scholarly journals The vertical distribution of ozone instantaneous radiative forcing from satellite and chemistry climate models

2011 ◽  
Vol 116 (D1) ◽  
Author(s):  
A. M. Aghedo ◽  
K. W. Bowman ◽  
H. M. Worden ◽  
S. S. Kulawik ◽  
D. T. Shindell ◽  
...  
Keyword(s):  
Vertical Distribution ◽  
Radiative Forcing ◽  
Climate Models ◽  
The Vertical Distribution

scholarly journals Processes controlling the vertical aerosol distribution in marine stratocumulus regions – a sensitivity study using the climate model NorESM1-M

2021 ◽  
Vol 21 (1) ◽  
pp. 577-595
Author(s):  
Lena Frey ◽  
Frida A.-M. Bender ◽  
Gunilla Svensson
Keyword(s):  
Vertical Distribution ◽  
Radiative Forcing ◽  
Climate Model ◽  
Cloud Microphysics ◽  
Aerosol Extinction ◽  
Shallow Convection ◽  
Marine Stratocumulus ◽  
Aerosol Emission ◽  
Aerosol Distribution ◽  
The Vertical Distribution

Abstract. The vertical distribution of aerosols plays an important role in determining the effective radiative forcing from aerosol–radiation and aerosol–cloud interactions. Here, a number of processes controlling the vertical distribution of aerosol in five subtropical marine stratocumulus regions in the climate model NorESM1-M are investigated, with a focus on the total aerosol extinction. A comparison with satellite lidar data (CALIOP, Cloud–Aerosol Lidar with Orthogonal Polarization) shows that the model underestimates aerosol extinction throughout the troposphere, especially elevated aerosol layers in the two regions where they are seen in observations. It is found that the shape of the vertical aerosol distribution is largely determined by the aerosol emission and removal processes in the model, primarily through the injection height, emitted particle size, and wet scavenging. In addition, the representation of vertical transport related to shallow convection and entrainment is found to be important, whereas alterations in aerosol optical properties and cloud microphysics parameterizations have smaller effects on the vertical aerosol extinction distribution. However, none of the alterations made are sufficient for reproducing the observed vertical distribution of aerosol extinction, neither in magnitude nor in shape. Interpolating the vertical levels of CALIOP to the corresponding model levels leads to better agreement in the boundary layer and highlights the importance of the vertical resolution.

Radiative forcing of climate by changes in the vertical distribution of ozone

1990 ◽  
Vol 95 (D7) ◽  
pp. 9971-9981 ◽  
Author(s):  
Andrew A. Lacis ◽  
Donald J. Wuebbles ◽  
Jennifer A. Logan
Keyword(s):  
Vertical Distribution ◽  
Radiative Forcing ◽  
The Vertical Distribution

scholarly journals Airborne lidar study of the vertical distribution of aerosols over Hyderabad, an urban site in central India, and its implication for radiative forcing calculations

2006 ◽  
Vol 24 (10) ◽  
pp. 2461-2470 ◽  
Author(s):  
H. Gadhavi ◽  
A. Jayaraman
Keyword(s):  
Vertical Distribution ◽  
Radiative Forcing ◽  
Central India ◽  
Airborne Lidar ◽  
Urban Site ◽  
Transfer Model ◽  
Aerosol Extinction ◽  
Vertical Profiles ◽  
Flight Duration ◽  
The Vertical Distribution

Abstract. Use of a compact, low power commercial lidar onboard a small aircraft for aerosol studies is demonstrated. A Micro Pulse Lidar fitted upside down in a Beech Superking aircraft is used to measure the vertical distribution of aerosols in and around Hyderabad, an urban location in the central India. Two sorties were made, one on 17 February 2004 evening hours and the other on 18 February 2004 morning hours for a total flight duration of four hours. Three different algorithms, proposed by Klett (1985), Stephens et al. (2001) and Palm et al. (2002) for deriving the aerosol extinction coefficient profile from lidar data are studied and is shown that the results obtained from the three methods compare within 2%. The result obtained from the airborne lidar is shown more useful to study the aerosol distribution in the free troposphere than that obtained by using the same lidar from ground. Using standard radiative transfer model the aerosol radiative forcing is calculated and is shown that knowledge on the vertical distribution of aerosols is very important to get more realistic values than using model vertical profiles of aerosols. We show that for the same aerosol optical depth, single scattering albedo and asymmetry parameter but for different vertical profiles of aerosol extinction the computed forcing values differ with increasing altitude and improper selection of the vertical profile can even flip the sign of the forcing at tropopause level.

