Spreading of floating particles by Langmuir circulation

Thorpe, S. A.

doi:10.1016/j.marpolbul.2009.07.022

Cited by 19 publications

(13 citation statements)

References 10 publications

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“…The distance between neighboring algal bands in the YS, estimated from satellite images, ranges from hundreds to thousands of meters [4], which is much larger than the typical distance between the convergence lines of Langmuir cells. Thorpe [6] developed a simple theory, which argued that continual combination of Langmuir cells can result in the formation of observed algal bands. Langmuir circulation is a process affecting the bandtype distribution of floating algae or other materials.…”

Section: Interannual Variation and Mechanism Of Drifting Green Algaementioning

confidence: 99%

Drift characteristics of green macroalgae in the Yellow Sea in 2008 and 2010

et al. 2011

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Section: Interannual Variation and Mechanism Of Drifting Green Algaementioning

confidence: 99%

Drift characteristics of green macroalgae in the Yellow Sea in 2008 and 2010

et al. 2011

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“…2(b) and 5, the distributions of floating green algae patches were primarily branched and strip-shaped before beached, which was caused by the Langmuir circulation. 34,35 Nevertheless, the MODIS-derived image depicted the patch distributions with grids of 250 m in width. Thus, the MODIS-derived area would overestimate the actual distribution area by several times.…”

Section: Unmanned Aerial Vehicles-based Verification Of Modis Green Tmentioning

confidence: 99%

Validation of MODIS-based monitoring for a green tide in the Yellow Sea with the aid of unmanned aerial vehicle

Gao

Shang

et al. 2017

J. Appl. Remote Sens

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Abstract. Previous studies have shown that Terra moderate resolution imaging spectroradiometer (MODIS) has low detection and characterization efficiency when mapping a green tide (Ulva prolifera) in the Yellow Sea. To quantify the uncertainty in mapping of the green tide using MODIS data, comparisons were conducted between quasi synchronous MODIS images and in situ observation data, as well as an unmanned aerial vehicle (UAV) image. The results show that MODIS images could detect the location of large (>100 m) floating green algae patches with good positional accuracy but tended to ignore the existence of small patches less than 10 m in width. The floating macroalgae area extracted using MODIS was several times larger than the area mapped using the UAV image. The Sentinel-2 multispectral instrument, the Chinese highresolution GF-1 wide field camera, and the Chinese HJ-1 charge-coupled device are recommended for early green tide detection, whereas MODIS is suitable for green tide monitoring. The UAV could also play an important role in regional green tide monitoring with the advantages of flexibility, smaller dimensions, high spatial resolution, and low cost.

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“…The LC-induced upwelling and downwelling mechanism (convergence and divergence zones) has garnered attention, since upwelling and downwelling are important for plankton and primary production. Furthermore, Thorpe (2009) used simple models to illustrate the separation of bands containing algae or analogous fl oating particles. Further, Kukulka et al (2009Kukulka et al ( , 2011 addressed the dynamic role of LC in upper-ocean mixing.…”

Section: Langmuir Circulationmentioning

confidence: 99%

The spacing of Langmuir circulation under modest wind

Song

2012

Chin. J. Ocean. Limnol.

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Spacing characteristics of Langmuir circulation (LC) are computed by large eddy simulation (LES) model under modest wind. LC is an organized vertical motion, evidenced as buoyant materials forming lines nearly parallel to the wind direction. The horizontal distribution of velocity computed by LES shows clear lines formed by LC. These lines grow and parallel to each other for a while, which we call the stable state, before they fi nally form Y-junctions. We computed spacing between every two parallel lines by averaging them under the stable state. Statistically, spacing results of 154 tests (seven wind speed cases of 22 test runs each) show high correlations between spacing and wind speed, as well as mixed layer depth. The relationship of spacing and wind is important for future LC parameterization of upper-ocean mixing.

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Spreading of floating particles by Langmuir circulation

Cited by 19 publications

References 10 publications

Drift characteristics of green macroalgae in the Yellow Sea in 2008 and 2010

Drift characteristics of green macroalgae in the Yellow Sea in 2008 and 2010

Validation of MODIS-based monitoring for a green tide in the Yellow Sea with the aid of unmanned aerial vehicle

The spacing of Langmuir circulation under modest wind

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