Wavelet analysis of atmospheric turbulence over a coral reef flat
Wavelet analysis of atmospheric turbulence over a coral reef flat
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珊瑚礁滩上空大气湍流的小波分析
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发表时间：
2011
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通讯作者：
H. McGowan
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作者：
Andrew J. Wiebe;A. Sturman;H. McGowan
世界热带珊瑚礁面临着严重的漂白事件和物种减少的风险，以应对全球气候变化。珊瑚礁生态系统的生态和经济价值是巨大的，然而很少有人知道发生在珊瑚-海洋-大气界面的物理相互作用。本文介绍并验证了一种新的技术，用于获取表面能量平衡测量苍鹭礁，南大堡礁，澳大利亚的摩羯座掩体组的一部分。测量表面能量和radiationexchanges使用坎贝尔科学涡度协方差（EC）测量系统安装在一个浮动浮筒锚定的礁坪。Nortek Vector速度计被放置在浮筒旁边以记录波浪运动。小波分析技术被用来分解的湍流交换的显热测量的EC单位和比较垂直速度测量波引起的运动记录的速度计。结果表明，虽然EC系统和测速仪共享高共同功率在各自的小波方差谱的间歇期，这些地区是不相干的，不同的强度超过一个数量级。得出的结论是，在一个标准的平均周期为30分钟的波引起的运动的浮筒不会显着干扰的收购和计算湍流通量的显热和潜热，从而确认这种方法的鲁棒性获得表面能量平衡测量珊瑚礁。
The world’s tropical coral reefs are at risk of severe bleaching episodes and species decline in response to globalclimate variability. Theecological andeconomicvalue ofreef ecosystems isenormous,yetverylittle is known of the physical interactions that take place at the coral‐ocean‐atmosphere interfaces. This paper introduces and validates a novel technique for the acquisition of surface energy balance measurements over Heron Reef, part of the Capricorn Bunker Group of the southern Great Barrier Reef, Australia. Measurements of surfaceenergy andradiationexchanges were made using aCampbell Scientific eddy covariance (EC) measurement system mounted on a floating pontoon anchored to the reef flat. A Nortek Vector velocimeter was positioned next to the pontoon to record wave motion. Wavelet analysis techniques were used to decompose the turbulent exchange of sensible heat measured by the EC unit and to compare vertical velocity measurements with wave-induced motion recorded by the velocimeter. The results indicate that although the EC system and the velocimeter share intermittent periods of high common power in their respective wavelet variance spectra, these regions are not coherent and differ in strength by more than an order of magnitude. It was concluded that over a standard averaging period of 30 min the wave-induced motion of the pontoon would not significantly interfere with the acquisition and calculation of turbulent fluxes of sensible and latent heat, thereby confirming the robustness of this method of obtaining surface energy balance measurements over coral reefs.