First detection of ammonia (NH3) in the Asian summer monsoon upper troposphere
Item
Title (Dublin Core)
First detection of ammonia (NH3) in the Asian summer monsoon upper troposphere
Description (Dublin Core)
Ammonia (NH<sub>3</sub>) has been detected in the upper troposphere by the analysis of averaged MIPAS (Michelson Interferometer for Passive Atmospheric Sounding) infrared limb-emission spectra. We have found enhanced amounts of NH<sub>3</sub> within the region of the Asian summer monsoon at 12–15 km altitude. Three-monthly, 10° longitude × 10° latitude average profiles reaching maximum mixing ratios of around 30 pptv in this altitude range have been retrieved, with a vertical resolution of 3–8 km and estimated errors of about 5 pptv. These observations show that loss processes during transport from the boundary layer to the upper troposphere within the Asian monsoon do not deplete the air entirely of NH<sub>3</sub>. Thus, ammonia might contribute to the so-called Asian tropopause aerosol layer by the formation of ammonium aerosol particles. On a global scale, outside the monsoon area and during different seasons, we could not detect enhanced values of NH<sub>3</sub> above the actual detection limit of about 3–5 pptv. This upper bound helps to constrain global model simulations.
Creator (Dublin Core)
Höpfner, Michael
Volkamer, Rainer
Grabowski, Udo
Grutter, Michel
Orphal, Johannes
Stiller, Gabriele
Clarmann, Thomas
Wetzel, Gerald
Date (Dublin Core)
2018-09-12
Type (Dublin Core)
info:eu-repo/semantics/Text
Format (Dublin Core)
info:eu-repo/semantics/application/pdf
Identifier (Dublin Core)
10.5194/acp-16-14357-2016
https://acp.copernicus.org/articles/16/14357/2016/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
Relation (Dublin Core)
info:eu-repo/grantAgreement/EC/FP7/603557
Rights (Dublin Core)
info:eu-repo/semantics/openAccess
