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@ARTICLE{Roy:825118,
author = {Roy, Chaitri and Fadnavis, Suvarna and Müller, Rolf and
Chaudhary, Ayantika Dey and Ploeger, Felix},
title = {{I}nfluence of enhanced {A}sian {NO}$_{x}$ emissions on
ozone in the {U}pper {T}roposphere and {L}ower
{S}tratosphere ({UTLS}) in chemistry climate model
simulations},
journal = {Atmospheric chemistry and physics / Discussions},
volume = {},
issn = {1680-7375},
address = {Katlenburg-Lindau},
publisher = {EGU},
reportid = {FZJ-2016-07595},
pages = {},
year = {2016},
abstract = {Asian summer monsoon convection plays an important role in
efficient vertical transport from the surface to the
anticyclone. In this paper we investigate the potential
impact of convectively transported anthropogenic nitrogen
oxides (NOx) on the distribution of ozone in the Upper
Troposphere and Lower Stratosphere (UTLS) from simulations
with the fully-coupled aerosol chemistry climate model,
ECHAM5-HAMMOZ. We performed anthropogenic NOx emission
sensitivity experiments over India and China. In these
simulations, anthropogenic NOx emissions for the period
2000–2010 have been increased by $38 \%$ over India and
by $73 \%$ over China in accordance with satellite
observed trends over India of $3.8 \%$ per year and China
of $7.3 \%$ per year. These NOx emission sensitivity
simulations show that strong convection over the Bay of
Bengal and the Southern slopes of the Himalayas transports
Indian emissions into the UTLS. Convective transport from
the South China Sea injects Chinese emissions into the lower
stratosphere. Indian and Chinese emissions are partially
transported over the Arabian Sea and west Asia by the
tropical easterly jet. Enhanced NOx emissions over India and
China increase the ozone radiative forcing over India by
0.112 W/m2 and 0.121 W/m2 respectively. These elevated
emissions produces significant warming over the Tibetan
Plateau and increase precipitation over India due to a
strengthening of the monsoon Hadley circulation.However
doubling of NOx emissions over India $(73 \%);$ equal to
China, produced high ozone in the lower troposphere. It
induced a reverse monsoon Hadley circulation and negative
precipitation anomalies over India. The associated
subsidence suppressed vertical transport of NOx and ozone
into the anticyclone.},
cin = {IEK-7},
ddc = {550},
cid = {I:(DE-Juel1)IEK-7-20101013},
pnm = {244 - Composition and dynamics of the upper troposphere and
middle atmosphere (POF3-244)},
pid = {G:(DE-HGF)POF3-244},
typ = {PUB:(DE-HGF)16},
doi = {10.5194/acp-2016-582},
url = {https://juser.fz-juelich.de/record/825118},
}