Radiative forcing and temperature effects of anthropogenic aerosols over Southeast Asia

Date of Award

2018

Document Type

Thesis

Degree Name

Master of Science in Atmospheric Science

Department

Physics

First Advisor

Narisma, Gemma Teresa T., Ph.D.

Abstract

The radiative forcing and temperature effects of anthropogenic aerosols (carbonaceous and sulfur) were investigated over Southeast Asia. The simulations are carried out using RegCM4.5 coupled with an aerosol model for a one year period from January 2005 to December 2005. From the 5 emission inventories that were compared and characterized, IIASA, MACCity and REAS were chosen as aerosol input for each experimental run. The control run (without aerosols) is then validated with observed temperature from APHRODITE. The sensitivity of the experimental runs to the emissions inventories was analyzed.Anthropogenic aerosols induced a positive and negative radiative forcing at the top of atmosphere (TOA) and surface over Southeast Asia. The positive (negative) forcing corresponded to a surface warming (cooling) over land. The cumulative direct, indirect and semi-direct effects of aerosols are crucial to the geographical distribution of radiative forcing. July-August-September-October (JASO) ensemble results found slight cooling (-0.1oC to -0.2oC) over Visayas and is statistically significant at 90% confidence level.

Comments

The A7.L546 2018

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