Quantify the atmospheric methyl bromide (CH3Br) sources with boxes models and data from the ground-based measurement stations of global monitoring division (NOAA)
Abstract
Methyl bromide (CH3Br) is believed to the largest natural carrier of atmospheric bromine with long enough lifetime (~0.8 years) to enter into the stratosphere to catalyze the stratospheric ozone depletion. However, its currently identified sources and sinks cannot be balanced to each other with missing sources of about 39 Gg yr-1 (~46% of the identified sources as of 2012) based on the most recent WMO Ozone Assessment report (2018). With 14 ground-based monitoring stations (South Pole, Palmer Station, American Samoa, Mauna Loa, Cape Kumukahi, Niwot Ridge, Trinidad Head, Wisconsin, Harvard Forest, Mace Head, Barrow Alaska, Alert Canada, Summit Greenland), the global monitoring laboratory of National Oceanic and Atmospheric Administration (NOAA) provides a backbone of dataset on monthly averaged atmospheric CH3Br concentrations since 1992. We applied simple boxes model with the data from the monitoring network, and tentatively concluded that (1) the natural emissions account for over 92% of the atmospheric CH3Br budget and are expected to increase; (2) the skewed atmospheric CH3Br profile suggested the existent of significant terrestrial sources between 25-45° N; (3) our modeled CH3Br sources is up to 125.8 Gg as of 2012, with an unidentified source of 41.8 Gg yr-1 in the literature.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.A43P2928D
- Keywords:
-
- 0305 Aerosols and particles;
- ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 0345 Pollution: urban and regional;
- ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 0394 Instruments and techniques;
- ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 3394 Instruments and techniques;
- ATMOSPHERIC PROCESSES