Tibetan Plateau Impacts on Global Dust Transport in the Upper TroposphereSource: Journal of Climate:;2018:;volume 031:;issue 012::page 4745DOI: 10.1175/JCLI-D-17-0313.1Publisher: American Meteorological Society
Abstract: Abstract Dust is a major component of atmospheric aerosol worldwide, greatly affecting regional and global climate. In this study dust aerosol optical depth (DAOD) and dust mass fluxes (DMF) were evaluated at different altitudes using measurements by the Cloud?Aerosol Lidar with Orthogonal Polarization (CALIOP) and ERA-Interim data from March through May (MAM) for the period 2007?16. Significantly higher upper-tropospheric (above ~8 km) dust loads and DMF downstream of the Tibetan Plateau (TP) relative to those over other major dust sources of the Northern Hemisphere were found during spring. A DMF magnitude of 1010 g integrated across a 2°-latitude segment during spring was estimated downstream of the TP in the upper troposphere. A dust belt can be clearly seen at altitudes higher than 6 km over the downwind direction of the TP at latitudes of around 30°?40°N, crossing the Pacific Ocean and extending to North America during spring. A pathway for transporting dust aerosols into the upper troposphere is proposed, as follows. Dust is uplifted to the midtroposphere over the source regions; then, frequent, deep, dry convection prevailing over the TP during spring can cause convective overshooting that uplifts the dust aerosols to the upper troposphere. The TP thus acts as a channel for transporting dust from the lower atmosphere to the upper troposphere, enabling the long-range zonal transport of dust around the Northern Hemisphere.
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contributor author | Xu, Chao | |
contributor author | Ma, Yaoming | |
contributor author | Yang, Kun | |
contributor author | You, Chao | |
date accessioned | 2019-09-19T10:08:57Z | |
date available | 2019-09-19T10:08:57Z | |
date copyright | 3/23/2018 12:00:00 AM | |
date issued | 2018 | |
identifier other | jcli-d-17-0313.1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4262083 | |
description abstract | Abstract Dust is a major component of atmospheric aerosol worldwide, greatly affecting regional and global climate. In this study dust aerosol optical depth (DAOD) and dust mass fluxes (DMF) were evaluated at different altitudes using measurements by the Cloud?Aerosol Lidar with Orthogonal Polarization (CALIOP) and ERA-Interim data from March through May (MAM) for the period 2007?16. Significantly higher upper-tropospheric (above ~8 km) dust loads and DMF downstream of the Tibetan Plateau (TP) relative to those over other major dust sources of the Northern Hemisphere were found during spring. A DMF magnitude of 1010 g integrated across a 2°-latitude segment during spring was estimated downstream of the TP in the upper troposphere. A dust belt can be clearly seen at altitudes higher than 6 km over the downwind direction of the TP at latitudes of around 30°?40°N, crossing the Pacific Ocean and extending to North America during spring. A pathway for transporting dust aerosols into the upper troposphere is proposed, as follows. Dust is uplifted to the midtroposphere over the source regions; then, frequent, deep, dry convection prevailing over the TP during spring can cause convective overshooting that uplifts the dust aerosols to the upper troposphere. The TP thus acts as a channel for transporting dust from the lower atmosphere to the upper troposphere, enabling the long-range zonal transport of dust around the Northern Hemisphere. | |
publisher | American Meteorological Society | |
title | Tibetan Plateau Impacts on Global Dust Transport in the Upper Troposphere | |
type | Journal Paper | |
journal volume | 31 | |
journal issue | 12 | |
journal title | Journal of Climate | |
identifier doi | 10.1175/JCLI-D-17-0313.1 | |
journal fristpage | 4745 | |
journal lastpage | 4756 | |
tree | Journal of Climate:;2018:;volume 031:;issue 012 | |
contenttype | Fulltext |