Preliminary Assessment and Verification of the Langley Plots Calibration of the Sun Photometer at Mt Foyeding Observatory, Beijing

Remote Sensing, Journal Year: 2022, Volume and Issue: 14(17), P. 4321 - 4321

Published: Sept. 1, 2022

An assessment and verification of the Langley calibration method Sun photometer at Mt Foyeding (MFYD) Observatory in Beijing was performed. We explored whether plot is practicable for this mountainous site by analyzing aerosol climatology carrying out a case study. Then, optical depth (AOD) results were verified under reference AERONET AOD. The showed that satisfactory atmospheric conditions are present on winter mornings, characterized smaller average AOD (~0.09–0.14) lower range ratio (~36.97–63.38%) than afternoons over whole day. six days selected as study all stable daily triplets <2% wavelengths. residual sum squares V0λ wavelengths <0.0002 standard deviation <0.2%. A large improvement found linear regression morning relative to statistics obtained day, when coefficient determination promoted 0.22–2.90% ~2.76–23.32, respectively. final value derived from 31 observation deviations about −1.69, −1.29, −0.81, −0.42, −0.34, −0.22, −0.63 −0.36% 340, 380, 440, 500, 675, 870, 1020 1640 nm, analysis validation perfect performance, with 100% retrievals lying within expected error (0.05 ± 10%) 380 nm 99.99% 340 band. Good agreement (correlation coefficients > 0.998) values ranging ~0.006 0.011 observed, mean bias varying 0.999 1.066. biases concentrated ±0.02 ultraviolet bands ±0.01 other bands; therefore, preliminary indicated plots suitable MFYD Observatory.

Language: Английский

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Columnar Optical and Radiative Properties of Aerosols in the Arctic Summer from Long-Term Aeronet Measurements

Published: Jan. 1, 2023

Aerosols as an external factor have important role in the amplification of Arctic warming, yet geography this harsh region has led to a paucity observations, which limited our understanding climate. We synthesized latest decade (2010–2021) data on microphysical–optical–radiative properties aerosols and their multi-component evolution during summer, taking into consideration biomass burning. Our results are based continuous observations from eight AERONET sites across region, together meteorological reanalysis dataset satellite fires, utilize back-trajectory model track source aerosols. The summer climatological characteristics within Circle showed that mainly fine-mode (fraction >0.95) with radius 0.15–0.20 μm, slight extinction coefficient (AOD440nm~ 0.11) moderate strong scattering (SSA440nm~ 0.95) dominant forward (ASY440nm~ 0.68). These optical result significant cooling at Earth’s surface (DARF-BOA ~ −13 W m−2) weak effect top atmosphere (DARF-TOA −5 m−2）. Further, we found is severely impacted by burning (BB) events July August, primarily occur central eastern Siberia followed subpolar North America. plumes BB transport westerly circulation, leading increase containing large amounts organic carbon. Absorptive carbonaceous also synergistically, could convert instantaneous direct aerosol radiative heating Earth–atmosphere system. This study provides insights complex sources loading emphasizes impacts increasingly frequent occurrence wildfire recent years.

