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| Titel |
Climatological perspectives of air transport from atmospheric boundary layer to tropopause layer over Asian monsoon regions during boreal summer inferred from Lagrangian approach |
| VerfasserIn |
B. Chen, X. D. Xu, S. Yang, T. L. Zhao |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 13 ; Nr. 12, no. 13 (2012-07-06), S.5827-5839 |
| Datensatznummer |
250011301
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| Publikation (Nr.) |
 copernicus.org/acp-12-5827-2012.pdf |
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| Zusammenfassung |
| The Asian Summer Monsoon (ASM) region has been recognized as a key region
that plays a vital role in troposphere-to-stratosphere transport (TST),
which can significant impact the budget of global atmospheric constituents
and climate change. However, the details of transport from the boundary
layer (BL) to tropopause layer (TL) over these regions, particularly from a
climatological perspective, remain an issue of uncertainty. In this study,
we present the climatological properties of BL-to-TL transport over the ASM
region during boreal summer season (June-July-August) from 2001 to 2009. A
comprehensive tracking analysis is conducted based on a large ensemble of
TST-trajectories departing from the atmospheric BL and arriving at TL.
Driven by the winds fields from NCEP/NCAR Global Forecast System, all the
TST-trajectories are selected from the high resolution datasets generated by
the Lagrangian particle transport model FLEXPART using a domain-filling
technique. Three key atmospheric boundary layer sources for BL-to-TL
transport are identified with their contributions: (i) 38% from the
region between tropical Western Pacific region and South China Seas
(WP) (ii) 21% from Bay of Bengal and South Asian subcontinent (BOB), and
(iii) 12% from the Tibetan Plateau, which includes the South Slope of the
Himalayas (TIB). Controlled by the different patterns of atmospheric
circulation, the air masses originated from these three source regions are
transported along the different tracks into the TL. The spatial
distributions of three source regions keep similarly from year to year. The
timescales of transport from BL to TL by the large-scale ascents r-range
from 1 to 7 weeks contributing up to 60–70% of the overall TST,
whereas the transport governed by the deep convection overshooting become
faster on a timescales of 1–2 days with the contributions of 20–30%.
These results provide clear policy implications for the control of very
short lived substances, especially for the source regions over Indian
subcontinent with increasing populations and developing industries. |
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