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Reactive halogens and their measurements in the troposphere

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Title Reactive halogens and their measurements in the troposphere
 
Creator Sahu, Lokesh Kumar
 
Subject Halogens
Reaction
Radical
Tropical
India
Ozone
Photochemistry
 
Description 1615-1622
In the earth-ocean-atmosphere system, the halogenated species take part
in the cycles of several key processes involving both gas and heterogeneous interactions.
The atmospheric cycles of reactive halogens are very complex specifically for
those emitted from natural sources. As far as their roles in the tropospheric
chemistry, the halogen compounds particularly those containing bromine (Br) and
chlorine (Cl) play key roles. The reaction rate constants of many trace gases
with halogen radicals are faster than those with hydroxyl radicals (OH). Near
the source regions, however, halogen radicals can greatly influence the
oxidizing capacity of the troposphere due to their reactive behaviors. In the
lower troposphere, particularly in the marine boundary layer (MBL) and polar
boundary layer, the reactive halogen compounds cause substantial destruction of
ozone. The in-situ observations are available only for very limited geographical
regions mainly in the mid- and high- latitudes of the northern hemisphere. One
of the reasons for the lack of studies could be the technological constraint
owing to very reactive nature of halogens hence the uncertainty in detection
and quantification. Nonetheless, it is imperative to study the photochemistry of
halogens in global troposphere for the better understanding of
chemistry-climate interactions. Many theoretical aspects related to photochemistry
of halogenated species in the troposphere need to be verified by the
observations. Present study highlighted recent scientific progress about the roles
of reactive halogens and their measurements in the troposphere. In spite of greater
scientific opportunities in atmospheric studies of halogens, study over Indian
subcontinent and surrounding marine regions are almost nil.
 
Date 2016-06-27T09:17:07Z
2016-06-27T09:17:07Z
2014-09
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/34466
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.43(9) [September 2014]