Monitoring Sea Ice Evolution with Ultrawideband Microwave Radiometry in the MoSAIC Campaign

在 MoSAIC 活动中利用超宽带微波辐射测量监测海冰演变

• 批准号: 1838401
• 负责人: Joel Johnson
• 金额: $ 52.6万
• 依托单位: Ohio State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-03-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1838401&HistoricalAwards=false
• 关键词: Monitoring; Sea; Ice; Evolution; Ultrawideband

The evolution of the Arctic is a key question for the future of our planet. One key aspect is to understand how processes in the atmosphere, ocean, and sea ice interact and affect Arctic ocean sea ice behavior and distribution. As part of the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) campaign, this project is deploying an ultra-wideband microwave radiometer to improve the ability to remotely determine sea ice thickness information. The long term measurements of sea ice available from MOSAiC's one year deployment of the RV Polarstern into an Arctic ice floe, combined with the extensive ice, ocean, and atmosphere in-situ measurements to be acquired, provide an optimal environment for sea ice monitoring studies, which in turn enable better models of sea ice evolution. Those models are criticall important to advancing Arctic system science and predicting the future of the Arctic. Student training will also provide societal impact by preparing the next generation of researchers in polar science and observation.The difficult conditions of the Arctic along with its spatially heterogeneous forcing motivate remote Earth observations from satellites or airborne platforms. Remote sensing systems have proven to be effective in monitoring sea ice extent and fractional cover, as well as sea ice thickness and type to a lesser extent. Current L-band (1.4-GHz) microwave radiometers and laser altimeters have limited sensitivity to ice thickness in the range from 0.5 to 2 meters, which is increasingly common as compared to thicker multi-year ice. An ability to sense sea ice temperature and salinity properties, and particularly their variations within the ice itself, could also provide important new benefits for understanding ice formation and dissolution.The project is deploying a four channel ultra-wideband microwave radiometer observing from 0.5 to 2 GHz as part of the MOSAiC central observatory in order to acquire a unique dataset of ice thermal emissions and their variations with thickness and other ice properties. By measuring thermal emissions from sea ice at multiple frequencies, and frequencies lower than 1.4 GHz, more information on ice properties, and to greater depth, will be possible. The measurements acquired will further play an important role in bridging between the point in situ measurements to be acquired by other MOSAiC program investigators and the approximately 9 m x 26 m instrument footprint that will provide ice properties averaged over the "intermediate" scales associated with ice floes. The three year project includes instrument preparation and planning in year one, campaign participation in year 2 (including staffing by project personnel during MOSAiC legs I and II), and extensive data analysis in year 3.By advancing understanding of the spatial scaling between sea ice properties at point (in situ) and floe scales, the project will provide an important link to enable "sub-grid-scale" phenomena parameterization in sea ice forecast models. The time histories of thickness, salinity, and temperature acquired will also represent important datasets for characterizing the sea ice energy budget over relevant spatial scales. The advancement achieved in the use of passive microwave remote sensing will also provide new insights into the electromagnetic properties of sea ice for use in future development of new instrumentation and satellite observation methods.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