Language: Английский

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Reply on RC3

Published: Jan. 5, 2022

Abstract. An evaluation of aerosol microphysical, optical and radiative properties measured with a multiwavelength photometer named CW193 was performed in this study. The instrument has highly integrated design, smart control performance is composed three parts (the head, robotic drive platform stents system). Based on synchronous measurements, the products were validated using reference data from AERONET CE318 photometer. results show that raw digital counts agree well (R>0.989), daily average triplets around 1.2 % to 3.0 % for ultraviolet band less than 2.0 % visible infrared bands. Good depth agreement class="inline-formula">R>0.997, 100 % within expected error) root mean square error (RMSE) values ranging 0.006 (for 870 nm band) 0.016 440 nm obtained, relative bias (RMB) 0.922 1.112 ±0.04. maximum deviation peak value fine-mode particles varied about 8.9 % 77.6 %, whereas variation coarse-mode 13.1 % 29.1 %. variations single scattering albedo approximately 0.1 %–1.8 %, 0.6 %–1.9 %, 0.1 %–2.6 % 0.8 %–3.5 % 440, 675, 870 1020 nm bands, respectively. For direct forcing, deviations 4.8 %–12.3 % obtained at earth's surface 5.4 %–15.9 % top atmosphere. In addition, water vapor retrievals showed satisfactory accuracy, characterized by high class="inline-formula">R class="inline-formula">∼0.997), small RMSE class="inline-formula">∼0.020) good distribution (100 % error). RMB 0.979, biases mostly class="inline-formula">±0.04, concentrated within class="inline-formula">±0.02.

Language: Английский

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Reply on RC2

Published: Jan. 5, 2022

Abstract. An evaluation of aerosol microphysical, optical and radiative properties measured with a multiwavelength photometer named CW193 was performed in this study. The instrument has highly integrated design, smart control performance is composed three parts (the head, robotic drive platform stents system). Based on synchronous measurements, the products were validated using reference data from AERONET CE318 photometer. results show that raw digital counts agree well (R>0.989), daily average triplets around 1.2 % to 3.0 % for ultraviolet band less than 2.0 % visible infrared bands. Good depth agreement class="inline-formula">R>0.997, 100 % within expected error) root mean square error (RMSE) values ranging 0.006 (for 870 nm band) 0.016 440 nm obtained, relative bias (RMB) 0.922 1.112 ±0.04. maximum deviation peak value fine-mode particles varied about 8.9 % 77.6 %, whereas variation coarse-mode 13.1 % 29.1 %. variations single scattering albedo approximately 0.1 %–1.8 %, 0.6 %–1.9 %, 0.1 %–2.6 % 0.8 %–3.5 % 440, 675, 870 1020 nm bands, respectively. For direct forcing, deviations 4.8 %–12.3 % obtained at earth's surface 5.4 %–15.9 % top atmosphere. In addition, water vapor retrievals showed satisfactory accuracy, characterized by high class="inline-formula">R class="inline-formula">∼0.997), small RMSE class="inline-formula">∼0.020) good distribution (100 % error). RMB 0.979, biases mostly class="inline-formula">±0.04, concentrated within class="inline-formula">±0.02.

Language: Английский

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Reply on CC1

Published: Jan. 19, 2022

Abstract. An evaluation of aerosol microphysical, optical and radiative properties measured with a multiwavelength photometer named CW193 was performed in this study. The instrument has highly integrated design, smart control performance is composed three parts (the head, robotic drive platform stents system). Based on synchronous measurements, the products were validated using reference data from AERONET CE318 photometer. results show that raw digital counts agree well (R>0.989), daily average triplets around 1.2 % to 3.0 for ultraviolet band less than 2.0 visible infrared bands. Good depth agreement class="inline-formula">R>0.997, 100 within expected error) root mean square error (RMSE) values ranging 0.006 (for 870 nm band) 0.016 440 obtained, relative bias (RMB) 0.922 1.112 ±0.04. maximum deviation peak value fine-mode particles varied about 8.9 77.6 %, whereas variation coarse-mode 13.1 29.1 %. variations single scattering albedo approximately 0.1 %–1.8 0.6 %–1.9 %–2.6 0.8 %–3.5 440, 675, 1020 bands, respectively. For direct forcing, deviations 4.8 %–12.3 obtained at earth's surface 5.4 %–15.9 top atmosphere. In addition, water vapor retrievals showed satisfactory accuracy, characterized by high class="inline-formula">R class="inline-formula">∼0.997), small RMSE class="inline-formula">∼0.020) good distribution (100 error). RMB 0.979, biases mostly class="inline-formula">±0.04, concentrated class="inline-formula">±0.02.

Language: Английский

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