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Martelo works in Caracas in a research center attached to the Directorate for Hydrology and Meteorology of the Ministry of Environment and Natural Resources. Extreme weather events are a focus of her work.
Due to her research, Martelo was appointed to the Intergovernmental Panel on Climate Change. In 2007, as vice-chair of Working Group I: The Physical Science Basis of Climate Change, she was involved in the creation of the IPCC Fourth Assessment Report. In early 2007 she was replaced at the IPCC by Dr. Miriam Diaz, the new appointee by the Government of Venezuela.
- "IPCC Workshop on Changes in Extreme Weather and Climate Events: Workshop Report" (PDF). INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE. Beijing. 11–13 June 2002. Archived from the original (PDF) on 16 October 2005. Retrieved 5 April 2021.
- "IPCC AR4 WGI Organization". Intergovernmental Panel on Climate Change. 16 January 2008. Archived from the original on 9 May 2008. Retrieved 5 April 2021.
- "REPLACEMENT OF A MEMBER OF THE IPCC BUREAU" (PDF). INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE. 4 May 2007. Archived from the original (PDF) on 13 July 2007. Retrieved 5 April 2021.