Manual for the GAW Precipitation Chemistry Programme: Guidelines, Data Quality Objectives and Standard Operating Procedures
Abstract
This is a manual for the Global Atmosphere Watch Precipitation Chemistry (GAW-PC) Programme. Where possible, it describes standard operating procedures and otherwise provides guidance on methods and procedures. The objectives of the GAW Precipitation Chemistry Programme are as follows: (1) to assure the harmonization of measurements conducted globally by various regional and national programmes; (2) to enable quantification of patterns and trends in the composition of atmospheric precipitation at global and regional scales; (3) to improve the understanding of biogeochemical cycles of major chemical species; (4) to facilitate global assessments of acid deposition and to investigate long-range transport from major source areas; and (5) to provide the data needed for evaluating the effects of acid deposition on major ecosystems, for example, coastal and sensitive areas, and for developing control measures. To address the first objective and to improve the quality of global data, the GAW-PC Programme has undertaken to revise its standard operating procedures, including all on-site, laboratory, data management and quality assurance aspects of the measurement system. The new procedures documented and presented in these chapters are for major ions in precipitation. The major ions and measurements covered in this manual are as follows: Sulfate, Chloride, Calcium, Conductivity, Nitrate, Sodium, Magnesium, Ammonium, Potassium, and pH. Other provisional measurements include Alkalinity and Organic Acids.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 2004
- Accession Number
- ADA442512
Entities
People
- Mary A. Allan
Organizations
- World Meteorological Organization