vertical profiles of black carbon measured by a micro-aethalometer in summer in the north china plain
Clicks: 153
ID: 250834
2016
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This
article has not been analysed, so there is no overall score —
reader engagement is measured and shown alongside.
Reader Engagement
Steady Performance
30.0
/100
153 views
48 readers
AI Quality Assessment
Not analyzed
Readership in this journal
SteadyRanked #422 of 850 articles by views in Journal of agricultural and food chemistry
Most read
Least read
Bar heights use a square-root scale. Only the 120 most-read articles are drawn; the journal has 850 in total.
Mint this article as an NFT
Not yet mintedCreate a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.
5
SUSD
one-off · no wallet required
Abstract
Black carbon (BC) is a dominant absorber in the visible spectrum and a potent
factor in climatic effects. Vertical profiles of BC were measured using a
micro-aethalometer attached to a tethered balloon during the Vertical
Observations of trace Gases and Aerosols (VOGA) field campaign, in summer
2014 at a semirural site in the North China Plain (NCP). The diurnal cycle of
BC vertical distributions following the evolution of the mixing
layer (ML) was investigated for the
first time in the NCP region. Statistical parameters including identified
mixing height (Hm) and average BC mass concentrations within the
ML (Cm) and in the free troposphere (Cf) were obtained for a selected dataset of
67 vertical profiles. Hm was usually lower than 0.2 km in the
early morning and rapidly rose thereafter due to strengthened turbulence. The
maximum height of the ML was reached in the late afternoon.
The top of a full developed ML exceeded 1 km on sunny days in summer, while
it stayed much lower on cloudy days. The sunset triggered the collapse of
the ML, and a stable nocturnal boundary layer (NBL) gradually formed.
Accordingly, the highest level Cm was found in the early morning
and the lowest was found in the afternoon. In the daytime, BC was almost
uniformly distributed within the ML and significantly decreased above the ML. During the field
campaign, Cm averaged about
5.16 ± 2.49 µg m−3, with a range of 1.12 to
14.49 µg m−3, comparable with observational results in many
polluted urban areas such as Milan in Italy and Shanghai in China. As evening
approached, BC gradually built up near the surface and exponentially declined
with height. In contrast to the large variability found both in Hm
and Cm, Cf stayed relatively unaffected through the day.
Cf was less than 10 % of the ground level under clean
conditions, while it amounted to half of the ground level in some polluted
cases. In situ measurements of BC vertical profiles would hopefully have an
important implication for accurately estimating direct radiative forcing by
BC and improving the retrieval of aerosol optical properties by remote
sensing in this region.
| Reference Key |
ran2016atmosphericvertical
Use this key to autocite in the manuscript while using
SciMatic Manuscript Manager or Thesis Manager
|
|---|---|
| Authors | ;L. Ran;Z. Deng;X. Xu;P. Yan;W. Lin;Y. Wang;P. Tian;P. Wang;W. Pan;D. Lu |
| Journal | Journal of agricultural and food chemistry |
| Year | 2016 |
| DOI |
10.5194/acp-16-10441-2016
|
| URL | |
| Keywords |
Citations
No citations found. To add a citation, contact the admin at info@scimatic.org
Comments
No comments yet. Be the first to comment on this article.