This document provides comprehensive guidance on ensuring time series consistency in national greenhouse gas inventories, as outlined in the 2006 IPCC Guidelines. The primary objective is to offer best practices for maintaining consistent and accurate emission estimates over time, which is crucial for tracking historical emission trends and evaluating the effectiveness of emission reduction strategies at the national level. Readers will find answers to key questions such as how to handle recalculations due to methodological changes, how to add new categories to the inventory, and how to address data gaps. The document also delves into techniques for splicing different methods or data sets to ensure a complete and consistent time series, and it provides guidance on reporting and documenting trend information. By the end of this document, readers will understand the importance of using consistent methods and data sources across all years in a time series to avoid biases. They will also learn about various techniques for dealing with incomplete or missing data, such as the overlap method, surrogate data, interpolation, and trend extrapolation. Additionally, the document emphasizes the importance of quality assurance and quality control (QA/QC) in maintaining the integrity of the time series. This introduction aims to help readers decide whether the document meets their needs for understanding and implementing time series consistency in greenhouse gas inventories. If you are involved in compiling or reviewing national greenhouse gas inventories, this document will be an invaluable resource for ensuring the accuracy and reliability of your emission estimates over time.
time series consistency greenhouse gas inventory methodological changes recalculations data gaps reporting and documentation quality assurance quality control emission factors technological change splicing techniques surrogate data interpolation trend extrapolation emissions trends national inventory activity data emission/removal estimates afolu sector ipcc guidelines mitigation activities data availability non-calendar year data overlap method statistical data source emissions monitoring inventory capacity transparency emissions reductions environmental statistics data collection methods
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