Numerical Experiments on Seasonal Variations of the Wind-Driven flow and its Mechanics

• Project/Area Number: 22740314
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: Kyushu University
• Principal Investigator: YOSHIKAWA Yutaka 九州大学, 応用力学研究所, 准教授 (40346854)
• Project Period (FY): 2010 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000); Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2011: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2010: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 海洋物理 / 吹送流 / 風成乱流 / 海面加熱による乱流抑制 / 混合層深度 / ストークスドリフト / 熱フラックスの日周変動 / 風成乱流混合 / ラージエディシミュレーション / 熱フラックスの影響

Research Abstract

To clarify mechanism and characteristics of observed seasonal variations in the wind-driven flow, numerical experiments were performed. We found that seasonal variations in the diurnal cycle of a surface heat flux play most significant roles in the variation of the wind-driven flow. A global distribution of the surface wind-driven flow is estimated by deriving analytical solutions of the wind-driven flow under the diurnal cycle. The global distribution indicates a large impact of the diurnal cycle at higher latitudes in winter. These results suggest diurnal cycle of surface heat flux should be taken into account for more accurate predictions of the wind-driven flow and surface drift

Research Products

• [Journal Article] Synergistic surface current mapping by spaceborne stereo imaging and coastal HF radar (2012)
  • Author(s): John P. Matthews and Yutaka Yoshikawa
  • Journal Title: Geophysical Research Letters Volume: vol. 39 Issue: 17
  • DOI: 10.1029/2012gl052546
  • Peer Reviewed
• [Journal Article] The Subpolar Front of the Japan/East Sea. Part III: Competing Roles of Frontal Dynamics and Atmospheric Forcing in Driving Ageostrophic Vertical Circulation and Subduction (2012)
  • Author(s): Yutaka Yoshikawa, Craig M. Lee, and Leif N. Thomas
  • Journal Title: Journal of Physical Oceanography Volume: vol. 42 Issue: 6 Pages: 991-1011
  • DOI: 10.1175/jpo-d-11-0154.1
  • Peer Reviewed
• [Journal Article] 対馬海峡における表層海流変動 (2010)
  • Author(s): 吉川 裕、増田 章、丸林 賢次、石橋 道芳
  • Journal Title: 月刊海洋 Volume: 42巻 Pages: 534-541
  • Peer Reviewed
• [Journal Article] 対馬海峡における表層海流変動 (2010)
  • Author(s): 吉川裕
  • Journal Title: 月刊海洋 Volume: 第42巻9号 Pages: 534-541
• [Presentation] 海面加熱時の混合層深度のスケーリング則 (2013)
  • Author(s): 吉川 裕
  • Organizer: 2013年度日本海洋学会春季大会
  • Place of Presentation: 東京海洋大学
  • Year and Date: 2013-03-24
• [Presentation] 海面加熱下での吹送流と風成乱流のスケーリング則 (2013)
  • Author(s): 吉川 裕
  • Organizer: 第62回理論応用力学講演会
  • Place of Presentation: 東京工業大学
  • Year and Date: 2013-03-07
• [Presentation] 海面加熱時の混合層深度のスケーリング則 (2013)
  • Author(s): 吉川 裕
  • Organizer: ２０１３年度 日本海洋学会春季大会
  • Place of Presentation: 東京海洋大学
• [Presentation] 海面加熱下での吹送流と風成乱流のスケーリング則 (2013)
  • Author(s): 吉川 裕
  • Organizer: 第６２回理論応用力学講演会
  • Place of Presentation: 東京工業大学
• [Presentation] Seasonal Variation of the Wind-Driven Flow and Surface Geostrophic Current in the Tsushima (Korea) Strait (2012)
  • Author(s): Y. Yoshikawa, A. Masuda, M. Ishibashi and K. Marubayashi
  • Organizer: Ocean Radar Conference for Asia
  • Place of Presentation: Seoul、Korea(5)
  • Year and Date: 2012-05-18
• [Presentation] Surface currents obtained from HF radar and satellite images: Synergistic approach for vertical shear estimation near the surface (2012)
  • Author(s): Y. Yoshikawa, J. P. Matthews, and Y. Ide
  • Organizer: Radiowave Workshop 2012
  • Place of Presentation: Toulon、France
  • Year and Date: 2012-04-17
• [Presentation] 海面熱フラックスの日変化を考慮した吹送係数の全球分布 (2012)
  • Author(s): 井手善彦・吉川裕
  • Organizer: 2012年度日本海洋学会春季大会
  • Place of Presentation: 筑波大学第二エリア
  • Year and Date: 2012-03-28
• [Presentation] 前線近傍で発生する上昇流と下降流 (2012)
  • Author(s): 吉川裕
  • Organizer: 2012年度日本海洋学会春季大会
  • Place of Presentation: 筑波大学第二エリア
  • Year and Date: 2012-03-26