北极的演变是我们星球未来的关键问题。 一个关键方面是了解大气，海洋和海冰中的过程如何相互作用并影响北极海洋冰行为和分布。 作为北极气候研究（马赛克）运动的多学科漂流观测站的一部分，该项目正在部署超宽带微波辐射仪，以提高远程确定海冰厚度信息的能力。从马赛克（Mosaic）将RV Polarstern的一年部署到北极冰浮游的长期测量值，再加上要获得的广泛的冰，海洋和大气层的现场测量值，为海冰监测研究提供了最佳的环境，这反过来又促进了更好的海冰进化模型。 这些模型对于推进北极系统科学和预测北极的未来很重要。学生培训还将通过准备下一代极地科学和观察的研究人员来提供社会影响。北极的困难条件及其在空间异质性的强迫迫使卫星或空中平台的远程地球观察。事实证明，遥感系统可有效监测海冰范围和分数覆盖，以及海冰厚度和较小程度的类型。当前的L波段（1.4-GHz）微波辐射仪和激光高度计在0.5到2米之间对冰厚度的敏感性有限，与较厚的多年冰相比，这越来越普遍。一种感觉到海冰温度和盐度特性，尤其是它们在冰本身中的变化的能力，也可以为理解冰形成和溶解提供重要的新好处。该项目正在部署一个四通道超宽带微波辐射仪，观察到0.5到2 GHz，从0.5到2 GHz，作为摩西中心观测值的一部分，作为冰层的冰层和其他变化的数据，以获取冰层的一部分。通过在多个频率下测量海冰的热排放，以及低于1.4 GHz的频率，有关冰性能的更多信息以及更大的深度。 所获得的测量将进一步在桥接的位置测量点之间桥接，并由其他马赛克计划研究者和大约9 m x 26 m的仪器足迹获得，该仪器足迹将提供与冰浮游相关的“中间”尺度的平均冰属性。为期三年的项目包括在第一年的仪器准备和计划，在第二年级的竞选活动（包括在马赛克I和II期间由项目人员人员配备）以及3年级的大量数据分析。通过提高人们对Point Point（Intu）（原位）和地板量表之间的空间缩放的理解，该项目将为“亚网格范围”的模型提供重要的联系。所获得的厚度，盐度和温度的时间历史也将代表重要的数据集，以表征相关空间尺度的海冰能预算。在使用被动微波遥感方面取得的进步还将为海冰的电磁特性提供新的见解，以在未来开发新的仪器和卫星观察方法中使用。这项奖项反映了NSF的法定任务，并被认为是通过该基金会的知识功能和广泛影响的评估来评估CRETERIA的评估。

项目成果

Studies of the Retrieval of Sea Ice Thickness and Salinity with Wideband Microwave Radiometry

• DOI: 10.1109/igarss47720.2021.9554266
• 发表时间: 2021-01-01
• 期刊: P 2021 IEEE INT GEOS
• 作者: Demir, O.;Jezek, K.;Johnson, J.
• 通讯作者: Johnson, J.

Sea Ice Observations with 0.5-2 GHz Microwave Radiometry as part of the MOSAiC Campaign

作为 MOSAiC 活动的一部分，使用 0.5-2 GHz 微波辐射测量进行海冰观测

• 发表时间: 2020
• 期刊: MicroRad 2020 Conference
• 作者: Demir, Oguz;Andrews, Mark;Downs, Brandi;Johnson, Joel;Jezek, Ken;Kaleschke, Lars
• 通讯作者: Kaleschke, Lars

Measurements of 540-1740 MHz Brightness Temperatures of Sea Ice During the Winter of the MOSAiC Campaign

MOSAiC 运动冬季海冰 540-1740 MHz 亮度温度的测量

• DOI: 10.1109/tgrs.2021.3105360
• 发表时间: 2021
• 期刊: IEEE Transactions on Geoscience and Remote Sensing
• 影响因子: 8.2
• 作者: Demir, Oguz;Johnson, Joel T.;Jezek, Kenneth C.;Andrews, Mark J.;Ayotte, Kenneth;Spreen, Gunnar;Hendricks, Stefan;Kaleschke, Lars;Oggier, Marc;Granskog, Mats A.
• 通讯作者: Granskog, Mats A.

Wideband Microwave Radiometry for the Retrieval of Arctic Sea Ice Physical Properties in the MOSAiC Campaign

MOSAiC 活动中用于反演北极海冰物理特性的宽带微波辐射测量

• 发表时间: 2020
• 期刊: AGU Fall Meeting
• 作者: Demir, O.;Andrews, M.;Ayotte, K.;Jezek, K. C.;Spreen, G.;Hendricks, S.;Stroeve, J.;Huntemann, M.;Tonboe, R. T.;Nandan, V.
• 通讯作者: Nandan, V.