报告一:Observation of ocean color: Benefit of Lidar Technique;报告二:A standardized evaluation scheme for particulate back-scattering coefficient (bbp) product from space-borne lidar measurements

发布日期:2024-05-13 阅读:111

报告人:Cédric Jamet 教授、Sayoob 博士(法国滨海大学)

邀请人:陈鹏 研究员

时    间:5月15日(周三)10:00-11:30

地    点:1号楼1210会议室


卫星海洋环境动力学国家重点实验室为增进学术交流,促进实验室对外开放,组织系列“海星系列学术讲座”,邀请国内外知名专家与青年科研人员分享前沿科学动态,讨论最新学术成果,欢迎大家踊跃参加。

召集人:陈鹏 研究员

会议时间:5月15日(周三)10:00-11:30

会议地点:1号楼1210会议室

报告一

报告人:Cédric Jamet 教授(法国滨海大学)

报告题目:Observation of ocean color: Benefit of Lidar Technique

报告人简介:Cédric Jamet于2006年在法国北部的Littoral-Côte d'Opale大学和海洋学与地球科学实验室(LOG)任教。作为海洋水色遥感专家,Cedric的研究方向是激光雷达在海洋的应用。Cédric于2012年至2020年担任LOG的“遥感与水动力学”团队负责人,同时担任法国航天局CNES“海洋”组的成员,并在国际海洋水色协调组织和国际空间科学研究所担任两个国际工作组的主席,分别负责研究浑浊水域的海洋水色图像大气校正和激光雷达海洋应用。他曾担任两次海洋光学会议组织委员会的联合主席,自2018年以来,他与海洋二所和浙江大学保持长期深度合作。

报告摘要:Passive remote sensing of the ocean color has changed our vision of the distribution of the phytoplankton and other optically active constituents in the ocean. However, these observations have limitations as they cannot be obtained under clouds, under absorbing aerosols, at high latitudes, during the night, or over the vertical in the ocean. To overcome those limitations, lidars have been used, and led to many ocean discoveries despite not having an ocean optimized lidar satellite mission. To increase lidar literacy for the ocean community, it is necessary to provide comprehensive background and training on the technique but also on the ways to process the lidar signal. International efforts have developed lately in the form of an International Team at the International Space Sciences Institute. After a brief presentation of my laboratory and team in France, I will present the progress made worldwide about oceanic profiling lidar from different platforms with an emphasize on the possibility to hack past and current space borne lidars. I will showcase how lidar can be beneficial to explore the vertical structure of the upper ocean. Finally,I will provide key points about the current international collaborations and about the way to promote oceanic profiling lidar in the ocean color community.

报告二

报告人:Sayoob 博士(法国滨海大学)

报告题目:A standardized evaluation scheme for particulate back-scattering coefficient (bbp) product from space-borne lidar measurements

报告人简介:Sayoob,法国Littoral-Côte d'Opale大学和海洋学与地球科学实验室博士后,研究方向包含海洋光学、高光谱遥感卫星图像处理和海洋激光雷达技术等,著有9篇高水平SCI论文。

报告摘要:

Space-borne lidar presents a strong potential for the future of ocean observations with depth-resolved measurements, overcoming some limitations of the conventional passive ocean color remote sensing and complementing them. Measurements from lidar sensors such as CALIOP.

were recently used to retrieve the particulate back-scattering coefficient, bbp, despite the sensor originally being designed for atmospheric studies.

It is important to validate the space-borne lidar measurements for ocean applications. Few studies validated the CALIOP ocean products, but each of them designed its own evaluation scheme. However, it is also critical to have a standardized evaluation scheme for these studies to be compared across time, geography, and sensors. Here we propose an objective evaluation scheme that could be applied to any current and future space-borne lidars for ocean applications.

We tested twenty combinations of distance (from 9-km to 50-km) and time (from 9 h to 16 days) differences and a statistical score was used to objectively select the best optimal time-distance window, leading to the best compromise in term of number of match-ups and low errors in the CALIOP product. Based on this, we propose to use either a 24 h/9 km or 24 h/15 km window for the evaluation of space-borne lidar oceanic products.



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