Journal
JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN
Volume 99, Issue 2, Pages 287-308Publisher
METEOROLOGICAL SOC JAPAN
DOI: 10.2151/jmsj.2021-014
Keywords
black carbon; Arctic transport; low-pressure systems; transport model
Categories
Funding
- FLAGSHIP2020 within priority study 4 (Advancement of meteorological and global environmental predictions utilizing observational Big Data) of the Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Program for Promoting Researches on the Supercomputer Fugaku (Large Ensemble Atmospheric and Environmental Prediction for Disaster Prevention and Mitigation) of the Ministry of Education, Culture, Sports, Science and Technology (MEXT) [JPMXP1020351142]
- Arctic Challenge for Sustainability Project of MEXT
- JSPS KAKENHI [JP20K12155]
- K computer at the RIKEN Center for Computational Science through the HPCI System Research project [hp160231, hp170232, hp180181, hp190151]
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The atmospheric transport of aerosols, such as black carbon, has a significant impact on the Arctic region, affecting solar radiation, precipitation, and snow/ice cover. The study evaluated the resolution dependency of simulated black carbon transport from Siberia to the Arctic using a model, and found that the transport to the Arctic in September is enhanced by well-developed low-pressure systems. Results suggest that finer horizontal resolutions models are more effective in enhancing material transport processes to the Arctic through these low-pressure systems compared to coarser resolutions.
Atmospheric transport of aerosols such as black carbon (BC) affects the absorption/scattering of solar radiation, precipitation, and snow/ice cover, especially in areas of low human activity such as the Arctic. The resolution dependency of simulated BC transport from Siberia to the Arctic, related to the well-developed low-pressure systems in September, was evaluated using the Nonhydrostatic Icosahedral Atmospheric Model-Spectral Radiation Transport Model for Aerosol Species (NICAM-SPRINTARS) with fine (similar to 56 km) and coarse (similar to 220 km) horizontal resolutions. These low-pressure systems have a large horizontal scale (similar to 2000 km) with the well-developed central pressure located on the transport pathway from East Asia to the Arctic through Siberia. In recent years, the events analysis of the most developed low-pressure system indicated that the high-BC area in the Bering Sea observed by the Japanese research vessel Mirai on September 26 - 27, 2016, moved to the Arctic with a filamental structure from the low's center to the behind of the cold front and ahead of the warm front in relation to its ascending motion on September 27 - 28, 2016. The composite analysis for the developed low-pressure events in September from 2015 to 2018 indicated that the high-BC area was located eastward of the low's center in relation to the ascending motion over the low's center and northward/eastward area. Since the area of the maximum ascending motion has a small horizontal scale, this was not well simulated by the 220-km experiment. The study identified that the BC transport to the Arctic in September is enhanced by the well-developed low-pressure systems. The results of the transport model indicate that the material transport processes to the Arctic by the well-developed low-pressure systems are enhanced in the fine horizontal resolution (similar to 56 km) models relative to the coarse horizontal resolution (similar to 220 km) models.
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