Validation of the CLARA-A3 Top-of-Atmosphere Radiative Fluxes Climate Data Record

IF 1.9 4区 地球科学 Q2 ENGINEERING, OCEAN
Tom Akkermans, N. Clerbaux
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Abstract

The third edition of the CM SAF Cloud, Albedo and Surface Radiation dataset from AVHRR data (CLARA-A3) contains for the first time the top-of-atmosphere products reflected solar flux (RSF) and outgoing longwave radiation (OLR), which are presented and validated using CERES, HIRS, and ERA5 reference data. The products feature an unprecedented resolution (0.25°) and time span (4 decades) and offer synergy and compatibility with other CLARA-A3 products. The RSF is relatively stable; its bias with respect to (w.r.t.) ERA5 remains mostly within ±2 W m−2. Deviations are predominantly caused by absence of either morning or afternoon satellite, mostly during the first decade. The radiative impact of the Pinatubo volcanic eruption is estimated at 3 W m−2. The OLR is stable w.r.t. ERA5 and HIRS, except during 1979–80. OLR regional uncertainty w.r.t. HIRS is quantified by the mean absolute bias (MAB) and correlates with observation density and time (satellite orbital configuration), which is optimal during 2002–16, with monthly and daily MAB of approximately 1.5 and 3.5 W m−2, respectively. Daily OLR uncertainty is higher (MAB +40%) during periods with only morning or only afternoon observations (1979–87). During the CERES era (2000–20), the OLR uncertainties w.r.t. CERES-EBAF, CERES-SYN, and HIRS are very similar. The RSF uncertainty achieves optimal results during 2002–16 with a monthly MAB w.r.t. CERES-EBAF of ∼2 W m−2 and a daily MAB w.r.t. CERES-SYN of ∼5 W m−2, and it is more sensitive to orbital configuration than is OLR. Overall, validation results are satisfactory for this first release of TOA flux products in the CLARA-A3 portfolio.
验证 CLARA-A3 大气顶部辐射通量气候数据记录
利用高级甚高分辨率辐射计数据制作的第三版 CM SAF 云层、反照率和表面辐射数据集(CLARA-A3)首次包含了大气层顶层产品反射太阳通量(RSF)和外向长波辐射(OLR),并利用 CERES、HIRS 和 ERA5 参考数据对其进行了展示和验证。这些产品具有前所未有的分辨率(0.25°)和时间跨度(40 年),并与 CLARA-A3 的其他产品具有协同性和兼容性。RSF 相对稳定;相对于 ERA5 的偏差基本保持在 ±2 W m-2 范围内。偏差主要是由于缺少上午或下午的卫星造成的,大部分发生在第一个十年。皮纳图博火山爆发的辐射影响估计为 3 W m-2。相对于ERA5和HIRS,OLR是稳定的,1979-1980年期间除外。与 HIRS 相比,OLR 的区域不确定性由平均绝对偏差(MAB)量化,并与观测密度和时间(卫星轨道配置)相关。在只有上午或只有下午观测的时期(1979-1987 年),每日 OLR 的不确定性更高(MAB +40%)。在 CERES 时代(2000-20 年),CERES-EBAF、CERES-SYN 和 HIRS 的 OLR 不确定性非常相似。在 2002-16 年期间,RSF 的不确定性达到了最佳结果,与 CERES-EBAF 相比的月 MAB 为 ∼2 W m-2,与 CERES-SYN 相比的日 MAB 为 ∼5 W m-2,它对轨道配置比 OLR 更敏感。总体而言,CLARA-A3 组合中首次发布的 TOA 通量产品的验证结果令人满意。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
4.50
自引率
9.10%
发文量
135
审稿时长
3 months
期刊介绍: The Journal of Atmospheric and Oceanic Technology (JTECH) publishes research describing instrumentation and methods used in atmospheric and oceanic research, including remote sensing instruments; measurements, validation, and data analysis techniques from satellites, aircraft, balloons, and surface-based platforms; in situ instruments, measurements, and methods for data acquisition, analysis, and interpretation and assimilation in numerical models; and information systems and algorithms.
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