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首页> 外文期刊>Geoscience and Remote Sensing Letters, IEEE >An Improved High-Resolution SST Climatology to Assess Cold Water Events off Florida
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An Improved High-Resolution SST Climatology to Assess Cold Water Events off Florida

机译:改进的高分辨率SST气候学,用于评估佛罗里达州以外的冷水事件

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摘要

Cloud filters developed for high-resolution (1-km) Advanced Very High Resolution Radiometer (AVHRR) satellite-derived sea surface temperature (SST) observations are generally inadequate to capture extreme cold events. Such events impacted shallow waters in Florida Bay and other coastal regions in January 2010 with fatal consequences for large numbers of corals and associated organisms. Raw AVHRR images were reprocessed to understand whether historical knowledge of daily and interannual SST variations could be used to derive a practical cloud-filtering technique. This approach, however, misidentified valid water temperature pixels in nearly 20% of 2703 images collected during the month of January for each year between 1995 and 2010. To create an improved SST climatology, this cloud-filtering method was combined with manually delineated overrides of falsely masked regions. During the January 2010 cold event, this climatology indicated negative SST anomalies of up to 11.6 $^{circ}hbox{C}$ in the Big Bend region and 14 $^{circ}hbox{C}$ in Florida Bay, with high spatial heterogeneity throughout. Our findings highlight the need for improved autonomous cloud-masking techniques to detect cold events in near real time.
机译:为高分辨率(1公里)高级超高分辨率辐射计(AVHRR)卫星海面温度(SST)观测而开发的云过滤器通常不足以捕获极端寒冷事件。这些事件于2010年1月影响了佛罗里达湾和其他沿海地区的浅水区,对大量珊瑚和相关生物造成了致命后果。对原始的AVHRR图像进行重新处理,以了解是否可以使用每日和年际SST变化的历史知识来得出实用的云过滤技术。但是,这种方法在1995年至2010年之间的1月月份中,在每年1月份收集的2703张图像中,有近20%的有效水温像素误判了。为创建更好的SST气候,这种云过滤方法与手动描绘的覆盖率相结合错误掩盖的区域。在2010年1月的寒冷事件中,这种气候显示负SST异常值高达11.6 $ ^ {circ} hbox {C} $ 在大弯区和佛罗里达湾的14个 $ ^ {circ} hbox {C} $ 中,具有较高的空间异质性始终。我们的发现突出表明,需要改进的自主云掩盖技术来近乎实时地检测冷事件。

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