在NASA ceres衍生的表面辐射通量中更真实地表示表面反照率

IF 4.7 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Yiyi Huang, P. Taylor, F. Rose, D. Rutan, M. Shupe, M. Webster, M. Smith
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引用次数: 5

摘要

精确的多年代际辐射通量记录对于理解北极放大和限制气候模式的不确定性至关重要。美国国家航空航天局云和地球辐射能系统(CERES)产生的辐照度的不确定性在海冰上比任何其他表面类型的辐照度都要大,并且有几个来源。为期一年的北极气候研究多学科漂流观测站(MOSAiC)考察为探索ceres衍生的辐射通量的不确定性提供了难得的机会。首先,利用MOSAiC通量站的原位测量数据,对地表短波和长波通量进行了系统和统计可靠的评估。CERES天气1度(syn1度)产品对夏季地表下涌短波通量高估+11.40 Wm-2,对上涌短波通量低估-15.70 Wm-2,对下涌长波通量低估-12.58 Wm-2。此外,当表面接近熔点(约0℃)时,上升流长波通量差异较大。下行短波和长波通量的偏差表明,CERES所代表的大气在光学上太薄了。上升流短波通量的较大负偏可在很大程度上归因于卫星足迹中相对于地面传感器的较低的地表反照率(-0.15)。此外,SYN1deg使用的光谱表面反照率过高估计了可见光和中红外波段的反照率。通过一系列的辐射传递模型微扰实验来量化造成差异的因素。CERES-MOSAiC宽带反照率差异(约20 Wm-2)比光谱反照率形状差异(约3 Wm-2)更能解释上升流短波通量差异。此外,利用逐小时和逐月的马赛克表面反照率进行的扰动实验之间的差异表明,大约25%的海冰表面反照率变异性是由与海冰浓度日变异性无关的因素解释的。根据观测值调整反照率和云输入,短波和长波净通量的偏差可以减少到一半以下。结果表明,地表反照率和云数据的改善将大大降低CERES数据产品得出的北极地表辐射收支的不确定性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Toward a more realistic representation of surface albedo in NASA CERES-derived surface radiative fluxes
Accurate multidecadal radiative flux records are vital to understand Arctic amplification and constrain climate model uncertainties. Uncertainty in the NASA Clouds and the Earth’s Radiant Energy System (CERES)-derived irradiances is larger over sea ice than any other surface type and comes from several sources. The year-long Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition in the central Arctic provides a rare opportunity to explore uncertainty in CERES-derived radiative fluxes. First, a systematic and statistically robust assessment of surface shortwave and longwave fluxes was conducted using in situ measurements from MOSAiC flux stations. The CERES Synoptic 1degree (SYN1deg) product overestimates the downwelling shortwave flux by +11.40 Wm–2 and underestimates the upwelling shortwave flux by –15.70 Wm–2 and downwelling longwave fluxes by –12.58 Wm–2 at the surface during summer. In addition, large differences are found in the upwelling longwave flux when the surface approaches the melting point (approximately 0°C). The biases in downwelling shortwave and longwave fluxes suggest that the atmosphere represented in CERES is too optically thin. The large negative bias in upwelling shortwave flux can be attributed in large part to lower surface albedo (–0.15) in satellite footprint relative to surface sensors. Additionally, the results show that the spectral surface albedo used in SYN1deg overestimates albedo in visible and mid-infrared bands. A series of radiative transfer model perturbation experiments are performed to quantify the factors contributing to the differences. The CERES-MOSAiC broadband albedo differences (approximately 20 Wm–2) explain a larger portion of the upwelling shortwave flux difference than the spectral albedo shape differences (approximately 3 Wm–2). In addition, the differences between perturbation experiments using hourly and monthly MOSAiC surface albedo suggest that approximately 25% of the sea ice surface albedo variability is explained by factors not correlated with daily sea ice concentration variability. Biases in net shortwave and longwave flux can be reduced to less than half by adjusting both albedo and cloud inputs toward observed values. The results indicate that improvements in the surface albedo and cloud data would substantially reduce the uncertainty in the Arctic surface radiation budget derived from CERES data products.
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来源期刊
Elementa-Science of the Anthropocene
Elementa-Science of the Anthropocene Earth and Planetary Sciences-Atmospheric Science
CiteScore
6.90
自引率
5.10%
发文量
65
审稿时长
16 weeks
期刊介绍: A new open-access scientific journal, Elementa: Science of the Anthropocene publishes original research reporting on new knowledge of the Earth’s physical, chemical, and biological systems; interactions between human and natural systems; and steps that can be taken to mitigate and adapt to global change. Elementa reports on fundamental advancements in research organized initially into six knowledge domains, embracing the concept that basic knowledge can foster sustainable solutions for society. Elementa is published on an open-access, public-good basis—available freely and immediately to the world.
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