Clouds and aerosols in Puerto Rico - A new evaluation

J. D. Allan, D. Baumgardner, G. B. Raga, O. L. Mayol-Bracero, F. Morales-García, F. García-García, G. Montero-Martínez, S. Borrmann, J. Schneider, S. Mertes, S. Walter, M. Gysel, U. Dusek, G. P. Frank, M. Krämer

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The influence of aerosols, both natural and anthropogenic, remains a major area of uncertainty when predicting the properties and behaviour of clouds and their influence on climate. In an attempt to better understand warm cloud formation in a tropical marine environment, a period of intensive measurements took place in December 2004 in Puerto Rico, using some of the latest developments in online instrumentation such as aerosol mass spectrometers, cloud condensation nuclei counters and a hygroscopicity tandem differential mobility analyser. Simultaneous online measurements of aerosol size distributions, composition, hygroscopicity and optical properties were made near the lighthouse of Cape San Juan in the north-eastern corner of the island and at the top of East Peak mountain (1040 m a.s.l.), the two sites separated by 17km. Additional measurements of the cloud droplet residual and interstitial aerosol properties were made at the mountain site, accompanied by measurements of cloud droplet size distributions, liquid water content and the chemical composition of cloud and rain water samples. Both aerosol composition and cloud properties were found to be sensitive to wind sector. Air from the east-northeast (ENE) was mostly free of anthropogenic influences, the submicron fraction being mainly composed of non-sea salt sulphate, while that from the east-southeast (ESE) was found to be moderately influenced by populated islands upwind, adding smaller (
    Original languageEnglish
    Pages (from-to)1293-1309
    Number of pages16
    JournalAtmospheric Chemistry and Physics
    Volume8
    Issue number5
    DOIs
    Publication statusPublished - 2008

    Keywords

    • HYGROSCOPICITY MODEL FRAMEWORK
    • CONDENSATION NUCLEI COUNTER
    • GREAT DUN
    • FELL
    • ORGANIC AEROSOLS
    • MASS-SPECTROMETER
    • CHEMICAL-COMPOSITION
    • DROPLET ACTIVATION
    • LIGHT-ABSORPTION
    • CCN COUNTER
    • TRADE WINDS

    Fingerprint

    Dive into the research topics of 'Clouds and aerosols in Puerto Rico - A new evaluation'. Together they form a unique fingerprint.

    Cite this