Atmospheric sounding over the winter Kuroshio Extension: Effect of surface stability on atmospheric boundary layer structure

Hiroki Tokinaga, Youichi Tanimoto, Masami Nonaka, Bunmei Taguchi, Tomohiro Fukamachi, Shang Ping Xie, Hisashi Nakamura, Tomowo Watanabe, Ichiro Yasuda

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

Shipboard radiosonde surveys were conducted during the 2003-04 winter east of Japan to study atmospheric boundary layer (ABL) structure over the Kuroshio Extension. ABL displayed large variations in vertical structure, most of which are attributable to changes in atmospheric surface stability. Where the surface atmosphere was unstable (neutral) as measured by the sea-air temperature difference, surface turbulent heat flux increased (decreased) and a mixed-layer developed (undeveloped) with weakened (intensified) vertical wind shear. A linear regression analysis indicates that ABL height tends to increase by 1km as the sea-air temperature difference increases by 7°C or surface turbulent heat flux by 500 Wm-2. While meridional thermal advection by weather disturbances seems to cause much of atmospheric stability variability during the 43-day surveys, the strong sensitivity of vertical mixing and wind shear to stability is consistent with the observed in-phase co-variability of SST and surface wind from satellite on monthly and longer timescales.

Original languageEnglish
Article numberL04703
JournalGeophysical Research Letters
Volume33
Issue number4
DOIs
Publication statusPublished - Feb 28 2006
Externally publishedYes

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surface stability
atmospheric sounding
atmospheric boundary layer
winter
boundary layer
wind shear
heat flux
temperature gradients
air temperature
radiosondes
air
vertical mixing
radiosonde
advection
surface wind
weather
mixed layer
regression analysis
Japan
disturbances

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Atmospheric sounding over the winter Kuroshio Extension : Effect of surface stability on atmospheric boundary layer structure. / Tokinaga, Hiroki; Tanimoto, Youichi; Nonaka, Masami; Taguchi, Bunmei; Fukamachi, Tomohiro; Xie, Shang Ping; Nakamura, Hisashi; Watanabe, Tomowo; Yasuda, Ichiro.

In: Geophysical Research Letters, Vol. 33, No. 4, L04703, 28.02.2006.

Research output: Contribution to journalArticle

Tokinaga, H, Tanimoto, Y, Nonaka, M, Taguchi, B, Fukamachi, T, Xie, SP, Nakamura, H, Watanabe, T & Yasuda, I 2006, 'Atmospheric sounding over the winter Kuroshio Extension: Effect of surface stability on atmospheric boundary layer structure', Geophysical Research Letters, vol. 33, no. 4, L04703. https://doi.org/10.1029/2005GL025102
Tokinaga, Hiroki ; Tanimoto, Youichi ; Nonaka, Masami ; Taguchi, Bunmei ; Fukamachi, Tomohiro ; Xie, Shang Ping ; Nakamura, Hisashi ; Watanabe, Tomowo ; Yasuda, Ichiro. / Atmospheric sounding over the winter Kuroshio Extension : Effect of surface stability on atmospheric boundary layer structure. In: Geophysical Research Letters. 2006 ; Vol. 33, No. 4.
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