Toward a more realistic representation of surface albedo in NASA CERES-derived surface radiative fluxes
نویسندگان
چکیده
Accurate multidecadal radiative flux records are vital to understand Arctic amplification and constrain climate model uncertainties. Uncertainty in the NASA Clouds Earth’s Radiant Energy System (CERES)-derived irradiances is larger over sea ice than any other surface type comes from several sources. The year-long Multidisciplinary drifting Observatory for Study of Climate (MOSAiC) expedition central provides a rare opportunity explore uncertainty CERES-derived fluxes. First, systematic statistically robust assessment shortwave longwave fluxes was conducted using situ measurements MOSAiC stations. CERES Synoptic 1degree (SYN1deg) product overestimates downwelling by +11.40 Wm–2 underestimates upwelling –15.70 –12.58 at during summer. In addition, large differences found when approaches melting point (approximately 0°C). biases suggest that atmosphere represented too optically thin. negative bias can be attributed part lower albedo (–0.15) satellite footprint relative sensors. Additionally, results show spectral used SYN1deg visible mid-infrared bands. A series transfer perturbation experiments performed quantify factors contributing differences. CERES-MOSAiC broadband 20 Wm–2) explain portion difference shape 3 Wm–2). between hourly monthly approximately 25% variability explained not correlated with daily concentration variability. Biases net reduced less half adjusting both cloud inputs toward observed values. indicate improvements data would substantially reduce radiation budget derived products.
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ژورنال
عنوان ژورنال: Elementa
سال: 2022
ISSN: ['2325-1026']
DOI: https://doi.org/10.1525/elementa.2022.00013