• [Presentation] The wind-driven turbulence and flow under surface heating (2012)
  • Author(s): Y. Yoshikawa and Y. Ide
  • Organizer: Ocean Sciences Meeting 2012
  • Place of Presentation: Saltlake City, U.S.A.
  • Year and Date: 2012-02-20
• [Presentation] The wind-driven turbulence and flow under surface heating (2012)
  • Author(s): Yutaka Yoshikawa, Yoshihiko Ide
  • Organizer: Ocean Sciences Meeting 2012
  • Place of Presentation: Salt Lake City, Utah, USA
  • Year and Date: 2012-02-20
• [Presentation] Estimates of the turbulent kinetic energy budget in the convective boundary layer (2012)
  • Author(s): Takahiro Endoh, Takeshi Matsuno, Yutaka Yoshikawa, Eisuke Tsutsumi
  • Organizer: Ocean Sciences Meeting 2012
  • Place of Presentation: Salt Lake City, Utah, USA
  • Year and Date: 2012-02-20
• [Presentation] Synergistic surface current mapping by spaceborne stereo imaging and coastal HF radar (2012)
  • Author(s): John Philip Matthews
  • Organizer: 2012 年度九州沖縄地区合同シンポジウム
  • Place of Presentation: 水産大学校
• [Presentation] Seasonal Variation of the Wind-Driven Flow and Surface Geostrophic Current in the Tsushima (Korea) Strait (2012)
  • Author(s): Yutaka Yoshikawa
  • Organizer: Oceam Radar Conference for Asia
  • Place of Presentation: Mayfield Hotel, Seoul, Korea
• [Presentation] Effects of diurnal cycle of surface heat flux on the seasonal variation of the wind-driven Ekman flow (2012)
  • Author(s): Yoshihiko Ide
  • Organizer: Radiowave Workshop 2012
  • Place of Presentation: PALAIS NEPTUNE, Toulon, France
• [Presentation] Surface currents obtained from HF radar and satellite images: Synergistic approach for vertical shear estimation near the surface (2012)
  • Author(s): Yutaka Yoshikawa
  • Organizer: Radiowave Workshop 2012
  • Place of Presentation: PALAIS NEPTUNE, Toulon, France
• [Presentation] 対流混合層内での乱流運動エネルギー収支の見積り (2011)
  • Author(s): 遠藤貴洋、松野健、吉川裕、堤英輔
  • Organizer: 2011年度日本海洋学会秋季大会
  • Place of Presentation: 九州大学筑紫キャンパス
  • Year and Date: 2011-09-27
• [Presentation] Seasonal variations of the wind-driven Ekman flow estimated from HF radar, a part of an intensive monitoring system in the Tsushima strait (2011)
  • Author(s): Y. Yoshikawa and A. Masuda
  • Organizer: 2011 IUGG General Assembly
  • Place of Presentation: Melbourne, Australia
  • Year and Date: 2011-07-02
• [Presentation] Seasonal variations of the wind-driven Ekman flow estimated from HF radar, a part of an intensive monitoring system in the Tsushima strait (2011)
  • Author(s): Yutaka Yoshikawa, Akira Masuda
  • Organizer: 2011 IUGG General Assembly
  • Place of Presentation: Merborn, Australia
  • Year and Date: 2011-07-02
• [Presentation] Effects of diurnal cycle of surface heat flux on the seasonal variation of the wind-driven Ekman flow (2011)
  • Author(s): Yoshihiko Ide, Yutaka Yoshikawa
  • Organizer: 2011 IUGG General Assembly
  • Place of Presentation: Merborn, Australia
  • Year and Date: 2011-06-29
• [Presentation] 対馬海峡における表層海流変動 (2010)
  • Author(s): 吉川 裕、増田 章、丸林 賢次、石橋 道芳
  • Organizer: 2010年度九州沖縄地区合同シンポジウム
  • Place of Presentation: 鹿児島大学
  • Year and Date: 2010-12-08
• [Presentation] 対馬海峡における表層海流変動 (2010)
  • Author(s): 吉川裕
  • Organizer: 2010年度九州地区合同シンポジウム
  • Place of Presentation: 鹿児島大学稲盛会館
  • Year and Date: 2010-12-08
• [Presentation] 海洋前線域での潜り込み過程に関する数値実験:大気強制力の効果 (2010)
  • Author(s): 吉川 裕
  • Organizer: 黒潮続流域での海面フラックスに関する研究集会
  • Place of Presentation: 名古屋大学
  • Year and Date: 2010-11-28
• [Presentation] 海洋前線域での潜り込み過程に関する数値実験:大気強制力の効果 (2010)
  • Author(s): 吉川裕
  • Organizer: 黒潮族流域での海面フラックスに関する研究集会
  • Place of Presentation: 名古屋大学地球水循環研究センター
  • Year and Date: 2010-11-28
• [Presentation] 熱フラックスの日変化が吹送流に及ぼす影響(2) (2010)
  • Author(s): 井手善彦
  • Organizer: 2010年度日本海洋学会秋季大会
  • Place of Presentation: 東京農業大学生物産業学部
• [Presentation] 対馬海峡における表層海況変動とその機構
  • Author(s): 吉川 裕、増田 章、石橋 道芳、丸林 賢次
  • Organizer: 2012 年度九州沖縄地区合同シンポジウム
  • Place of Presentation: 水産大学校