scholarly journals Changes and Predictions of Vertical Distributions of Global Light-Absorbing Aerosols Based on CALIPSO Observation

2020 ◽  
Vol 12 (18) ◽  
pp. 3014
Author(s):  
Zigeng Song ◽  
Xianqiang He ◽  
Yan Bai ◽  
Difeng Wang ◽  
Zengzhou Hao ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Vertical Distribution ◽  
Satellite Remote Sensing ◽  
Radiative Forcing ◽  
Prediction Models ◽  
Atmospheric Correction ◽  
Satellite Measurement ◽  
Vertical Distributions ◽  
Absorbing Aerosols ◽  
The Vertical Distribution

Knowledge of the vertical distribution of absorbing aerosols is crucial for radiative forcing assessment, and its quasi real-time prediction is one of the keys for the atmospheric correction of satellite remote sensing. In this study, we investigated the seasonal and interannual changes of the vertical distribution of global absorbing aerosols based on satellite measurement from the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) and proposed a neural network (NN) model to predict the vertical distribution of global absorbing aerosols. Gaussian fitting was proposed to derive the maximum fitted particle number concentration (MFNC), altitude corresponding to MFNC (MFA), and standard deviation (MFASD) for vertical distribution of dust and smoke aerosols. Results showed that higher MFA values of dust and smoke aerosols mainly occurred over deserts and tropical savannas, respectively. For dust aerosol, the MFA is mainly observed at 0.5 to 6 km above deserts, and low MFNC values occur in boreal spring and winter while high values in summer and autumn. The MFA of smoke is systematically lower than that of dust, ranging from 0.5 to 3.5 km over tropical rainforest and grassland. Moreover, we found that the MFA of global dust and smoke had decreased by 2.7 m yr−1 (statistical significance p = 0.02) and 1.7 m yr−1 (p = 0.02) over 2007–2016, respectively. The MFNC of global dust has increased by 0.63 cm−3 yr−1 (p = 0.05), whereas that of smoke has decreased by 0.12 cm−3 yr−1 (p = 0.05). In addition, the determination coefficient (R2) of the established prediction models for vertical distributions of absorbing aerosols were larger than 0.76 with root mean square error (RMSE) less than 1.42 cm−3, which should be helpful for the radiative forcing evaluation and atmospheric correction of satellite remote sensing.

scholarly journals Investigating processes that control the vertical distribution of aerosol in five subtropical marine stratocumulus regions – A sensitivity study using the climate model NorESM1-M

2019 ◽  
Author(s):  
Lena Frey ◽  
Frida A.-M. Bender ◽  
Gunilla Svensson
Keyword(s):  
Vertical Distribution ◽  
Radiative Forcing ◽  
Climate Model ◽  
Sensitivity Study ◽  
Cloud Microphysics ◽  
Orthogonal Polarization ◽  
Aerosol Extinction ◽  
Shallow Convection ◽  
Marine Stratocumulus ◽  
The Vertical Distribution

Abstract. The vertical distribution of aerosols plays an important role in determining the effective radiative forcing from aerosol–radiation and aerosol–cloud interactions. Here, a number of processes controlling the vertical distribution of aerosol in five subtropical marine stratocumulus regions in the climate model NorESM1-M are investigated, with a focus on the total aerosol extinction. A comparison with satellite lidar data (CALIOP, Cloud-Aerosol Lidar with Orthogonal Polarization) shows that the model underestimates aerosol extinction throughout the troposphere, especially elevated aerosol layers in the two regions where they are seen in observations. It is found that the shape of the vertical aerosol distribution is largely determined by the aerosol emissions and removal processes in the model, primarily through the injection height, emitted particle size, and wet scavenging. In addition, the representation of vertical transport related to shallow convection and entrainment are found to be important, whereas alterations in aerosol optical properties and cloud microphysics parameterizations have smaller effects on the vertical aerosol extinction distribution. However, none of the alterations made are sufficient for reproducing the observed vertical distribution of aerosol extinction, neither in magnitude nor in shape. Interpolating the vertical levels of CALIOP to the corresponding model levels, leads to a better agreement in the boundary layer and highlights the importance of the vertical resolution.

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