Long-term observations of the dynamics of the continental planetary boundary layer

C. Yi, Kenneth James Davis, B. W. Berger

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

Time series of mixed layer depth. zi, and stable boundary layer height from March through October of 1998 are derived from a 915-MHz boundary layer profiling radar and CO2 mixing ratio measured from a 447-m tower in northern Wisconsin. Mixed layer depths from the profiler are in good agreement with radiosonde measurements. Maximum zi occurs in May, coincident with the maximum daytime surface sensible heat flux. Incoming radiation is higher in June and July, but a greater proportion is converted to latent heat by photosynthesizing vegetation. An empirical relationship between zi and the square root of the cumulative surface virtual potential temperature flux is obtained (r2 = 0.98) allowing estimates of zi from measurements of virtual potential temperature flux under certain conditions. In fair-weather conditions the residual mixed layer top was observed by the profiler on several nights each month. The synoptic mean vertical velocity (subsidence rate) is estimated from the temporal evolution of the residual mixed layer height during the night. The influence of subsidence on the evolution of the mixed, stable, and residual layers is discussed. The CO2 jump across the inversion at night is also estimated from the lower measurements.

Original languageEnglish (US)
Pages (from-to)1288-1299
Number of pages12
JournalJournal of the Atmospheric Sciences
Volume58
Issue number10
DOIs
StatePublished - May 15 2001

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mixed layer
boundary layer
profiler
potential temperature
subsidence
sensible heat flux
radiosonde
temporal evolution
mixing ratio
radar
time series
vegetation

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

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abstract = "Time series of mixed layer depth. zi, and stable boundary layer height from March through October of 1998 are derived from a 915-MHz boundary layer profiling radar and CO2 mixing ratio measured from a 447-m tower in northern Wisconsin. Mixed layer depths from the profiler are in good agreement with radiosonde measurements. Maximum zi occurs in May, coincident with the maximum daytime surface sensible heat flux. Incoming radiation is higher in June and July, but a greater proportion is converted to latent heat by photosynthesizing vegetation. An empirical relationship between zi and the square root of the cumulative surface virtual potential temperature flux is obtained (r2 = 0.98) allowing estimates of zi from measurements of virtual potential temperature flux under certain conditions. In fair-weather conditions the residual mixed layer top was observed by the profiler on several nights each month. The synoptic mean vertical velocity (subsidence rate) is estimated from the temporal evolution of the residual mixed layer height during the night. The influence of subsidence on the evolution of the mixed, stable, and residual layers is discussed. The CO2 jump across the inversion at night is also estimated from the lower measurements.",
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Long-term observations of the dynamics of the continental planetary boundary layer. / Yi, C.; Davis, Kenneth James; Berger, B. W.

In: Journal of the Atmospheric Sciences, Vol. 58, No. 10, 15.05.2001, p. 1288-1299.

Research output: Contribution to journalArticle

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