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Imprints of atmospheric waves on the Black Sea surface in data of ocean color scanners
Oceanologia ( IF 2.6 ) Pub Date : 2020-02-12 , DOI: 10.1016/j.oceano.2020.01.002
Marina A. Evdoshenko

Data from MERIS onboard Envisat and MODIS onboard Terra and Aqua for 15–16 May 2010 were used to study powerful imprints of atmospheric gravity waves (AGWs) on the western part the Black Sea surface. Two cold fronts crossed the sea following the warm front and caused the AGWs which modulated the sea surface. Imprints of AGWs appeared as stripes of alternating brightness, they had crest length more than a hundred kilometers and wavelength of units of kilometers. Wave amplitude of AGWs imprints, evaluated by a 90%-depth of light penetration into the sea at 490 nm z90, the value inverse to the diffuse attenuation coefficient Kd_490, was units of decimeterxs. MODIS 250-m data of remote sensing reflectance, wind components and atmospheric pressure near the sea surface were obtained by processing the top of atmosphere data with the SeaDAS software package. Negative correlations of fluctuations of z90 with fluctuations of wind stress and atmospheric pressure were found on the transects of more than ten kilometers. The impact of wind stress on the origination of AGW imprints was found to be determinant, while the impact of atmospheric pressure was not more than units of percent.



中文翻译:

海洋彩色扫描仪数据在黑海表面上的大气波压印

来自Envisat上的MERIS以及Terra和Aqua上的MODIS的2010年5月15日至16日的数据被用于研究黑海表面西部的大气重力波(AGW)的强大印记。紧随暖锋之后,两个冷锋越过海洋,导致了AGW调节了海面。AGW的印记显示为交替亮度的条纹,其波峰长度超过100公里,波长为千米单位。通过在490 nm z 90处进入海洋的90%深度的光来评估AGW印迹的波幅,该值与扩散衰减系数Kd相反_490,是分米的单位。通过使用SeaDAS软件包处理大气数据的顶部,可以获取MODIS 250-m遥感数据的反射率,海面附近的风分量和大气压力数据。在十多公里的样线上发现z 90的涨落与风应力和大气压的涨落呈负相关。发现风压对AGW印记起源的影响是决定因素,而大气压的影响不超过百分数的单位。

更新日期:2020-02-12
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