Flugzeuggetragene und bodengebundene Messungen von Albedo, BRDF und Schneeeigenschaften in der Antarktis und deren Kopplung zur Verbesserung prognostischer Schneemodelle

南极洲反照率、BRDF 和雪特性的机载和地面测量及其耦合以改进预测雪模型

• 批准号: 238012225
• 负责人: Dr. Gerit Birnbaum
• 金额: --
• 依托单位: Alfred-Wegener-Institut (AWI) Helmholtz-Zentrum für Polar- und Meeresforschung
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/238012225?language=en
• 关键词: Flugzeuggetragene; und; bodengebundene; Messungen; von

We propose to investigate the temporal and spatial variability of surface albedo, bidirectional reflectivity BRDF and snow properties in Antarctica. The overall goal of the project is to improve prognostic snow models and parameterizations of snow albedo used in regional and global climate models. The parameterizations will be formulated in dependence on snow grain size, snow surface roughness and atmospheric parameters. To achieve this goal we will couple ground based in situ (temporal variability) and airborne remote sensing measurements (spatial variability). Airborne data will include spectral surface albedo, BRDF, surface roughness and snow grain size. Corresponding remote sensing retrieval algorithms will be improved and developed in the project. The same quantities will be measured in situ on the Antarctic plateau by ground based instruments installed at Kohnen Station. The ground based measurements covering the temporal variability of snow and atmospheric properties will allow validating and improving prognostic snow models coupled to a radiative transfer code. By implementing measurement data in the models and comparing simulated and measured snow albedo and by sensitivity studies, snow albedo parameterizations for use in radiative transfer and climate models will be validated and improved. This will reduce uncertainties in predicting future climate change in Antartica.

我们建议调查的时间和空间变化的地表反射率，双向反射率BRDF和雪的属性在南极洲。该项目的总体目标是改进区域和全球气候模型中使用的预报降雪模型和降雪量参数化。参数化将根据雪颗粒大小、雪表面粗糙度和大气参数来制定。为了实现这一目标，我们将耦合地面原位（时间变化）和航空遥感测量（空间变化）。机载数据将包括光谱表面反射率、BRDF、表面粗糙度和雪粒度。相应的遥感反演算法将在本项目中得到改进和发展。同样的数量将由安装在Kohnen站的地面仪器在南极高原现场测量。覆盖雪和大气特性的时间变化的地面测量将允许验证和改进与辐射传输代码耦合的预测雪模型。通过在模型中使用测量数据，比较模拟和测量的雪量，并通过敏感性研究，将验证和改进用于辐射传输和气候模型的雪量参数化。这将减少预测南极洲未来气候变化的不确定性。

项目成果

Comparison of different methods to retrieve optical-equivalent snow grain size in central Antarctica

南极洲中部光学当量雪粒尺寸不同方法反演比较

• DOI: 10.5194/tc-11-2727-2017
• 发表时间: 2017
• 期刊: The Cryosphere
• 作者: Carlsen;Birnbaum;Ehrlich;Freitag;Heygster;Istomina;Kipfstuhl;Schäfer;M. Wendisch
• 通讯作者: M. Wendisch