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首页> 外文期刊>Atmospheric chemistry and physics >Global and regional trends of aerosol optical depth over land and ocean using SeaWiFS measurements from 1997 to 2010
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Global and regional trends of aerosol optical depth over land and ocean using SeaWiFS measurements from 1997 to 2010

机译：使用SeaWiFS测量的1997年至2010年全球和区域气溶胶光学深度在陆地和海洋上的趋势

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Both sensor calibration and satellite retrieval algorithm play an importantrole in the ability to determine accurately long-term trends from satellitedata. Owing to the unprecedented accuracy and long-term stability of itsradiometric calibration, SeaWiFS measurements exhibit minimal uncertaintywith respect to sensor calibration. In this study, we take advantage of thiswell-calibrated set of measurements by applying a newly-developed aerosoloptical depth (AOD) retrieval algorithm over land and ocean to investigatethe distribution of AOD, and to identify emerging patterns and trends inglobal and regional aerosol loading during its 13-yr mission. Ourcorrelation analysis between climatic indices (such as ENSO) and AODsuggests strong relationships for Saharan dust export as well asbiomass-burning activity in the tropics, associated with large-scalefeedbacks. The results also indicate that the averaged AOD trend over globalocean is weakly positive from 1998 to 2010 and comparable to that observedby MODIS but opposite in sign to that observed by AVHRR during overlappingyears. On regional scales, distinct tendencies are found for differentregions associated with natural and anthropogenic aerosol emission andtransport. For example, large upward trends are found over the ArabianPeninsula that indicate a strengthening of the seasonal cycle of dustemission and transport processes over the whole region as well as overdownwind oceanic regions. In contrast, a negative-neutral tendency isobserved over the desert/arid Saharan region as well as in the associateddust outflow over the north Atlantic. Additionally, we found decreasingtrends over the eastern US and Europe, and increasing trends over countriessuch as China and India that are experiencing rapid economic development. Ingeneral, these results are consistent with those derived from ground-basedAERONET measurements.
机译：传感器校准和卫星检索算法在从卫星数据准确确定长期趋势的能力中都起着重要作用。由于其辐射校准的空前准确性和长期稳定性，SeaWiFS测量在传感器校准方面显示出最小的不确定性。在这项研究中，我们通过在陆地和海洋上应用新开发的气溶胶深度（AOD）检索算法来利用经过良好校准的一组测量值，以研究AOD的分布，并确定全球和区域气溶胶负荷期间新兴的模式和趋势。它的13年任务。气候指数（例如ENSO）和AOD之间的相关分析表明，撒哈拉尘埃出口以及热带地区生物量燃烧活动与撒哈拉尘埃排放之间存在很强的关系，并伴有大规模的反馈。结果还表明，从1998年至2010年，全球海洋的平均AOD趋势呈弱正值，与MODIS观测到的趋势相当，但与AVHRR在重叠年份观测到的趋势相反。在区域尺度上，发现了与自然和人为气溶胶排放和运输相关的不同区域的不同趋势。例如，在阿拉伯半岛上发现了较大的上升趋势，这表明整个区域以及逆风大洋区域的粉尘排放和运输过程的季节性周期正在加强。相比之下，在沙漠/干旱撒哈拉地区以及北大西洋上空相关的扬尘中都观察到了负中性趋势。此外，我们发现美国东部和欧洲的趋势呈下降趋势，而中国和印度等经济快速发展的国家则呈上升趋势。通常，这些结果与从地面AERONET测量得出的结果一致。

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