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| Titel |
Simulation of black carbon aerosol distribution over India: A sensitivity study to different convective schemes |
| VerfasserIn |
Sudipta Ghosh, Sagnik Dey, Sushant Das, Chandra Venkataraman, Nitin U. Patil |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250138210
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| Publikation (Nr.) |
 EGU/EGU2017-1156.pdf |
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| Zusammenfassung |
| Black carbon (BC) aerosols absorb solar radiation, thereby causing a warming at the
top-of-the-atmosphere (TOA) in contrast to most of the other aerosol species that scatter
radiation causing a cooling at TOA. BC is considered to be an important contributor of global
warming, second only to CO2 with a net radiative forcing of 1.1 w/m2. They have important
regional climate effects, because of their spatially non-uniform heating and cooling. So it is
very important to understand the spatio-temporal distribution of BC over India. In this study,
we have used a regional climate model RegCM4.5 to simulate BC distribution over India with
a focus on the BC estimation. The importance of incorporation of regional emission
inventory has been shown and the sensitivity of BC distribution to various convective
schemes in the model has been explored. The model output has been validated with
in-situ observations. It is quite evident that regional inventory is capturing larger
columnar burden of BC and OC than the global inventory. The difference in BC
burden is clear at many places with the largest difference (in the order from 2 x
10−11 kg m−2 sec−1 in global inventory to 4 x 10−11 kg m−2 sec−1 in regional
inventory) being observed over the Indo-Gangetic Basin. This difference is mainly
attributed to the local sources like kerosene lamp burning, residential cooking on solid
biomass fuel and agricultural residue burning etc., that are not considered in the global
inventory. The difference is also noticeable for OC. Thus BC burden has increased with
incorporation of regional emission inventory in the model, suggesting the importance
of regional inventory in improved simulation and estimation of aerosols in this
region. BC distribution is also sensitive to choice of scheme with Emanuel scheme
capturing a comparatively smaller BC burden during the monsoon than Tiedtke scheme.
Further long-term simulation with customized model is required to examine impact of
BC.
Keywords: Black carbon, RegCM4, regional emission inventory, convective schemes. |
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