权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Characterization of Antarctic Firn by Multi-Frequency Passive Remote Sensing from Space

空间多频被动遥感表征南极杉木

基本信息

批准号：
1844793
负责人：
Mustafa Aksoy
金额：
$ 33.71万
依托单位：
SUNY at Albany
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：
2019-04-15 至 2023-03-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1844793&HistoricalAwards=false
关键词：
Characterization Antarctic Firn Multi Frequency

项目摘要

This project will test the hypothesis that physical and thermal properties of Antarctic firn--partially compacted granular snow in an intermediate stage between snow and glacier ice--can be remotely measured from space. Although these properties, such as internal temperature, density, grain size, and layer thickness, are highly relevant to studies of Antarctic climate, ice-sheet dynamics, and mass balance, their measurement currently relies on sparse in-situ surveys under challenging weather conditions. Sensors on polar-orbiting satellites can observe the entire Antarctic every few days during their years-long lifetime. Consequently, the approaches developed in this study, when coupled with the advancing technologies of small and low-cost CubeSats, aim to contribute to Antarctic science and lead to cost-effective, convenient, and accurate long-term analyses of the Antarctic system while reducing the human footprint on the continent. Moreover, the project will be solely based on publicly-available datasets; thus, while contributing to interdisciplinary undergraduate and graduate research and education at the grantee's institution, the project will also encourage engagement of citizen scientists through its website. The overarching goal of this project is to characterize Antarctic firn layers in terms of their thickness, physical temperature, density, and grain size through multi-frequency microwave radiometer measurements from space. Electromagnetic penetration depth changes with frequency in ice; thus, multi-frequency radiometers are able to profile firn layer properties versus depth. To achieve its objective, the project will utilize the Global Precipitation Measurement (GPM) satellite constellation as a single multi-frequency microwave radiometer system with 11 frequency channels observing the Antarctic Ice Sheet. Archived in-situ measurements of Antarctic firn density, grain size, temperature, and layer thickness will be collected and separated into training and test datasets. Microwave emissions simulated using the training data will be compared to GPM constellation measurements to evaluate and improve state-of-the-art forward microwave emission models. Based on these models, the project will develop numerical retrieval algorithms for the thermal and physical properties of Antarctic firn. Results of retrievals will be validated using the test dataset, and uncertainty and error analyses will be conducted. Lastly, changes in the thermal and physical characteristics of Antarctic firn will be examined through long-term retrieval studies exploiting GPM constellation measurements.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.

该项目将检验这样一种假设，即南极雪-雪和冰川冰之间的中间阶段的部分压实的粒状雪-的物理和热特性可以从空间进行远程测量。虽然这些属性，如内部温度，密度，粒度和层厚度，是高度相关的南极气候，冰盖动力学和质量平衡的研究，他们的测量目前依赖于稀疏的现场调查在具有挑战性的天气条件下。极地轨道卫星上的传感器在其长达数年的寿命中每隔几天就可以观测整个南极洲。因此，本研究中开发的方法与小型和低成本立方体卫星的先进技术相结合，旨在为南极科学做出贡献，并导致对南极系统进行具有成本效益，方便和准确的长期分析，同时减少人类对该大陆的足迹。此外，该项目将完全基于公开的数据集;因此，在促进受赠方机构的跨学科本科生和研究生研究和教育的同时，该项目还将鼓励公民科学家通过其网站参与。该项目的首要目标是通过从空间进行的多频微波辐射计测量，确定南极雪层的厚度、物理温度、密度和颗粒大小。电磁穿透深度随冰中频率的变化而变化;因此，多频辐射计能够描绘积雪层特性与深度的关系。为实现其目标，该项目将利用全球降水测量卫星星座作为一个单一的多频微波辐射计系统，有11个频道观测南极冰盖。将收集南极积雪密度、粒度、温度和积雪层厚度的现场测量存档，并将其分为训练和测试数据集。使用训练数据模拟的微波发射将与GPM星座测量进行比较，以评估和改进最先进的前向微波发射模型。根据这些模型，该项目将为南极积雪的热特性和物理特性制定数值反演算法。检索结果将使用测试数据集进行验证，并将进行不确定性和误差分析。最后，将通过利用GPM星座测量的长期检索研究来检查南极积雪的热特性和物理特性的变化，该奖项反映了NSF的法定使命，并被认为值得通过使用基金会的知识价值和更广泛的影响审查标准进行评估来支持。

项目成果

期刊论文数量（9）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Antarctic Firn Characterization through Wideband Microwave Radiometry

通过宽带微波辐射测量来表征南极杉木

DOI：
10.23919/usnc-ursinrsm57467.2022.9881463
发表时间：
2022
期刊：
2022 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM
影响因子：
0
作者：
Kar, Rahul;Aksoy, Mustafa;Kaurejo, Dua
通讯作者：
Kaurejo, Dua

Multi-Frequency Microwave Radiometry for Retrieving Antarctic Firn Subsurface Temperatures

用于反演南极冰层地下温度的多频微波辐射测量

DOI：
10.23919/at-ap-rasc54737.2022.9814215
发表时间：
2022
期刊：
2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC
影响因子：
0
作者：
Kar, Rahul;Aksoy, Mustafa;Kaurejo, Dua
通讯作者：
Kaurejo, Dua

Antarctic Firn Characterization via Wideband Microwave Radiometry

通过宽带微波辐射测量法表征南极杉木

DOI：
10.3390/rs14092258
发表时间：
2022
期刊：
Remote Sensing
影响因子：
5
作者：
Kar, Rahul;Aksoy, Mustafa;Kaurejo, Dua;Atrey, Pranjal;Devadason, Jerusha Ashlin
通讯作者：
Devadason, Jerusha Ashlin

A review of recent developments in low-frequency ultra-wideband microwave radiometry for studies of the cryosphere

冰冻圈研究低频超宽带微波辐射测量的最新进展综述

DOI：
10.3389/feart.2022.1029216
发表时间：
2022
期刊：
Frontiers in Earth Science
影响因子：
2.9
作者：
Jezek, K.C.;Johnson, J.T.;Tsang, L.;Brogioni, M.;Macelloni, G.;Aksoy, M.;Kaleschke, L.;Wang, S.;Leduc-Leballeur, M.;Yardim, C.
通讯作者：
Yardim, C.

Feasibility of Estimating Ice Sheet Internal Temperatures Using Ultra-Wideband Radiometry

使用超宽带辐射测量估算冰盖内部温度的可行性

DOI：
10.1109/tgrs.2022.3208754
发表时间：
2022
期刊：
IEEE Transactions on Geoscience and Remote Sensing
影响因子：
8.2
作者：
Duan, Yuna;Yardim, Caglar;Durand, Michael;Jezek, Kenneth C.;Johnson, Joel T.;Bringer, Alexandra;Tan, Shurun;Tsang, Leung;Aksoy, Mustafa
通讯作者：
Aksoy, Mustafa