Dataset: Six years of surface remote sensing of stratiform warm clouds in marine and continental air over Mace Head, Ireland

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Resource or Project Abstract

A synergistic combination of long-term remote-sensing and in-situ observations was used to investigate the impact of both natural marine and anthropogenic aerosols on clouds and cloud optical properties. Homogeneous single-layer non-precipitating water clouds were carefully selected from a data base spanning more than six years. This comprehensive study of 118 cloud cases with a total of more than 18,000 data points (time steps) can be considered as statistically representative. The results confirm the theory and previous findings of an increase of cloud droplet number concentration (CDNC) and decrease of cloud droplet effective radius with increasing pollution. The cloud optical thickness (COT) and albedo were lower in cleaner air masses and higher in more polluted conditions.
The quantification of aerosols in terms of particle extinction coefficient and mass concentration could not be realised as originally proposed, due to problems with the newly purchased Raman lidar. Ceilometer data was used instead to quantify aerosols within limitations and under large uncertainties.
In-situ data from AMS (aerosol mass spectrometer), SMPS (scanning mobility particle sizer), APS (aerodynamic particle sizer), ACSM (aerosol chemical speciation monitor) and TEOM (tapered element oscillating microbalance) were used in an attempt to quantify the aerosol indirect effect on microphysical cloud properties, instead of the initially proposed Raman lidar data. In order to verify the representativeness of the aerosol concentration levels near the surface for the aerosol concentrations at cloud altitudes, these observations were combined with back-trajectories.
Improvement of the aerosol quantification using ground-based remote sensing at Mace Head is strongly recommended for a better understanding of the impact of aerosols on cloud properties in the future. Continued work on the SYSOC algorithm to reduce the uncertainties is recommended as well.

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Contact Information for This Resource

Dr. Jana Prei▀ler
Ryan Institute?s Centre for Climate and Air Pollution Studies, and Marine Renewable Energy Ireland

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Att 1    EPA_SAFER_118-cloud-cases.zip   (34.2 Mb)

Suggested Citation Information

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Author(s)Prei▀ler, J.
Title Of WebsiteSecure Archive For Environmental Research Data
Publication InformationDataset: Six years of surface remote sensing of stratiform warm clouds in marine and continental air over Mace Head, Ireland
Name of OrganisationEnvironmental Protection Agency Ireland
Electronic Address or URL http://erc.epa.ie/safer/resource?id=ec8cfad2-d3a0-11e8-9a31-005056ae0019
Unique Identifierec8cfad2-d3a0-11e8-9a31-005056ae0019
Date of AccessLast Updated on SAFER: 2018-11-15

An example of this citation in proper usage:

Prei▀ler, J.   "Dataset: Six years of surface remote sensing of stratiform warm clouds in marine and continental air over Mace Head, Ireland". Associated datasets and digitial information objects connected to this resource are available at: Secure Archive For Environmental Research Data (SAFER) managed by Environmental Protection Agency Ireland http://erc.epa.ie/safer/resource?id=ec8cfad2-d3a0-11e8-9a31-005056ae0019 (Last Accessed: 2018-11-15)

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Access Information For This Resource

SAFER-Data Display URL http://erc.epa.ie/safer/iso19115/display?isoID=3162
Resource Keywordsmicrophysical and optical properties of stratiform liquid water clouds, impact of air mass transport on cloud properties, cloud characterization using a large data set
EPA/ERTDI/STRIVE Project Code2012-CCRP-FS.13
EPA/ERTDI/STRIVE Project ThemeClimate Change
Resource Availability: Any User Can Download Files From This Resource
Public-Open
Limitations on the use of this ResourceNONE
Number of Attached Files (Publicly and Openly Available for Download): 1
Project Start Date Tuesday 14th May 2013 (14-05-2013)
Earliest Recorded Date within any attached datasets or digital objects Monday 23rd February 2009 (23-02-2009)
Most Recent Recorded Date within any attached datasets or digital objects Sunday 22nd March 2015 (22-03-2015)
Published on SAFERFriday 19th October 2018 (19-10-2018)
Date of Last EditFriday 19th October 2018 at 14:22:01 (19-10-2018)
Datasets or Files Updated On Friday 19th October 2018 at 14:22:01 (19-10-2018)

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Geographical and Spatial Information Related To This Resource

Description of Geographical Characteristics of This Project or Dataset
The Atmospheric Research Station Mace Head is located in Carna, Co. Galway, on the west coast of Ireland. The remote sensing division at Mace Head (53.33∘N, 9.90∘W) is located 21 m above sea level, about 300 m from the water line.

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Supplementary Information About This Resource

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Lineage information about this project or dataset
The motivation of this project was that aerosol-cloud interactions still represent the largest uncertainty in ascertaining the global radiation budget according to the IPCC 4th Assessment Report (AR4, 2007). Therefore, the overall objective was to reduce the uncertainty of the impact of both natural marine and anthropogenic aerosols on clouds and cloud optical properties using long-term observations and synergetic in-situ and remote-sensing techniques.
Related European projects are Cloudnet, part of the European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases ACTRIS and ACTRIS-2 (grant agreement numbers 262254 and 654109), European FP7 collaborative project BACCHUS (Impact of Biogenic versus Anthropogenic emissions on Clouds and Climate: towards a Holistic UnderStanding, grant agreement number 603445), and COST action ES1303: TOPROF (Towards operational ground based profiling with ceilometers, doppler lidars and microwave radiometers for improving weather forecasts) supported by COST (European Cooperation in Science and Technology).
Supplementary Information
Data were used for the following publication:
Prei▀ler, J., et al. (2016), Six years of surface remote sensing of stratiform warm clouds in marine and continental air over Mace Head, Ireland, J. Geophys. Res. Atmos., 121, 14,538?14,557, doi:10.1002/2016JD025360.

Data sets contain geometrical and microphysical cloud parameters, namely the following:
- cloud base and cloud top
- liquid water path
- cloud optical depth and cloud albedo
- profiles of cloud radar reflectivity
- profiles of cloud temperature
- profiles of vertical velocity with the cloud
- profiles of cloud droplet number concentration and uncertainties
- profiles of cloud droplet effective radius and uncertainties
- profiles of liquid water content and uncertainties
- profiles of cloud subadiabaticity
- size distribution of cloud droplets

Those parameters are available for non-precipitating, homogeneous, single-layer liquid water clouds observed at Mace Head in the period 2009 to 2015.

Required equipment are colocated cloud radar, ceilometer and microwave radiometer.

Remote Sensing at Mace Head benefits from involvement in Cloudnet; European Research Infrastructure for the observation of Aerosol, Clouds, and Trace gases ACTRIS and ACTRIS-2 (grant agreement numbers 262254 and 654109); European FP7 collaborative project BACCHUS (Impact of Biogenic versus Anthropogenic emissions on Clouds and Climate: towards a Holistic UnderStanding, grant agreement number 603445); and COST action ES1303: TOPROF (Towards operational ground based profiling with ceilometers, doppler lidars and microwave radiometers for improving weather forecasts) supported by COST (European Cooperation in Science and Technology).
Links To Other Related Resources
  https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2016JD025360 (Opens in a new window)
  https://zenodo.org/record/154137 (Opens in a new window)

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