Shortwave and longwave radiative forcings of aerosols depending on the vertical stratification of aerosols and clouds

Eiji Oikawa, Kentaroh Suzuki, Teruyuki Nakajima, Tomoaki Nishizawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We investigate four scenarios for estimating shortwave (SW) and longwave (LW) direct aerosol radiative forcing (DARF) at the top of atmosphere (TOA) using the global data set of the vertical distributions for aerosols and clouds of CALIPSO and CloudSat Level 2 products. One scenario is clear-sky (cloud-free) condition and three scenarios are cloudy-sky condition: the case that aerosols exists above clouds (AAC case), and the case that aerosols exist below high clouds such as cirrus, but without clouds below the aerosol layers (ABC case), and the case that aerosols are not observed in cloudy-sky condition. In clear-sky and ABC cases, aerosols mainly scatter sunlight and SWDARFs show negative values, except for bright surfaces, such as desert regions and the North and South Poles. In AAC case, aerosols absorb the reflected light from underlying low-level clouds to TOA, so that SWDARF at TOA shows positive value. Mineral dust absorbs the Earth's radiation and LWDARF indicates strong positive over Saharan and Arabian deserts. The global mean values of SW plus LW DARFs are -2.77, -0.77, and -1.40 Wm-2 under clear-sky, cloudy-sky, and all-sky conditions.

Original languageEnglish
Title of host publicationRadiation Processes in the Atmosphere and Ocean, IRS 2016
Subtitle of host publicationProceedings of the International Radiation Symposium (IRC/IAMAS)
EditorsWerner Schmutz, Roger Davies, Luca Egli
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735414785
DOIs
Publication statusPublished - Feb 22 2017
Externally publishedYes
EventInternational Radiation Symposium 2016: Radiation Processes in the Atmosphere and Ocean, IRS 2016 - Auckland, New Zealand
Duration: Apr 16 2016Apr 22 2016

Publication series

NameAIP Conference Proceedings
Volume1810
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherInternational Radiation Symposium 2016: Radiation Processes in the Atmosphere and Ocean, IRS 2016
CountryNew Zealand
CityAuckland
Period4/16/164/22/16

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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