DOI: 10.5194/tc-14-2369-2020
论文题名: The Arctic Ocean Observation Operator for 6.9 GHz (ARC3O)-Part 1: How to obtain sea ice brightness temperatures at 6.9 GHz from climate model output
作者: Burgard C. ; Notz D. ; Pedersen L.T. ; Tonboe R.T.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 7 起始页码: 2369
结束页码: 2386
语种: 英语
英文关键词: brightness temperature
; climate modeling
; observational method
; sea ice
; sea surface temperature
英文摘要: We explore the feasibility of an observation operator producing passive microwave brightness temperatures for sea ice at a frequency of 6.9 GHz. We investigate the influence of simplifying assumptions for the representation of sea ice vertical properties on the simulation of microwave brightness temperatures. We do so in a one-dimensional setup, using a complex 1D thermodynamic sea ice model and a 1D microwave emission model. We find that realistic brightness temperatures can be simulated in cold conditions from a simplified linear temperature profile and a simplified salinity profile as a function of depth in the ice. These realistic brightness temperatures can be obtained based on profiles interpolated to as few as five layers. Most of the uncertainty resulting from the simplifications is introduced by the simplification of the salinity profiles. In warm conditions, the simplified salinity profiles lead to brine volume fractions that are too high in the subsurface layer. To overcome this limitation, we suggest using a constant brightness temperature for the ice during warm conditions and treating melt ponds as water surfaces. Finally, in our setup, we cannot assess the effect of wet snow properties. As periods of snow with intermediate moisture content, typically occurring in spring and fall, locally last for less than a month, our approach allows one to estimate realistic brightness temperatures at 6.9 GHz from climate model output for most of the year. © 2020 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164413
Appears in Collections: 气候变化与战略
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作者单位: Max Planck Institute for Meteorology, Hamburg, Germany; International Max Planck Research School for Earth System Modelling, Hamburg, Germany; Institute of Oceanography, Center for Earth System Research and Sustainability, Universität Hamburg, Hamburg, Germany; National Space Institute, Technical University of Denmark, Lyngby, Denmark; Danish Meteorological Institute, Copenhagen, Denmark
Recommended Citation:
Burgard C.,Notz D.,Pedersen L.T.,et al. The Arctic Ocean Observation Operator for 6.9 GHz (ARC3O)-Part 1: How to obtain sea ice brightness temperatures at 6.9 GHz from climate model output[J]. Cryosphere,2020-01-01,14(7)