Certificate and Achievements
Achievement:The Aethalometer intercomparison was conducted at the Indian Institute of Science (IISc) in April 2017 with 41 instruments from the ARFI network. The aim was to determine initial state of the Instruments, to provide service and maintenance, and confirm operation conforming to the technical And operational requirements after service. Serviced instruments were compared to determine the Difference between different instrument types. The initial intercomparison of the instruments showed that the majority of the instruments are Non-conforming to the operational requirements. The main reasons were: instrument age, Insufficient maintenance and flow calibration. For the Aethalometer AE33, the results of quality Control tests were indicative of the instrument performance. After service, the instruments Performed in line with the operational requirements with most of the units having BC data within 10% of the reference instrument. When comparing different types of instruments the legacy (AE31, AE42) data needed to be Compensated for the filter loading effect. For the post-processed data, we observed the regression Slope around 0.9 between legacy instruments and the reference AE33. To keep the instrument performance achieved after finishing the intercomparison campaign, Instruments need to be maintained regularly. Special SOP-s have been proposed for Indian networks. These SOP-s have been presented to the operators at the end of the intercomparison and are included in this report.
Achievement: System of Aerosol Monitoring And Research (SAMAR) which is a network of 16 Aethalometers (IMD Network)
Achievement:In 2015 Aethalometers AE33 were installed for Wadia institute of Himalayan Glaciarology in Dehradoon, India. Two sites – Bhojwasa (3,800 mts MSL) and Chirbasa (3600 mts MSL) near Gangotri are run by Dr. P.S. Negi. Dokriani site (3900 mts MSL) in Bhagirathi basin is run by Dr. D.P. Dobhal. The sites are measuring Black Carbon aerosols using Aethalometers AE33. Main sources on these sites are bio mass burning and transported aerosols. Gangotri town has the a lot of diesel generators, which could also be a potential source in Bhojwasa and Chirbasa sites. The aim of these studies is long term measuring of Black Carbon in Himalayan region, to study the Glacier melting and climate change. Sites have access two times in a year. There is no internet available at site: data is saved on Aethalometer AE 33, collected when visiting the sites and brought back to WIHG Dehradoon for analysis. The autonomy of the site was a big challenge. The whole set up, including Aethalometer AE33 and Co2 sensor, is kept inside a special IP65 boxes which were insulated by M&G using PE foam sheets from inside to keep the electronics warm. This whole set was put inside a hut to protect from rain and snow.