 Complete the following phrase:  He was also a contributing author of the third TAR and fourth AR4 Intergovernmental Panel on Climate Change IPCC assessment reports. According to the Principles Governing IPCC Work, the function of contributing authors is to prepare technical information in the form of text, graphs or data for assimilation by the Lead Authors into the draft section. They are part of the author team that bears a collectively required to critically assess information they would like to include from any source and this applies both to IPCC Reports and to papers undergoing the publication process in peer-reviewed journals. Along with Bill Gutowski and Gene Takle, Arritt was one of three Iowa State faculty who contributed to AR4, which led to the IPCC sharing the 