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W4200318162 abstract "Abstract. This study develops the use of spectral total and diffuse irradiance measurements, made from a prototype hyperspectral total-diffuse sunshine pyranometer (SPN-S), to retrieve layer fine-mode aerosol (Ïaer) and total optical depths from airborne platforms. Additionally, we use spectral analysis in an attempt to partition the total optical depth into its Ïaer and cirrus cloud optical depth (Ïcld) components in the absence of coarse-mode aerosols. Two retrieval methods are developed: one leveraging information in the diffuse irradiance and the other using spectral characteristics of the transmitted direct beam, with each approach best suited for specific cloud and aerosol conditions. The SPN-S has advantages over traditional sun photometer systems, including no moving parts and a low cost. However, a significant drawback of the instrument is that it is unable to measure the direct-beam irradiance as accurately as sun photometers. To compensate for the greater measurement uncertainty in the radiometric irradiances, these retrieval techniques employ ratioed inputs or spectral information to reduce output uncertainty. This analysis uses irradiance measurements from the SPN-S and the solar spectral flux radiometer (SSFR) aboard the National Aeronautics and Space Administration's (NASA) P-3 aircraft during the 2018 deployment of the ObseRvations of Aerosols above CLouds and their intEractionS (ORACLES) campaign and the 2019 Cloud, Aerosol and Monsoon Processes Philippines Experiment (CAMP2Ex) mission to quantify above-aircraft cirrus Ïcld and derive vertical profiles of layer Ïaer. Validation of the Ïaer retrieval is accomplished by comparison with co-located measurements of direct solar irradiance made by the Sky-Scanning Sun-Tracking Atmospheric Research (4STAR) and in situ measurements of aerosol optical depth. For the aggregated 2018 ORACLES results, regression between the SPN-S-based method and sun photometer Ïaer values yields a slope of 0.96 with an R2 of 0.96, while the root mean square error (RMSE) is <math xmlns=http://www.w3.org/1998/Math/MathML id=M10 display=inline overflow=scroll dspmath=mathml><mrow><mn mathvariant=normal>3.0</mn><mo>Ã</mo><msup><mn mathvariant=normal>10</mn><mrow><mo>-</mo><mn mathvariant=normal>2</mn></mrow></msup></mrow></math><svg:svg xmlns:svg=http://www.w3.org/2000/svg width=51pt height=14pt class=svg-formula dspmath=mathimg md5hash=9d71120fd6a58e1146b19ac817afe4ce><svg:image xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=amt-15-1373-2022-ie00001.svg width=51pt height=14pt src=amt-15-1373-2022-ie00001.png/></svg:svg>. When comparing the retrieved Ïaer to profiles of integrated in situ measurements of optical extinction, the slope, R2, and RMSE values for ORACLES are 0.90, 0.96, and <math xmlns=http://www.w3.org/1998/Math/MathML id=M13 display=inline overflow=scroll dspmath=mathml><mrow><mn mathvariant=normal>3.4</mn><mo>Ã</mo><msup><mn mathvariant=normal>10</mn><mrow><mo>-</mo><mn mathvariant=normal>2</mn></mrow></msup></mrow></math><svg:svg xmlns:svg=http://www.w3.org/2000/svg width=51pt height=14pt class=svg-formula dspmath=mathimg md5hash=6be9052d0838e7991060ab56b5fee2a3><svg:image xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=amt-15-1373-2022-ie00002.svg width=51pt height=14pt src=amt-15-1373-2022-ie00002.png/></svg:svg>, and for CAMP2Ex they are 0.94, 0.97, and <math xmlns=http://www.w3.org/1998/Math/MathML id=M15 display=inline overflow=scroll dspmath=mathml><mrow><mn mathvariant=normal>3.4</mn><mo>Ã</mo><msup><mn mathvariant=normal>10</mn><mrow><mo>-</mo><mn mathvariant=normal>2</mn></mrow></msup></mrow></math><svg:svg xmlns:svg=http://www.w3.org/2000/svg width=51pt height=14pt class=svg-formula dspmath=mathimg md5hash=6713422a121e1ffc27095bb3e8dfc9fb><svg:image xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=amt-15-1373-2022-ie00003.svg width=51pt height=14pt src=amt-15-1373-2022-ie00003.png/></svg:svg>, respectively. This paper is a demonstration of methods for deriving cloud and aerosol optical properties in environments where both atmospheric constituents may be present. With improvements to the low-cost SPN-S radiometer instrument, it may be possible to extend these methods to a broader set of sampling applications, such as ground-based settings." @default.
W4200318162 created "2021-12-31" @default.
W4200318162 creator A5063907189 @default.
W4200318162 date "2021-11-29" @default.
W4200318162 modified "2023-10-17" @default.
W4200318162 title "Reply to RC1" @default.
W4200318162 doi "https://doi.org/10.5194/amt-2021-269-ac1" @default.
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