Abstract
WRF-Chem and a modified version of the ECLIPSE 5a emission inventory were used to investigate the sources impacting black carbon (BC) deposition to the Himalaya, Karakoram, and Hindu Kush (HKHK) region. This work extends previous studies by simulating deposition to the HKHK region not only under current conditions, but also in the 2040–2050 period under two realistic emission scenarios and in three different phases of the El Niño-Southern Oscillation (ENSO). Under current conditions, sources from outside our South Asian modelling domain have a similar impact on total BC deposition to the HKHK region (35–87%, varying with month) as South Asian anthropogenic sources (13–62%). Industry (primarily brick kilns) and residential solid fuel burning combined account for 45–66% of the in-domain anthropogenic BC deposition to the HKHK region. Under a no further control emission scenario for 2040–2050, the relative contributions to BC deposition in the HKHK region are more skewed toward in-domain anthropogenic sources (45–65%) relative to sources outside the domain (26–52%). The in-domain anthropogenic BC deposition has significant contributions from industry (32–42%), solid fuel burning (17–28%), and diesel fuel burning (17–27%). Under a scenario in which emissions in South Asia are mitigated, the relative cotribution from South Asian anthropogenic sources is significantly reduced to 11–34%. The changes due to phase of ENSO do not seem to follow consistent patterns with ENSO. Future work will use the high-resolution deposition maps developed here to determine the impact of different sources of BC on glacier melt and water availability in the region.
Highlights
The Himalaya, Karakoram, and Hindu Kush (HKHK) mountain ranges run 2,400 km through six nations (India, Pakistan, Afghanistan, China, Bhutan, and Nepal) and contain 60,000 km2 of ice, which is more ice than any other region outside the Poles
The Weather Research and Forecasting model coupled with Chemistry and a modified version of the Evaluating the Climate and Air Quality Impacts of Short-Lived Pollutants (ECLIPSE) 5a emission inventory were used to investigate the sources impacting black carbon (BC) deposition to the Himalaya, Karakoram, and Hindu Kush (HKHK) region
NFC = no further control; MIT = mitigation; ENSO = El Niño–Southern Oscillation; WRFChem = Weather Research and Forecasting model coupled with Chemistry; BC = black carbon
Summary
The Himalaya, Karakoram, and Hindu Kush (HKHK) mountain ranges run 2,400 km through six nations (India, Pakistan, Afghanistan, China, Bhutan, and Nepal) and contain 60,000 km of ice, which is more ice than any other region outside the Poles. Absorbing aerosols—including BC—in northern India during late spring (May–June) might advance rainy periods (Meehl et al, 2008) and decrease late monsoon (July–August) precipitation (Lau & Kim, 2006, 2010; Meehl et al, 2008) In this project, the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem; Grell et al, 2005), a coupled meteorological and chemical transport model (section 2.1) driven with detailed emission inventories (section 2.2), was used to understand the impacts of regional emissions and transport on the wet and dry deposition of BC to the HKHK region under current conditions and under future climate projections for 2040–2050. The data from this study will be used in a companion study to estimate the impact of BC emissions on the current and future albedos of the glaciers in the HKHK region, and the resulting impacts on water resources in South Asia
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