Large-scale vertical velocity, diabatic heating and drying profiles associated with seasonal and diurnal variations of convective systems observed in the GoAmazon2014/5 experiment
This study describes the characteristics of large-scale vertical velocity, apparent heating source (<i>Q</i><sub>1</sub>) and apparent moisture sink (<i>Q</i><sub>2</sub>) profiles associated with seasonal and diurnal variations of convective system...
| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2016-11-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://www.atmos-chem-phys.net/16/14249/2016/acp-16-14249-2016.pdf |
| Summary: | This study describes the characteristics of large-scale vertical velocity,
apparent heating source (<i>Q</i><sub>1</sub>) and apparent moisture sink
(<i>Q</i><sub>2</sub>) profiles associated with seasonal and diurnal variations
of convective systems observed during the two intensive operational periods
(IOPs) that were conducted from 15 February to 26 March 2014 (wet season) and
from 1 September to 10 October 2014 (dry season) near Manaus, Brazil, during
the Green Ocean Amazon (GoAmazon2014/5) experiment. The derived large-scale
fields have large diurnal variations according to convective activity in the
GoAmazon region and the morning profiles show distinct differences between
the dry and wet seasons. In the wet season, propagating convective systems
originating far from the GoAmazon region are often seen in the early morning,
while in the dry season they are rarely observed. Afternoon convective
systems due to solar heating are frequently seen in both seasons.
Accordingly, in the morning, there is strong upward motion and associated
heating and drying throughout the entire troposphere in the wet season, which
is limited to lower levels in the dry season. In the afternoon, both seasons
exhibit weak heating and strong moistening in the boundary layer related to
the vertical convergence of eddy fluxes. A set of case studies of three
typical types of convective systems occurring in Amazonia – i.e.,
locally occurring systems, coastal-occurring systems and basin-occurring
systems – is also conducted to investigate the variability of the
large-scale environment with different types of convective systems. |
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| ISSN: | 1680-7316 1680-7324 |