English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

In this study, vertical profiles and column-integrated aerosol propertiesretrieved by the GRASP (Generalized Retrieval of Atmosphere and SurfaceProperties) algorithm are evaluated with in situ airborne measurements madeduring the ChArMEx-ADRIMED field campaign in summer 2013. In the framework ofthis campaign, two different flights took place over Granada (Spain) during adesert dust episode on 16 and 17 June. The GRASP algorithm, whichcombines lidar and sun–sky photometer data measured at Granada, wasused to retrieve aerosol properties. Two sun-photometer datasets areused: one co-located with the lidar system and the other in the CerroPoyos station, approximately 1200 m higher than the lidar system but at ashort horizontal distance.  Column-integrated aerosol microphysical properties retrieved by GRASP arecompared with AERONET products showing a good agreement. Differences betweenGRASP retrievals and airborne extinction profiles are in the range of 15 to30 %, depending on the instrument on board the aircraft used as reference.On 16 June, a case where the dust layer was coupled to the aerosollayer close to surface, the total volume concentration differences betweenin situ data and GRASP retrieval are 15 and 36 % for Granada and CerroPoyos retrievals, respectively. In contrast, on 17 June thedust layer was decoupled from the aerosol layer close to the surface, and thedifferences are around 17 % for both retrievals. In general, all thediscrepancies found are within the uncertainly limits, showing therobustness and reliability of the GRASP algorithm. However, the better agreementfound for the Cerro Poyos retrieval with the aircraft data and the verticalhomogeneity of certain properties retrieved with GRASP, such as thescattering Ångström exponent, for cases with aerosol layerscharacterized by different aerosol types, shows that uncertainties in thevertical distribution of the aerosol properties have to be considered.  The comparison presented here between GRASP and other algorithms(i.e. AERONET and LIRIC) and with airborne in situ measurements shows thepotential to retrieve the optical and microphysical profiles of theatmospheric aerosol properties. Also, the advantage of GRASP versus LIRIC is that GRASP does not assume the results of the AERONET inversion as a starting point

Comparative assessment of GRASP algorithm for a dust event over Granada (Spain) during ChArMEx-ADRIMED 2013 campaign