scholarly journals Cloud Condensation Nuclei Activity of Aerosols during GoAmazon 2014/15 Field Campaign Report

2016 ◽  
Author(s):  
J. Wang ◽  
S. T. Martin ◽  
L. Kleinman ◽  
R. M. Thalman
Keyword(s):  
Cloud Condensation Nuclei ◽  
Condensation Nuclei ◽  
Field Campaign

scholarly journals Measurement report: Altitudinal variation of CCN activation across the Indo-Gangetic Plains prior to monsoon onset and during peak monsoon periods: Results from the SWAAMI field campaign

2020 ◽  
Author(s):  
Mohanan R. Manoj ◽  
Sreedharan K. Satheesh ◽  
Krishnaswamy K. Moorthy ◽  
Jamie Trembath ◽  
Hugh Coe
Keyword(s):  
Cloud Condensation Nuclei ◽  
Active Phase ◽  
Monsoon Onset ◽  
Condensation Nuclei ◽  
Gangetic Plain ◽  
Gangetic Plains ◽  
Field Campaign ◽  
Vertical Distributions ◽  
High Concentrations ◽  
Indo Gangetic Plain

Abstract. Vertical distributions (altitude profiles) of condensation nuclei (CN) and cloud condensation nuclei (CCN) and their spatial variations across the Indo-Gangetic Plain (IGP) have been investigated based on air-borne measurements carried out during the SWAAMI field campaign (June to July, 2016) capturing the contrasting phases of the Indian monsoon activity in 2016; just prior to its onset and during its active phase. Prior to the monsoon onset, high concentrations of CN and CCN prevailed across the IGP and the profiles revealed frequent occurrence of elevated layers (in the altitude range 1–3 km). Highest concentrations and elevated peaks with high values occurred over the central IGP. The scenario changed dramatically during the active phase of the monsoon, when the CN and CCN concentrations dropped (CN by 20 to 30 % and CCN by 6 to 25 %) throughout the IGP with more pronounced changes at altitudes higher than 3 km where decreases as high as > 80 % were observed. These reductions have an east to west decreasing gradient; being most remarkable in the eastern IGP and very weak over the western IGP where the CN concentrations above 3 km increased during the monsoon. The activation ratios (AR) showed contrasting features, increasing with increase in altitude, prior to the onset of monsoon, reversing the trend to decrease with increase in altitude during the active phase of the monsoon. The supersaturation spectrum became flatter during the active phase of the monsoon indicating an increase in the hygroscopicity of aerosols, following the mixing of surface-based emissions with the advected marine airmass.

A Method for Forecasting Cloud Condensation Nuclei Using Predictions of Aerosol Physical and Chemical Properties from WRF/Chem

2011 ◽  
Vol 50 (7) ◽  
pp. 1601-1615 ◽  
Author(s):  
Daniel Ward ◽  
William Cotton
Keyword(s):  
Hydrological Cycle ◽  
Spatial Scales ◽  
Cloud Condensation Nuclei ◽  
Cloud Microphysics ◽  
Atmospheric Modeling ◽  
Number Concentration ◽  
Integrated System ◽  
Condensation Nuclei ◽  
Field Campaign ◽  
Physical And Chemical

AbstractModel investigations of aerosol–cloud interactions across spatial scales are necessary to advance basic understanding of aerosol impacts on climate and the hydrological cycle. Yet these interactions are complex, involving numerous physical and chemical processes. Models capable of combining aerosol dynamics and chemistry with detailed cloud microphysics are recent developments. In this study, predictions of aerosol characteristics from the Weather Research and Forecasting Model with Chemistry (WRF/Chem) are integrated into the Regional Atmospheric Modeling System microphysics package to form the basis of a coupled model that is capable of predicting the evolution of atmospheric aerosols from gas-phase emissions to droplet activation. The new integrated system is evaluated against measurements of cloud condensation nuclei (CCN) from a land-based field campaign and an aircraft-based field campaign in Colorado. The model results show the ability to capture vertical variations in CCN number concentration within an anthropogenic pollution plume. In a remote continental location the model-forecast CCN number concentration exhibits a positive bias that is attributable in part to an overprediction of the aerosol hygroscopicity that results from an underprediction in the organic aerosol mass fraction. In general, the new system for predicting CCN from forecast aerosol fields improves on the existing scheme in which aerosol quantities were user prescribed.

scholarly journals Measurement report: Altitudinal variation of cloud condensation nuclei activation across the Indo-Gangetic Plain prior to monsoon onset and during peak monsoon periods: results from the SWAAMI field campaign

2021 ◽  
Vol 21 (11) ◽  
pp. 8979-8997
Author(s):  
Mohanan R. Manoj ◽  
Sreedharan K. Satheesh ◽  
Krishnaswamy K. Moorthy ◽  
Jamie Trembath ◽  
Hugh Coe
Keyword(s):  
Cloud Condensation Nuclei ◽  
Active Phase ◽  
Monsoon Onset ◽  
Condensation Nuclei ◽  
Gangetic Plain ◽  
Field Campaign ◽  
Airborne Measurements ◽  
Vertical Distributions ◽  
High Concentrations ◽  
Indo Gangetic Plain

Abstract. Vertical distributions (altitude profiles) of condensation nuclei (CN) and cloud condensation nuclei (CCN) and their spatial variations across the Indo-Gangetic Plain (IGP) have been investigated based on airborne measurements carried out during the SWAAMI field campaign (June to July 2016) capturing the contrasting phases of the Indian monsoon activity in 2016 just prior to its onset and during its active phase. Prior to the monsoon onset, high concentrations of CN and CCN prevailed across the IGP, and the profiles revealed frequent occurrence of elevated layers (in the altitude range 1–3 km). Highest concentrations and elevated peaks with high values occurred over the central IGP. The scenario changed dramatically during the active phase of the monsoon, when the CN and CCN concentrations dropped (CN by 20 % to 30 % and CCN by 6 % to 25 %) throughout the IGP with more pronounced changes at altitudes higher than 3 km where decreases as high as > 80 % were observed. These reductions have an east-to-west decreasing gradient, being most remarkable in the eastern IGP and very weak over the western IGP where the CN concentrations above 3 km increased during the monsoon. The activation ratios (ARs) showed contrasting features, increasing with increase in altitude, prior to the onset of monsoon, reversing the trend to decrease with increase in altitude during the active phase of the monsoon. The supersaturation spectrum became flatter during the active phase of the monsoon, indicating an increase in the hygroscopicity of aerosols following the mixing of surface-based emissions with the advected marine air mass.

Impact of urban aerosol properties on cloud condensation nuclei (CCN) activity during the KORUS-AQ field campaign

2018 ◽  
Vol 185 ◽  
pp. 221-236 ◽  
Author(s):  
Najin Kim ◽  
Minsu Park ◽  
Seong Soo Yum ◽  
Jong Sung Park ◽  
Hye Jung Shin ◽  
...  
Keyword(s):  
Cloud Condensation Nuclei ◽  
Urban Aerosol ◽  
Condensation Nuclei ◽  
Field Campaign ◽  
Aerosol Properties ◽  
Ccn Activity

New Directions: The impact of oceanic iron fertilisation on cloud condensation nuclei

2008 ◽  
Vol 42 (22) ◽  
pp. 5728-5730 ◽  
Author(s):  
Matthew T. Woodhouse ◽  
Graham W. Mann ◽  
Kenneth S. Carslaw ◽  
Olivier Boucher
Keyword(s):  
Cloud Condensation Nuclei ◽  
Condensation Nuclei ◽  
New Directions ◽  
The Impact
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