DOI: 10.1029/2017JC013732
Scopus记录号: 2-s2.0-85051219328
论文题名: Regional Variability and Turbulent Characteristics of the Satellite-sensed Submesoscale Surface Chlorophyll Concentrations
作者: Lee E.A. ; Kim S.Y.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 6 起始页码: 4250
结束页码: 4279
语种: 英语
英文关键词: bloom
; chlorophyll
; energy spectra
; passive tracer
; seasonality
; submesoscale
英文摘要: The regional variability and turbulent characteristics of submesoscale surface chlorophyll concentrations are examined with hourly maps of geostationary ocean color imagery-derived chlorophyll concentrations at a 0.5 km resolution for a period of 5 years (2011–2015) over the East/Japan Sea with concurrent mesoscale and submesoscale observations. Two seasonal blooms occur in the spring and fall within 250 km off the coast that are associated with constructive combinations of light exposure, nutrients, and vertical stratification. Another bloom occurs in the summer and is closely related to regional wind-driven upwelling events. The spring and fall blooms are more significant near the coast (within 40 km from the coast) than offshore because of the more energetic submesoscale horizontal shear and vortical phenomena onshore as well as their propagation in the cross-shore direction. In addition, the regional spring bloom starts offshore and migrate onshore with a time delay of 1 month, which may result from the onshore propagation of geostrophic currents, the deepening of the mixed layer, and favorable nutrient fluxes from the subsurface. The wavenumber-domain energy spectra of chlorophyll concentrations exhibit anisotropy, which may be closely related to bathymetric effects and regional circulations. The spectral decay slopes change from k-5/3 to k-1 at the O(10) km scales and from k-1 to k≤-3 at the O(1) km scales and have weak seasonality. These results are consistent with the two-dimensional quasi-geostrophic turbulence theory and can be interpreted with the baroclinic instability energized from the moderate seasonal mixed layer under mesoscale regional circulations. © 2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113749
Appears in Collections: 气候减缓与适应
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作者单位: Environmental Fluid Mechanics Laboratory, Department of Mechanical Engineering, Korea Advanced Institute of Science and TechnologyDaejeon, South Korea
Recommended Citation:
Lee E.A.,Kim S.Y.. Regional Variability and Turbulent Characteristics of the Satellite-sensed Submesoscale Surface Chlorophyll Concentrations[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(6)