed in such a way as to retain only the turbulence fluctuations. Conditional sampling, based on the vertical velocity field, results in the isolation of convective updrafts and downdrafts. Compositing of the data for these two classes of convective drafts results in horizontal planviews of the vertical fluxes of buoyancy, absolute humidity, along-meanwind component of momentum, and vertical velocity. To ensure dynamical similarity, these horizontal planviews are oriented in a coordinate system aligned with the mean wind.

Original languageEnglish (US)
Pages (from-to)273-288
Number of pages16
JournalBoundary-Layer Meteorology
Volume65
Issue number3
DOIs
StatePublished - Aug 1 1993

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surface layer
updraft
air-sea interaction
stratocumulus
sampling
wave field
wind field
surface wind
in situ measurement
surface wave
buoyancy
climatology
sea surface
momentum
humidity
aircraft
boundary layer
turbulence
flight
remote sensing

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

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title = "Observations of planview flux patterns within convective structures of the marine atmospheric surface layer",
abstract = "Air/sea flux variability on horizontal scales from 50 m to several km results, in part, from the presence of coherent convective structures within the atmospheric boundary layer. The horizontal distribution of fluxes within these convective updrafts and downdrafts is, therefore, central to studies of air/sea interaction and remote sensing of sea surface wind and wave fields. This study derives these flux patterns from observations of the Marine Atmospheric Surface Layer (MASL). Research aircraft flights through the MASL provide an optimal means for sampling large numbers of the above-mentioned coherent structures. The NCAR Electra flew numerous legs through the MASL at a height of 50 m during the 1987 stratocumulus phase of Project FIRE (First ISSCP (International Satellite Cloud Climatology Program) Regional Experiment). In situ measurements from these legs serve as the dataset for this paper. The data are processed in such a way as to retain only the turbulence fluctuations. Conditional sampling, based on the vertical velocity field, results in the isolation of convective updrafts and downdrafts. Compositing of the data for these two classes of convective drafts results in horizontal planviews of the vertical fluxes of buoyancy, absolute humidity, along-meanwind component of momentum, and vertical velocity. To ensure dynamical similarity, these horizontal planviews are oriented in a coordinate system aligned with the mean wind.",
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Observations of planview flux patterns within convective structures of the marine atmospheric surface layer. / Sikora, Todd D.; Young, George Spencer.

In: Boundary-Layer Meteorology, Vol. 65, No. 3, 01.08.1993, p. 273-288.

Research output: Contribution to journalArticle

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