Investigation of spectral dependence of shortwave radiation absorption by ambient aerosol using time-resolved photoacoustic technique

2005 ◽  
Vol 44 (7) ◽  
pp. 071203 ◽  
Author(s):  
Alexey B. Tikhomirov
Keyword(s):  
Spectral Dependence ◽  
Shortwave Radiation ◽  
Radiation Absorption ◽  
Photoacoustic Technique ◽  
Time Resolved ◽  
Ambient Aerosol

Spectral dependence of time-resolved photoreflectance of InN epitaxial films

2009 ◽  
Vol 95 (14) ◽  
pp. 142108 ◽  
Author(s):  
Tsong-Ru Tsai ◽  
Cheng-Yu Chang ◽  
Chih-Wei Kuo ◽  
Jih-Shang Hwang ◽  
Tai-Yuan Lin ◽  
...  
Keyword(s):  
Spectral Dependence ◽  
Epitaxial Films ◽  
Time Resolved

scholarly journals Impacts of Aerosol Shortwave Radiation Absorption on the Dynamics of an Idealized Convective Atmospheric Boundary Layer

2013 ◽  
Vol 148 (1) ◽  
pp. 31-49 ◽  
Author(s):  
E. Barbaro ◽  
J. Vilà-Guerau de Arellano ◽  
M. C. Krol ◽  
A. A. M. Holtslag
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Shortwave Radiation ◽  
Radiation Absorption

scholarly journals Radiative effect and climate impacts of brown carbon with the Community Atmosphere Model (CAM5)

2018 ◽  
Vol 18 (24) ◽  
pp. 17745-17768 ◽  
Author(s):  
Hunter Brown ◽  
Xiaohong Liu ◽  
Yan Feng ◽  
Yiquan Jiang ◽  
Mingxuan Wu ◽  
...  
Keyword(s):  
Model Comparison ◽  
Climate Impacts ◽  
Shortwave Radiation ◽  
The Arctic ◽  
Radiation Absorption ◽  
Radiative Effect ◽  
Radiative Effects ◽  
Brown Carbon ◽  
Community Atmosphere Model ◽  
Atmosphere Model

Abstract. A recent development in the representation of aerosols in climate models is the realization that some components of organic aerosol (OA), emitted from biomass and biofuel burning, can have a significant contribution to shortwave radiation absorption in the atmosphere. The absorbing fraction of OA is referred to as brown carbon (BrC). This study introduces one of the first implementations of BrC into the Community Atmosphere Model version 5 (CAM5), using a parameterization for BrC absorptivity described in Saleh et al. (2014). Nine-year experiments are run (2003–2011) with prescribed emissions and sea surface temperatures to analyze the effect of BrC in the atmosphere. Model validation is conducted via model comparison to single-scatter albedo and aerosol optical depth from the Aerosol Robotic Network (AERONET). This comparison reveals a model underestimation of single scattering albedo (SSA) in biomass burning regions for both default and BrC model runs, while a comparison between AERONET and the model absorption Ångström exponent shows a marked improvement with BrC implementation. Global annual average radiative effects are calculated due to aerosol–radiation interaction (REari; 0.13±0.01 W m−2) and aerosol–cloud interaction (REaci; 0.01±0.04 W m−2). REari is similar to other studies' estimations of BrC direct radiative effect, while REaci indicates a global reduction in low clouds due to the BrC semi-direct effect. The mechanisms for these physical changes are investigated and found to correspond with changes in global circulation patterns. Comparisons of BrC implementation approaches find that this implementation predicts a lower BrC REari in the Arctic regions than previous studies with CAM5. Implementation of BrC bleaching effect shows a significant reduction in REari (0.06±0.008 W m−2). Also, variations in OA density can lead to differences in REari and REaci, indicating the importance of specifying this property when estimating the BrC radiative effects and when comparing similar studies.

scholarly journals What would have happened to the ozone layer if chlorofluorocarbons (CFCs) had not been regulated?

