Spectral and cospectral characteristics of atmospheric turbulence in the marine boundary layer
- Russian Academy of Sciences, Moscow (Russian Federation). Inst. of Atmospheric Physics
The behavior of frequency spectra and cospectra of atmospheric turbulence over the sea surface is described through analysis of data obtained from shipboard in a number of marine expeditions in Atlantic. These data sets have a wide variety of weather conditions. Many cases have demonstrated similarity between spectra of velocity, temperature and humidity fluctuations as well as momentum, heat and water vapor flux cospectra. These cases are characterized by strongly unstable stratification of surface layer, which observed during expedition in winter/spring 1988 in North Atlantic near Newfoundland Island. However, in weak unstable conditions typical for Subtropical (Pre-ASTEX-91 experiment) and Equatorial Atlantic, spectra of temperature and humidity and heat and moisture flux cospectra were often dissimilar. Spectral dissimilarity of turbulent quantities are also related with unsteady cases. For these cases heat flux cospectra often change sign at low frequency and the net sensible heat flux may be close to zero. The turbulent measurements are accompanied by simultaneous remote sensing of sea surface temperature and cloud low boundary. The obtained results indicate that the anomalous behavior of low-frequency cospectra is related to large-scale circulations (coherent structures) in the atmospheric boundary layer (ABL) and oceanic subsurface layer.
- OSTI ID:
- 467670
- Report Number(s):
- CONF-9409461-; TRN: IM9721%%98
- Resource Relation:
- Conference: 2. International conference on air-sea interaction and on meterology and oceanography of the coastal zone, Lisbon (Portugal), 22-27 Sep 1994; Other Information: PBD: [1994]; Related Information: Is Part Of Second international conference on air-sea interaction and on meteorology and oceanography of the coastal zone; PB: 343 p.
- Country of Publication:
- United States
- Language:
- English
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