2009 ◽  
Vol 9 (6) ◽  
pp. 2113-2128 ◽  
Author(s):  
P. A. Newman ◽  
L. D. Oman ◽  
A. R. Douglass ◽  
E. L. Fleming ◽  
S. M. Frith ◽  
...  
Keyword(s):  
Science Research ◽  
Ozone Hole ◽  
Shortwave Radiation ◽  
Radiation Absorption ◽  
Large Temperature ◽  
Radiation Chemical ◽  
Northern Summer ◽  
Antarctic Ozone ◽  
The Antarctic ◽  
Antarctic Ozone Hole

Abstract. Ozone depletion by chlorofluorocarbons (CFCs) was first proposed by Molina and Rowland in their 1974 Nature paper. Since that time, the scientific connection between ozone losses and CFCs and other ozone depleting substances (ODSs) has been firmly established with laboratory measurements, atmospheric observations, and modeling studies. This science research led to the implementation of international agreements that largely stopped the production of ODSs. In this study we use a fully-coupled radiation-chemical-dynamical model to simulate a future world where ODSs were never regulated and ODS production grew at an annual rate of 3%. In this "world avoided" simulation, 17% of the globally-averaged column ozone is destroyed by 2020, and 67% is destroyed by 2065 in comparison to 1980. Large ozone depletions in the polar region become year-round rather than just seasonal as is currently observed in the Antarctic ozone hole. Very large temperature decreases are observed in response to circulation changes and decreased shortwave radiation absorption by ozone. Ozone levels in the tropical lower stratosphere remain constant until about 2053 and then collapse to near zero by 2058 as a result of heterogeneous chemical processes (as currently observed in the Antarctic ozone hole). The tropical cooling that triggers the ozone collapse is caused by an increase of the tropical upwelling. In response to ozone changes, ultraviolet radiation increases, more than doubling the erythemal radiation in the northern summer midlatitudes by 2060.

scholarly journals Aplicación de la técnica fotoacústica resuelta en tiempo al monitoreo de la fotosíntesis en plantas de lirio acuático (Eichhornia Crassipes)

Respuestas ◽  
2016 ◽  
Vol 13 (1) ◽  
pp. 5-12
Author(s):  
Ana Leticia Cardona-Gomez ◽  
Ricardo Abdelarrague-Serrano ◽  
Gabriel Peña-Rodríguez ◽  
Ernesto Marín-Moares ◽  
Jose Antonio Calderon-Arenas
Keyword(s):  
Energy Storage ◽  
Oxygen Evolution ◽  
Water Hyacinth ◽  
Eichhornia Crassipes ◽  
Aquatic Vegetation ◽  
Photosynthetic Oxygen Evolution ◽  
Photoacoustic Technique ◽  
Time Resolved ◽  
Palabras Clave ◽  
Photosynthetic Oxygen

Reportamos el uso de la técnica fotoacústica resuelta en tiempo en el análisis de la evolución de oxígeno fotosintético y el almacenamiento de energía en plantas verdes. Presentamos una aplicación de esta técnica al monitoreo de la fotosíntesis en la maleza acuática llamada comúnmente lirio acuático o jacinto de agua (Eichhornia Crassipes).Palabras Clave: Fotosíntesis; técnica fotoacústica; lirio acuáticoAbstractWe reported about the use of the time resolved photoacoustic technique for the analysis of the photosynthetic oxygen evolution and the energy storage in green plants. We present an application of this technique to the study of the photosynthesis in the aquatic vegetation, usually called aquatic lirium or water hyacinth (Eichhornia Crassipes). Keywords: Photosynthesis, photoacoustic technique, water hyacinth.

scholarly journals On shortwave radiation absorption in overcast atmospheres

1999 ◽  
Vol 104 (D18) ◽  
pp. 22233-22241 ◽  
Author(s):  
K. K. Fung ◽  
V. Ramaswamy
Keyword(s):  
Shortwave Radiation ◽  
Radiation Absorption
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